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DEPARTMENT OF THE INTERIOR HUBERT WORK, Secretary UNITED STATES GEOLOGICAL SURVEY GEORGE OTIS SMITH, Director WATER-SUPPLY PAPER 501
SURFACE WATER SUPPLY OP THE UNITED STATES 1919-1920 PART I. NOBTH ATLANTIC SLOPE DEAINAGE BASINS
NATHAN C. GROVER, Chief Hydraulic Engineer C. H. PIEBCE, C. C. COVERT, O. W. HARTWELL, and G. C. STEVENS, District Engineers
Prepared in cooperation with the States of MAINE. NEW HAMPSHIRE, VERMONT, MASSACHUSETTS, CONNECTICUT. NEW YORK, and PENNSYLVANIA
WASHINGTON GOVERNMENT FEINTING OFFICE
1923 DEPARTMENT OF THE INTERIOR HUBERT WORK, Secretary UNITED STATES GEOLOGICAL SURVEY GEORGE OTIS SMITH, Director
Water-Supply Paper 501
SURFACE WATER SUPPLY OF THE UNITED STATES 1919-1920
PART I, NOBTH ATLANTIC SLOPE DBAINAGE BASINS
NATHAN C. GROVER, Chief Hydraulic Engineer C. H. PIERCE, C. C. COVERT, O. W. HARTWELL, and G. C. STEVENS, District Engineers
Prepared in cooperation with the States of MAINE, NEW HAMPSHIRE, VERMONT, MASSACHUSETTS, CONNECTICUT, NEW YORK, and PENNSYLVANIA
WASHINGTON GOVERNMENT PRINTING OFFICE
1923 ADDITIONAL COPIES OF THIS PUBLICATION MAY BE PROCURED FROM THE SUPERINTENDENT OF DOCUMENTS GOVERNMENT PRINTING OFFICE WASHINGTON, D. C. AT 30 CENTS PER COPY
PURCHASER AGREES NOT TO RESELL OR DISTRIBUTE THIS COPY FOR PROFIT. PUB. RES. 57, APPROVED MAY 11, 1922 CONTENTS.
Page. Authorization and scope of work...... 7 Definition of terms...... 8 Explanation of data...... 9 Accuracy of field data and computed results...... 10 Cooperation...... 11 Division of work...... 12 Gaging-station records...... 13 St. John Elver basin...... I 13 St. John River at Van Buren, Maine...... 13 St. Croix Eiver basin...... 15 St. Croix River near Baileyville, Maine...... 15 Machias River basin...... ^.. f ...... 17 Machias River at Whitneyville, Maine...... 17 Union River basin...... 19 West Branch of Union River at Amherst, Maine...... 19 Penobscot River basin...... 21 West Branch of Penobscot River at Millinocket, Maine...... 21 West Branch of Pendbscot River near Medway, Maine...... 22 Penobscot River at West Enfield, Maine...... 24 East Branch of Penobscot River at Grindstone, Maine...... 28 Mattawamkeag River at Mattawamkeag, Maine...... 30 Piscataquis River near Foxcroft, Maine...... 33 Pleasant Biver at Milo, Maine...... 35 Passadumkeag River at Lowell, Maine...... 37 Kenduskeag Stream near Bangor, Maine...... 30 Kennebec River,basin...... 41 Moose River near Rockwood, Maine...... 41 Moosehead Lake at east outlet, Maine.*...... 43 Kennebec River at Moosehead, Maine...... 44 Kennebec River at The Forks, Maine...... 46 Kennebec River at Waterville, Maine...... 48 Dead River at The Forks, Maine...... 50 Androscoggin River basin...... 53 Androscoggin River at Errol dam, N. H...... 53 Androscoggin River at Berlin, N. H...... 55 Androscoggin River at Rumf ord, Maine...... 57 Magalloway River at Aziscohos dam, Maine...... 59 Little Androscoggin River near South Paris, Maine... 1...... 60 Presumpscot River basin...... 62 Presumpscot River at outlet of Sebago Lake, Maine."... ^...... 62 Saco River basin ...... /...... 64 Saco River at Cornish, Maine...... 64 Saco River at West Buxton, Maine...... 1...... 67 Oasipee River at Cornish, Maine...... 69 3 4 CONTENTS. «
Gaging-etation records Continued. Page. Merrimack River basin...... 72 Pemigewasset River at Plymouth, N. H...... 72 Merrimack River at Franklin Junction, N. H...... 75 Merrimack River at Lawrence, Mass...... 77 Smith River near Bristol, N. H...... 81 Contoocook River near Elmwood, N. H...... 84 Blackwater River near Contoocook, N. H...... 86 Suncook River at North Chichester, N. H...... 89 Souhegan River at Merrimack, N, H...... 91 South Branch of Nashua River near Clinton, Mass...... 93 Sudbury River and Lake Cochituate basins near Framingham and Cochituate, Mass...... 94 Taunton River basin...... 96 Taunton River at Titicut, near Bridgewater, Mass...... 96 Palwtuxet River basin...... 98 Pawtuxet River at Fiskeville, R. I...... 98 Thames River basin...... 102 Quinnebaug River at Jewett City, Conn...... 102 Shetucket River at South Windham, Conn...... 104 Connecticut River basin...... 106 First Connecticut Lake near Pittsburg, N. H...... 106 Connecticut River at First Connecticut Lake, near Pittsburg, N. W. . 108 Connecticut River at Orford, N. H...... Ill Connecticut River at Sunderland, Mass...... 114 Passumpsic River at Pierce's mills, near St. J^tnsbury, Vt...... 116 White River at West Hartford, Vt...... 118 West River at Newfane, Vt...... 121 Ashuelot River at Hinsdale, N. H...... 123 Minnewawa Brook at Marlboro, N. H...... 125 Pratt Brook at Chesham, N. H...... 127 Millers River near Winchendon, Mass...... 129 Millers River at Erving, Mass...... 132 Sip Pond Brook near Winchendon, Mass...... 134 Priest Brook near Winchendon, Mass...... 137 East Branch of Tully River near Athol, Mass...... 139 Moss Brook at Wendell Depot, Mass...... 142 Deerfield River at Charlemont, Mass....'...... 145 Ware River at Gibbs Crossing, Mass...... 147 Swift River at West Ware, Mass...... 150 Quaboag River at West Brimfield, Mass...... 153 Westfield River at Knightville, Mass...... 155 Westfield River near Westfield, Mass...... 158 Middle Branch of Westfield River at Goss Heights, Mass...... 160 Westfield Little River near Westfield, Mass...... 163 Farmington River at New Boston, Mass...... 166 Hockanum River near East Hartford, Conn...... 168 Housatonic River basin...... )...... ,...... 170 Housatonic River near Great Barrington, Mass...... 170 Housatonic River at'Falls Village, Conn...... t...... 172 Naugatuck River near Naugatuck, Conn...... 175 Mianus River basin...... 177 Mianus River at North Mianus, Conn...... 177 CONTENTS. 5
Gaging-station records Continued. Page: Hudson River basin...... 179 Hudson River at Gooley, near Indian Lake, N. Y...... 179 Hudson River at North Creek, N. Y...... : 182 Hudson River at Thurman, N. Y...... 185 Hudson River at Spier Falls, N. Y...... 188 Hudson River at Mechanicville, N. Y...... 190 Indian Lake reservoir at Indian Lake, N. Y...... 192 Indian River near Indian Lake, N. Y...... "...... 195 Schroon River at Riverbank, N. Y...... 198 - Sacandaga River near Hope, N. Y...... 201 Sacandaga River at Hadley, ft. Y...... 203 Hoosic River near Eagle Bridge, N. Y...... 206 Mohawk River at Vischer Ferry dam, N. Y...... 208 Mohawk River at Crescent dam, N. Y...... 210 West Canada Creek at Hinckley, N. Y...... 212 Ninemile feeder near Holland Patent, N. Y ...... 215 Wallkill River at Pellets Island Mountain, N. Y...... 216 Delaware River basin...... 218 East Branch of Delaware River at Fish Eddy, N. Y...... 218 Delaware River at Port Jervis, N. Y...... 220 Delaware River at Riegelsville, N. J...... 223 Beaver Kill at Cooks Falls, N. Y...... 225 West Branch of Delaware River at Hale Eddy, N. Y...... 228 Wallenpaupack Creek at Wilsonville, Pa...... 231 Lehigh River at Tannery, Pa...... 233 Lehigh River at Bethlehem, Pa...... 235 Little Schuylkill River at Tamaqua, Pa...... 237 Schuylkill River at Reading, Pa...... 239 Brandywine Creek at Chadds Ford, Pa...... 241 Susquehanna River basin...... 243 Susquehanna River at Conklin, N. Y...... 243 Susquehanna River at Towanda, Pa...... 246 Susquehanna River at Wilkes-Barre, Pa...... 249 Susquehanna River at Danville, Pa...... 251 Susquehanna River at Harrisburg, Pa...... ; 254 Chenango River near Chenango Forks, N, Y...... 256 Tioga River near Erwins, N. Y...... 259 Chemung River at Chemung, N. Y...... 261 Cohocton River near Savona, N. Y...... 264 Cohocton River near Campbell, N. Y...... 265 Mud Creek at Savona, N. Y...... 268 Tunkhannock Creek at Dixon, Pa...... 271 Lackawanna River at Moosic; Pa...... 273 Wapwallopen Creek near Wapwallopen, Pa...... 275 Nescopeck Creek near St. John, Pa...... 276 Fishing Creek at Bloomsburg, Pa...... 278 West Branch of Susquehanna River at Bower, Pa...... 280 West Branch of Susquehanna River at Renovo, Pa...... 282 West Branch of Susquehanna River at Williamsport, Pa...... 284 Clearfield Creek at Dimeling, Pa...... 286 Driftwood Branch of Sinnemahoning Creek at Sterling Run, Pa...... 289 Bald Eagle Creek at Milesburg, Pa...... 291 6 CONTENTS.
Gaging-station records Continued. Susquehanna River basin Continued. Page. Bald Eagle Creek at Beech Creek station, Pa...... 294 Pine Creek at Cedar Run, Pa...... 296 Pine Creek near Waterville, Pa...... 298 Lycoming Creek near Trout Run, Pa...... 300 Juniata River at Newport, Pa...... 302 Frankstown Branch of Juniata River at Williamsburg, Pa...... 304 Raystown Branch of Juniata River at Saxton, Pa...... 306 Tuscarora Creek near Port Royal, Pa...... 308 Yellow Breeches Creek at Olmsted's Mill, Pa...... 311 Swatara Creek at Harpers, Pa...... 312 Little Swatara Creek near Pine Grove, Pa...... 314 Patuxent River basin...... 316 Patuxent River near Burtonsville, Md...... 316 Potomac River basin...... 318 Potomac River at Point of Rocks, Md...... 318 Monocacy River near Frederick, Md...... 321 Rappahannock River basin...... 323 Rappahannock River near Fredericksburg, Va...... 323 Miscellaneous discharge measurements...... 326 Index...... 327
ILLUSTRATIONS.
Page. PLATE I. A, Price current meters; B, Typical gaging station...... 8 II. Water-stage recorders; A, Stevens continuous; B, Gurley printing; C, Friez...... 9 SURFACE WATER SUPPLY OF THE NORTH ATLANTIC SLOPE DRAINAGE BASINS, 1919-1920.
AUTHORIZATION AND SCOPE OF WORK. This volume is one of a series of 14 reports presenting results of measurements of flow made on streams in the United States during the years ending September 30, 1919 and 1920. The data presented in these reports were collected by the United States Geological Survey under the following authority contained in the organic law (20 Stat. L., p. 394); Provided, That this officer [the Director] shall have the direction of the Geological Survey and the classification of public lands and examination of the geological struc ture, mineral resources, and products of the national domain. The work was begun in 1888 in connection with special studies relating to irrigation in the arid West. Since the fiscal year ending June 30, 1895, successive sundry civil bills passed by Congress have carried the following item and appropriations: For gaging the streams and determining the water supply of the United States, and for the investigation of underground currents and artesian wells, and for the prepara tion of reports upon the best methods of utilizing the water resources. Annual appropriations for the fiscal years ending June 30, 1895-1921. 1895...... $12,500.00 1896...... 20,000.00 1897 to 1900, inclusive...... 50, 000.00 1901 to 1902, inclusive...... 100,000. 00 1903 to 1906, inclusive...... 200, 000.00 1907...... 150,000.00 1908 to 1910, inclusive...... 100, 000. 00 1911 to 1917, inclusive...... 150,000. 00 1918...... 175,000.00 1919...... 148, 244.10 1920...... 175,000.00 1921...... 180, 000.00 In the execution of the work many private and State organizations have cooperated, either by furnishing data or by assisting in collecting data. Acknowledgments for cooperation of the first kind are made in connection with the description of each station affected; coopera tion of the second kind is acknowledged on pages 11 and 12. Measurements of stream flow have been made at about 5,000 points in the United States and also at many points in Alaska and the 7 8 SURFACE WATER SUPPLY, 1919-1920, PART I. Hawaiian Islands. In July, 1920, 1,350 gaging stations were being maintained by the Survey and the cooperating organizations. Many miscellaneous discharge measurements are made at other points. In connection with this work data were also collected in regard to prer cipitation, evaporation, storage reservoirs, river profiles, and water power in many sections of the country and will be made available in water-supply papers from time to time. DEFINITION OF TEBMS. The volume of water flowing in a stream the "run-off" or "dis charge" is expressed in various terms, each of which has become associated with a certain class of work. These terms may be divided into two groups (1) those that represent a rate of flow, as second- feet, gallons per minute, miners' inches, and discharge in second feet per square mile, and (2) those that represent the actual quantity of water, as run-off in inches, acre-feet, and millions of cubic feet. The principal terms used in this series of reports are second-feet, second-feet per square mile, run-off in inches, and acre-feet. They may be defined as follows: "Second-feet" is an abbreviation for "cubic feet per second." A second-foot is the rate of discharge of water flowing in a channel of rectangular cross section 1 foot wide and 1 foot deep at an average velocity of 1 foot per second. It is generally used as a fundamental unit.from which others are computed. "Second-feet per square mile" is the average number of cubic feet of water flowing per second from each square mile of area drained, on the assumption that the run-off is distributed, uniformly both as regards time and area. " Run-off in inches" is the depth to which an area would be covered if all the water flowing from it in a given period were uniformly distributed on the surface. It is used for comparing run-off with rainfall, which is usually expressed in inches. An "acre-foot," equivalent to 43,560 cubic feet, is the quantity required to cover an acre to the depth of 1 foot. The term is com monly used in connection with storage for irrigation. The following terms not in common use are here defined: "Stage-discharge relation;" an abbreviation for the term "relation of gage height to discharge." "Control;" a term used to designate the section or sections of the stream below the gage which determine the stage-discharge relation at the gage. It should be noted that the control may not be the same section or sections at all stages. The "point of zero flow" for a gaging station is that point on the gage the gage height to which the surface of the stream would fall if there were no flow. U. S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER 501 PLATE I
. PKICli CURRENT METERS.
B. TYPICAL GAGING STATION. U. S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER 501. PLATE II
i
A. STEVENS CONTINUOUS. B. GURLEY PRINTING. C. FRIEZ. WATER-STAGE RECORDERS. SURFACE WATER SUPPLY, 1919-1920, PART I. 9
EXPLANATION OF DATA. The data presented in this report cover the two years, beginning October 1, 1918, and ending September 30, 1920. At the beginning of January in most parts of the United States much of the precipita tion in the preceding three months is stored as ground water, in the form of snow or ice, or in ponds, lakes, and swamps, and this stored water passes off in the streams during the spring break-up. At the end of September, on the other hand, the only stored water available for run-off is possibly a small quantity in the ground; therefore the run-off for the year beginning October 1 is practically all derived from precipitation within that year. The base data collected at gaging stations consist of records of stage, measurements of discharge, and general information used to supplemengb the gage heights and discharge measurements in deter mining the daily flow. The records of stage are obtained either from direct readings on a ataff or chain gage or from a water-stage recorder that gives a continuous record of the fluctuations. Measure ments of discharge are made with a current meter. (See Pis. I, II.) The general methods are outlined in standard textbooks on the measurement of river discharge. From the discharge measurements rating tables are prepared that give the discharge for any stage, and these rating tables, when applied to the gage heights, give the discharge from which the daily, monthly, and yearly mean discharge is determined. The data presented for each gaging station in the area covered by this report comprise a description of the station, a table giving results of discharge measurements, a tal)le showing the daily discharge of the stream, and a table of monthly and yearly discharge and run-off. If the base data are insufficient to determine the daily discharge, tables giving daily gage heights and results of discharge measure ments are published. The description of the station gives, in addition to statements regarding location and equipment, information in regard to any con ditions that may affect the constancy of the stage-discharge relation, covering such subjects as the occurrence of ice, the use of the stream for log driving, shifting of control, and the cause and effect of back water; it gives also information as to diversions that decrease the flow at the gage, artificial regulation, maximum and minimum recorded stages, and the accuracy of the records. The table of daily discharge gives, in general, the discharge in second-feet corresponding to the mean of the gage heights read each day. At stations on streams subject to sudden or rapid diurnal fluctuations the discharge obtained from the rating table and the mean daily gage height may not be the true mean discharge for the day. 10 SURFACE WATER SUPPLY, 1919-1920, PART I.
If such stations are equipped with water-stage recorders the mean daily discharge may be obtained by averaging discharge at regular intervals during the day or by using the discharge integrator, an instrument operating on the principle of the planimeter and contain ing as an essential element the rating curve of the station. In the table of monthly discharge the column headed "Maximum" gives the mean flow for the day when the mean gage height was highest. As the gage height is the mean for the day it does not indicate correctly the stage when the water surface was at crest height and the corresponding discharge was consequently larger than given in the maximum column. Likewise, in the column headed "Minimum" the quantity given is the mean flow for the day when the mean gage height was lowest. The column headed " Mean " is the average flow in cubic feet for each second during the month. On this average flow computations recorded in the remaining columns, which are denned on page 8, are based. ACCURACY OP FIELD DATA AND COMPUTED RESULTS. The accuracy of stream-flow data depends primarily (1) on the permanence of the stage-discharge relation and (2) on the accuracy of observation of stage, measurements of flow, and interpretation of records. A paragraph in the description of the station or footnotes added to the tables gives information regarding (1) the permanence of the stage-discharge relation, (2) precision with which the discharge rating curve is defined, (3) refinement of gage readings, (4) frequency of gage readings, and (5) methods of*applying daily gage heights to the rating table to obtain the daily discharge.1 For the rating tables "well defined" indicates, in general, that the rating is probably accurate within 5 per cent; "fairly well defined," within 10 per cent; "poorly defined," within 15 to 25 per cent. These notes are very general and are based on the plotting of the individual measurements with reference to the mean rating curve. The monthly means for any station may represent with high accu racy the quantity of water flowing past the gage, but the figures showing discharge per square mile and depth of run-off in inches may be subject to gross errors caused by the inclusion of large non- contributing districts in the measured .drainage area, by lack of information concerning water diverted for irrigation or other use, or by inability to interpret the effect of artificial regulation of the flow of the river above the station. "Second-feet per square mile" and "Run-off in inches" are therefore not computed if such errors appear probable. The computations are also omitted for
1 For a more detailed discussion of the accuracy of stream-flow data see Grover, N. C., and Hoyt, J. C., Accuracy of stream-flow data: U. S. Geol. Survey Water-Supply Paper 400, pp. 53-59,1916. COOPERATION. 11 stations on streams draining areas in which the annual rainfall is less than 20 inches. All figures representing "second-feet per square mile" and "run-off in inches" published by the Survey in the early reports should be used with caution because of possible inherent sources of error not known to the Survey. Many gaging stations on streams in the irrigated sections of the United States are located above most of the diversions from those streams, and the discharge recorded does not show the water supply available for further development as prior appropriations below the stations must first be satisfied. To give an idea of the amount of prior appropriations, a paragraph on diversions is presented in each station description. Where values are given these can not be con sidered exact but as being the best information available. The table of monthly discharge gives only a general idea of the flow at the station and should not be used for other than preliminary estimates; the tables of daily discharge allow more detailed studies of the variation in flow. It should be borne in mind, however, that the observations in each succeeding year may be expected to throw new light on data previously published. v COOPERATION. The hydrometric work in Maine was carried on until August 1, 1919, in cooperation with the Public Utilities Commission, Benjamin F. Cleaves, chairman, and Paul L. Bean, chief engineer, and after August 1, 1919, in cooperation with the Maine Water Power Commis sion, Edward P. Ricker, chairman, and George C. Danforth, chief engineer. The work in New Hampshire was done in cooperation with the Com mission on Water Conservation and Water Power, George B. Leighton, commissioner. The work in Vermont was carried on in cooperation with the State, Percival W. Clement, governor, and Herbert M. Mclntosh, State engineer. The work in Massachusetts was carried on hi cooperation with the Department of Public Works, 'John N. Cole, commissioner. The work in Connecticut was carried on in cooperation with the Bureau of Sanitary Engineering of the State Department of Health, J. Frederick Jackson, director and chief engineer. The work in New York has been conducted under cooperative agreements with Frank M. Williams, State engineer and surveyor, and since July 1, 1911, with the Division of Waters of the State Con servation Commission, George D. Pratt, commissioner. The work in Pennsylvania was carried on in cooperation with the Water Supply Commission of Pennsylvania, Thomas- J. Lynch, secretary. 12 SURFACE WATER SUPPLY, 1919-1920, PART I. Financial assistance has been rendered by the St. Croix Pulp & Paper Co., the Central Maine Power Co., the Cumberland County Power & Light Co., the New England Power Co., the Turners Falls Power & Electric Co., the Connecticut Valley Lumber Co., the Holyoke Water Power Co., the International Paper Co., the Connecticut Power Co., the Eastern Connecticut Power Co., the W. H. McElwain Co.; the Keene Gas & Electric Co., the Profile Falls Power Co., the New York, New Haven & Hartford Railroad, the Adirondack Electric Power Corporation, the Indian River Co., M. O. Leighton, the J. G. White Engineering Corporation, and the Spottsylvania Power Co.
DIVISION OF WORK. The data for stations in New England were collected and prepared for publication under the direction of C. H. Pierce, district engineer. A. F. McAlary, assistant engineer of the Public Utilities Commission, had immediate supervision of the work in Maine until August 1, 1919. After the organization of the Maine Water Power Commission, J. W. Moulton was in local charge of field work in Maine, with head quarters at the office of the Maine Water Power Commission. The other assistants in New England were H. W. Fear, R. H. Suttie, M. R. Stackpole, B. L. Bigwood, Hope Hearn, H. S. Price, Lillian H. McCarthy, J. L. Lamson, K. K. Hoyt, E. E. R. Dornbaeh, and W. E. Armstrong. Data for stations in New York were collected and prepared for pub lication under the direction of C. C. Covert, district engineer, who was assisted by O. W. Hartwell, Max H. Carson, B. J. Peterson, A. H. Davison, Arthur W. Harrington, Otto Lauterhahn, B. F. Howe, E. B. Shape, S. M. Currier, and V. B. Lamoureux. Data for stations in Pennsylvania were collected and prepared for publication under the direction of O. W. Hartwell, district engineer, who was assisted by B. J. Peterson and engineers of the State Water Supply Commission as follows: R. A. Boehringer, R. H. Hosmer, R. J. Ferris, H. L. Landis, J. M. Snavely, and B. J. Lichty. Data for stations in New Jersey, Maryland, and .Virginia were col lected and prepared for publication -under the direction of G. C. Stevens, district engineer, who was assisted by B. J. Peterson, E. L. Williams, B. L. Bigwood, J. J. Dirzulaitis, V. B. Lamoureux, J. S. S. Jones, and K. K. Hoyt. The manuscript was assembled and reviewed by B. L. Bigwood, M. I. Walters, J. J. Dirzulaitis, B. J. Peterson, and G. C. Stevens. SURFACE WATER SUPPLY, 191&-1920, PART I. 13
GAGING-STATION BECOBDS. ST. JOHN BIVEB BASIN. ST. JOHN RIVER AT VAN BTTREN, MAINE. LOCATION. At international bridge at Van Buren, Aroostook County, 14 miles above Grand Falls. DRAINAGE AKEA. 8,270 square miles. RECORDS AVAILABLE. May 4, 1908, to September 30, 1920. GAGE. Gage used since May 6, 1912, painted vertically on second pier from Yan Buren end of bridge; zero of gage, 407.69 feet above sea level; daily gage heights 1908 to 1911 read on a vertical rod attached to pier of sawdust carrier of Ham- mond's mill, about 700 feet below international bridge, but as published they are reduced to* the datum of the bridge gage. Gage read by W. H. Scott. DISCHARGE MEASUREMENTS. Made from international bridge. CHANNEL AND CONTROL. Control practically permanent, banks high, rocky, cleared, and not subject to overflow except at very high stages. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 24.2 feet at 7.30 a. m. May 20 (discharge 102,000 second-feet); minimum stage recorded, 1.75 feet at 7.20 a. m. September 1 (discharge, 2,280 second-feet). Maximum stage recorded for the year ending September 30, 1920, 24.6 feet at 7 a. m. May 11 (discharge, 104,000 second-feet); minimum stage recorded, 2.0 feet at 7.35 a. m. October 6; minimum discharge, 1,050 second-feet occurred March 3, 9, 10, and 11 (stage-discharge relation affected by ice). 1908-1920: Maximum discharge, 121,000 second-feet 3 May 13,1909, and May 3-4, 1911; minimum open-water discharge, 1,250 second-feet October 3, 1910; discharge estimated at 875 second-feet December 19-22, 1910; stage-discharge relation affected by ice at the time. ICE. Stage-discharge relation seriously affected by ice, usually from December to April of each year. A gage-height record obtained at Grand Falls by H. S. Ferguson, consulting engineer, is used in estimating the winter flow at Van Buren. REGULATION. The little storage which is used for log driving probably does not seriously affect the natural flow. ACCURACY. Stage-discharge relation practically permanent except when affected " by ice. Rating curve well defined. Gage read to half-tenths once daily. Daily discharge ascertained by applying rating table to daily gage height with correc tions for effect of ice during the winter. Records good. Discharge measurements of St. John River at Van Buren, Maine, during the year ending Sept. 30, 19ZO. [Made by J. W. Moulton.]
Gage Dis Date. height. charge.
Feet. Sec.-ft. /an. 29...... 02.48 1,370 Mar. 17...... «3.74 1,800
o Stage-discharge relation affected by ice. 8 Based on revised ratingcurve and supersedes figures published in previous water-supply papers. 14 SURFACE WATER SUPPLY, 1919^-1920, PART I.
Daily discharge, in second-feet, of St. John River at Van Buren, Maine, for the years ending Sept. 30, 1919 and 1920.
Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept.
1918- 19. 1.... 20,800 15,400 7,390 9,790 4,240 3,120 15,800 78,600 32,300 7,000 12,700 2,280 2.... 18,200 22,600 6,320 9,120 4,160 3,050 18,300 86,200 27,400 6,520 12,200 2,700 3.... 16,000 25,100 6,190 8,790 4,070 3.120 17,400 94,000, 25,100 6,050 10,600 3,150 4.... 13,000 24,700 6,190 8,630 3,990 3,120 16,600 100,000 26,600 5,820 8,470 3,640 5.... 10,800 21,200 6,440 7,990 3,990 3,120 15,000 100,000 24,400 5,820 7,480 3,640 6.... 10,800 19,200 6,570 7,540 3,900 3,050 14,500 101,000 21,800 4,920 6,520 3,250 7.... 10,800 17,600 6,970 7,250 3,900 2.910 14,500 99,200 20,800 4,260 5,820 3,060 8.... 11,400 15,700 6,190 6,830 ,3,820 2,840 17,700 94,000 20,800 3,840 5,360 2,360 9.... 11,100 12,200 5,610 6,700 3,820 2,770 18,300 87,500 19,200 4,260 5,140 3,060 10.... 11,900 11,400 5,720 6,830 3,820 2,770 18,800 84,200 18,800 3,840 4,700 3,060 11.... 13,300 11,400 5,830 6,440 3,740 2,700 20,000 81,000 17,900 " 3,640 4,700 3,250 12.... 14,800 12,800 5,610 5,950 3,740 2,840 23.500 85,600 16,600 3,640 4,920 4,050 13.... 15,700 10,600 5^830 5,610 3,740 2,770 26,700 78,000 15,400 4,700 4,700 7,000 14.... 15,700 9,760 5,950 5,390 3,660 3,050 35,800 81,000 13,900 4,700 4,260 11,900 15.... 14,800 9,500 6,070 5,190 3,580 2,980 50,300 84,200 14,200 4,050 4,050 12,500 16.... 13,900 9,500 7,110 5,090 3,500 2,640 55,000 83,600 14,800 3,840 3,840 11,900 17.... 12,200 9,500 7,990 4,990 3,350 2,580 45,500 78,000 14,200 4,260 3,840 10,300 18.... 11,600 9,500 7,840 4,890 3,270 2,700 44,500 79,200 15,100 4,920 4,050 8,220 19.... 10,000 9,240 7,690 4,790 3,270 3,200 44,500 86,800 15,100 7,000 4,700 7,000 20.... 9,500 11,600 8,960 4,700 3,200 3,500 45,500 100,000 12,800 6,050 4,050 6,760 21.... 9,760 17,200 9,450 4,600 3,270 3,900 42,500 90,800 11,600 5,360 3,840 5,820 22.... 9,500 19,200 9,120 4,600 3,200 4,700 43,000 75,600 10,300 5,140 3,840 5,250 23.... 8,980 18,200 8,960 4,510 3,120 5,290 44,500 66,600 9,240 4,700 3,640 5,140 24.... 8,720 17,200 9,620 4,420 3,120 6,570 50,500 61,900 8,220 4,700 3,440 4,700 25.... 8,720 16,300 9,960 4,600 3,050 7,390 60,200 63,000 7,720 5,140 2,700 4,700 26.... 8,470 13,500 9,790 4,510 3,050 8,150 77,400 64,800 6,760 5,590 3,250 4,920 27.... 8,220 12,500 10,500 4,330 3,120 9,450 83,000 59,700 7,000 5,590 2,880 5,140 28.... 7,720 8,310 11,400 4,420 3,120 10,300 78,600 55,000 8,220 6,050 2,790 5,140 29.... 7,480 3,960 11,600 4,330 11,600 73,200 49,500 7,970 9,500 2,880 4,920 30.... 8,980 7,690 11,400 4,330 13,500 72,000 43,500 "7,480 15,100 2,790 4,700 31 11,600 10,500 4,240 14,700 39,100 13,900 2,700 1919- 20. 1.... 4,480 6,050 7,000 2.700 1,250 1.200 19,000 48,000 24,700 11,600 9,240 5,360 2.... 4,050 6,050 6' 000 2:400 1,250 1,100 18,000 51,000 22,600 18,200 8,720 6,520 3.... 3,640 6,050 4,400 2,200 1,250 1,050 18,000 52,500 21,500 22,200 6,280 7,970 4.... 3,250 8,220 5,000 2,200 1,250 1,100 18,000 51,000 23,300 18,500 6,280 9,500 5.... 3,060 8,980 5,600 2,100 1,200 1,100 19,000 47,500 23,600 17,900 7,000 8,720 6.... 2,700 8,720 5,000 2,200 1,200 1,100 22,000 45,000 22,600 19,800 7,240 7,720 7.... 3,640 7,240 5,200 2,300 1,200 1,100 23,000 43,500 21,800 22,600 7,480 7,240 8.... 3,840 6,520 5,000 2,200 1,200 1,100 22,000 46,500 23 300 24,060 7,000 7 240 9.... 4,050 5,820 4,700 2,200 1,200 1,050 23.000 61,900 25,100 27,000 5,820 V60 10.... 4,700 5,590 5,000 2,100 1,200 1,050 23,000 92,700 25,900 25,900 5,140 9,500 11.... 7,000 5,590 4.300 2,100 1,200 1,050 23,000 104,000 25,900 24,700 5,360 10,600 12.... 6,280 5,590 3,900 2,000 1,200 1,100 23,000 95,300 25,100 22,200 5,360 10,600 13.... 6,050 5,360 4,000 2,000 1,200 1,200 28,000 83,600 22,600 19,500 5,140 10,800 14.... 8,220 5,820 4,300 1,900 1,250 1,350 30,000 72,600 20,200 16,000 4,920 13,300 15.... 7,720 6,760 4,000 1,900 1,200 1,550 36,000 64,800 17,200 13,000 7,000 15,100 16.... 5,820 9,760 4,200 1,900 1,200 1,700 37,000 60,800 17,200 12,800 6,520 15,700 17.... 6,050 10,000 4,300 1,800 1,200 1,800 38,000 59,700 16,600 12,200 9,240 14,800 18.... 5,590 8.720 4,000 1,800 1,250 1,800 40,000 59,200 14,800 10,800 9,240 15,100 19.... 5,690 8,470 3,500 1,750 1,200 1,800 41,000 61,900 12,200 10,300 8,220 16,600 20.... 5,360 7,480 3,400 1,700 1,200 1,850 43,500 61,900 11,400 10,300 7,000 16,900 21.... 5,590 6,600 3,300 1,700 1,200 1,750 46,500 61,400 10,600 10,800 5,590 16,000 22.... 5,590 5,200 2,900 1,700 1,200 1.750 51,500 57,500 10,000 14,200 5,140 14,200 23.... 5,360 6,200 3,000 1,650 1,200 1,950 57,500 53,000 9,500 15,100 6,050 12,200 24.... 5,140 7,400 2,900 1,600 1,200 2,100 60,200 49,500 10000 13,600 10,600 10,800 25.... 5,140 8,000 2,900 1,500 1,150 2,450 59,700 45,000 10,600 12,200 12,800 9,500 26.... 5,590 6,400 2,700 1,500 1,150 4,000 56,000 41,'500 11,400 11,600 12,800 8,220 27.... 5,360 5,400 2,800 1,500 1,100 5,600 49,500 37700 10,600 10,800 10,800 7,480 28.... 5,360 6,600 2,700 1,400 1,150 12.000 42,500 34100 9,760 9,500 8,720 7,000 29.... 5,360 6,400 2,900 1,400 1,100 13,000 45,000 31,100 8,720 8,470 6,520 6,520 30.... 5,590 7,000 2,700 1,400 15,000 46,500 29,000 8,720 7,480 5,820 6,050 31 5,820 i,9 S7UUQftn 1 ' 400 20,000 27,000 8,470 5,590
NOTE. Stage-discharge relation affected by ice Nov. 26, 1918 to Apr. 15, 1919; discharge for this period based on gage heights at Grand Falls. Stage-discharge relation affected by ice Nov. 21,1919, to Apr. 19,1920. Discharge determined from gage heights corrected for effect of ice by two discharge measurements, observer's notes, and comparison with records at Grand Falls. ST. CEOIX BIVEK BASIN. 15
Monthly discharge of St. John Rwer at Van Buren, Maine, for the years ending Sept. 30, 1919 and 1920. [Drainage area, 8,270 square miles.}
Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 20,800 7,480 11,800 1.43 1.65 25,100 7,690 14,300 1.73 1.93 11,600 5,610 7,900 .955 1.10 9,790 4,240 5,850 .707 .82 4,240 3,050 3,560 .430 .45 14,700 2,580 4,980 .602 .69 83,000 14,500 39,400 4.76 5.31 May...... 101,000 39,100 78,400 9.48 10.93 32,300 6,760 15,700 1.90 2.12 July...... 15,100 3,640 5,800 .701 .81 12,700 2,790 5,060 .612 .71 12,500 2,280 5,450 .659 .74 101,000 2,280 16,600 2.01 27.26 1919-20. October..*:...... 8,220 2,700 5,190 .628 .72 10,000 5,200 6,930 .838 .94 7,000 2,700 4,020 .486 .58 2,700 1,400 1,880 .227 .26 1,250 1,100 1,200 .145 .16 20,000 1,050 3,410 .412 .48 60,200 18,000, 35,300 4.27 4.76 May 104,000 27,000 55,800 6.75 7.78 25,900 8,720 17,200 2.08 2.32 July...... 27,000 7,480 15,500 1.87 2.16 12,800 4,920 7,380 .893 1.03 16,900 5,360 10,600 1.28 1.43 104,000 1,050 13,700 1.66 22.60
ST. CROIX RIVER BASIN. ST. CROIX RIVER NEAR BAILEYVILLE, MAINE. LOCATION. A short distance below power house of St. Croix Paper Co. at Grand Falls, Baileyville Township, 3J miles east of Baileyville station of Maine Central Railroad, Washington County. DRAINAGE AREA. 1,320 square miles (measured on map compiled by Maine Water Power Commission). RECORDS AVAILABLE. November 25, 1919, to September 30, 1920. GAGE. Gurley 7-day water-stage recorder on right bank referenced to gage datum by a hook gage inside the well; an inclined staff is used for auxiliary readings. Recorder inspected by H. S. James. DISCHARGE MEASUREMENTS. Made from cable about 300 feet below gage. CHANNEL AND CONTROL. Bed covered with gravel and boulders; control for low and medium stages formed by series of riffles near the gage; control for high stages not clearly defined. EXTREMES OF DISCHARGE. Maximum stage recorded during period of record, 8.74 feet at noon April 15 (discharge from extension of rating curve, 13,900 second- feet); minimum stage recorded during period of record, 1.48 feet at 8 a. m. Feb ruary 22 (discharge from extension of rating curve, 380 second-feet). ICE. River remains open throughout the winter. REGULATION. Variations in use of water at the power plant a short distance above the gage cause some fluctuation in stage. ACCURACY. Stage-discharge relation apparently permanent. Rating curve fairly well defined between 1,000 and 10,000 second-feet. Operation of water-stage recorder satisfactory. Daily discharge ascertained by applying rating table to mean daily gage height and by use of discharge integrator. Records good. 16 SURFACE WATER SUPPLY, 1919-1920, PART I.
Discharge measurements of St. Croix River near Baileyville, Maine, during the year ending Sept. SO, 1920. [Made by J. W. Moulton.]
Gage Dis Date. height. charge.
Feet. Sec.-ft. Nov. 24...... 2.15 1,230 25...... 2.58 1,810 Apr. 21...... 6.19 8,520 3.20 2,940
Daily discharge, in second-feet, of St. Croix River near Baileyville, Maine, for the year ending Sept. 30, 1920.
Day. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept.
1...... 2,100 1,360 950 1,080 6,940 10,600 3,000 1,240 1,840 1,760 2...... 2,200 1,460 920 960 6,740 10,200 2,800 1,300 1,940 1,640 3...... 1,980 1,500 1,000 970 6,740 9,360 2,450 1,340 1,980 1,720 4...... 1,900 1,300 1,040 950 6,150 9,150 2,550 1,380 2,000 1,280 5...... 1,780 1,560 1,040 960 6,340 8,140 2,350 1,140 2,000 1,140 6...... 1,720 1,360 1,120 960 9,570 7,740 1,600 1,000 2,150 1,080 7...... 1,500 1,400 1,220 940 11,600 6,740 2,600 970 2,100 1,300 8...... 1,820 1,400 720 1,060 12,000 6,150 1,960 1,880 1,900 1,440 9...... 1,660 1,320 890 940 11,000 5,390 1,520 2,100 2,200 1,740 10...... 1,580 1,360 1,080 950 9,570 6,340 1,860 1,820 1,720 1,460 11...... 1,640 1,280 1,040 920 8,740 6,940 2,000 1,800 1,700 1,620 12...... 1,720 1,520 1,040 920 7,540 6,940 1,800 1,700 1,660 1,180 13...... 1,660 1,360 980 1,000 7,740 6,740 1,360 2,000 1,540 1,700 14...... 1,440 1,520 1,160 1,100 9,780 6,540 1,740 1,640 1,720 1,860 15...... 1,680 1,340 750 1,160 12,900 6,150 1,200 1,760 1,260 2,180 16...... 1,580 1,300 1,020 1,080 13,100 5,770 1,500 1,680 1,560 2,260 17...... 1,700 1,320 1,060 1,060 12,500 5,770 1,680 1,540 1,700 1,990 18...... 1,560 1,140 1,000 1,220 11,600 5,580 1,500 970 1,560 2,340 19...... 1,680 1,220 1,080 1,220 10,400 5,200 1,500 1,440 1,460 1,870 20...... 1,640 1,280 1,240 1,260 9,150 5,010 1,400 1,440 1,420 2,100 21...... 1,400 1,260 1,140 1,220 8,540 4,820 1,300 1,800 1,660 2,020 22...... 1,520 1,260 900 1,200 8,540 4,630 1,280 1,760 1,100 2,020 23...... 1,600 1,260 1,040 1,120 8,540 4,300 1,360 1,580 1,540 1,870 24...... 1,580 1,280 870 1,140 8,940 4,500 1,380 1,280 1,800 2,180 25...... 1,660 1,100 1,160 970 1,380 9,360 4,350 1,360 1,540 1,380 2,020 26...... 1,620 1,560 1,220 1,060 1,440 9,990 4,100 1,340 1,680 1,480 1,510 27...... 1,560 1,580 1,100 1,060 1,360 10,200 3,350 1,340 1,940 1,640 2,020 28...... 1,620 1,380 1,120 1,040 1,140 9,990 2,650 1,340 1,700 1,460 1,930 29...... 1,660 1,460 1,200 860 2,250 10,400 3,350 1,100 2,050 1,160 1,410 30...... 1,080 1,600 1,080 4,650 10,600 3,000 1,060 2,000 1,560 1,720 31...... 1,440 1,040 6,540 2,650 1,980 1,440
NOTE. Discharge estimated May 30 and July 11. Monthly discharge of St. Croix River near Baileyville, Maine, for the year ending Sept. SO, 1920. [Drainage area, 1,320 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile.
D ecemb er ...... 2,200 1,100 1,640 1.24 1.43 1,560 1,040 1,300 .985 1.14 February...... 1,240 720 1,010 .765 .83 6,540 920 1,420 1.08 1.24 April...... 13,100 6,150 9,510 7.20 8.03 May...... 10,600 2,650 5,880 4.45 5.13 3,000 1,060 1,710 1.30 1.45 July...... 2,100 970 1,600 1.21 1.40 2,200 1,100 1,670 1.27 1.46 2,340 1,080 1,750 1.33 1.48 SURFACE WATER SUPPLY, 1919-1920, I.
MACHIAS BIVEB BASIN. > MACHIAS RIVER AT WHITNEYVILLE, MAINE. LOCATION. At a wooden highway bridge in Whitneyville, Washington County, 200 feet below a storage dam and 4 miles above Machias. DRAINAGE ABEA. 465 square miles. (Measured on State assessor's map^) < RECORDS AVAILABLE. October 17, 1903, to September 30, 1920. , GAQE. Chain on the wooden highway bridge installed October 10, 1911; read by I. S. Albee. DISCHARGE MEASUREMENTS. Made from railroad bridge or by wading. CHANNEL AND CONTROL. Channel of gravel and ledge rock. Control for low stages is well defined riffle about 1,500 feet below gage; at high stages, control is not well defined. EXTREMES OF DISCHARGE. Maximum stage recorded, for the year ending Sep tember 30, 1919, 9.9 feet at 2.10 p. m. May 27 (discharge, 5,790 second-feet); minimum stage recorded, 3.4 feet at various times during July and August (dis charge, 221 second-feet). Maximum stage recorded, for the year ending September 30, 1920, 13.00 feet at 4.10 p. m. April 7, (discharge by extension of rating curve, 9,200 second-feet); minimum stage recorded, 2.94 feet August 30, 31, and September 1, 2 (discharge, 61 second-feet). 1903-1920: Maximum stage recorded, 14.7 feet September 30, 1909 (discharge by extension of rating curve, 11,100 second-feet); minimum stage recorded, 2.5 feet October 6, 1906 (discharge by extension of rating curve, 10 second-feet). ICE. River usually remains open at the gage, but ice farther downstream affects the stage-discharge relation. REGULATION. Operation of gates in storage dam immediately above station during low stages of the river causes considerable fluctuation; some log driving every year and jams of short duration occasionally occur. ACCURACY. Stage-discharge relation practically permanent except when affected by ice or by log jams. Rating curve well defined between 100 and 4,000 second- feet. Gage read to half-tenths once daily. Daily discharge ascertained by applying rating table to daily gage height, with corrections for effect of ice during the winter, and for log jams. Records fair. Discharge measurements of Machias River at Whitneyville, Maine, during the years ending Sept. SO, 1919 and 1920.
Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge.
1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Jan. 31 F. A. Dollofl...... o5.44 1,180 Feb. 24 04.88 385 Mar. 4 .....do:...... o4.45 718 Apr. 22 .....do...... 9.10 4,760 Sept. 12 63.80 385 Sept. 14 .....do...... *3.69 269 1920 Jan. '9 J. W. Moulton...... o3.71 272
Stage-diseharge relation affected by ice. 6 Stage-discharge relation affected by log jam. 102721 23 WSP 501 2 18 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Machias River at Whitneyville, Maine, for the yean ending Sept. SO, 1919 and 1920.
Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept.
1918-19. 920' 1...... 2,480 1,240 980 840 1,050 580 3,460 2,120 2,950 314 314 2...... 1,860 1,170 920 800 900 620 3,250 2,300 2,570 800 267 362 3...... 1,780 1,100 860 800 780 740 3,050 2,390 2,030 740 221 412 4*...... 1,780 1,040 800 800 720 720 2,850 2,120 1,460 682 221 1,240 5...... 1,860 980 740 800 660 720 2,750 1,860 1,310 682 221 1,310 6...... 2,750 920 74f» 74n 600 740 2,660 1,780 1,170 682 221 l,24t> 7...... 4,800 860 740 740 580 800 2,570 1,620 1,100 860 267 980 8...... 4,690 800 740 720 580 800 2,300 1,540 1,040 860 362 740 9...... 4,050 682 800 680 580 800 2,030 1,380 1,100 860 412 626 10...... 3,350 682 Qftft 680 580 2,390 1,620 1,240 1,170 860 517 626
11...... 2,750 682 860 660 540 2,390 1,780 1,170 1,170 800 464 626 12...... 2,300 682 830 660 520 1,940 1,860 1,170 1,170 800 412 544 13...... 1 860 711 Qftft 520 1,700 1,940 1,310 1,100 800 362 1,170 14...... 1^700 740 800 620 490 1,460 1,860 1,380 1,100 740 314 1,310 15...... 1,240 74f» 860 620 iQfl 1,310 1,540 1,040 682 267 1,170 16...... 980 74.0 1,380 600 490 1,700 1,780 1,540 980 571 267 860 17...... 860 740 1,310 600 440 2 91ft 1,780 1,620 980 517 267 626 18...... 800 1,100 1? 100 600 390 2,570 2,030 920 464 267 544 onn con OQA 19...... 2 91 A 980 3 1 %f\ 2,120 3,250 860 464 267 617 20...... 860 3 050 Oftft 580 390 1,940 3,050 800 412 267 517 21...... 920 2,750 Qftft 580 390 3,750 1,780 2,750 800 362 314 314 22...... 1,100 2,120 onn EOA 360 4,150 1 700 2,570 682 267 362 517 23...... 1 240 1,860 920 580 360 4,360 L620 2,480 682 267 362 671 24...... l'380 1,700 1 040 740 ofin 1,540 2,480 740 221 412 571 25...... I Jftft 1 Rift 1, 100 9 Q*\ri 3,750 1,460 2,950 770 221 12 626 26...... 1 Aftft - 1,310 1,050 3 1 5A 490 3,350 1 460 5,570 800 221 387 517 27...... 1,460 1,100 980 2,650 540 a ft Eft 1 540 t* 700 860 314 362 464 28...... I Qsn 1 '980040 940 2 C.AA ECrt 3 QKA l'700 5,570 920 412 362 267 29...... 1,310 920 i QAft 3,550 1,780 3,250 920 517 338 362 30...... 1,310 980 900 I "7AA 3 350 i 7ftn 7 v»n 920 464 314 464 31...... 1,310 860 1 1 Sft 3^350 3,350 412 314 1919-20. 1...... 412 740 Ir620 300 140 320 6,340 4,150 800 1,540 380 61 2...... 362 860 1,310 300 140 300 5,900 3,750 860 1,380 400 61 3...... 770 Q9O ^ftft 140 OAf| 5,020 3,550 860 1,170 480 74 4...... 362 626 770 Qftft 140 280 5,020 3,350 860 770 460 89 S.i...... 654 711 9Qfl 140 260 5,020 9 QKA 920 920 400 89 6...... 007 1,620 654 OQft 140 260 7 000 2,570 1,040 860 420 110 7...... 412 3 QKft 626 280 ivi 270 9*200 2,210 1,170 711 410 130 8...... 362 9 flfifl 626 97/\ 150 l ^270 8,100 1,240 1,100 700 330 150 9...... QQQ 1 CHA 626 97n ittfi 270 6,780 1,700 1,040 700 260 150 10...... 1,100 711 97ft 150 260 5,680 3 CCft 920 fidja 250 150 nen 11...... QQ7 920 1 '770040 97n 1*Lft 260 3 3,350 800 600 250 150 12...... 464 OAA OQft 1 %f\ OCA 3 7KA S een 580 - 250 170 13...... 517 749 800 QAA 180 OKft 3 QRfl 711 520 239 200 14...... ei 7 770 QSfl Qftft 91 fl 1 *>Kft 8 -IAA 3 1 KA 1OS 480 239 250 15...... 517 QAA 1 240 9Qft 200 1 7*J1 8 QQA 2 7KA AQfl 4 NOTE. Stage-discharge relation aflected by ice from Dec. 26, 1918, to Mar. 5, 1919; discharge for this period based on gage heights corrected for effect of ice by means of two discharge measurements, observer's notes, and weather records. Logs were jammed at control during greater part of the time from Aug. 20, 1919. to Sept. 20, 1919; results of discharge measurement made Sept. 12 used as a guide in applying cor rection for effect of logs. Stage-discharge relation affected by ice Jan. 1 to Mar. 23, 1920, and by logs from July 8 to Aug. 12, 1920. Aug. 22-28, 1920, and Sept. 6-30, 1920. Discharge for these periods determined from gage heights corrected for effect of ice and logs, by discharge measurements, observer' motes, and hydrograph compari sons with other rivers. > UNION RIVEB BASIN. Monthly discharge of Machias River at Whitneymlle, Maine, far the years ending Sept, 30, 1919 and 1920. Discharge in second-feet. Month. Per Run-off Maximum. MfnJTtiniti- Mean. square in inches. mile. 1918-19. October...... 4,800 800 1,870 4.02 4.64 3,050 682 1,210 2.60 2.90 1,380 740 910 1.96 2.26 3,150 580 1,040 2.24 2.58 1,050 360 542 1.17 1.22 March . 4,360 580 2,290 4.92 6.67 April...... 3,450 1,460 2,060 4.43 4.94 May...... 5,790 1,170 2,470 ;5.31 6.12 2,950 682 1,140 2.45 2.73 July...... 920 221 577 1.24 1.43 August ...... 517 221 326 .701 .81 September ...... 1,310 267 680 1.46 1.63 5,790 221 1,260 2.71 36.93 1919-20. ,544 314 416 .895 1.03 3,950 464 941 2.02 2.25 December ...... 1,620 314 701 1.51 1.74 300 140 261 .561 .65 February...... 410 140 235 .505 .54 6,890 250 1,790 3.85 4.44 April...... 9,200 3,550 5,840 12.6 14.06 May...... 4,150 711 2,080 4.47 5.15 1,700 490 1,070 2.30 2.67 July...... 1,540 360 596 1.28 1.48 480 61 250 .538 .62 September ...... 620 61 303 .652 .73 The year ...... 9,200 61 1,200 2.58 35.26 TTNION RIVER BASIN. WEST BRANCH OF TTNION RIVEB AT AMHERST, HAUTE. LOCATION. At highway bridge three-fourths mile west of Amherst post office, Han cock County, on road to Bangor, ] mile below high way bridge at old tannery dam. DHAINAGE AREA. 140 square miles. RECORDS AVAILABLE. July 25, 1909, to September 30, 1919, when station was dis continued. GAGE. Chain, installed June 2, 1910, at same datum as old vertical gage nailed to log abutment; read by Mrs. Emma Sumner. DISCHARGE MEASUREMENTS. Made from downstream side of the bridge. CHANNEL AND CONTROL. Gravel; unlikely to change except in unusual flood. EXTREMES oi? DISCHARGE. Maximum open-water stage recorded during year 10.9 feet at 4 p. m. October 6 (discharge, 1,440 second-feet); (a stage of 14.9 feet was recorded on January 8, but the stage-discharge relation was affected by an ice jam); minimum stage recorded, 5.3 feet morning of August 31 to afternoon of Sep tember 2 (discharge, 20 second-feet). 1909-1919: Maximum open-water stage recorded, 12.8 feet at 4 p. m. March 21, 1913 (discharge, 2,160 second-feet); minimum open-water stage recorded, 4.84 feet September 15, 1912 (discharge, 14 second-feet). ICE. Stage-discharge relation seriously affected by ice. REGULATION. Regimen of stream only slightly affected by the operation of the few log-driving dams above the station. ACCURACY. Stage-discharge relation remained practically permanent during the year, except as affected by backwater from ice. Rating curve well defined between 30 and 1,200 second-feet. Gage read to half-tenths twice daily, except from December 16 to March 26, when it was read three days a week. Daily dis- SURFACE WATER SUPPLY, 19>1 /> charge ascertained by applying rating table to mean daily gage height with corrections for effect of ice during the winter. Records fair. The following discharge measurement was made by H. A. Lancaster: January 17, 1919: Gage height, 12.88 feet; discharge, 169 second-feet. Stage- discharge relation affected by ice. Daily di, in second-feet, of West Branch of Union River at Amherst, Maine, for the year ending Sept. 30, 1919. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. I...... 710 605 440 250 480 175 1,360 347 325 74 39 20 2...... 656 605 420 240 390 190 1,120 438 347 68 39 20 3...... 682 , 556 390 240 350 230 1,200 461 304 62 34 50 4...... 682 484 370 240 300 220 1,120 461 245 62 29 50 5...... 800 369 350 240 280 220 1,080 461 199 68 29 39 6...... 1,360 369 320 230 260 230 930 461 174 62 29 39 7...... 1,240 347 310 230 240 240 710 415 174 62 31 29 8...... 930 304 300 220 230 240 347 392 190 62 39 29 9...... 832 264 280 210 210 240 605 369 174 62 37 39 10...... 800 264 260 200 200 500 151 235 174 62 37 39 *!...... 800 245 260 200 190 640 580 461 151 62 34 39 12...... 800 245 250 190 180 640 832 484 144 62 30 39 w...... 800 208 240 180 170 560 930 461 129 62 29 AJ. 14...... 800 208 240 180 160 480 864 461 114 62 31 $ 15...... 580 190 260 170 150 450 864' 461 114 62 34 50 '484 1^..,...... 580 190 350 170 14.5 500 800 114 62 29 44 17...... 484 190 350 170 130 580 740 508 107 62 29 50 18...... 508 325 35Q 170 120 660 897 484 100 62 29 50 19...... 508 484 320 170 120 780 897 415 100 62 29 62 fc...... 508 656 300 170 120 860 864 392 93 62 29 62 21...... 508 656 280 170 115 930 800 347 80 62 29 62 23...... 556 630 280 170 105 965 710 304 80 56 27 74 23...... 484 656 280 170 105 1,120 580 325 80 50 27 74 24...... 484 656 300 230 115 1,240 392 325 80 50 27 74 25...... 461 605 320 600 130 1,160 226 304 74 50 27 68 26...... 438 580 320 660 130 1,120 208 461 74 50 24 62 27...... 4.84 556 310 680 160 930 144 532 87 39 24 62 28...... 438 532 300 660 175 1,080 186 461 87 39 24 62 29...... 136 500 280 660 1,160 159 415 74 39 24 62 30...... 484 480 270 600 1,320 284 325 74 39 21 50 31...... 605 260 un 1,360 325 39 20 NOTE. Stage-discharge relation affected by ice Nov. 29 to Mar. 20. Discharge estimated on basis of g'age heights corrected for effect of ice by means of one discharge measurement, observer's notes, and weather records, and by comparison with records for Machias River. Monthly discharge of West Branch of Union River at Amherst, Maine, for the year ending Sept. 30, 1919. [Drainage area,-140 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1,360 136 650 4.64 5.35 656 190 432 3.09 3.45 440 240 308 2.20 2.54 680 170 297 2.12 2.44 480 105 195 1.40 1.46 1,360 175 678 4.84 5.58 April...... 1,360 144 685 4.89 5.46 May...... 532 235 412 2.94 3.39 347 74 142 1.01 1.13 July...... 74 39 57.3 .409 .47 August...... 39 20 29.7 .212 .24 74 20 49.6 .35* .40 1,360 20. 329 2.35 31.91 &TJRFA E WATER SUPPLY, 1919-1920, PABT I. PENOBSCOT RIVER BASIN. WEST BRANCH OF PENOBSCOT RIVER AT MILLINOCKET, MAINE. , i LOCATION. At Quakish Lake dam and Millinocket mill of Great Northern Paper Co., Millinocket, Penobscot County. DRAINAGE AREA. 1,910 square miles (measured on map compiled by Maine Water Power Commission). RECORDS AVAILABLE. -January 11,1901, to September 30,1920. GAGES. Water-stage recorder at Quakish Lake dam and gages in forebay and tailracfe at mill. CHANNEL AND CONTROL. Crest of concrete dam. ' DISCHARGE. Flow computed by considering the flow over the dam, the flow through the wheels, and the*water used through the log sluices and niters. The wheels were rated at Holyoke, Mass., before being placed in position and were tested later by numerous tube-float and current-meter measurements. Ratings for four new wheels installed ia 1917 are based on acceptance test on one unit after installation; the discharge at various gate openings being measured by the use of Pitot tubes. When the flow of the river is less .than 3,000 second-feet, all the water generally flows through the wheels of the mill. ICE. Determination of discharge not seriously affected by ice; Ferguson Pond, just above entrance to canal, eliminates effect from anchor ice. REGULATION. Dams at outlets of North Twin and Ripogenus lakes store water on a surface of about 73 square miles, having a capacity of about 41.5 billion cubic feet. Except during the time (usually in August) when excess water has to be supplied for log driving on the river below Millinocket and for a short time during the spring freshet, run-off is regulated by storage. Records corrected for storage. COOPERATION. Records furnished by engineers of Great Northern Paper Co. Monthly discharge of West Branch of Penobscot River at Millinocket, Maine, for the years ending Sept. 30, 1919 and 1920. [Drainage area, 1,910 square miles.] Discharge in second-feet. Corrected for storage. Corrected Month. run-off in Observed inches. (mean). Per Mean. square mile. 1918-19. October...... 2,980 3,240 1.70 1.96 4,280 5,650 2.96 3.30 3,460 3,100 1.62 L87 2,940 2,230 1.17 1.35 3,040 1,120 .586 .61 3,010 2,210 1.16 1.34 April...... 6,410 9,910 5.19 5.79 May...... 12,600 12,800 6.70 7.72 3,810 3,350 1.75 1.95 July...... 3,080 1,940 1.02 1.18 3,080 1,240 .649 .75 September,...... 3,020 1,060 .555 .62 4,710 4,020 2.10 28.44 1919-20. 2,410 1,710 .895 1.03 2,390 4,050 2.12 2.3ft 2,600 1,560 .817 .94 January.... 3,070 491 .257 .30 3,060 485 .254 .27 March...... 3,010 463 .242 .28. April...... 3,000 11,800 6.18 ^ 6.90 May...... 6,740 10,200 5.34 6.1ft 3,300 2,920 1.53 1.71 July...... 2,960 2,800 1.47 1.70 3,130 1,370 .717 .83 September...... 3,050 2,040 1.07 1.19 The year 3,230 3,320 1.74 23.67 SUBFACE WATER SUPPLY, 1919-1920, PABT I. WEST BRANCH OF PEHTOBSCOT RIVER NEAR MEDWAY, MAINE. LOCATION. Just above Nichatou Rapids, half a mile above mouth of East Branch of Penobscot River and town of Medway, Penobscot County, and 2 miles below East Millinocket. DEAINAGE ABBA. 2,120 square miles (measured on map compiled by Maine Water Power Commission). KECOEDS AVAILABLE. February 20, 1916, to September 30, 1920. GAGE. Gurley 7-day water-stage recorder on left bank, inspected by Scott Nadeau. DISCHAEGE MEASUREMENTS. Made from cable. CHANNEL AND CONTROL. Bed fairly smooth at measuring section; covered with rocks and boulders above and below gage. Channel divides a few hundred feet below gage, but practically entire flow passes to left of Nichatou Island. Control formed by Nichatou Island and head of Nichatou Rapids; somewhat shifting. EXTREMES OF DISCHAEGE. Maximum stage from water-stage recorder for the year end ing September 30, 1919, 8.68 feet at 3 a. m. April 26 (discharge from extension of rating curve, 16,300 second-feet); minimum stage from water-stage recorder, 2.08 feet at 10.30 a. m. July 6 (discharge from extension of rating curve, 1,130 second- feet). Maximum stage from water-stage recorder for the year ending September 30,1920, 7.50 feet at noon May 15 (discharge from extension of rating curve, 14,300 second-feet); minimum stage from water-stage recorder, 1.90 feet at 10.30 a. m. January 9 (discharge, from extension of rating curve, 1,000 second-feet). 1916-1920: Maximum stage recorded, 9.88 feet at 1 p. m. June 18, 1917 (dis charge, from extension of rating curve, about 20,000 second-feet); minimum stage recorded, 1.45 feet at 9. 45 a. m. January 7, 1917 (discharge, from extension of rating curve, 585 second-feet). ICE. Ice forms along banks, but the main channel remains open; stage-discharge relation not seriously affected. REGULATION. Flow at ordinary stages completely regulated by dams and storage reservoirs above station. Monthly discharge corrected for storage. ACCUEACY. Stage-discharge relation shifted slightly at time of high water in June, 1917, and again in May, 1920. Rating curve used previous to June, 1917, well defined between 600 and 12,000 second-feet; curves used subsequent to that date well defined between 2,000 and 12,000 second-feet. Daily discharge ascer tained by discharge integrator. Records good. Discharge measurements of West Branch of Penobscot River near Medway, Maine, during the years ending Sept. SO, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-iK 1920. Feet. Sec.-ft. Aug. 29 J.W. Moulton...... 4.22 3 ?nri May 18 J.W. Moulton...... 7.12 13,000 June 24 .....do...... 4.12 4,040 1920. July 12 Lancaster and Butler. . 3.75 3,400 Mar. 16 J. W. Moulton...... 4 04 3,270 Sept. 17 J.W. Moulton...... 4.14 4,210 PENOBSCOT EIVEE BASIN. 23 Daily discharge, in second-feet, of West Branch of Penobscot River near Medway, Maine, for the years en-ding Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 3,680 4,400 6,660 3,750 3,500 4,900 14,300 9,700 3,250 3,300 3,150 2...... 3,480 4,220 6,000 Is, 800 3,150 2,900 4,650 14,500 9,500 3,300 3,400 3,550 3...... 3,620 3,500 4,900 3,750 3,200 4,450 14,400 7,500 3,100 3,200 3,450 4...... 3,320 4,100 3,920 S,SOO 3,900 3,400 4,350 14,300 5,900 2,800 3,400 3 JAA 5...... 3,550 3,900 5,000 3,380 3,700 3,500 4,150 14,600 4, 450 3,300 3,600 3,300 3,650 3,800 5,000 3,650 3,640 3,550 3,750 15,400 4*550 2,950 3,650 3,300 'I1::::::::::: 4,580 3,750 5,000 4,000 3,840 3,500 3,650 13,500 4,150 3,100 3,850 2,750 8»...... 4,220 3,800 4,400 4,100 3,500 4,200 11,300 3,800 3,100 3,800 3,150 9...... 4,000 3,860 4,300 3,680 3,100 4,300 10,800 3,700 3,000 3,650 3,250 10...... 3,850 3,450 4,300 4,100 3,600 4,300 10,900 4,300 3,200 3,000 3,200 11...... 3,700 3,650 4,100 4,000 4,450 3,800 4,300 12,800 4,000 3,300 3,350 3,250 12...... 3,600 4,000 3,500 4,000 3,680 4,750 14,300 5,000 3,200 3,550 3 Q/V\ 13...... 3,100 3,900 4,050 3,700 3,750 4,700 13,700 5,700 3,200 3,500 3,650 14...... 3,400 3,820 4,030 3,750 3,750 4,750 12,900 5,600 4,150 3,450 3,300 15...... 3,720 3,680 4,100 3,830 3,700 4,650 12,300 5,600 4,500 3,300 3,350 16...... 3,550 3,300 4,000 3,100 2,800 4,250 12,000 -5,800 2,800 3,200 3,400 17-...... - 3,580 3,300 37950 3,350 3,600 4,200 11,400 ;e,ooo 3,050 2,650 3,400 18...... -- 3,600 4,220 4,000 3,900 3,500 3,600 4,250 11,200 :5,600 3,300 3,000 3,500 19 3,650 5,220 3,200 3,550 3,600 4,500 11,300 ( 4,750 3,500 3,100 3,450 *m 3,250 5,300 3,500 3,500 3,650 6,000 10,700 14,350 3,250 3,150 3,350 91 3,550 5,250 3,750 3,550 3,600 6,650 9,300 ,4,250 3,250 3,150 2,800 12...... 3,900 5,550 3,700 3,700 3,350 4,400 6,200 8,800 4,050 3,500 3,300 3,150 23...... 3,750 7,200 3,800 3,650 3,200 4,180 6,400 10,500 4*350 3,650 3,200 3,300 24...... 3,640 10,300 3,700 3,800 3,350 4,400 8,600 12,700 ;3,850 3,600 2,400 3,300 25-...... -.-. 3,550 10,800 3,340 3,950 3,650 4,600 12,600 11,500 3,500 3,550 2,900 3,280 Oft 3,660 9,950 3,750 3,520 3,500 4,450 14,400 11,600 3,700 2,600 3,100 3,400 27-.....-.-- 3,340 9,550 3,820 3,700 3,550 4,350 14,400 11,400 3,650 3,300 3,200 3,500 no 3,680 9,100 3,800 3,900 3,600 4,350 14,200 10,900 3,700 3,600 3,200 2,500 9Q 3 QOA 8 &nn 3,600 3,750 4 800 14,000 9,500 3,250 3-, 400 3,350 3,300 30...... 3,900 7,700 3,500 3,750 ...... 4,600 14,300 9,000 3,400 3,150 3,500 3,100 qi 4,350 3,600 3,650 5,000 9,600 3,300 2,850 1919-20. 1...... 3,000 2,950 3,250 3,250 4,000 3,300 3,550 5,600 6,000 3,400 3,000 3,200 3,150 2,750 3,300 3,450 4,000 3,550 3,500 5,100 6,200 3,400 3,150 3,200 3,200 3,300 3,250 3,750 3,800 3,550 3,700 5,000 6,100 3,200 3,400 3,350 4...... 3,250 3,050 3,150 3,000 3,450 3,300 5,500 6,000 2j,800 3,500 3,200 5...... 3,000 3,250 3,000 3,200 3,750 3,100 3,400 6,400 1 6,000 3,100 3,700 3,050 6...... 3,350 3,550 3,000 3,300 3,700 3,650 4,300 5,500 5,500 3,550 4,150 2,850 7...... 3,450 3,600 2,450 3,300 3,700 3,550 4,250 5,200 5,400 3,350 4,100 3,300 3,500 3,700 3,100 3,300 3,150 3,450 4,200 5,400 5,700 3,400 3,550 3,600 3,100 3,450 3,000 3,150 3,550 3,450 4,200 5,800 5,400 3,500 4,000 3,650 10...... 2,750 3,700 3,050 3,550 3,900 3,450 4,400 6,400 5,100 3,750 3,800 3,400 11...... 2,700 3,600 3,250 3,350 3,850 3,650 3,900 7,100 5,000 2,850 3,600 3,400 10 2,200 3,300 3,350 3,150 3,800 3,650 4,250 8,700 4,900 3,250 3,700 3,250 13...... 2,700 3,450 3,300 3,850 3,700 3,450 4,900 10,000 i 4,060 3,300 3,500 2,800 14...... 2,750 3,600 2,700 3,650 3,600 2,600 6,300 10,600 '3,900';3,750 3,350 3,500 3,550 15...... 2,700 3,600 3,100 3,650 2,950 2,500 6,500 11,600 3,400 3,350 3,800 16...... 2,700 2,900 3,300 3,600 3,000 3,200 6,300 11,200 3,850 3,600 3,250 4,250 17...... 2,800 3,300 3,300 3,750 3,750 3,050 5,800 11,000 3,850 3,250 3,450 3,800 18...... 2,750 3,400 3,200 3,450 3,550 2,950 5,400 11,600 ,3,850 2,700 3,100 3,450 19...... 2,500 3,200 3,100 3,800 3,600 3,050 5,300 11,600 13,850 3,200 3,150 3j250 20...... 2,800 3,350 3,050 4,450 3,700 3,200 5,500 11,600 .3,500 3,600 3.J50 3,450 21...... 2,500 3,100 3,000 4,100 3,650 2,850 5,'600 Hj400 ,3,650 3,150 3,100 3,800 22...... 2,550 3,050 3,200 3,800 2,750 3,150 5,600'"5,500, 14,000 ,3,300 2,950 3,800 23...... 2,600 2,400 3,300 3,750 3,000 3,300 lO'SOu 3,950 3,550 2,950 3,700 24...... 2,550 3,250 3,200 3,600 3,550 3,450 5,700 10*400 iS.SOQV 3,400' a, 950 3,500 25...... 2,650 3,250 3,000 3,300 3,600 3,600 4,950 9,700 3,250 2,950 3,400 3,400 26...... 2,450 3,100 3,000 3,300 3,500 3,400 5,000 9,400 3,250 3,400 3,400 3,050 27...... 2,650 3,150 3,000 3,400 3,500 3,500 5,100 8,100 3,000 3,200 3,450 3,050 28...... 2,700 3,000 3,100 3,350 3,700 2,950 5,400 6,900 3,000 3,250 3,300 3,250 29...... 2,650 3,000 3,150 3,500 3,250 3,150 6,300 5,500 3,200 3,300 2,900 3,550 30...... 2,950 2,600 3,250 3,500 3,600 6,100 4,650 3,300 3,300 3,000 3,450 31...... 2,700 3,350 4,100 3,550 4,900 3,350 3,000 NOTE. Discharge estimated by comparison with records at adjacent stations for the following da y: Oct. 9, Dec. 6-22 and 31, 1918; Jan. 1-3, 17, Mar. 16-21, Nov. 7-8, 14-15, Dee. 14-19, and 22-26, 1919: Jan. 29-30, Feb. 3, 13, Mar. 15, Aug. 10, 31, and Sept. 1, 1920. Braced figures show mean discharge for period included. , 24 SURFACE WATER SUPPLY, 1919'-1920, PART I. Monthly discharge of West Branch of Penobscot River near Medway, Maine, for.\tfie years ; ending Sept. SO, 1919 and 1920. [Drainage area, 2,120 square miles.] Discharge in second-feet. Corrected Month. Observed. Corrected for storage. run-off ia inches. Per square Maximum. Minimum. Mean. Mean. mile. 1918-19. 4,580 3,100 3,690 3,950 1.86 2.14 10,800 3,300 5,430 6,800 3.21 3.58 6,660 3.340 4,190 3,830 1.81 2.09 4,400 3,200 3,830 3,120 1. 47 1.70 4,450 3,100 3,650 1,730 .816 .85 5,000 2,800 3,820 3,020 1.42 1.64 14,400 3,650 6,690 10,190 4.81 5.37 May...... 15,400 8,800 12,000 12,200 5.75 6.63 9,700 3,250 4,920 4,460 2.10 2.34 July...... 4,500 2,600 3,300 2,160 1.02 1.18 3,850 2,400 3,270 1,430 -.675 .,78 3,650 2,500 3,270 1,310 .618 :m The year...... 15,400 2,400 4,840 4,520 2.14 28.99 1919-20. , 3,500 2,500 2,820 2,120 1.00 l.li> 3,700 2,400 3,230 4,890 2.31 2. 58 3,350 2,, 450 3,120 2,080 .981 1.13 4,450 3,000 3,540 961 .453 .52 4,000 2,750 3,560 985 .465 .50 3,650 2,,500 3,300 753 .355 .41 April...... 6,500 3,300 4,940 13,740 6.48 7.23 MUy...... 11,600 4,650 8,200 11,660 5.50 6.34 6,200 3,000 4,410 4,030 1.90 2.12 July...... 3,750 2,700 3,290 3,130 1.48 1.71 4,150 2,900 3,380 1,620 .764 .8& 4,250 2,800 3,410 2,400 1.13 1.26. 11,600 2,200 3,940 4,030 1.90 25. 83 PEHOBSCOT RIVER AT WEST ENFIELB, HAUTE. LOCATION. :At steel highway bridge 1,000 feet below mouth of Piscataquis River and 3 miles west of Enfield railroad station, Penobscot County. DRAINAGE AREA. 6,600 square miles. RECORDS AVAILABLE. January 1, 1902, to September 30, 1920. « GAGES. Friez water*stage recorder on left bank, downstream side of left bridge abutment, used since December 11, 1912; chain gage on upstream side of bridge used prior to that date; gages set to same datum. Recorder inspected by M. M. Swett. DISCHARGE MEASUREMENTS. Made from bridge. CHANNEL AND CONTROL. Channel at gage broken by four bridge piers; straight above and below the gage. Banks high and rocky and not subject to overflow. Control is at Passadumkeag Bips, about 5 miles below the gage; a wing dam at this point is overflowed at about gage height 5.5 feet. PENOBSCOT EIVER BASIN. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder, for the "year ending September 30, 1919, 11.91 feet at 11 p. m. April 26 (discharge, 45,000 second-feet); minimum stage during year from water-stage recorder, 2.24 feet at 2 a. m. August 26 (discharge, 3,710 second-feet). Maximum stage from water-stage recorder, for the year ending September- 30, 1920, 15.75 feet at 11 p. m. April 15 (discharge, from extension of rating curve, 72,300 second-feet); minimum stage from water-stage recorder, 2.37 feet at 10 a. m. October 5 (discharge, 3,990 second-feet). 1902-1920: Maximum stage recorded, 17.8 feet September 30, 1909 (discharge,, from extension of rating curve, 88,700 second-feet 3); minimum stage recorded, 1.0 foot at 7 a. m. and 5 p. m. October 29, 1905 (discharge, 1,470 second-feet 3). ICE. Stage-discharge relation usually affected by ice from December to April; dis charge ascertained by comparison with records at Sunkhaze Rips near Costigaft collected by Thomas W. Clark. REGULATION. Flow largely controlled by storage, principally in the lakes tributary to the West Branch. Records not corrected for effect of storage. ACCURACY. Stage-discharge relation practically permanent except as affected by ice and by logs. Rating curve well defined between 2,500and 90,000 second-feet. Operation of water-stage recorder satisfactory throughout both years. Daily dis charge ordinarily ascertained by applying rating table to average gage height taken from recorder sheet; at times of serious fluctuations in stage the daily discharge is ascertained by using the average of 12 two-hour periods. Gage heights corrected for effect of ice and log jams. Records good. COOPERATION. Discharge computations and several discharge measurements made by Thomas W. Clark, hydraulic engineer, Old Town, Maine. Discharge measure ments also made by students of the "University of Maine, under the direction of Prof. H. S. Boardman. Discharge measurements of Penobscot River at West Enfield, Maine, during the years ending $ept. 30, 1919 and 1920. Dis Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Oct. 8 University of Maine 3.66 7,330 June 24 Clark, Lancaster, and 3.22 5,850 students. Butler. 8 .....do...... 3.66 7 260 Aug. 10 3.08 5,500 24 .....do...... 3.36 6'780 24 .....do...... 3.36 6,290 'Based on revised rating curve of 1918. SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in .second-feet, of Penobscot River at West Enfield, Maine, for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 191*- 19. I...-. 16,200 24,500 19,300 10,300 11,000 6,300 39,200 41,000 25,800 7,400 6,200 4,170 2.... 14 400 25,200 16,400 11,300 10,000 6,500 35,000 40700 23,500 7,170 6 140 4,610 3.... 12,800 23,000 14,100 12,000 9,000 6,500 31,300 42,200 21,300 6,900 5,650 5,070 4.... 11,800 21,000 12.600 12,100 8,800 6.800 28,000 43,700 17^600 6,400 5,300 4,840 5.... 11,100 19,900 11,300 10,800 9,000 7,300 25,800 41,600 15,200 6,000 5,070 4,840 6..,. 13,700 18,000 12,600 .9,900 8,500 7,600 23,»30 41,000 13,500 6,520 5,300 4,610 7.... 26,500 15,800 12,600 9,600 8,300 7,600 22,800 39,500 13,400 6,500 5,190 4,390 8.... 28,600 14,300 12,500 9,600 8,100 7,600 24,500 33,800 14,100 6,200 5,650 4,280 9.... 24,500 13,400 12,600 9,700 7.800 7,400 26,500 29,900 15,400 6,200 5,890 4,730 10.... 20,200 13,000 11,800 9,400 7,400 7,600 26,200 28,000 15,000 6,100 5,300 4,960 11.,.. 17,800 12,500 10,000 9,100 7,400 "9,900 25,500 28,000 14,300 6,000 4,730 4,960 12.... 16,200 12,500 i 9,400 8,700 7J600 11,500 27,800 28,800 14,300 6,000 5,300 5,070 13.... 14,800 12,000 9,400 7,700 7^200 11,800 38.600 28,000 13,700 6,260 5,300 6,780 14.... 13,500 11,300 9,900 8,000 6,800 11,100 41,000 27,000 13,000 6,000 5 420 9,270 15.... 13,000 11,000 10,300 9,100 6,800 10,500 40,400 25,800 12,300 7,200 5,300, 9,420 16..... 12,800 10,500 10,300 9,300 7,000 9,900 39,200 24,800 11,300 7,440 5,190 8,400 17.... 12,100 10,200 10,300 8,800 6 600 9,100 37,700 22,500 11,600 5,700 4,840 7,440 18.... 11,800 11,100 10,300 8,500 6,600 9,300 38,000 23,500 11,800 5,900 4,390 6,650 19.... 12,000 26,500 10,000 8,500 6,800 11,000 35,600 33,200 11,600 5,900 4,390 6,140 20.... 11,500 36,800 9,600 7,700 6,800 15,400 35,900 33,000 10,500 6,300 4,610 5.770 21.... 12,000 40.400 9,300 7,600 6,300 22,500 33,800 28,800 9,870 5,900 4,730 5,190 22.... 14,800 40,100 9,400 7,700 6,300 28,600 31,300 25,800 9,870 5,200 4,730 4,840 23.1.. 15,200 37,100 10,000 8,000 6,100 34,400 28,600 26,200 9,870 5,500 4,610 5,070 24.... 13,900 36,200 12,000 8,800 6,000 34,700 28,800 35,000 9,420 5,400 4,500 5,650 25.... 13,000 34,700 14,800 11,300 6,100 37,700 33,000 33,500 8,680 5,400 3,950 6,010 26.... 12,100 30,200 14,300 13,500 6,300 36,500 42,800 31,800 7,980 5,200 4,280 5,770 27.... 13,000 26,500 13,700 13,500 6,300 34,100 43,400 38,300 7,800 5,300 4,610 6,010 28.... 13,200 24,000 12,300 13,900 6,000 33,000 40,700 39,200 7,800 5,300 4,.610 5,770 29.... 13,400 22,500 12,800 13, 200 37,100 38,000 36,200 7,400 5,700 4,610 5,190 30.... 13,000 21,300 12,000 12,600 42)200 38,900 31,600 7,200 6,700 4,610 5,300 31 16,800 10,500 12,000 41,900 28,000 6,800 4,500 1919- 20. 1.... 5,070 9,700 14,800 5,800 4,900 4,400 29,100 53,100 12,100 7,170 6,000 4,960 2.... 4,960 13,300 14,700 5,800 4,500 4,100 29,700 48,900 11,600 7,300 5,770 5,190 3.... 4,610 12,800 11,000 5,800 4,100 4,400 30,200 45,200 11,300 7,440 5,650 5,420 4.... 4,610 12,100 7,800 6,000 4,500 4,400 30,500 42,200 11,000 7,300 5,770 5,530 5.... 4,500 11,300 7,400 5,700 4,700 4,300 30,700 40,100 10,700 7,840 5,890 5,190 6.... 4,610 13,100 8,500 5,000 5,000 4,300 33,500 37,100 10,300 9,570 6,140 4,500 7.... 5,890 15,900 8,700 5,500 5,000 4,800 46,100 33,500 11,000 10,200 6,390 4,960 S.... 6,650 16,100 8,400 5,900 4,800 4,700 47,200 32,100 14,600 9,420 6,010 6,390 9.... 6,520 14,800 8,600 5,900 4,800 4,400 48,600 37,400 15,000 8,970 5,420 8,830 10.... 5,770 13,300 9,000 5,600 4,300 4,700 44,000 55,900 13,400 9,420 5,530 9,570 11.... 5,650 12,500 8,600 5,300 4,500 4,900 40,400 52,800 12,100 8,540 5,530 8,970 12,... 5,770 11,700 7^900 5,200 4,800 5,000 46,800 46,800 11,100 7,300 6, 140 8,830 13.... 5,890 11,800 8,300 4,800 4,900 5,200 48,600 43,700 10,800 7,300 6,910 8,830 14.... 5,890 19,300 8,900 4,900 5,000 5,400 56,600 41,300 9,870 7,600 7,300 12,800 15.... 5,190 22,000 8,600 5,100 5,000 5,500 71,100 39,800 9,120 7,400 7,170 18,000 16.... 5,300 19,800 7,900 4,900 5,000 4,900 69,900 37,100 8,970 6,900 6,650 17,400 17.... 5,300 17,500 7,300 5,100 4,100 5,600 66,400 33,800 8,830 6,900 6,390 15,600 18.... 5,770 16,300 6,800 4,900 4,200 6,100 65,300 32,100 8,540 6,300 6,650 13,900 19.... 5,530 15,100 6,300 5,000 4,700 6,100 60,100 31,300 7,980 6,100 6,010 13,000 20.... 5,420 14,300 6,000 4,800 4' 700 6,200 57,600 30,500 7,570 6,800 5,770 12,100 21.... 6,010 13,000 6,100 5,100 4,700 6,100 58,400 29,600 7,040 7,300 5,770 11,300 22.... 5,420 11,900 6,000 5,300 4,700 6,200 59,400 27,800 6,910 7,200 5,300 10,500 23.... 5,770 11,800 5,800 5,500 4,700 5,800 58,400 26,200 7,040 7,200 5,530 9,720 24.... 6,140 11,600 6,000 5,400 4,100 6,400 57,600 24,200 6,780 7,300 7,170 8,830 25.... 6,140 12,900 6,000 5,400 4,300 7,100 57,300 22,800 7,300 6,900 7,300 8,260 26.... 5,530 12,100 5,800 5,200 4,600 7,600 52,800 21,000 7,300 6,400 6,520 7,710 27.... 6,260 11,300 5,800 4,500 4,700 9,500 48,200 19,500 7,570 6,800 6,140 6,910 28.... 6,910 10,700 6,000 4,900 4,500 12,700 45,200 17,200 7,040 6,400 5,890 6,650 29.... 7)300 10,100 6,000 5,000 4,400 18,000 52,800 15,200 6,780 6,300 5,300 6,650 30.... 7,840 11,500 5,700 4,800 22,500 57,000 13,700 7,300 6,000 . 4,840 7,710 31.... 8,120 5,800 ' 5,000 27,300 12,800 6,000 4,730 NOTE. Stage-discharge relation affected by ice Dec. 6,1918, to Mar. 25,1919; discharge computations for this period based on gage heights corrected for effect of ice by means of numerous discharge measurements and other data collected at Sunkhaze Rips. Stage-discharge relation affected by log jams June 27-30,1919, July 1.3-5,7-12,14-15,17-31,1919, and Aug. 1,1919; discharge for these periods based on observed gage height corrected for effect of logs by means of data collected at Sunkhaze Rips. Stage-discharge relation affected by ice Dec. 2,1919, to Apr. 13,1920. Discharge computations for this period based on gage heights corrected for effect of ice by means of six discharge measurements and other data collected at Sunkhaze Rips. Stage-discharge relation affected by log jams July 13 to Aug. 1,1920. Discharge for this period 'based on observed gage heights corrected for effect of logs by means of data at Sunkhaze. Intake pipe to well covered by debris Nov. 1-2, 6-14,16-30,1919; corrections for these periods based on data collected at Sunkhaze Rips. PENOBSCOT BIVER BASIN. 27 Monthly discharge o/Penobscot River at West EnfieU, Maine, for Ufa years ending Sept. SO, 1919 and mo. \ [Drainage area, 6,600 square miles.] Discharge in second-feet. * Run-off Month. Per in Inches. Maximum. Minimum. Mean. square mile. 1918-19. 28,600 11,100 15,000 2.27 2.62 40,400 10200 21,800 3.30 3.68 19,300 9,400 11,800 1.79 2.06 13,900 7,600 10,100 1.53 1.76 11,000 6,000 7,390n . 1.12 1.17 March ...... 42,200 6,300 18,200 2.76 3.18 43,400 22,800 33,400 5.06 5.65 May...... 43,700 22,500 32,600 4.94 5.70 June...... 25,800 7,200 12,800 1.94 2.16 July...... 7,440 5,200 6,140 .930 1.07 August...... 6.200 3,950 5,000 .758 .87 9,420 4,170 5,710 .865 .97 43,700 3,950 15,000 2.27 30.89 1919-20. October...... ;...... 8,120 4,500 5,820 .882 1.02 22,000 9,700 13,700 2.08 2.32 14,800 5,700 7,760 1.18 1.36 January ...... 6,000 4,500 5.260 .797 .92 5,000 4,100 4,630 .702 .76 March ...... 27; 300 4,100 7,370 1.12 1.29 April...... 71, 100 29,100 50,000 7.58 8.46 55,900 12,800 33,700 5.11 5.89 15.000 6,780 9,560 1.45 1.62 July...... 10,200 6,000 7,410 1.12 1.29 7^300 4,730. 6,050 .917 1.06 18,000 4,500 9,140 1.38 1.54 The year...... 71,100 4,100 13,300 2.02 27.53 2:8 SURFACE WATER SUPPLY, 1919-1920, PART I. EAST BRANCH OF PENOBSCOT RIVER AT GRINDSTONE, MAINE, LOCATION. At Bangor & Aroostook Railroad bridge half a mile south of railroad station at Grindstone, Penobscot County, one-eighth mile above Grindstone Falls, and 8 miles above confluence with West Branch at Medway. DRAINAGE AREA. 1,070 square miles; includes 240 square miles of Chamberlain Lake drainage (measured on map compiled by Maine Water Power Commission). RECORDS AVAILABLE. October 23,1902, to September 30,1920. GAGE. Chain attached to railroad bridge; read by R. D. Porter. DISCHARGE MEASUREMENTS. Made from railroad bridge. CHANNEL AND CONTROL. Practically permanent; stream confined by abutments of bridge and broken by one pier at ordinary stages; velocity of current medium at moderate and high stages but sluggish at low water. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 9.9 feet at 3 p. m. April 26 (discharge, 10,500 second-feet); minimum stage, 4.15 feet at 3.30 p. m. September 30 (discharge, 190 second-feet). Maximum stage recorded for the year ending September 30, 1920, 11.08 feet at 6.40 a. m. May 10 (discharge, 14,000 second-feet); minimum stage, 4.10 feet October 2-6 (discharge, 170 second-feet). 1902-1920: Maximum stage recorded at 5 p. m. September 29, 1909, 14.2 feet (discharge, from extension of rating curve, 23,800 second-feet); minimum open- water stage, 3.8 feet October 29-31, 1905 (discharge, 140 second-feet). Esti mated minimum discharge of 30 second-feet February 28, 1904, when stage- discharge relation was affected by ice. ICE. Ice forms to a considerable thickness at the gage and down to the head of Grind stone Falls, and although the falls usually remain open during the greater part of the winter, the stage-discharge relation is somewhat affected. REGULATION. Several dams maintained at outlets of a number of lakes and ponds near source of river are regulated for log driving; during the summer and fall gates are generally left open. The basin of the East Branch since about 1840 includes about 240 square miles of territory draining into Chamberlain Lake that formerly drained into the St. John River basin, the diversion being made through what is known as the Telos canal. Records not corrected for effect of storage and diver sions. ACCURACY. Stage-discharge relation occasionally affected by backwater from log jams at station and at Grindstone Falls immediately below, and by ice during winter. Rating curve well defined between 300 and 9,000 second-feet. Gage read to half-tenths October 1, 1918, to February 3, 1919, and to hundredths Feb ruary 4,1919, to September 30,1920; read once daily, except from October 1,1918, to August 25, 1919, when gage was not read on Sunday, and from January 1 to April 15, 1919, and December 4, 1919, to January 2, 1920, when it was read three times a week. Daily discharge ascertained by applying rating table to mean daily gage height, with corrections for effect of ice during the winter. Records good for moderate and high stages and fair for low stages. Discharge measurements of East Branch of Penobscot River at Grindstone, Maine, during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Bate. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Dec. 27 o6.72 2,260 Jan. 22 04.79 331 Mar. 18 ...do...... o5.65 490 1919. Apr. 21 ...do...... 8.46 6,140 Feb. 4 A. F.McAlary...... ;.. 05.47 813 Sept. 17 ...do...... 6.08 1,870 Mar. 7 ...do...... 05.37 630 15 ...do...... 05.58 720 Dec. 18 05.48 817 Stage-discharge relation affected by ice. PENOBSCOT EIVBE, BASIN. 29 Daily discharge, in second-feet, of East Branch of Penobscot River at Grindstone, for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1,280 4,650 1,800 1,550 740 560 6,400 8,550 5,000 1,670 905 440 2...... 1,340 3,860 1,750 1,550 780 600 5,340 8,400 3,670 1,670 620 415 3...... 1,160 3,600 1,650 1,450 780 700 4,820 9,000 3,490 1.600 620 415 4...... 1,280 3,490 1,600 1,450 820 740 4,300 8,700 3,490 1.600 620 415 5...... 1,400 3,320 1,550 1,400 820 700 3,860 8,400 3,490 1,600 590 365 6...... 2,600 3,160 1 450 1,400 3,760 9,000 3,160 1,530 560 315 7...... 4,050 2,700 1^450 1,350 780 620 3,670 8,700 3,300 1,460 860 315 8...... 3,670 2,550 1,400 1,300 . 780 4,160 8,400 3,450 1,400 860 500 9...... 3,160 2,400 1,350 1,200 740 660 4,650 7,250 3,670 1,400 500 10...... 3,160 2,300 1,350 1,200 74n 680 5,050 6,110 3,670 1,220 800 4M 11...... 2,700 2,250 1,300 1,200 660 780 5,450 5,700 3,490 1,160 730 440 12...... 2,550 2,180 1,300 1,150 580 900 5,850 5,340 3,490 1,100 730 500 l^...... 2.400 1,950 1,300- 1,150 580 860 6,000 5,340 3,160 1,100 730 950 14...... 2 V.fift 1,880 1 400 1 i NOTE. Stage-discharge relation affected by ice from Dee. 2,1918, to Mar. 29,1919, Nov. 24-28 and Dec. 4, 1919, to Mar. 26,1920. Discharge estimated for these periods on basis of gage heights corrected for effect of ice by means of discharge measurements, observer's notes, and weather records. Discharge estimated for Sundays between Oct. 1,1918, and Aug. 25,1919, and for a few other days when gage was not read. 30 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of East Branch of Penobscot River at Grindstone, Maine, for the years ending Sept. SO, 1919 and 1920. [Drainage area, 1,070 square miles.] Discharge in second-feet. Run-off Mouth. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 4,050 1,160 2,070 1.93 2.22 5,850 1,650 3,120 2.92 3.26 3,200 1,150 1,670, 1.56 1.80 2,100 740 1,160 1.08 1.24 820 540 641 .599 .62 March...... 7,500 560 2,050 1.92 2.21 April...... 10,500 3,670 6,490 6.07 6.77 Mav 9,000 3,670 6,660 6.22 7.17 5,000 1,880 3,000 2.80 3.12 July...... 1,950 690 1,100 1.03 1.19 905 340 599 .560 .65 950 190 414 .387 .43 The year...... 10,500 190 2,420 2.26 30.68 1919-20. 1,280 170 534 .499 .58 3,860 1,100 1,890 1.77 1.98 2,850 540 1,020 .953 1.10 540 260 371 .347 .40 340 230 263 .246 .27 March...... 6,930 200 1,410 1.32 1.52 April...... '...... 12,300 4,440 7,400 6.92 7.72 May...... 13,500 2,400 6,150 5.75 6.63 4,870 1,810 2,560 2.39 2.67 July...... 2,850 1,050 1,890 1.77 2.04 2,250 315 989 .924 1.07 3,490 470 1,250 1.17 1.30 The year ...... 13,500 170 2,140 2.00 27.28 MATTAWAMKEAG RIVER AT MATTAWAMKEAG, MAINE. LOCATION. At Maine Central Railroad bridge at Mattawamkeag, Penobscot County, half a mile above mouth of river. DRAINAGE AREA. 1,500 square miles. RECORDS AVAILABLE. August 26, 1902, to September 30,1920. GAGE. Chain fastened to railroad bridge; read by W. T. Mincher. DISCHARGE MEASUREMENTS. Made from the bridge; low-water measurements made by wading. CHANNEL AND CONTROL. Practically permanent; channel at bridge broken by two piers. EXTREMES OF DISCHARGE. Maximum stage recorded, for the year ending September 30,1919,10.1 feet at 5 p.m. March 31 and 7 a.m. and 5 p.m. April 1 and 2 (discharge 13,000 second-feet); minimum stage, 3.6 feet at 7 a.m. and 5 p.m. September 4 (discharge, 390 second-feet). Maximum stage recorded, for the year ending September 30, 1920, 14.0 feet at 8 a.m. April 18 (discharge by extension of rating curve, 25,600 second-feet); min imum discharge, 320 second-feet several days during February (stage-discharge relation affected by ice). 1902-1920: Maximum stage recorded, 14.0 feet April 18,1920 (discharge by ex tension of rating curve, 25,600 second-feet); minimum stage, 2.5 feet Oct. 4-12, 1905; Sept. 19 and Oct. 6, 1906; Sept. 24-29, 1908; and Oct. 14-17, 1910 (dis charge, 86 second.-feet). PENOBSCOT RIVER BASIN. 31 ICE. Stage-discharge relation usually affected by ice for several months each winter; KEOTLATION. Dams are maintained at outlets of several large lakes and ponds, but the stored water is used only for log< driving. ACCURACY. Stage-discharge relation occasionally affected by backwater from log jams and during winter by ice. Rating curve well defined between 500 and 1&,000 second-feet. During year ending September 30, 1919, gage read to tenths twice daily, except from January 10 to March 18, when it was read at irregular intervale. During the year ending September 30, 1920, gage read to quarter-tenths twice daily, except during the winter when it was read once daily. Daily discharge ascertained by applying rating table to mean daily gage height, with corrections for ice and other obstructions. Records good. Discharge measurements of Mattawamkeag River at Mattawamkeag, Maine, during the years ending Sept. 30, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Fed. Sec.-ft. 1919. Feet. Sec.-ft. Nov. 3 8.18 7 7ftfi «7.95 1,270 1919. 1920. Jan. 17 «8.42 1,290 .....do....:...... «5.79 383 Feb. 18 06.78 908 Feb. 28 .....do...... o6.50 355 Mar. 19 .....do...... «7.72 1 70ft Apr. 29 .....do...... 11.26 16,300 Sept. 14 65.70 2,240 Sept. 16 .....do...... 7.50 5,860 « Stage-discharge relation affected by ice. & Stage-discharge relation affected by fish dam. Daily discharge, in second-feet, of Mattawamkeag River at Mattawamkeag, Maine, for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Tan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 6,850 6,370 5,020 3,000 1.800 680 13,000 10,500 6,610 1,130 850 445 2...... 5,910 7,350 4,200 2 7rtfi 1,650 680 13,000 10,500 5,460 1,130 770 445 3...... 5,020 7,860 4,000 2,500 1,450 720 12,700 11,000 4,600 1,030 690 445 4...... 4,200 7,350 3 600 2 400 1,300 780 11.600 11,000 3,420 940 655 390 5...... 3,800 6,850 3,400 2 'vim 1,150 800 10,800 10,800 3,040 850 560 445 6...... 4,600 5,910 3,200 2,100 1,050 940 9,420 11,000 2,870 850 560 500 7...... 5,91fr 5,020 3,000 1 950 940 980 8 QAA 9,690 3,610 850 500 500 8...... 7,100 4,400 2,900 ijsoo din aofl 8,640 7,600 5,460 770 560 500 9...... 7,350 3,800 2,700 1,700 QAA Qfin S fun 6,850 5,910 850 560 500 10...... 6,850 3,420 2,500 1,650 QAA 1,050 8,900 6,140 5,460 810 560 500 11...... 6,370 3,230 2,400 1,550 840 9,160 6,140 4,810 770 560 500 12...... 5,910 S wn 2 Oflfl 1 Wl 840 1,550 9 JOA 6,370 4,600 770 500 530 13...... 5,460 3,040 2,300 1 450 840 1,550 10 800 5,460 4,200 770 445 985 14...... 4,600 2,700 2,200 1^400 840 1,550 ll!900 5,020 3,800 770 500 2,090 15...... 4,200 2 vtn 2 OOA 1 OCA 840 1 RK(\ 10 4AA 3,420 770 445 2,380 16...... 3,800 2,380 2,380 1 QAfl 780 1,550 4,200 3,230 850 500 2,090 17...... 3,420 2,230 2,700 1,300 840 1,650 12,400 4,000 3,420 810 500 1,630 18...... 3,040 2,380 3 040 1,300 QAA 1,700 12,400 770 500 1,180 19...... 2,700 5,680 3*420 1,250 840 1,800 12,200 5,240 3,040 770 .500 1,030 20...... 2,530 8,900 3,610 1,200 fiflfl 2 KAfl 11 600 5,680 2,870 770 500 895 21...... 2,700 11,000 3,420 1,200 780 2,700 11,000 5,460 3,230 690 500 810 22...... 3,420 11,600 2 0QA 1,150 7AA 2 QAA in t)f\(\ 5,020 3,420 560 730 23...... 3,800 11,600 2,090 1,150 620 3,400 9,420 4,600 3,230 590 560 850 24...... 4,200 11 000 2 OOA 1,100 600 5,200 8 640 5,910 2,380 445 500 985 25...... 3,800 10*200 3 040 1,100 560 6,400 9^420 4,810 1,820 560 500 1,030 26...... 3,420 8,900 3,800 1,550 600 9,700 11,600 5,460 1,510 560 500 1,030 27...... 4,000 7,860 4,000 3,400 660 10,200 11,000 8,900 1,450 500 445 1,030 28...... 4,200 6,850 4,000 2,900 680 10,500 11.000 10,800 1,450 560 445 1,030 29...... 4,200 6,140 3,800 2,400 11,000 10,200 10,500 1,340 620 445 1,030 30...... 4,000 5,680 3,400 2,300 ...... 12,200 10,200 9,160 1,230 730 445 895 31...... 4.600 3.200 1.950 11.900 7.860 850 445 32 SURFACE .WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Mattawamkeag River at Mattawamkeag, Maine, for the years ending Sept. 30, 1919 and 1920 Continued. ,, , :; , Day. , Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. :Aug; Sept. 1919-m 1...... 800 2,200 4,200 760 ^n 360 7 800 17,400 1,820 850 1,080 AQA 2...... 720 3,000 4 inn 700 OKA O^A s!200 16,400 1,280 850 1,030 730 3...... 690 2,800 4,200 680 OOA 340 8,600 16,400 1,030 895 1,030 770 4...... 690 3,000 4 AAA 620 39fl 360 9 000 15,400 810 QRK. 1 030 730 5...... V. 700 2,800 540 340 OQA 9^960 14,800 655 1,280 l'o30 850 6...... 7«A 3,100 3 OAA KAA OJfk 430 12 700 13 900 Q1A 1,280 1 030 940 7...... 1,150 3,700 3 JOA 600 330 490 11^300 1,180 ' PISOATAQUIS RIVER NEAR FOXCHOFT, MAINE. LOCATION. At highway bridge known as Lows Bridge, halfway between Guilford and Foxcroft, Piscataquis County, three-fourths mile above mouth of Plack Stream and 3 miles below Mill Stream. DRAINAGE AREA. 286 square miles. RECORDS AVAILAB&E. August 17, 1902, to September 30, 1920. GAGE. Staff attached to left abutment of bridge; read by A. F. D. Harlow. DISCHARGE MEASUREMENTS. At medium and high stages made from bridge; at low stages made by wading. CHANNEL AND CONTROL. Practically permanent; banks are high and are overflowed only during extreme floods. EXTREMES OP DISCHARGE. Maximum open-water stage recorded for the year ending September 30, 1919, 7.0 feet at 7 a. m. March 29 (discharge, 4,350 second-feet); (a stage of 7.7 feet was recorded at 5.30 p. m. March 24, but the water was held back by an ice jam); minimum stage 1.8 feet several times during July and August (discharge 40 second-feet). Maximum stage recorded for the year ending September 30, 1920, 9.7 feet at 4 p. m. April 14 (discharge, by extension of rating curve, 7,600 second-feet); minimum discharge 10 second-feet March 4 (stage-discharge relation affected by ice). 1902-1920: Maximum stage recorded, 14.3 feet at 6.30 p. m. September 29, 1909 (discharge by extension of rating curve, 21,700 second-feet); minimum dis charge, 5 second-feet August 6, 1905, and November 22, 1908 (water held back by dams). ICE, -Stage-discharge relation affected by ice during winter. REGULATION. The stream is used to develop power at several manufacturing plants above the station; distribution of flow somewhat affected by operation of wheels. ACCURACY. Stage-discharge relation occasionally affected by backwater from log jams and by ice during winter. Rating curve well defined between 20 and 3,000 second-feet. Gage read to tenths twice daily. Daily discharge ascertained by applying rating table to mean daily gage height, with corrections for effect of ice during the winter. Some uncertainty exists in regard to the effect of diurnal fluctuation. Records fair. Discharge measurements of Piscataquis River near Foxcroft, Maine, during the years ending Sept. 30, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by £&. charge. " 1918. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Oct. 29 3.40 645 Jan. 23 83.76 153 29 .....do...... 3.40 651 Mar. 19 .....do...... o4.48 274 Nov. 19 .....do...... 5.67 2,820 Apr. 28 .....do...... 5.03 2.200 Sept. 20 .....do...... 2.53 222 1919. Jan. 23 F.A.Dolloff...... "3.12 204 Feb. 25 .....do...... »3.05 226 Mar. 24 "6.17 2,840 Apr. 1 .....do...... 4.33 1,450 a Stage-discharge relation affected by ice. 102721 23 WSP 501 3 34 SURFACE WATEE SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Piscataquis River near Foxcroft, Maine, for the years ending Sept. 30, J919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 500 1,800 640 300 720 200 1,900 2,320 570 175 175 120 2...... 470 1,330 570 240 580 240 1.330 2,100 440 120 90 120 3...... 380 1,060 605 120 500 410 1,240 2,320 380 120 64 110 4...... 410 880 800 220 300 380 1,060 2,210 380 110 80 80 5...... 800 640 680 240 360 240 1,010 1,800 470 90 145 80 6...... 1,510 640 640 280 380 380 1,010 1,600 720 80 132 51 7...... 3,420 640 640 240 330 470 1,420 1,330 720 190 120 51 8...... 1,700 640 570 240 300 260 2,000 1,150 925 240 , 90 57 9...... 1,330 570 570 240 260 260 1,900 1, 150 640 205 40 175 10...... 1,060 570 570 200 200 540 f,900 1,060 720 175 40 110 11...... 880 640 500 200 380 640 1,600 720 640 132 57 222 12...... 605 605 470 175 380 640 2.760 640 330 80 80 260 13...... 500 720 440 200 410 570 3,530 570 260 40 64 605 14...... 440 500 440 200 240 570 3,420 500 240 51 72 570 15...... 440 570 500 190 200 570 2,760 440 280 160 90 720 16...... 470 440 570 220 220 500 2,430 410 280 145 51 720 IT.....:...... 410 440 570 240 220 380 2,100 605 240 120 64 680 18...... 500 970 500 200 200 380 2,000 1,800 205 64 80 240 19...... 535 2,760 640 120 190 680 2,100 2,540 175 46 64 175 20...... 640 2,760 500 145 190 1,300 2,320 1,510 145 40 132 110 21...... 880 3,640 440 220 160 1,800 2,100 880 145 51 ; 120 51 22...... 840 2,870 355 190 160 3,100 1,800 970 145 90 120 90 23...... 605 2,100 640 200 160 2,650 1,700 3,6,40 145 120 120 90 24...... 470 1,600 800 570 190 2,850 1,900 348iQ 145 90 120 90 25...... 440 1,330 640 2,200 190 3,090 2,100 2,000 145 t 64 132 90 26...... 440 1,240 640 2,200 220 2,000 2,000 2,100 145 46 no 132 27...... 640 760 605 1,600 240 2,100 1,900 175 40 .110 120 28...... 680 800 .500 1,400 240 2,100 1*900 1,900 240 145 MO 120 29...... 640 720 410 880 4,230 l'900 1,330 175 205 90 120 30...... 1,240 720 330 720 2,540 2,540 605 175 240 80 120 3L...... 2,540 280 680 1,900 680 240 80 1919-20. 1...... 51 1,330 1,150 280 12 130 2,400 2,760 380 40 51 86 2...... 40 1,240 1,420 130 100 24 1,500 2,320 380 40 59 86 3...... 40 840 925 125 80 24 1,250 2,210 380 69 86 96 4...... 40 720 640 94 80 10 1,350 2,000 380 190 169 116 5...... 51 720 640 94 80 22 1,150 2,000 380 260 154 106 6...... 240 880 570 115 64 22 4,400 2,100 380 240 154 106 7...... 500 840 380 105 64 145 5,600 2,100 380 205 154 330 8...... 355 760 500 100 36 190 3,600 2,100 380 190 77 410 9...... 205 570 440 78 Qfi 72 2,800 5,070 330 106 77 280 10 280 535 AAf\ 70 40 72 2,320 4,590 299. 86 77 260 11...... 800 380 440 18 46 58 1,900 2,540 280 69 69 222 12...... 380 500 440 105 58 145 2,320 2,210 280 69 69 240 13...... 355 1,060 535 70 46 80 2,430 1,900 280 69 190 355 14...... 280 1,510 380 68 28 190 7,430 1,900 240 69 305 410 15..,...... 280 1,240 440 66 46 300 5,430 1,900 240 69 305 330 16...... 260 925 440 66 80 360 4,350 1,330 240 69 240 260 17...... 280 800 410 66 58 240 4,110 1,330 240 69 280 260 18...... 222 760 380 15 36 200 3,750 1,150 240 69 305 190 19...... " 380175 720 380 3S 31 240 2,650 880 175 154 260 190 20...... ;... 720 330 50 31 160 3,420 880 175 128 190 190 21...... 260 640 220 96 28 120 3,750 880 120 74 169 154 22...... 222 640 330 Oft in 145 3,'750 880 100 74 154 154 23...... 260 640 280 94 58 150 3,530 840 205 69 169 106 24...... 3SO 970 300 105 58 200 3,420 800 145 69 169 106 25...... 240 720 300 12 50 260 3,200 800 100 86 190 106 26...... 205 640 360 40 80 280 2,650 640 64 86 190 106 27...... 380 640 200 80 fid. 340 2,100 605 31 77 190 106 28...... 380 570 320 80 28 1,050 2,320 570 31 77 140 106 29...... 330 500 280 80 46 2,400 4,230 500 64 n V^ISS 40 30...... 305 640 280 80 2,400 3,200 500 80 59 128 92 31...... 280 OCfl 80 2,400 380 59 128 NOTE. Stage-discharge relation affected by ice from Dec. 30,1918, to Mar. 24,1919, and from Dec. 15,1919, to Apr. 9, 1920; discharge estimated for these periods on basis of gage heights corrected for effect of ice by means of discharge measurements, observer's notes, and weather records. PENOBSCOT KIVEE BASIN, Monthly discharge of Piscataquis River near Foxcrjft, Maine, for iheyexrs ending Sept. 30, 1919 and WW. [Drainage area, 286 square miles.] Discharge in second-feet. Run-off, Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 3.420 380 852 2.9S 3.44 3,640 440 1,170 4.09 4.56 800 280 550 1.92 a 21 2,200 120 486 1.70 1.96 720 160 290 1.01 1.05 4,230 200 1,220 4.27 4.92 April...... 3,530 1,010 1,990 6.98 7.78 May...... 3,640 410 1,460 /5.10 5.88 925 145 316 f 1.21 1.35 July...... 240 40 120 .420 .48 175 40 94.3 .330 .38 720 51 209 .731 .82 4,230 40 733 2.56 34.81 1919-20, , 800 40 273 .955 1.10 November...... 1,510 380 788 2.76 3. OS 1,420 200 465 1.63 1.88 280 12 83.7 .293 .34 100 12 52.3 .183 .20 March...... 2,400 10 401 1.40 1.61 April...... 7 430 1,150 3,210 11.20 12.56 May...... 5,070 380 1,630 5.70 6.57 380 31 233 .815 .91 July...... 260 40 98.9 .346 .40 305 51 162 .566 .65 410 40 187 .654 .73 7,430 10 630 2.20 30.03 PLEASANT RIVER AT HILO, MAINE. LOCATION. At highway bridge known locally as Snow's Bridge, in Milo, Piscataquia County. DRAINAGE ABBA. 325 square miles (measured on map compiled by Maine Water Power Commission). RECORDS AVAILABLE. June 4 to September 30, 1920. GAGE. Vertical staff on downstream side of right bridge abutment; read by H. S. Snow. DISCHARGE MEASUREMENTS. Made from downstream side of bridge, CHANNEL AND CONTROL. Channel of coarse gravel. Control for low stages is a well-defined riffle 100 feet below the gage; control at high stages formed by a series of riffles extending about a mile below the gage. EXTREMES OP DISCHARGE. Maximum stage recorded during period of record, 3.90 feet at 5.15 p. m. June 8 (discharge, 1,470 second-feet); minimum stage, 2.30 feet July 30, 31 (discharge, 77 second-feet). ICE. Stage-discharge relation affected by ice during the winter. REGULATION. The flow is partly regulated by a power development at Brownville and by storage dams at the headwaters which are used during the log-driving season. ACCURACY. Eating curve fairly well defined between 150 and 1,200 second-feet. iGage read to half-tenths twice daily. Daily discharge ascertained by applying rating table to mean daily gage height. Records good. 36 SURFACE WATER SUPPLY, 1919HL920, PART I. Discharge measurements of Pleasant River at Milo, Maine, during the year ending Sept. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by- height. charge. Feet. Sec.-ft. Feet. Sec.-ft. J.W.Moulton...... 3.42 832 July 22 2.62 216 .....do...... 2.53 Sept. 18 3.53 978 Daily discharge, in second-feet, of Pleasant River at Milo, Maine, for the year ending Sept. 30, 1920. Day. June. July. Aug. Sept. Day. June. July. Aug. Sept. 1...... 202 202 257 16...... 337 207 274 880 2...... 196 217 240 17...... 311 202 434 685 3...... 217 217 217 18...... 286 155 385 640 4...... 207 234 223 19...... 274- 186 337 930 5...... 685 364 364 135 20...... 269 223 257 560 ^:...... 990 730 280 150 21...... 274 217 286 ' 490 7...... 1.180 357 274 223 22...... 685 223 257 434 8...... 1,180 299 223 560 23...... 640 217 640 420 9...... 990 600 228 880 24...... 228 175 730 350 10...... 1,120 364 202 476 25...... 217 455 337 11...... 525 286 196 490 25...... 455 175 420 299 12...... 730 274 234 455 27...... 560 186 350 324 13...... 420 434 269 780 28...... 186 175 337 299 14...... 378 263 990 1,180 29...... '... 186 155 286 202 15...... 350 202 406 1,180 30...... 180 125 274 434 31...... 125 263 Monthly discharge of Pleasant River at Milo, Maine, for the year ending Sept. SO, [Drainage area, 325 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1.180 180 524 1.61 1.56 July...... 730 125 256 .788 .91 990 196 339 1.04 1.20 1,180 135 491 1.51 1.68 FEBTOBSCOT RIVER BASIN. 37 PASSADTJMKEAG RIVER AT LOWELL, MAINE. LOCATION. About 400 feet below dam and highway bridge at Lowell, Penobscot County, and 10 miles above mouth of river. DRAINAGE ABBA. 301 square miles. RECORDS AVAILABLE. October 1,1915, to September 30,1920. GAGES. Chain and staff gages on left bank; from October 1, 1915, to September 30, 1917, chain and staff gages on right bank half a mile below the highway bridge; read by F. A. Lord. Staff above dam for supplementary use during winter. Gages set at different datums. DISCHARGE MEASUREMENTS. Made from cable near gage. CHANNEL AND CONTROL. Channel rough and somewhat irregular; control about 100 feet below gage; practically permanent. EXTREMES OF DISCHARGE. Maximum open-water stage recorded for the year end ing September 30, 1919, 3.35 feet at 7.30 a. m. November 21 and 8 a. m. March 31 (discharge, 1,550 second-feet) (a stage of 3.75 feet was recorded at 9 a. m. January 13, but the stage-discharge relation was affected by ice); minimum stage, 1.28 feet at 9.30 a. m. September 1 (discharge, 95 second-feet). Maximum stage recorded for the year ending September 30, 1920, 4.80 feet April 19, 20, 21 (discharge, 3,390 second-feet); minimum discharge, 95 second-feet by current-meter measurement January 21. 1916-1920: Maximum stage recorded, 4.80 feet April 19, 20, 21,1920 (discharge, 3,390 second-feet); minimum discharge in 1919 and 1920. ICE. Stage-discharge relation usually affected by ice from December to April. REGULATION. Distribution of flow somewhat affected by use of storage reservoirs above station. A small dam and mill 400 feet above the gage cause fluctuations in stage for a short time each day when mill is in operation. Mill used little if any during 1920. ACCURACY. Stage-discharge relation practically permanent, except when affected by backwater owing to logs on control or to ice. Gage read to quarter-tenths once daily. Rating curve well defined between 90 and 2,500 second-feet. Daily discharge ascertained by applying rating table to gage height, with corrections for effect of ice and log jams. Records fair. COOPERATION. Several discharge measurements furnished by T. W. Clark, hydraulic engineer, Old Town, Maine. ' » Discharge measurements of Passadumkeag River at Lowell, Maine, during the years ending Sept. 30, 1919 and 1920. ' Gage Dis Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1920. Feet. Sec.Jt. Dec. 20 02.75 S26 Feb. 26 J. W. Moulton...... o2.81 116 July 27 2.08 428 1920, Aug. 6 ..... Stage-discharge relation affected by ice. 38 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Passadumkeag River at Lowell, Maine, for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 800 845 669 480 570 250 1,440 1,120 845 430 194 95 2...... 756 868 630 461 550 230 1,490 1,170 690 430 203 99 3...... 935 800 496 444 496 203 1,440 1,170 669 400 203 99 4...... 935 800 496 440 480 250 1,490 1,170 628 400 194 111 6...... 890 800 428 410 444 280 1,380 1,170 513 400 178 119 6...... 712 778 444 410 412 300 1,380 1,170 500 380 178 124 7...... 980 734 410 410 410 330 1,330 1,170 500 380 163 137 8...... 1,070 712 382 410 410 353 1,380 1,170 500 380 156 137 1,020 669 382 410 410 350 1,380 1,170 530 380 156 137 10...... 1,020 628 380 400 410 428 1,330 1,120 530 380 150 137 11...... 756 608 380 380 400 460 1,270 1,070 530 380 156 137 12...... 935 588 353 370 380 460 1,220 1,220 530 380 156 137 13...... 935 550 326 370 370 460 1,330 1,070 530 350 150 212 14...... 935 513 313 370 367 460 1,220 1,100 530 350 145 300 15...... 800 496 340 370 300 480 1,170 1,040 530 350 137 412 16...... 800 478 382 370 300 480 1,170 822 530 350 129 412 17...... 756 478 "444 370 313 496 1,270 1,070 530 350 124 397 18...... 756 496 590 370 310 461 1,440 1,070 532 350 119 353 19...... 712 756 550 370 313 550 1,330 1,270 550 350 119 300 20...... 712 1,020 510 370 300 734 1,330 1,170 550 350 119 264 21...... 669 1,550 461 350 290 1,070 1,270 1,020 532 330 124 222 22...... 712 1,270 444 350 287 1,120 1,220 756 444 330 124 194 OO 712 1.380 461 353 212 1,240 1,020 822 478 330 124 194 24...... 712 1,220 531 461 252 1,380 935 935 478 330 119 186 25...... 669 1,170 590 590 250 1,640 1,000 845 513 330 119 194 26...... 669 1,070 590 760 250 1,330 980 845 428 300 111 178 27...... 669 980 588 760 250 1,330 980 980 430 242 111 178 28...... 669 890 569 690 250 1,360 980 980 430 210 104 163 29...... 669 900 510 648 1,490 1,000 958 430 178 104 163 30...... 669 756 480 610 1,490 1,020 845 430 178 99 150 31...... 756 480 588 1,550 890 203 99 1919-20. 1...... 137 275 353 145 98 120 1,170 2,740 1,070 412 252 150 2...... 124 353 478 140 98 120 1,170 2,740 1,070 382 231 160 3...... 124 412 588 135 98 120 1,170 2,610 980 412 212 150 4...... 119 412 669 125 98 120 1,170 2,480 980 353 ' 150 150 6...... 119 444 478 120 98 115 1,170 2,220 940 444 178 150 6...... 124 588 412 120 95 115 1,380 1,710 940 513 178 150 7...... 145 669 353 120 96 115 1,830 1,960 900 588 150 150 8...... 178 712 300 120 98 115 1,710 1/600 900 550 129 212 9...... 212 712 280 120 98 115 1,710 1,830 840 550 178 250 10...... 231 712 275 120 > 98 115 1,600 1,830 800 550 178 270 11...... 252 712 270 120 100 125 1,600 1,960 780 478 163 290 19 252 588 270 115 100 200 1,600 1,830 800 478 124 290 13...... 252 444 280 115 105 340 1,600 1,830 890 478 137 300 14...... 252 412 300 110 105 430 2,220 1,710 800 412 150 350 15...... 252 412 290 110 110 470 2,480 1,600 712 412. 163 620 16...... 231 444 270 110 110 450 2,610 1,830 669 382 163 800 17...... 194 478 240 105 115 410 2,870 1,710 478 353 ' 178 1,150 18...... 178 513 220 100 115 350 3,130 1,600 669 326 178 1,050 1Q 163 550 100 115 260 3,390 1,600 756 326 178 1,050 20...... 163 550 200 100 120 195 3,390 1,490 669 382 150 980 21...... 163 444 200 100 120 280 3,390 1,490 600 412 137 900 22...... 178 353 200 98 120 220 3,130 1,490 440 478 137 78 0 23... V...... 150 326 190 98 120 230 3,130 1,380 460 478 163 680 24...... 150 300 185 98 125 270 3,130 1,380 460 478 163 600 25...... 137 300 180 96 125 300 3,000 1,270 460 478 '178 500 26...... 137 300 180 96 120 353 3,000 1,270 444 444 178 430 27...... 137 300 175 96 120 412 2,870 1,170 412 412 178 370 28:...... 275 175 96 120 550 1,170 353 382 q-ifl 29...... ' 178 252 165 OR 120 712 2,740 1,070 412 353 163 300 30...... 212 300 155 96 980 2,610 1,120 412 300 150 280 31...... 212 150 98 1,070 1,070 275 1 NOTE. Stage-discharge relation affected by ice Dec. 2, 7,10,11.18-20, 26, 29-31,1918; Jan. 1,4-22. 25-28, 30,1919; Feb. 1, 4, 7-13, 18, 20 21, 25-28, 1919; and March I, 2, 4-7, 9, 11-16,1919. Discharge estimatedfor these periods on basis of gage heights corrected for effect of ice by means of one discharge measurement and gage heights at dam. Corrections made for operation of gatas July 21, 26, 28, 1919; and for log jams Mar 3-10, 17-20,1919; June 6-17, 26-30, 1919; and July 1-20, 22-25, 1919. Stage-discharge relation affected by ice Dee. 9,11-13,1919; and Dec. 15,1919, to Mar. 24,1920, and by logs June 5-12. 21-25,1920, and Sept. 9-30,1920. Discharge estimated from gage heights corrected for efiect y ice and logs, by discharge measurements, observer's notes, and climatic records. PENOBSCOT RIVER BASIN. Monthly discharge of Passadumkeag River at Lowell, Maine, for the years ending Sept, 30, 1919 and 1920. [Drainage area, 301 square miles.] Discharge in second-feet. Kun-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 1,070 669 800 2.66 3.07 1,550 478 823 2.73 3.05 669 313 471 1.56 1.80 760 350 456 1.51 1.74 February ...... 570 212 357 1.19 1.23 March...... 1,550 203 736 2.45 2.83 April...... 1,490 935 1,240 4.12 4.60 May...... 1,270 756 1,040 3.46 3.99 845 428 528 1.75 1.95 July...... 430 178 338 1.12 1.29 203 99 141 .468 .54 September...... 412 95 198 .658 .73 1,550 95 595 1.98 26.82 1919-20. 252 119 177 .584 .67 712 252 451 1.50 1.67 669 150 280 .930 1.07 145 96 110 .365 .42 125 98 109 .362 .39 Mareh...... ;...... 1,070 115 315 1.05 1.21 Aferil...... 3,390 1.170 2,290 7.61 8.49 May...... 2,740 1,070 1,700 5.65 6.51 1,070 353 703 2.34 2.61 July...... 588 275 428 1.42 1.64 252 124 169 .561 .65 1,150 150 460 1.53 ,1.71 3,390 96 598 1.99 27.04 KENDTTSKEAG STREAM NEAR BANGOR, MAINE. LOCATION. At highway bridge at Sixmile Falls, 6 miles northwest of Bangor, Pen- obscot County, and 7 miles below mouth of Black Stream. DRAINAGE AREA. 191 square miles. At high stages a part of the water of Souadabs- cook Stream finds its way through an artificial cut into Black Stream and thus to the Kenduskeag. ' RECORDS AVAILABLE. September 15, 1908, to September 30, 1919, when station was discontinued. GAGE. Chain attached to bridge; read by Fred Cort. DISCHARGE MEASUREMENTS. Made from the bridge. CHANNEL AND CONTROL. Practically permanent; channel broken by one pier at the bridge. EXTREMES OP DISCHARGE. Maximum stage recorded during year, 8.4 feet on March 23 (discharge, 4,040 second-feet); minimum stage recorded, 1.4 feet several times in August (discharge, 11 second-feet). 1908-1919: Maximum stage recorded, 10.3 feet at 6.20 p. m. April 15, 1909 (discharge, by extension of rating curve, 6,130 second-feet); minimum stage recorded, 1.30 feet September 15 to October 1, 1908, and October 11-16, 1914 (discharge, 7 second-feet). ICE. Stage-discharge relation seriously affected by ice for several months. DIVERSIONS. An artificial cut was made for log driving through a low divide between Souadabscook Stream and Black Stream, which enters the Kenduskeag about 7 miles above the gaging station. During high stages of the Souadabscook part of its waters finds its way through the artificial cut into the Kenduskeag; at low stages of the Souadabscook all the flow continues down its own channel; Black Stream probably sends its waters only to the Kenduskeag. 40 SURFACE WATER SUPPLY, 193.9-1920, PART I. ACCURACY. Stage-discharge relation remained permanent during the year except during ice periods. Eating curve well defined below 3,600 second-feet. Gage read to tenths twice daily during open-water period; read three times a week from December 25 to March 26. Daily discharge ascertained by applying rating table to mean daily gage height with corrections for effect of ice. Records good. Discharge measurements of Kenduskeag Stream near Bangor, Maine, during the year ending Sept. SO, 1919. Gage Dis Date. Made by height. charge. Feet. 3ec.-ft. Jan. 22 P. A. Dolloff...... o2.80 72 Feb. 19 .....do...... o2.81 72 a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Kenduskeag Stream near Bangor, Maine, for the year ending Sept. SO, 1919. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. ^ay. June. July. Aug. Sept. 1...... 655 1,420 538 840 460 84 1,680 740 311 76 33 29 2...... 538 1,240 463 660 419 108 1,360 815 280 84 33 28 3...... 538 890 427 360 380 100 1,060 890 206 91 29 23 4...... 538 695 375 360 360 130 890,. 170 99 37 20 5...... 790 538 343 300 340 140 790 890 206 107 26 26 6...... 1,610 538 265 300 310 140 790 695 265 76 23 23 7...... 2,650 463 230 300 310 140 695 538 250 84 20 29 8...... 2,370 463 210 260 250 160 695 463 234 61 23 29 9...... 1,890 427 180 260 220 210 655 375 206 69 23 26 10...... 1,240 409 160 260 195 410 695 327 181 99 1? 26 11...... 890 359 140 260 170 700 740 296 159 107 17 33 12...... 615 311 140 200 150 700 . 840 280 150 107 17 37 13...... 615 265 140 160 150 740 1,060 234 159 91 17 69 14...... 538 193 140 170 130 620 1,008 '250 131 84 14 140 15...... 463 170 160 18ft 100 540 1,000 343 115 107 11 181 16...... 463 206 180 150 100 460 1,000 343 123 107 17 150 17...... 500 '265170 180 160 84 430 1,120 359 107 99 17 115 18...... 538 180 150 84 660 1,090 576 91 167 14 99 19...... 576 1,120 180 lid 84 1,200 790 1,360 76 91 14 84 20...... 615 2,290 180 115 68 3,500 655 1,180 76 76 20 54 21...... 1,180 2,370 180 105 68 3,300 538 1,120 61 61 23 54 22...... 1,360 1,970 260 84 68 3,600 463 1,120 76 61 17 76 23...... 1,180 1,610 360 76 68 4,040 427 1,120 69 61 23 91 24...... 1,000 1,300 840 430 84 3,380 463 1,000 61 69 23 69 25...... 840 1,120 620 1,250 68 2,750 463 1,000 61 68 20 69 26...... 695 1,060 580 1,750 68 2,130 500 890 54 42 23 «1 27...... 615 890 500 1,600 68 1,820 538 740 84 42 23 61 28...... 615 655 500 1,050 68 1,610 463 615 91 42 20 61 29...... 588 500 500 800 1,970 500 538 107 33 17 54 30...... 538 500 500 500 2,460 695 463 91 42 20 48 31...... 1,120 620 310 2 7W 463 48 23 NOTE. Stage-discharge relation affected by ice Dec. 7 to Mar. 21; discharge estimated for this period on basis of gage heights corrected for effect of ice by means of two discharge measurements, observer's notes, and weather records. KENNEBEC BIVEB BASIN. 41 Monthly discharge of Kenduskeag Stream near Banger, Maine, for the year ending Seph SO, 1919. [Drainage area, 191 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. 'Ml'nJTnttTn, Mean. square mile. October...... 2,650 463 913 4.78 5.51 2,370 170 814 4.26' 4.75 December ...... 840 140 331 1.73 1.99 1.750 76 437 2.29 2.64 February...... 460 68 176 .921 .96 4.040 84 1,320 6.91 7.97 April...... 1,680 427 786 4.12 4.60 May...... 1,360 234 , 678 3.55 4.09 311 61 142 .743 .83 July...... 107 33 77.2 .404 .47 August ...... 33 11 21.1 .110 .13 181 20 62.1 .325 .36 The year...... 4,040 11 483 2,53 34.30 KENNEBEC RIVER BASIN. MOOSE RIVER NEAR ROCKWOOD, HAUTE. At Walter Scott's camp, 2 miles above Moosehead Lake aad 4 miles west of Kineo station and Rockwood post office, Rockwood Township, Somerset County. DRAINAGE ABBA. 708 square miles (revised from map compiled by Maine Water Power Commission). RECORDS AVAILABLE. September 7, 1902, to December 31, 1908; May 16, 1910, to September 18, 1912; November 1, 1919, to September 30, 1920. SAGE. Staff gage in three sections on right bank about 100 feet above Walter Scott's camp. Upper and lower sections vertical; middle section inclined; read by John King. DISCHARGE MEASUREMENTS. Made from cable or by wading. High-water measurer ments during year ending September 30, 1920, made from highway bridge 1.4 miles below gage. CHANNEL AND CONTROL. Bed consists of ledge rock and gravel. Control well defined and fairly permanent. Stage-discharge relation affected by high water in Moose- head Lake. EXTREMES OF DISCHARGE. Maximum open-water stage recorded during year, 7.9 feet, May 11-14, but stage-discharge relation was affected by high water in Moose- head Lake (discharge estimated 6,200 second-feet). Maximum open-water stage without backwater effect 7.5 feet May 4-8 (discharge, 6,000 second-feet). Minimum discharge estimated 145 secoad-feet several days in March when the stage-discharge relation was affected by ice. 1902-1908; 1910-1912; 1920: Maximum stage recorded, 9.2 feet May 2, 1908 (discharge by extension of rating curve, 6,750 second-feet); minimum stage recorded, 1.30 feet December 16, 1903 (discharge by extension of rating curve, 70 second-feet). ICE. -River usually freezes over and the stage-discharge relation is affected by ice. REGULATION. During April, May, and June the operation of Long Pond for log driving causes a small diurnal fluctuation. ACCURACY. Stage-discharge relation affected by high-water in Moosehead Lake from May 8 to June 13 and during the winter by ice. Present rating curve well defined between 100 and 4,000 second-feet. Gage read to half-tenths once a day. Daily discharge ascertained by applying daily gage height to rating table with corrections for effect of ice and backwater from Moosehead Lake. Records fair. 42 SURFACE WATER SUPPLY, 191&-1920, PART I. Discharge measurements of Moose River near Rockwood, Maine, during the year ending Sept. so, 19^0. [Made by J. W. Moulton.] Dis Dis Gage Dis Date. height. charge. Date. &, charge. Date. height. charge. Feet. Sec.-ft. Feet. Sec.-ft. Feet. Sec.-ft. 4.90 2<>fifl Jan. 14...... a2.14 ~ 296 7.00 5.210 3.55 Q94 01.82 160 May 21...... 6.45 4,140 « Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Moose River near Rockwood, Maine, for the year ending Sept. SO, 1920. Day. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July.' Aug. Sept. 1...... 1,600 1,300 270 210 145 1.490 5,520 2,900 1,690 700 206 2...... 1,590 1,300 270 210 145 1.590 5,680 2,400 1,690 590 239 3...... 1,910 1,300 270 190 145 1,590 5,840 2,400 1,690 590 239 4...... 2,260 1,300 270 190 145 1,690 6,000 3,500 1,690 700 239 5...... 2,260 1,300 270 190 145 1,690 6,000 2,400 1,590 640 239 6...... 2,260 1,300 270 190 145 2,500 6,000 3,300 1,590 590 272 7...... 2,380 1,300 270 175 145 2,500 6,000 3,300 1,590 590 272 8...... 2,380 1,300 270 175 145 2,500 6,000 3,300 1,490 590 239 9...... 2,140 1,300 260 17^ 155 2,620 6,000 3,000 640 239 10...... 2,140 890 260 160 170 2,750 6,000 2,900 640 ewS 272 11...... 2,260 ft4rt 260 160 toe 2,880 6,200 2,90a 890 239 272 12...... 2,380 590 260 1 ftfi 200 3,420 6,200 2,800 820 590 270 13...... 2 OQft KQA i f»n 206 3,700 6,200 2,600 640 239 270 14...... 2 0QA RAf\ 260 150 206 4,000 6,200 i cjftn 820 239 270 15...... 2,380 KOA OAA 1 f»rt 208 4,300 6,000 1,910 640 239 270 16...... 2,260 470 260 150 208 4,900 6,000 1,800 700 208 270 17...... 2,140 450 260 160 208 4,900 6,000 1,690 590 206 270 18...... 2,020 430 260 1 ^fl 999 4 Qfln 1,690 590 206 270 19...... 2,380 410 240 150 255 5,050 5,800 1,390 590 206 272 20...... 2,380 410 240 155 222 5,200 5,800 1,300 640 206 239 21...... 2,380 370 240 155 222 5,200 4,100 1,210 640 206 239 22...... 2,380 340 155 590 5,200 4,900 1,120 590 206 239 23...... 2,260 340 240 1 f»rt 615 5,200 4,800 1,120 590 208 206 24...... 2,500 320 230 150 615 5,200 4,300 890 590 206 206 25...... 1,910 300 230 1 w 670 4,750 4,100 890 730 206 206 26...... 1,800 290 220 150 590 5,200 3,800 890 700 208 206 ,27...... 1,690 270 210 1 *tft 615 5,200 3,500 2,880 640 206 206 28...... 1,690 290 210 150 590 5;360 3,300 2,620 640 305 206 29...... 1 300 270 OtA i jyi 640 5,360 3,200 2,380 640 395 206 30...... l'300 290 91 ft 640 5,520 3,000 2,020 760 272 210 31...... 270 210 1 onn 3 nnft 700 239 NOTE. Stage-discharge relation affected by ice Dec. 14 to Mar. 12, and by backwater from Moosehead Lake May 9 to June 13. Discharge estimated Nov. 1, Sept. 12-18, and 30. >..!' Monthly discharge of Moose River near Rockwood, Maine, for the year ending Sept. SO, [Drainage area, 708 square miles.] Discharge in second-feet. Run-off Month. Per in inches. MaxiEttum. Minimum. Mean. square mile. November...... 2,500 1,300 2.100 2.97 a. 31 1,300 270 677 .956 1.10 270 210 248 .350 .40 210 150 164 .232 .25 1,300 145 345 .487 .56 5,520 1,490 3,8$) 5.48 6.11 May...... 6,200 3,008 5,200 7.34 8.46 June...... 3,500 890 2,170 3.06 3.41 July...... 1,690 590 917 1.30 1.50 700 206 346 .489 .56 272 206 242 .342 .38 KENNEBEC KIVEK BASIN. 43 MOOSEHEAD LAKE AT EAST OUTLET, MAINE. LOCATION. At wharf at east outlet of lake, 8 miles from Kineo, Piscataqiris County. DRAINAGE AREA. 1,240 square miles. RECORDS AVAILABLE. April 1,1895, to September 30, 1920. GAGE. Staff at end of boat landing; two datums have been used at east outlet; the first (or original datum) is 1,011.20 feet above mean sea level and approximately 10 feet below sills of outlet gates; gage is read to this datum; the second, to which all gage readings published to and including 1911 have been referred, is 10 feet higher; that is, the zero is at the sill of the gates; as it is believed that low water may go below the sill of the gates (zero of second datum), gage heights since 1912 are published as read, that is, to original datum. REGULATION. The lake is regulated to a capacity of 23,735 million cubic feet. The dam at the east outlet is controlled by 39 gates, the sills of the gates being at elevation varying from 8 feet to 11.4 feet. At extreme low stages the flow from the lake is controlled not by the gates but by a bar above the dam at an approxi mate gage height of 9 feet. The records show only fluctuations in the level of the lake and are used in the studies of regulation of the lake and in computing the natural flow of the Kennebec at The Forks. COOPERATION. Record furnished by Hollingsworth & Whitney Co. Daily gage hei\ :, in feet, of Moosehead Lake at east outlet, Maine, for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 16.45 16.9 15.8 14.05 2...... 17.0 146 17.2 3...... 14.7 14.3 147 i7.5 140 4...... 14.7 16.7 17.45 15.8 17.2 15.7 5...... 15.7 14.3 17.5 ie.7 13.9 6...... 16.9 17.0 17.3 16.8 15.55 7...... 15.05 17.45 15.6 14.2 1495 17.5 16.6 8...... 17.05 1ft Q 15.5 9...... 15.1 17.3 15.1 17.5 17.1 16.6 13.6 10...... 16.8 15.4 11...... 15.2^ 17.2 17.2 13.95 15.3 17.0 16.5 15.3 13.6 12...... 15.3 14.0 17.45 13...... 17.35 16.6 1ft Q 15.1 13.6 14...... 17.0 ii"75 17.45 16.3 15...... 15.4 17.4 16.5 15.2 16.1 14.9 16...... 17.5 15.15 16.3 17.5 17.1 16.15 13. 7 17..'...... 17.0 ie.4 13.65 13.6 18...... 15.5 14.95 16.7 17.15 16.15 14.8 19...... 13.6 i7.5 13.5 20...... 16.3 17.2 1465 21...... 17.7 16.9 17.1 17.4 16.0 22...... 15.6 16.15 14.8 13.7 14. 5 13.5 23...... 15.65 17.45 16.9 17,35 17.4 17.1 15,9 * ...... 13.4 25...... 15.7 17.5 14,6 18.0 15.7 14.4 26...... 16.95 14.5 14.0 17 4<; 13.4 27...... 17,0 28...... 15.8 17.55 16.9 16.1 14.45 14.05 17.2 17.4 15.9 14.3 29...... 16.05 14.2 13.3 30...... 17.55 16.85 17.3 t T Q 1ft Q 15.9 31...... 16.2 16.0 14. 15. SUEFACE WATER SUPPLY, 1919^-1920, PA$T I. Daily gage height, in feet, of Moosehead Ldk&at east outlet, Maine, for the years ending Sept. 30, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan- Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 13.1 12.9 15.0 tA ±K 12.0 17.3 2...... li.1 17.3 15.7 14. & 3...... 13.1 13.05 16.1 16.8 4...... 13.0 12.95 11.8 17.3 15.65 14.5 5...... 13.2 15.1 14.3 11.2 16.75 6...... 12.95 12.8 11.6 16.4 15.6 14.4 7...... 13.5 14. 2 11. S 16.6 17.25 16.65 8...... 12.9 13.5 15.05 11.4 14. 3 9...... 19 7 11.35 i7.25 16.6 15.45 10...... 12.95 13.7 15.05 14.05 11.5 17.2 14.2" 11...... 17.3 15.45 12...... 13.8 1$ Q 12.65 11.6 17.3 16.5 to ft, 13...... 12.95 15.15 11.5 17.3 * 15.35 14.1 14...... 14.0 1*> Q 12.3 15...... 12.9 15.1 11.4 17.3 16...... 13.65 17.3 15.3 14.0 17...... ]£85 14.25 15.05 11.3 12.7 17.25 14.3 18...... 17.2 15.2 19...... 13.45 12.6 11 9 tO A 17.2 16.25 20...... 12.85 14.4 14.8 12.4 15.1 14.2" 21...... 14.5 10 e .... 13.4 17.25 16.2 22...... 12.85 14.8 17.0 ill 23...... 13.5 12.3 ii.6 13.9 17.0 16.15 15.0 24...... 12.8 14.6 17.25 14.0 25...... 14.9 26...... 14.7 14.7 13. 45 12.2 10.05 14.6 17.25 17.0 27...... 12.8 14.8 13. » 28...... 19 1 17.3 15. 9 29 12.8 Id. Q 14.6 to o 11.0 15.1 1ft Q 15.8 30...... 15.4 16.8 15.75 14.6 13.9- 31...... 12.8 14.6 10 0 11.05 KENNEBEC RIVER AT MOOSEHEAD, MAItfE. LOCATION. At the Canadian Pacific Railway bridge, one-fourth mile below East Out let dam on Moosehead Lake, half a mile northwest of Moosehead railroad station in Big Squaw Mountain Township, Piscataquis County, and 4.4 miles from Somer set Junction. DRAINAGE AREA. 1,240 square miles (measured on map compiled by Maine Water; Power Commission). RECORDS AVAILABLE . October 1, 1919, to September 30, 1920. t GAGE. Chain gage near middle of bridge, downstream side. DISCHARGE MEASUREMENTS. Made from bridge. CHANNEL AND CONTROL. Large boulders and gravel. Control is a series of rapids; practically permanent. EXTREMES OP DISCHARGE. Maximum stage recorded during year, 7.13 feet, May 10 and 13 (discharge, 13,400 second-feet); minimum stage recorded 0.79 foot Novem* ber 8 (discharge, 102 second-feet). ICE. Probably not affected by ice. REGULATION. Operation of the gates at Moosehead Lake causes large diurnal fluctua tion during the log-driving season. ACCURACY. Rating curve fairly well denned below 7,000 second-feet. Gage read to hundredths twice daily. Daily discharge determined by applying rating table to mean daily gage height. Owing to the operation of the gates in the dam just above, some uncertainty exists in regard to accuracy of the mean daily gage height during the log-driving season, usually May, June, and July. Records fair. KENHBBEC HIVES, BASIN". 45 Discharge measurements of Kennebec Rwer at Moosehead, Maine, dwing the year endin Sept. 80, 1920. ' ' [Made by J. W. Monlton.] Dis- , Dis Di»- Date. Gage Date. Date. Gage height. C08cr^6* height. charge. height. charge. Feet. Sec.-ft. Feet. Sec.-ft. Feet. Sec.-ft. Nov. 6...... 0.95 145 3.09 1,990 May 20...... 5.26 6,710 6...... 95 145 Feb. 12...... 3.13 2,080 Sept. 20...... 2.88 1,770 Dec. 10...... 2.55 1,230 Daily discharge, in second-feet, of Kennebec River at Moosehead, Maine, for the year endmg Sept. 30, Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 1,370 ' 140 610 2,480 2,160 2,160 1,650 262 2,480 2,650 2,830 2,160 2...... 1,370 140 505 2,160 2,010 2,160 1,650 258 6,020 3,020 2,830 2,160 3...... 1,290 140 470 2,160. 2,010 2,010 1,790 270 2,160 6,290 2,830 2,160 4...... 1,290 140 1,140 2,160 2,010 2,160 1,720 270 2,320 2,160 2,830 2,160 5...... 1,290 140 1,090 2,160 2,160 2,160 1,790 270 6,290 2,160 2,830 2,160 6...... 1,260 136 1,040 2,160 2,160 2,480 1,860 290 3,220 2,650 2,830 2,160 7...... 1,260 133 1,580 2,160 2,320 2,480 1,860 290 3,220 2,160 2,830 2,010 8...... 1,110 102 1,260 2,160 2,320 2,480 2,010 310 2,830 2,160 2,830 2,160 9...... 1,110 118 1,320 2,160 .2,010 2,480 2,160 1,090 2,160 2,160 2,650 2,160 10...... 1,140 133 1,320 2,160 2,160 2,320 2,160 6,850 2,160 6,020 2,650 2,160 11...... 1,140 151 1,320 2,010 2,010 2,lfiO 2,160 7,440 2,830 2,160 2,650 2,010 12...... 1,140 184 1,320 2,010 2,160 2,160 192 12,900 6,570 2,160 2,650 2,010 13...... 1,260 220 1,260 2,010 2,010 2,160 136 13,300 2,160 2,160 2,650 2,010 14...... 1,260 246 1,260 2,160 2,010 2,160 148 12,900 2,160 4,070 2,650 980 15...... 1,220 164 1,200 2,160 2,010 2,160 136 6,850 6,570 2,480 2,650 980 16...... 1,220 170 1,200 2,320 2,010 2,010 151 2,830 3,850 2,480 2,650 1,380 17...... 1.080 184 1,200 2,320 2,010 2,010 184 6,020 3,020 2,480 2,650 1,720 18..:...... 1,080 270 1,200 2,160 2,010 2,010 178 5,760 2,160 2,480 2,6EO 1,720 19...... 1 080 230 1,650 2,160 2,160 1,860 157 6,570 6,020 2,480 2,480 1,720 20...... 1^110 212 2,480 2,160 2,160 1,790 181 7,440 2,010 2,650 2,650 1,650 21...... 1,110 174 2,650 2,160 2,160 1,790 181 5.510 2,010 2,650 2,650 1,790 22...... 1,110 880 2,480 2,160 2,320 1,790 188 6J290 2,160 2,480 2,480 1,790 23...... 1.110 1,260 2,480 2,160 2,160 1 720 195 4,070 6,290 2,830 2,320 1,790 24...... i 080 610 2,480 2,160 2.160 1,650 195 4,070 2,160 2,480 2,320 2,010 25...... l'080 540 2,480 2,160 2,160 l'650 226 6,290 2,320 2,830 2,320 2,010 26...... 1.080 540 2,320 2,010 2,160 1,580 223 5,76G 6,290 2,480 1,860 2,010 27...... '(Vrn 540 2,320 2,160 2,160 1 580 23D 6,290 6,020 2,830 1,860 2,010 28...... 970 505 2,320 1,860 2,160 1 580 234 3,850 6,020 3,020 1,860 2,010 29...... 970 505 2,320 1,860 2,160 1 580 262 6,290 2,320 2,830 1,860 2,010 30...... O7O non 2,320 2,010 1,580 206 6,290 2,320 3,020 2,010 2,010 31...... 140 2,320 2 010 1,580 2,160 2,830 2,160 NOTE. Gage heights from Oct. 9 to Nov. 5 unreliable and records from Oct. 1 to Nov. 5 based on study of discharge through the gates of the East Outlet dam. Monthly discharge of Kennebec River at Moosehead, Maine, for the year ending Sept. 30, [Drainage area, 1,240 square miles.] Discharge in second-feet. Month. Per Run-off Maximum. Minimum. Mean. square in inches. mile. 1,370 140 1,120 0.903 1.04 1,260 102 328 .265 .30 December...... 3,650 470 1,640 1.32 1.52 2,480 1,860 2,130 1.72 1.98 February...... 2,320 2,010 2,120 1.71 1.84 2,480 1,580 1,980 1.60 1.84 April...... 2,160 136 816 .658 .73 May...... 13,800 258 4,810 3.88 447 6,570 2,010 3,600 2.90 3.24 July...... 6,290 2,160 2,820 2.27 2.62 August...... 2,830 1,880 2,520 2.03 2.34 2,160 980 1,900 1.53 1.71 13,300 102 2,150 1.73 23.63 46 STTBFACE WATER SUPPLY, 1919-J920, PAET I. KENNEBEC RIVER AT THE FORES, MAINE. LOCATION. Half a mile above highway bridge and 1 mile above mouth of Dead River at The Forks, Somerset County. DRAINAGE AREA. 1,570 square miles. RECORDS AVAILABLE. September 28, 1901, to September 30, 1920. GAGES, Gurley 7-day recorder on right bank half a mile above highway bridge; chain on bridge and water-stage recorder on left abutment used prior to October 18,1919. Recorder inspected by S. C. Durgin. DISCHARGE MEASUREMENTS. Made from the bridge. CHANNEL AND CONTROL. Channel at bridge is subject to slight changes; control for new location is well denned by riffles a short distance below the gage. At old location, stage-discharge relation occasionally affected by backwater from Dead River. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 8.0 feet at 10 a. m. November 22 and at 8.15 a. m. May 19 (discharge, 15,400 second-feet); minimum stage recorded, 1.0 foot at 8 a. m. September 7 (discharge, 510 second-feet). Maximum stage from water-stage recorder, for the year ending September 30, 1920, 8.50 feet at 10 p. m. May 12 (discharge, 16,000 second-feet); minimum stage from water-stage recorder, 2.05 feet at noon November 12 (discharge, 615 second-feet). 1901-1920: Maximum stage recorded, 10.1 feet by water-stage recorder from 4 to 12 p. m. June 18,1917 (discharge, by extension of rating curve, 23,700 second- feet); minimum stage 0.3 foot at 7 a. m. Oqtqb.er 27,1911 (discharge, 215 second- feet). ICE. Stage-discharge relation seriously affected by ice for several months. REGULATION. Flow regulated by storage in Moosehead Lake. During May, June, July, and August, the operation of Indian Pond for log driving causes a large diur nal fluctuation. Records of monthly discharge have been corrected for storage by adding or Wbtracting the amount of water stored in or released from Moose- head Lake. ACCURACY. Prior to October 18, 1919, stage-discharge relation was occasionally affected for short periods by backwater from Dead River. Rating curve well defined between 500 and 12,500 second-feet. Water-stage recorder in operation October 18 to November 30, 1918, and April 28, 1919, to September 30, 1920. Chain gage read to tenths once daily December 1, 1918, to April 27, 1919. Daily discharge ascertained by discharge integrator or by application of rating table to gage height, with corrections for effect of ice during the winter. Records Discharge measurements of Kennebec River at The Forks, Maine, during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Jan. 14 A. F. McAlary...... «4.18 i 3on <* 4.42 1,980 Mar. 11 .....do...... 2.81 2.120 Feb. 11 .....do...... o 7.69 2,090 Sept. 26 J. W. Moulton...... 2.42 1,700 Mar. 26 .....do...... o3.23 1.780 Oct. 12 .....do...... 2.68 1,840 Apr. 17 .. ...do...... b 4.36 3,740 Nov. 7 .....do...... 2.23 770 May 19 .... .do.'...... 6.14 8,140 Dec. 9 .....do...... 03.32 1,610 June 29 .....do...... 2.37 907 « Stage-discharge relation affected by ice. 6 Stage-discharge relation affected by logs. . KENNEBEG EIVEE BASIS'. 47 Daily discharge, in second-feet, of Kennebee River at The Forks, Maine, for the years ending Sept. SO, 1919 and 1921 Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Au! Sept. 1918-19. 1...... 1,380 3,150 5,300 2,800 3,500 s,m 1.850 7,200 4,200 3,150 3,6CO 2,;800 2...... 1,240 2,450 4,700 2,800 3,500 3,100 1,750 7,000 3,950 3,050 3,5CO 3,000 3...... 1,200 2,100 5,500 2,500 3,400 3,600 1,550 9,600 3,900 2,950 3,550 2,750> 4...... 1,300 1,600 4,700 2,500 3,100 3,300 1,450 11,500 3,750 3,300 3,400 2,550 5...... 1,640 1,540 4,000 2,400 3,400 3,400 1,450 11,500 3,200 2,750 3,550 2,80ft 6...... 2,100 1,260 2,800 2,500 4,000 2,800 1,350 10,300 3,250 2,800 3,55b 2,600 7...... 2,160 1,180 2,400 2,800 4,000 2,700 1,250 8,000 3,450 3,000 3,400 2,500 8...... 2,000 1,080 4,100 3,300 2,800 2,500 1,450 8,600 3,450 2,900 3,45P 2,450 9...... 1,660 1,000 4,000 3,300 3,100 2,700 1,550 9,300 3,400 2,900 3,400 2,400 10...... 1,360 1,000 4,000 3,300 3,300 2,700 1,750 8,100 3,500 2,950 3,35p 2,300 11...... 1,200 1,000 4,000 3,400 3,600 2,100 2,100 6,600 3,550 2,900 3,300 4,000 12...... 1,880 960 2,800 3,400 2,800 2,400 3,450 7,500 3,100 2,800 2,900 13...... 1,640 900 2,800 3,400 2,800 2,400 4,500 6,900 3,200 2,700 3,350 2,350 14...... 1,820 880 3,000 3,500 2,800 2,500 4,500 6,200 2,900 3,200 3'4i$ 2,200 15...... 1,620 860 3,400 3,500 3,000 2,400 4,500 5,100 3,450 2,800 2,100 16...... 1,580 820 3,400 3,600 3,000 2,200 4,300 4,500 3,250 2,900 3, 50^ 1,860 17...... 1,600 800 3,600 4,000 3,000 2,100 3,300 4,200 3,050 2,850 3,350 1,820 18...... 1,960 1,800 3,600 4,000 2,800 2,000 2,850 9,000 3,100 2,900 3,400 2,000 19...... 1,920 6,000 3,600 3,900 2,800 1,980 3,150 11,400 2,950 3,000 3,300 1,920 20...... 1,800 11,000 3,800 3,900 3,000 1,860 2,700 7,800 3,000 2,600 3,400 1,840 21...... 1,860 15,000 3,600 3,800 3,000 1,740 2,750 8,200 2,850 3,000 3,34 1,800 22...... 1,880 14,800 3,000 3,800 2,800 1,340 2,700 8,000 3,050 3,400 2,950 1,760 23...... 1,600 9,000 3,600 3,800 3,000 1,100 4,150 8,000 3,000 3,600 3,200 1,76ft 24...... 1,400 4,600 3,400 3,700 3,400 1,100 6,900 7,900 2,950 3,550 3,000 1,600- 25...... 1,240 2,900 3,400 3,700 3,400 1,100 10,900 8,100 3,000 3,750 2,900 1,54ft 26...... 1,320 2,500 2,500 3,600 3,300 1,100 14,600 8,500 2,950 3,400 2,80(1 1,70ft 27...... 1,460 2,400 3,000 3,600 3,600 1,100 13,900 8,600 3,600 3,450 2,70(1 1,66ft 28...... 1,540 3,600 2,800 2,800 3,600 1,560 11,600 7,900 3,200 4,800 2,65( ly.720 29...... 1,460 4,600 2,800 3,600 2,100 9,700 7,600 3j 000 4,400 2,75C 1,84ft 30...... 1,800- 5,200 2,800 3,600 2,400 7,400 6,500 2,850 4,000 2,85C 1,880- 31...... 3,000 2,800 3,600 2,100 5,300 3,700 3,000 1919-20. 1...... 2,020 1,350 1,290 2,700 2,200 2,200 2,400 3,130 3,680 3,580 3,250 2,46ft 2...... 1,960 1,290 1,350 2,600 2,100 2,100 2,400 2,550 4,070 3,780 2,550 3...... 1,960 1,120 1,290 2,400 2,100 1,900 2,500 2,280 3,840 3,650 2,550 4...... 1,900 990 1,290 2,100 2,100 1,900 2,500 1,950 3,700 3,'500 3! 600 2,550 5...... 1,900 920 1,650 2,200 2,200 2,000 2,600 .1,950 3,940 3,690 3,600 2,55ft 6...... 2,020 920 1,700 2,200 2,400 2,300 2,800 3,130 4,030 3,600 3,500 2,460 7...... 2,140 775 1,850 2,200 2,300 2,600 2,900 3,970 5,540 3,770 3,500 2,46ft 8...... 2,140 714 1,800 2,200 2,200 2,700 3,000 3,860 4,810 3,800 3,510 2*550 9...... 1,840 6S2 1,600 2,200 2,100 2,600 3,100 5,940 5,730 3,700 3,040 2,550 10...... 1,900 650 1,450 2,100 2,100 2,400 3,100 9,560 3,830 3,710 3,240 2,460 11...... 2,020 622 1,500 2,100 2,000 2,400 3,100 12,000 3,110 3,640 2,930 2,37ft 12...... 1,980 615 1,650 2,100 1,850 2,100 1,650 14,500 3,450 3,800 3,210 2,370 13...... 1,860 900 1,550 2,000 1,800 2,100 1,350 15,800 3,800 3,620 2,940 2,300 14...... 1,980 1,600 1,250 2,100 1,700 2,200 2,500 15,500 3,710 3,460 3,760 2,300 15...... 2,110 1,540 1,200 2,200 l;550 2,300 3,300 11,600 3,780 3,470 3,660 2,100 16...... 1,980 1,290 1,300 2,300 1,900 2,200 3,700 5,940 3,510 3,240 3,870 1,850 17...... 1,750 1,120 1,750 2,300 1,900 2,200 3,800 6,200 3,400 3,340 3,720 1,750 18...... 1,660 1,000 2,400 2,300 1,900 2,100 3,800 7,560 3,420 3,760 1,800 19...... 1,660 940 2,800 2,300 1,900 2,000 3,700 8,400 3,380 3,510 2,030 20...... 1,660 890 2,900 2,300 1,950 1,750 4,200 8,980 3,660 3^370 3,080 2,030 21...... 1,660 900 2,900 2,200 1,950 1,750 4,680 7,560 3,500 3,330 3,610 2,030 22...... 1,660 1,350 2,900 2,100 2,000 1,750 4,680 7,840 3,600 3,030 2,510 1,950 23...... 1,730 1,470 3,000 1,900 2,300 1,600 4,680 6,960 3,520 3,450 2,710 1,950 24...... 1,660 1,290 3,000 1,850 2,300 1,600 4,320 4,970 3,470 3,670 2,700 1,950 25...... 1,660 1,230 2,900 1,900 2,300 1,700 3,750 5,220 3,400 3,400 4,470 2,190 26...... 1,660 1,180 2,800 2,100 2,300 1,850 3,130 4,980 3,530 3,230 3,130 2,190 27...... 1,660 1,120 2,800 2,100 2,200 1,900 2,740 4,870 3,690 3,500 3,130 2,190 28.'...... 1,470 1,070 2,700 2,000 2,200 2,100 2,740 4,830 3,530 3,610 2,370 2,190 29...... 1,470 1,070 2,600 1,950 2,200 2,200 2,930 4,090 3,550 3,280 2,190 2,190 30...... 1,470 1,230 2,600 2.000 2,400 3,230 4,400 3,440 3,780 2,110 2,280 31...... 1,540 2,700 2,100 2,400 3,490 3,510 2,370 NOTE. Stage-discharge relation during year ending Sept. 30,1919, affected by ice Jan. 4-16, m9; dis charge for this period,' and for Jan. 17 to Feb. 25, 1919, when gage heights were apparently unreliable, estimated from one discharge measurement and records of discharge from Moosehead Lake. Discharge for year ending Sept. 30, 1920, based on records as follows: Oct. 1-11, 1919, from water- stase recorder at highway bridge; Oct. 12-17,1919, from readings of chain gage; Oct. 18, 1919, to Sppt. 30, 1920, from water-stage recorder at new location half a mile above highway bridge. Stage-discharge relation affected by ice Dec. 5, 1919, to Apr. 19, 1920. Discharge estimated from gage heights corrected for effect of ice by five discharge measurements, observer's notes, and climatic records. Discharge estimated Aug. 3-7 and Sept. 13-18, 1920, by hydrographic comparison with records at Moosehepd and Sbawmut. SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Kennebec River at The Forks, Maine, for the years ending Sept. 30, 1919 and 1920. [Drainage area, 1,570 square miles.] Discharge in second-feet. Observed. Corrected for storage. Corrected Month. run-off in inches. Per Maximum. Minimum. Mean. Mean. square mile. 1918-19. 3,000 1,200 1,670 3,580 2.28 2.63 15,000 800 3,530 5,210 3.32 3.70 5,500 2,400 3,520 2,680 1.71 1.97 4,000 2,400 3,370 2,350 1.50 1.73 4,000 2,800 3,210 1,160 .739 .77 3,600 1,100 2,230 1,880 1.20 1.38 April...... 14,600 1,250 4,510 8400 5.35 5.97 11,500 4,200 7,900 7,900 5.03 5.80 4,200 2,850 3,270 2,770 1.76 1.96 July...... 4,800 2,600 3,210 1,950 1.24 1.43 3,600 2,650 3,250 1,170 .745 .86 4,000 1,540 2,210 1,230 .783 .87 The year...... 15,000 800 3,490 3,350 2.14 29.07 1919-20. '2,140 1,470 1,810 1,460 .930 1.07 1,600 615 1,060 3,630 2.31 2.58 3,000 1,200 2,080 1,720 1.09 1.26 2,700 1,850 2,160 500 .318 .37 2,400 1,550 2,070 690 . .439 .47 2,700 1,600 2,110 880 .561 .65 April...... 4,680 1,350 3,180 8,470 5.39 6.01 May...... 15,800 1,950 6,580 8,860 5.64 6.50 5,730 3,110 3,790 3,170 2.02 2.25 July...... 3,800 2,930 3,500 2,240 1.43 1.65 3,920 2,110 3,240 1,870 1.19 1.37 2,550 1,750 2,240 1,380 .879 ,98 15,800 615 2,820 2,900 1.85 25.16 KENNEBEC RIVER AT WATERVILLE, MAINE. LOCATION. At dam and mill of Hollingsworth & Whitney Co. at Waterville, Ken- nebec County, 2 miles above Sebasticook River and 3J miles above Messalonskee Stream. DRAINAGE AREA. 4,270 square miles. RECORDS AVAILABLE. March 22, 1892, to September 30, 1920. GAGES . Rod gages in pond above dam and in tailrace of mill. A water-stage recorder is used to obtain a record of height of water in tailrace and head on the wheels. DETERMINATION OF DISCHARGE. Daily discharge determinations are the sums of the discharge through several wheels, through the logway, and over the spillway, as computed from one set of observations a day on several gages. When flow is less than about 3,500 second-feet all the water is used through the wheels. ICE. Stage-discharge relation not usually affected by ice; in most years winter flow passes through wheels of mill. REGULATION. -Numerous power plants and much storage above station; records not corrected for storage. COOPERATION. Records furnished by Hollingsworth A Whitney Co. XENNEBEC SIVEB BASIN. 49 Daily discharge, in second-feet, of Kennebec River at Waterville, Maine, far the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 23,100 13,000 4,730 5,200 4,000 16,800 18, 900 14,900 4,460 4,470 4,120 2...... 5* WO 18,400 4150 4*» 2,360 3,440 15,700 20, 300 11,700 4,320 4,440 4,460 3...... 4.740 14,000 10,700 4,750 5,280 4,380 13,600 30, 800 9,860 4,280 5,030 5,050 4...... 4,490 12,000 11,600 4,740 4,960 4,400 5,560 26 100 8,400 3,020 4,620 3,550 5...... 3,830 9,430 12,100 3,040 5,030 4,620 8,660 27, 700 8,960 5,020 4,440 4,010 6...... 4,440 7,710 10,000 4,690 5,030 5,080 7,200 21, 100 5,780 3,090 4,310 3,840 7...... 21,200 6,900 5,000 3,880 4,070 4,360 8,770 23, 500 8,670 4,560 4,400 2,950 8...... 16,200 6,160 3,940 4,040 4,660 4,200 10,400 20 300 9,520 4,220 4420 4,130 9...... 12,700 5,820 5,610 4,060 3,120 4,050 12,100 20, 200 11,700 4,570 4,360 3,830 10...... 10,700 2,950 5,240 4,640 4,620 4,850 12,700 !7, 000 10,600 4,360 3,310 4,510 11...... 8,810 4,110 5,910 4,400 4,400 5,700 12,200 19, 300 10,300 4,200 4,510 4,490 12...... 7,180 6,530 5,730 3 630 4,240 6,090 13,200 19 000 8,760 4,260 4,340 5,570 13...... 5,370 5,500 5,340 4 390 3,980 9,420 22,000 13 800 8,550 3,310 4,350 7,140 14...... 6,810 4,720 5,610 4,170 4,080 9,690 31,000 14, 400 7,180 4 720 4,460 7,350 15...... 6,150 5,000 5,390 4,610 4,070 4,290 23,600 12; 200 6,290 4,470 4,490 5,840 16...... 5,520 4,760 7,000 4,620 4,050 3,390 20,800 200 8,580 4,440 4,490 4,970 17...... 5,020 4,700 6,580 4,610 4,400 4,400 20,800 11; 700 7,580 4,420 3,970 4,490 18...... 5,550 5 210 6,230 4,400 4,070 4,070 18,800 21, 200 6,140 4,490 4,530 4,600 19...... 9,290 11,200 5,610 4,760 3,930 5,080 15,900 28, 700 6,520 4,440 4,320 4,370 20...... 8,340 15,700 4,000 4,610 3,910 8,640 18,200 24, 400 6,610 3,240 4,130 4; 440 21...... 9,290 36,400 5,160 4,610 5,250 18,300 13,200 18, 900 6,470 4,470 4,160 3,740 22...... 9,780 39,800 4,770 4,400 3,830 28,500 13,900 18, 900 4,890 4,380 4,170 4.510 23...... 9,280 33,900 5,100 4,400 2,950 22,400 13,900 18, 800 4,480 4,400 4,390 4,560 24...... 10,900 21,800 9,380 5,390 4,200 39,800 17,700 30, 700 4,560 4,530 2,910 4.400 25...... 6,790 17,200 9,290 9,420 4,060 24,300 20,800 24, 500 4,400 4,530 4,190 4,480 26...... 6,080 14,200 9,400 0,530 4,380 19,100 27,300 24, 800 4,140 4,290 3,750 2,420 27...... 5,140 9,850 8,410 9,430 4,150 18,000 26,500 2£ 800 4,300 4,160 4,050 4.320 28...... 7,250 9,340 6,100 8,070 3,890 16,300 25,600 16, 000 4,440 4,620 3,740 1,940 29...... 6,820 12,100 5,670 7,200 36,000 20,100 18, 200 4,220 4,560 4,490 4,086 30...... 6,830 9,080 5,510 3,960 ...... 26,500 24,300 15, 500 4,980 5,840 4,250 3,770 31...... 14,300 4,740 5,780 20,900 IS) 600 4,650 3,550 1919-20. 1...... 4,470 3,890 10,400 3,860 1,590 3,980 20,800 25j 100 5,990 4,380 4,820 3,780 2...... 3,390 9,690 7,300 3,880 3,320 3,280 15,900 20, 000 5,980 4,700 5,380 3,450 3...... 3,280 10,300 6,980 3,900 2,390 3,400 16,100 21. 500 6,320 5,690 5,420 3,970 4...... 3,530 8,580 4,490 1,960 2,600 3,290 16,500 xn, 000 6,660 5,040 4,700 3,730 5...... 1,480 6,990 3,900 3,900 3,790 3,020 18,300 18, 700 6,340 5,210 4,450 3,310 6...... 3,210 6,280 4,220 3,930 3,050 2,670 21,400 10. 600 6,110 5,980 4,400 2,980 7...... 4,560 8,120 2,780 3,900 2,630 1,460 27,500 16 200 8,680 5,690 4,370 4,330 8...... 4,550 4,120 4,510 3,930 1,350 3,780 22,300 18 000 10,600 5,420 3,330 4,360 9...... 4,550 3,460 3,920 3,930 3,330 3,830 17,900 17 900 9,050 5,060 4,440 4,440 10...... 4,530 5,260 3,920 3,900 3,330 3,800 15,600 3^ 100 8,250 4,830 4,270 4,380 11...... 4,510 3,870 5,030 1,650 3,330 3,810 12,000 32, 500 6,690 5,480 4,300 4,310 12...... 3,170 4,510 3,920 4,110 3,100 3,830 26,000 30, 900 8,350 5,980 4,400 1 170 13...... 5,600 3,900 3,920 3,930 3,410 3,830 24,400 30, 200 6,130 5,010 4,390 5,620 14...... 4,580 13,200 4,150 3,930 3,410 2,710 52,100 28, 600 7,390 4,660 5,010 4,690 15...... 4,540 9,260 5,010 3,960 915 4,820 54,300 27, 600 5,110 4,450 4,800 5,350 16...... 4,440 9,570 3,900 3,820 3,880 4,940 37,800 21, 000 4,420 4,480 5,370 4,670 17...... 4,440 10,500 3,880 3,780 2,730 5,210 37,000 18^ 500 7,660 4,310 6,250 4,490 18...... 4,460 6,240 3,830 836 3,420 5440 34,000 15, 200 5,080 4,200 6,580 4,370 19...... 3,130 5,640 3,970 4,080 3,170 5,140 29,800 16, 400 4,330 5,370 5,640 2 360 20...... 4,490 5,370 3,880 3,730 2,680 5,140 26,700 20, 400 4,630 4,380 4,800 4,620 21...... 4,510 3,900 2,190 3,070 2,630 3,620 27,500 600 5,770 4,390 4,420 4,280 22...... 4,120 3,910 4,730 2,500 1,490 5,350 28,200 If; 900 4,570 4,370 3,280 4,290 23...... 4,030, 2,110 3,900 3,230 3,680 5,080 31,400 921 4,570 4,440 4,970 4,060 24...... 4,570 6,970 3,920 2,810 3.550 5,080 36,800 16, 400 4,530 4,420 4,180 3,720 25...... 4,500 6,990 3,120 1,270 3,080 5,610 34,000 15, 700 4,620 1,500 4,220 4,130 26...... 2,490 5,590 4,490 3,550 2,500 8,190 28,200 10, 300 4,700 5,420 4,260 1,180 27...... 4,630 4,760 3,880 3,480 3,050 10,600 22,900 410 4,850 4,700 4,800 4,520 28...... 3,920 5,290 2,510 3,380 3,020 17,800 20,000 5,040 4,490 4,450 4,680 29...... 3,920 3,900 4,110 2,520 1,110 17,000 36,800 i?; 4,370 4,450 3,130 3,530 30...... 3,880 2,370 3,920 3,750 17,000 26,600 "; 100 4,290 4,590 3,430 3 740 31...... 3,920 3,900 2,500 ...... 22,100 9, 190 4,700 3,420 102721 23 WSP 501- 50 SURFACE WATER SUPPLY, 191&-1920, PART I. Monthly discharge of Kennebec Riyer at Waterville, Maine, for the years ending Sept. 30, 1919 and 1920. [Drainage area, 4,270 square miles.] Discharge in second-feet. Run-tiff Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 21,200 3,830 8,080 1.89 2.18 November...... 39,800 2.950 12,600 2.95 3.29 December ...... 13,000 3,940 6,850 1.60 1.84 9,530 3,040 5,150 1.21 1.40 5,280 2,360 4,220 .988 1.03 March...... 39,800 3,390 12,100 2.83 3.26 31,000 ,.V»o 17,000 3.98 4.44 May...... 30,800 11,200 20,100 4.71 5.43 June ...... 14,900 4,140 : 7,'450 1.74 1.94 July...... 5,840 3,020 4,330 1.01 1.16 August ...... 5,030 2,910 4,230 .991 1.14 7,350 1,940 4,400 1.03 1.15 The year ...... 39,800 1,940 8,900 2.08 28.26 1919-20. October ...... 5,600 1,480 4,050 .948 1.09 13,200 2,110 6,150 1.44 1.61 December...... 10,400 2,190 4,340 1.02 1.18 4,110 836 3,320 .778 .90 February...... 3,880 915 2,810 .658 .71 March ...... 22,100 1,460 6,280 1.47 1.70 April...... 54,300 12,000 27,300 6.39 7.13 May...... 37,100 921 18,500 4.33 4.99 June...... 10,600 4,290 6,040 1.41 1.57 July...... 5,980 1,500 4.770 1.12 1.29 August...... 6,580 3,139 4,570 1.07 1.23 September...... 5,620 1,170 3,950 .925 1.03 The year ...... 54,300 836 7,660 1.79 24.43 NOTE. The monthly discharge in second-feet per square mile and the run-off in inches do not represent the natural flow from the basin because of artificial storage. The yearly discharge and run-off doubtless represent more nearly the natural flow, for comparatively little stored water is held over from year to year. DEAD RIVER AT THE FORKS, MAIJTE. LOCATION. One-eighth mile above farmhouse of Jeremiah Durgin, 1J miles west of The Forks, Somerset County. DEAINAGE AREA. 878 square miles. RECORDS AVAILABLE. September 29, 1901, to August 15, 1907; and March 16, 1910, to September 30, 1920. GAGE. Staff bolted to large boulder on left bank; read by H. J. Farley. DISCHARGE MEASUREMENTS. Made from cable 700 feet above gage. CHANNEL AND CONTROL. Stream bed rough; control practically permanent. EXTREMES OP DISCHARGE. Maximum stage recorded for year ending September 30, 1919, 5.0 feet on May 7 and 30 (discharge, 9,700 second-feet); minimum stage recorded, 0.4 foot on July 18 and August 5 and 6 (discharge about 20 second-feet). Maximum stage recorded for year ending September 30, 1920, 4.9 feet at 5 p. m. April 24 (discharge, 9,320 second-feet); minimum discharge estimated 60 second-feet February 4-6 (stage-discharge relation affected by ice). 1901-1907 and 1910-1920: Maximum stage recorded, 8.0 feet May 5, 1904, and May 14, 1912 (discharge, by extension of rating curve, 23,100 second-feet); mini mum stage recorded, 0.2 foot September 12-13, 17, 1918 (water held back by logging dams, discharge not determined). ICE. Stage-discharge relation seriously affected by ice. KENNEBEC KIVER. BASIN. REGULATION. A number of dams on lakes above; used for log driving during May and June. ACCURACY. Stage-discharge relation practically permanent except when affected by ice. Rating curve well defined between 300 and 16,000 second-feet, but roughly approximate below 300 second-feet. Gage read to half-tenths twice daily except during the winter, when it was read three times a week during winter of 1918-19 and once a day during winter of 1919-20. Daily discharge ascertained by applying rating table to mean daily gage height, with corrections for effect of ice during the winter. Records fair above 300 second-feet and poor below 300 second-feet. Discharge measurements of Dead River at The Forks, Maine, during the years ending Sept. SO, 1919 and 1920. Gage Dis Dis- . Date. Made by height. charge. Date. Made by height. charge 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Jan. 14 ol.90 630 Jan. 12 J.W.Moulton...... ol.70 254 Mar. 11 o2.60 Feb. 10 .....do...... ol.28 209 Sept. 26 J.W.Moulton...... QQ qqo Mar. 25 .....do...... 03.38 1,020 Dec. 8 J.W.Moulton...... 1.40 780 Apr. 16 .....do...... 4.08 6,450 .....do...... 1.14 485 a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Dead River at The Forks, Maine, for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1.,...... 1,620 6,140 1,390 450 500 200 3,140 7 480 2,750 240 on 325 2...... 1,320 5,530 1,240 500 450 240 2,750 6,790 2,470 176 50 325 3...... 965 4,970 1,100 550 420 280 2,380 5,830 1,860 148 35 325 4...... 780 3,990 965 600 370 7,480 1,390 100 35 325 5...... 720 3,140 940 600 320 370 1,780 5,530 1,390 100 26 325 6...... 2,200 2,380 840 600 420 420 1,320 4,970 1,'780 130 20 325 7...... 3,990 1,700 720 600 450 500 1,100 6,140 i 7sn 224 100 370 8...... 4,220 1,700 720 600 420 560 1,320 5,830 2,030 160 160 397 9...... 3,340 2,200 720 600 420 560 3,140 4,970 2,120 112 160 560 10...... 2,560 2,560 720 650 420 2,940 5,530 1,940 100 160 780 11...... 1,540 2,380 720 600 420 570 2,750 1,700 1,620 100 160 865 12...... 1,240 2,120 720 630 420 580 2,940 1,700 1,390 90 160 940 13...... 1,240 1,780 720 420 600 6,790 3,770 1,170 75 160 1,100 14...... 1,100 1,700 840 630 420 600 4,970 4,460 965 50 176 1,100 15...... 940 1,540 965 630 370 600 7,480 2,750 940 50 308 965 16...... 840 1,390 965 600 370 600 7,480 2,750 840 50 308 940 17...... 744 1,240 965 550 320 600 2,750 816 50 240 840 18...... 816 1,460 965 500 280 720 4,460 4,300 720 26 240 720 19...... 965 940 550 fJAf) 960 6,790 720 50 240 610 20...... 1,170 3,340 780 600 200 1,400 3,990 7,480 632 35 240 510 21...... 1,780 4,460 560 500 200 1,900 4,220 3,140 4O1 35 200 434 22...... 2,030 4,460 510 420 200 2,400 3,990 3,550 415 60 200 415 23...... 1,860 3,550 700 320 200 3,450 4,460 3,550 415 50 200 370 24...... 1,700 3,140 865 950 4,000 3,770 415 35 224 325 25...... 1,540 2,940 816 1,100 200 4,350 4,460 3,990 343 35 240 325 26...... 1,460 2,750 720 950 200 4,700 4,220 3,550 325 35 282 343 27...... 1,860 2,560 610 850 5,240 3,550 370 35 282 325 28...... 1 860 2 OQfl 720 200 5,240 6 460 343 60 282 325 29...... ;.... 1,860 1,940 460 650 6,140 5,830 3,550 325 112 282 325 30...... 2,940 1,620 415 600 5,240 6,140 8,200 282 148 282 325 31...... 4.710 415 550 3.990 4.970 100 282 SUKFACE WATER SUPPLY, 191&-1920, PART I. Daily discharge, in second-feet, of Dead River at The Forks, Maine, for the years ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 282 1,780 1,240 420 an 76 4,900 6,140 3,480 709 804 570 2...... 282 2,380 430 on 4 400 6,140 3,550 852 768 780 3...... 240 2,750 1,100 320 76 68 4J200 4.970 3,990 952 768 632 4...... 240 2,120 965 320 60 88 3,500 5,530 3,770 965 744 665 5...... 308 1,780 280 60 125 2,500 4,970 3,990 928 687 665 6...... 530 1,700 800 340 60 160 3,200 5,830 4,460 890 632 1,032 7...... 780 1,540 680 280 100 240 2,750 5,530 2,120 852 530 1,700 8...... 744 600 370 160 280 5,830 7,840 804 462 1,100 9...... 590 1,240 580 340 270 2,380 6,790 2,940 792 434 590 10...... 665 1,100 960 340 200 240 2,200 3,140 756 434 610 11...... ;.... 816 965 1,000 340 200 94ft 2,200 6,790 2,560 720 415 665 12...... 720 965 780 210 240 2,030 7,480 2,120 665 415 560 13...... 720 1,620 720 340 175 oin 3,140 6,790 1,700 610 491 610 14...... 665 2,750 660 175 370 4,970 1,390 610 ' 590 698 15...... 610 2,940 260 600 5,830 4,970 1,100 610 665 720 16...... 510 2,200 520 240 140 ftftO 6 460 5,830 1,030 610 698 665 17...... 462 1,620 240 140 QAfi 4,460 902 610 676 676 18...... 415 1,390 430 220 135 1,000 6,460 4,970 780 510 676 816 19...... 415 1,240 400 9flfi ion 4,970 4,220 780 560 654 890 20...... 415 1,100 440 200 120 1,100 3,550 4,460 780 665 632 865 21...... 1,030 420 200 110 1,100 4,970 780 780 610 828 22...... 510 965 200 100 7,840 4,460 780 816 560 780 23...... 462 1,240 370 100 1,050 8,200 5,530 928 792 540 732 24...... 415 1,320 175 100 1,050 8,940 4,460 804 804 610 687 25...... 415 1,240 460 160 100 1,000 8,940 3,990 780 816 590 621 26...... 1,240 CAA 160 92 1,050 7,130 3,930 665 840 570 570 27...... 610 1.100 420 1 "iA 00 5,530 3,850 610 828 600 520 28...... 610 965 O7f» 1Ofi »1 4,970 4,970 3,800 560 720 560 510 29...... 610 QfiK QOft 100 80 5,530 3,700 560 698 570 530 30...... 665 1 * 240 370 110 5,550 5,530 3,630 590 816 510 540 31...... 400 92 <\ im 3,570 828 560 NOTE. Stage-discharge relation affected by ice from Dec. 27,1918, to Mar. 27,1919; discharge estimated on basis of gage heights corrected for effect of ice by means of two discharge measurements, observer's reports, and weather records. Discharge May 18 and 19,1919, estimated. Stage-discharge relation affected by ice Dec. 5,1919, to Mar. 27, 1920; discharge estimated from, gage heights corrected for eflect of ice, by four discharge measurements, observer's notes, and climatic records Discharge Mar. 29,1920, to Apr. 6, and May 26-31, 1920, estimated by hydrographic comparison with records for Ossipee River. Monthly discharge of Dead River at The Forks, Maine, for the years ending Sept. SO, 1919 and 1920. [Drainage area, 878 square miles.] Discharge in second-feet. Month. Per Run-off Maximum. Minimum . Mean. square in inches. mile. 1918-19. 4,710 720 1,800 2.05 2.36 6,140 1,240 2,780 3.17 3.54 1,390 415 791 .901 1.04 1,100 320 622 .708 .82 February...... 500 200 330 .376 .39 March...... 6,140 200 1,860 2.12 2.44 April...... 7,480 1,100 4,170 4.75 5.30 May...... 8,200 1,700 4,630 5.27 6.08 2,750 282 1,100 1.25 1.40 July...... 240 26 89.4 .102 .12 308 20 188 .214 .25 September...... 1,100 325 538 .613 .68 The year...... 8,200 20 1,580 1.80 24.42 1919-20. 1,240 240 546 .622 .72 2,940 965 1,530 1.74 1.94 1,390 320 632 .720 .83 430 92 249 .284 .33 210 60 121 .133 .15 5,550 60 1,190 1.38 1.57 8,940 2,030 4,860 5.54 6.18 May...... 6,790 3,570 5,100 5.81 6.70. 4,460 560 1,980 2.26 2.52 July...... 965 510 755 .860 .99 804 415 595 .678 .78 September...... 1,700 510 728 .829 .92 8,940 60 1,520 | 1.73 23.63 STJEFACE WATEE SUPPLY, 1919-1920, PABT I. ANDBOSCOGGIN RIVER BASIN. ANDROSCOGGIN RIVER AT ERROL DAM, N. H. LOCATION. At Errol dam, 1 mile above Errol, Coos County. DRAINAGE AREA. 1,095 square miles. RECORDS AVAILABLE. January 1, 1905,.to September 30, 1920. GAGE. Movable rod gage; readings taken daily from sill of deep gate No. 6; elevation of zero of gage or sill of gate, 1,231.3 feet above mean sea level. DISCHARGE. Computed from discharge through 14 gates in the dam by means of coefficients determined from a few discharge measurements.4 ICE. Stage-discharge -relation little affected by ice. REGULATION. Errol dam regulates the storage of Umbagog Lake, the lower of the Rangeley series of lakes, comprising the principal storage of Androscoggin River and amounting to nearly 20 billion cubic feet, and also a recently developed stoarge site on Magalloway River created by the Aziscohos dam, which amounts to about 9.6 billion cubic feet, thus making the total stoarge about 29.6 billion cubic feet. Errol dam is about 5 miles below outlet of Umbagog Lake and about 3.5 miles below mouth of Magalloway River, thus making this stream one of the feeders of Umbagog Lake. Records not corrected for storage. COOPERATION. Records obtained and computations of daily discharge made under direction of Walter H. Sawyer, agent for Union Water Power Co., Lewiston, Maine. r: Daily discharge, in second-feet, of Androscoggin River at Errol dam, N. H.,for the year* ending Sept. 80. 1919 and 1980. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1,210 2,310 1,950 2,650 1,900 1,880 1,170 2,070 3,470 1,980 2,020 1,650 2...... 1,210 2,750 1,960 2,740 1,950 1,860 1,180 2,100 2,960 2,110 2,000 1,600 3...... 1,160 2,730 1,930 2,690 1 QOft 1,850 1,310 2,180 2,960 2,120 i oon i Ksn 4...... 1,300 2,650 1,750 2,690 1,880 1,850 1,440 2,450 2,930 2,080 1,860 1 71ft 5...... 1,100 2,610 1,890 1,830 1,850 1,470 2,600 2,930 2,020 1,830 1 7O1 6...... 613 2,530 2,260 2,630 1,800 1,880 1,360 2,610 2,910 1,680 1,960 1,720 7...... i ftin 2,480 2,200 2,620 1,800 1 Qd/l 1,160 2,660 2,530 1,7*0 2,010 1,750 8...... 2,100 2,110 2,100 2,410 1,800 1,960 1,120 2,680 2,430 1,880 1,970 1 7K/1 9...... 1,860 1,540 2,050 2,310 1,800 1,980 1,140 2,610 2,420 1,.870 1,820 1,760 10...... 1,630 1,540 1,940 2,340 1,780 1,830 1,360 2,570 2,380 1,930 1,810 1,670 11...... 1,510 1,540 1,860 2,360 1,760 1,840 1,520 2,560 2,320 2,050 1,810 1 640 12...... 1,490 1,540 1,860 2,470 1,730 1,840 1,690 2,540 2,280 2,060 1,820 1,640 13...... 1,450 1,710 1,860 2,500 1,730 1,850 2,410 2,540 2,260 2,060 1,840 1 fiSfl 14...... 1,430 1,860 1,890 2,400 1,800 1,850 2,940 2,360 2,140 2,070 1,600 i &tn 15...... 1,390 1,830 1,900 2,310 i ftifl 1,860 2,960 2,280 2,080 1,860 1,850 1,560 16...... 1,350 1,820 1,920 2,310 1,820 1,870 3,000 2,360 2,000 1,870 1.820 1,500 17...... 1,340 1,800 i tun 1 840 i onn 2,960 3,040 2,000 2,000 i 7on 1 ifiO 18...... 1,320 1,780 2,000 2,250 ilseo 1,840 2,660 4,450 2,120 2,080 i 7on i inn 19 1,320 1,880 2,100 2,200 1,860 1,810 2,470 4,970 2,180 2,250 1,780 1 sin 20...... 1,320 i tun 2,140 2,180 1,870 1,650 2,460 5,210 1 Q5U1 2,180 1,780 1,720 21...... 1,320 1,990 2,140 2,190 1,910 1,720 2,440 5,210 1,830 2,050 1,790 1,720 22...... 1,340 2,030 2,140 2,170 1,910 1,570 2,440 6,600 1,860 1,840 1,820 1,680 23...... 1,340 2,040 2,050 2,080 1,890 1,400 2,420 6,970 1,950 1 930 1,850 1,660 24...... 1,340 2,040 2,010 2,050 1,830 1,380 2,440 7,070 2,000 2,' 020 1,850 1 fiQO 25...... 1,320 2,010 2 Daily discharge, in second-feet, of Androscoggin River at Errol dam, N. H.,for the years ending Sept. 30, 1919 and 1920 -Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 1,890 668 1,220 1,820 2,030 2,000 1,480 2,390 3,340 1,590 1,270 1,760 1,570 876 1 OCA 1,840 2,030 1,960 1,470 2,390 3,340 1,620 1,540 1,760 1,060 939 1,280 1,870 2,040 1,960 1,430 2,390 3,140 1,620 1,700 i 7*m 4...... - 1,040 982 1,280 1,920 2,040 1,980 1,470 2,390 2,700 1,-620 1,710 1,960 5...... -:...-.- 964 1,040 1,590 1,920 2,020 1 940 1,420 2 3sn 2 4.00 1,590 1,750 2,010 6...... 818 1,130 1,760 1 880 2,010 2,010 1,310 2,360 2,410 1,570 1,780 i ofin 7...... 1,180 1,270 1,670 1,740 2,010 2 nftn 1,290 2,360 2,410 1,620 1,840 1,590 1,390 1,480 1 ftAA 1,690 2,010 2 ft3A 1,410 2 0QA 2,240 1,690 i swift 1,460 9 1,320 1,510 1,500 1,850 2 040 1,580 3,180 1,730 1,800 1,630 10...... 1,060 1,350 1,950 2,020 2 AAA 1 400 3,870 2,180 1,730 1,820 1,690 11...... 996 1,650 1 730 1,960 2,010 2 ftftfl 1,160 2,170 1,730 1,820 l,74t) 12...... 1,180 1,540 1,790 1,960 2,000 1,920 1,100 3,780 2,130 1,690 1,580 1,800 13...... 1,340 1,430 1,660 1 950 2,020 1,860 554 3,040 2,110 1,760 1,400 1,870 14...... 1,510 960 1,730 l'950 2,000 1,950 370 2,480 2,080 1,560 1,250 1,810 15...... 1,450 4S9 1 QPLft 1,980 1 960 1,910 ft fin 2,380 2 1918-19. 2,100 613 1,370 1.25 1.44 2,750 1,540 2,020 1.84 2.05 2,380 1,750 2,010 1.84 2.12 2,740 2,000 2,330 2.13 2.46 1,950 1,730 1,840 1.68 1.75 1,980 1,010 1,650 1.51 1.74 3,000 1,120 2,050 1.87 2.09 May...... 7,150 2,070 4,020 3.67 4.23 3,470 1,450 2,240 2.05 2.29 July...... 2,250 1,680 1,990 1.82 2.10 2,160 1,600 1,870 1.71 1.97 September...... 1,950 1,450 1,690 1.54 1.72 The year...... 7,150 613 2,090 1.91 25.96 1919-20. 1,890 764 1,340 1.22 1.41 1,650 482 1,180 1.08 1.20 1,980 1,220 1,740 1.59 1.83 2,010 1,690 1,910 1.74 2.01 2,040 1,900 1,990 1.82 1.96 2,060 500 1,670 1.53 1.76 3,640 370 1,560 1.42 1.58 May...... 5,120 2,100 3,000 2.74 3.16 3,340 1,560 2,110 1.93 2.15 July...... 1,760 1,340 1,580 1.44 1.66 1,920 1,200 1,690 1.54 1.78 2,010 1,340 - 1,700 1.55 1.73 5,120 370 1,790 1.63 22.23 NOTB. The monthly discharge in second-feet per square mile and the run-off in inches do not represent the natural flow from the basin because of artificial storage. (See "Regulation.") ANDROSCOGGIN RIVER BASIN. 55 AWDROSOOGGHSr RIVER AT BERLIN, N. H. LOCATION. At upper or sawmill dam of Berlin Mills Co., at Berlin, Coos County. DRAINAGE AREA. 1,380 square miles (revised from map compiled by Maine Water Power Commission). RECORDS AVAILABLE. October 1, 1913, to September 30, 1920. GAGES. rFixed games' are maintained in the river above the forebay racks and in the tailrace immediately below the outlet of the wheels; these gages are referred to the same datum, and the differences in the readings give the head on the wheels; a gage is also attached to each wheel gate, from which the wheel-gate opening can be ascertained. DETERMINATION OF DISCHARGE. Discharge computed from curves prepared from Holyoke tests of the wheel runners, using the head and gate openings as ascer tained from the gages. Quantity of water wasted over the dam is computed by the Francis formula for discharge over weirs. ICE. Stage-discharge relation not affected by ice. REGULATION. Under an agreement between the power users on Androscoggin River the flow at Berlin, N. H., is maintained at a minimum of 1,550 second-feet and at such a point above 1,550 second-feet as is consistent with the constant main tenance of that quantity. Final regulation of the river is made at Pontocook dani^*H., above which is a pond containing about a day's supply; the primary regulation is"1 made at Errol, N. H., about 30 miles above Berlin. Records not corrected for storage. COOPERATION. Gages are under the direction of George P. Abbott, of the Berlin Mills .Co., and discharge record is furnished by Walter H. Sawyer, agent for Union Water Power Co., Lewiston, Maine. J)aily discharge, in second-feet, of Androscoggin River at Berlin, N. H., for ike years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. i 1...... 1,500 5,500 2,100 2,600 1,900 1,840 1,900 2,600 3,500 2,000 1,950 1,750 2...... 1,520 5,500 2,000 2,400 1,900 1,850 1,820 2,500 3,300 2,000 1,900 1,770 3...... 1,550 5,500 2,20tt 2,400 1.900 1,850 1,820 3,600 2,300 2,000 1,900 1,750 4...... 1,550 3,800 2ltiO 2,300 1,990 1,850 1,850 3,700 2,400 2,150 1,850 1,740 5...... 1,550 3,000 1,950 2,200 1,950 1,880 1,900 3,800 2,400 2,150 1,760 1,750 6...... 3,000 2,600 2,000 2,150 1,900 1,850 1,950 3,750 2,400 2,200 1,750 1,730 7...... 7,000 2,600 2,100 2,050 1,880 1,820 1,950 3,500 2,300 2,150 1,720 1,740 8...... 5,000 2, (500 2 108 3,200 1,880 1,850 2,400 3.500 2,300 2,000 1,790 1,840 9...... 3,200 2,400 2,050 2,200 1,890 1,850 2,600 3,300 2,550 1,950 1,750 1,800 10...... 2,500 2,300 2,100 2,100 1,880 1,900 2,600 3,400 2,400 1,800 1,750 1,800 11...... 2,100 2,200 2,100 2,200 1,890 1,880 2,300 3,200 2,150 1,880 1,740 1,820 12...... 2,000 1,950 2,050 2,250 1,900 1,840 3,900 3,150 2,250 1,900 1,720 2,400 13...... 1,950 1,950 2,050 2,250 1,900 1,820 4,000 2,900 2,200 2,000 1,720 2,200 14...... 1,900 1,950 2,050 2,300 1,880 1,850 4,900 2,700 2,150 2,000 1 780 2,000 15...... 1,600 1,950 2,300 2,250 1,900 1,820 4,400 2,550 2,150 1,950 1,780 - 1,800 16...... 1,600 1,950 2,300 2,100 1,900 1,800 4,000 2,450 2,200 1,950 1,780 1,800 17...... 1,650 1,950 2200 2,000 1,850 1,850 3,800 3,000 2,150 1,950 1,760 1,700 18...... 1,900 2,000 2,200 2,000 1,850 1,850 3,700 4,500 2,100 1,920 1,750 1,720 19...... 1,950 2,400 2,180 2,000 1,800 1,900 3,700 7,000 2,100 1,900 1,750 1,750 20...... 1,950 2,700 2,200 2,000 1,820 1,820 3,700 6,500 2,050 1,900 1,730 1,770 21...... *%ooo. 2.600 2,200 2,960 1,820 2,200 3,600 6,500 2,000 1,900 1,750 1,800 22...... :...... 2,300 ?500 2,450 2,050 1,850 2,020 3,500 10,000 2,050 1,920 1,760 1,740 23...... ?,m |200 2,800 2,050 1,850 2,000 3,400 10/000 2,020 1,920 1,750 1,750 24...... 2,000 5' 200 2,700 2,000 1,880 2,000 3,600 9,800 1,990 1,900 1,770 1,750 25...... 1,850 2,200 2,600 2,000 1,820 1,850 3,400 9,600 2,000 1,900 1^750 1,760 26...... 1,800 2.200 2,700 2,000 1,840 1,850 3,700 9,400 2,000 1,920 1,750 1.750 27...... 1,650 2,050 2,400 2,000 1,850 1,900 3,700 9,000 2,100 1,920 1,750 1,780 28...... 1,800 2,000 2,400 2,100 1,820 3,200 3,250 7,500 2,150 1 920 1,790 1,750 29...... 1,700 2,200 2,150 2,050 2,800 3,450 7,000 2,100 1,920 1,750 1,730 30...... 2,200 2,200 2.200 2,000 ...... 2,200 2,850 4,500 2,050 1,920 1,750 1,740 31...... 7.000 2.100 1,950 2.000 4.000 1,900 1,750 56 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Androscoggin River at Berlin, N, E.,for the years end ing Sept. SO, 1919 and 1920 Continued. Day. Opt. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 1,760 2,800 2,100 1,820 1,900 1,880 1,950 3,600 3000 1,900 1,900 1,900 2...... 1,820 2,700 1,800 1,800 1,900 1,800 1,950 3,600 3' 300 1,900 1,880 1,900 3...... 1,850 2,100 1,780 1,800' 1,920 l'800 1,9-50 3,400 3' ooo 1,900 1,900 1,880 4...... 1,780 1,800 1,850 1,800 1,900 1,840 2,000 3,400 2,800 1,900 1,870 1,900 5...... 1,760 1,740 1,900 1,820 1,900 1,850 2,100 3,000 3,400 1,900 1,880 1,900 6...... 1,800 1,730 1,900 1,880 1,900 1,880 2,200 2,800 4,000 1,900 1,880 1,910 7...... 1,820 1.730 1,900 1,800 1,900 1,850 2,000 2,900 3,400 1,900 1,890 1,900 8...... 1,750 1,740 1,900 1,800 1,900 1,800 1,900 3,200 2,800 1,920 1,880 1,900 9...... 1,720 1,740 1.920 1,800 1,900 1,880 1,950 3,700 2,600 1,900 1,900 1,850 10...... 1,740 1,750 1,900 .1,800 1,900 1,860 2,200 5,000 2,400 1,900 1,900 1,880 11...... 1,730 1,750 1,900 1,800 1,900 1,850 2,100 4,900 2,200 1,900 1,950 1,900 12...... 1,750 1,900 1,900 1,800 1,900 1,860 2,200 4,400 2,200 1,950 1,970 1,900 13...... 1,730 2,700 1,950 1,800 1,900 1,920 2,400 3,600 2,200 1,900 1,920 2,050 14...... 1,730 2,400 1,950 1,800 1,900 1,960 2,900 3,000 2,100 1,950 1,900 2,200 15...... 1,700 1,750 1,990 1,800 1,900 1,950 2,700 2,800 2,100 1,950 1,900 1,900 16...... 1,720 1,740 1,900 1,820 1,900 2,000 3,000 2,600 2,100 1,900 1,880 1,900 17...... 1,720 1,720 i oftn 1,800 1,880 1,980 2,800 2,500 2,100 1,900 1,890 1,900 18...... 1,740 1,730 1,900 1,800 1,900 1,600 2,600 2,500 2,100 1,900 1,890 1,900 19...... 1,740 1,740 1,900 1,820 1,880 1,920 2,600 2,500 2,100 1,900 1,890 1,850 20...... 1,730 1,680 1,900 1,840 1,880 1,920 3,000 2,500 2,100 1,900 1,890 1,800 21...... 1,730 1,700 1,900 1,830 1,880 1,900 3,600 2,600 2,050 1,880 1,900 1,850 22...... 1,750 1,720 1 Q9fl 1 840 1,880 1,850 4,300 3,000 2,000 1,880 1,900 1,900 23...... 1,750 1,700 1,900 1*810 1,900 1,850 5,500 3,700 1,950 1,900 1,900 1,980 24...... 1,750 1,690 1,900 1,800 1,900 1,900 5,800 4,000 1,900 1,950 1,900 2,000 25...... 1,750 1,700 1,900 1 800 1,900 1,950 5,000 4,200 1,900 1,900 1,900 2,000 26...... 1,770 1,720 1,910 1,800 1,900 2,200 3,800 4,200 1,900 1,850 1,900 2,000 27...... 1 740 1,720 1,900 1,850 1,850 2,600 3,400 3,800 1,900 1,800 1,1900 2,020 28...... 1,720 1,950 1,900 1,900 1,880 2,503 3,800 3,600 1,900 1,800 1,900 2,000 29...... 1 720 1,800 1,900 1,900 1,900 2,050 3,600 3,400 1,900 1,880 2,050 30...... 1,720 1,800 1,900 1,900 1,900 3,600 k#» 1,890 2,300- 31...... 2,400 1,880 1,900 1,920 ' 1/900 1^900 Monthly discharge of Androscoggin River at Berlin, N. H.,for the years ending Sept. SO, 1919 and 1920. [Drainage area, 1,380 square miles.] Discharge in second-feet. Run-off Month. Per in Inches. Maximum. Minimum. Mean. square mile. ~ t-Sti'. -M.S.- 1918-19. October...... 7,000 1,500 2,360 1.71 1.97 5,500 1,950 2,640 1.91 2.13 2,800 1,950 2,230 1.62 1.87 2,600 1,889: 2,130 1.54 1.78 1,990 - i,m 1,876 1.36 1.42 3 200 1,800 1,970 1.43 1.65 April...... 4,900 1,820 3,120 2.26 2.52 10,000 2,450 5,130 3.72 4.2& June...... 3,500 1,990 2,260 1.64 1.83 July...... 2,200 1,800 1,960 1.42 1.64 August...... 1,950 1,720 1,770 1.28 1.48 2,400 1,700 1,810 1.30 1.45 10,000 1,500 2,440 1.77 24.03 1919-20. 2,400 1,700 1,770 1.28 1.48 2,800 1,680 1,880 1.36 1.52 2,100 1,800 1,900 1.38 1-59 1,900 1,806 1,820 1.32 1.52- 1,920 1,850 1,890 - ftfafr" 1.48 2,600 1,600 1.4l! > 1.6g April...... 5,800 , 1,900 2.14 2.39 May...... 5,000 2,500 2.44 2.81 June...... 4,000 1,900 2^380 1.72 r>92 July...... 1,950 1,800 1,900 1.38 1.5& 1,970 1,870 1,900 1.38 1.59- 2,300 1,800 : 1,940 ..... 1-41 1.57 The year...... 5,800 .1,600 : 2U40 1.55 21. <# NOTE. 'the monthly discharge in second-feet per square mile and the run-off in inches do not represent the natural flow from the basin because of artificial storage. (See "Regulation.") ASTDBOSCOGGISr RIVER BASIN. 5T ANDROSCOGGIN RIVER AT RUMFORD, MAINE. LOCATION. At two dams of Rumford Falls Power Co. at Rumford, Oxford County. DRAINAGE AREA. 2,090 square miles. RECORDS AVAILABLE. May 18, 1892, to September 30, 1920. GAGES. One in pond above each dam and in tailraceg of power station and mills. DISCHARGE. Computed from discharge over the dam by use of the Francis weir formula with modified coefficient, and the quantities passing through the various- wheels of the power station and mills, which have been carefully rated. ICE. Stage-discharge relation little affected by ice. REGULATION. Storage in Rangeley system of lakes at headwaters of Androscoggitt River, aggregates about 29.6 billion cubic feet. The stored water is regulated in the interests of the water-power users above and below this station. Re cords not corrected for storage. COOPERATION. Records obtained and computations made by Mr. Charles A. Mixer,, engineer, Rumford Falls Power Co. Daily discharge, in second-feet, of Androscoggin River at Rumford, Maine, for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 2,620 7,010 2,480 2,910 2,700 2,600 4,190 4,070 4,630 2,600 2,630 1,810. 2...... 2,750 5,650 2,290 3,360 2,240 2,150 3,680 4,780 4,700 2,530 2,230 2,210- 3...... 2,580 4,900 2,940 3,470 2,670 2,590 3,440 5,400 3,980 2,200 1,590 2 nnA 4...... 2,690 4,650 3,200 3,350 2,710 2,640 3,270 4,860 3420 1,640 2,230 2,190 5...... 2,760 4,340 3,080 2,650 2,700 2,660 3,180 5,870 3,230 1,610 2,290 2,170 6...... 6,270 4,090 2,730 3,120 2,700 3,060 2,880 6,460 3,250 2,230 2,150 2,160 7...... 8,600 3,900 2,540 2,740 2,640 3,140 4,450 5,450 3,130 2,590 2,180 1,690 8...... 6,250 3,840 2,360 2,890 2,630 2,950 6,480 5,150 2,630 2,520 2,010 2 240 9...... 5,040 3,610 3,000 3,060 1,940 2,140 5,650 4,990 3,140 2,520 2,270 2,620 10...... 4,540 2,750 2,780 2,350 2,550 2,960 5,800 4,420 3,420 2,340 1,900 2,950 11...... 3,520 2,740 2,790 2,770 2,440 3,010 4,810 4,150 3,260 2,440 2,130 2,530 12...... 3,110 3,150 2,800 2,340 2,520 2,890 10,200 3,690 2,990 2,300 2,120 3,880> 13...... 2,360 2,780 2,840 2,620 2,550 2,810 11,200 3,630 2,900 1,820 2,070 4,970 14...... 2,800 2,870 2,880 2,970 2,610 2,660 9,030 3,580 2,720 2,340 1,970 2,450 15...... 2,810 2,910 2,750 3,090 2,550 2,730 8,090 3,370 2,380 2,500 2,200 2 720 16...... ;...... 2,710 3,030 3,390 2,970 1,850 2,100 6,090 3,070 2,670 2,430 2,870 2,470 17...... 2,590 2,340 3,280 3,040 2,510 2,470 6,420 2,980 2,940 2,460 1,550 2,350- 18...... 3,290 4,040 3,100 3,020 2,580 2,740 6,300 7,550 2,940 2,460 2,190 2,330. 19...... 4,110 5,890 2,950 2,610 2,490 3,160 6,360 7,920 2,820 2,,280 2,220 2,180 20...... 2,700 5,680 2,930 2,880 2 440 3,590 5,440 6,680 2,870 1,530 2,260 2,240 21...... 4,010 5,380 3,100 2,990 2,550 4,690 6,000 5,750 2,750 2,300 2,230 1,610 22...... 3,880 4,850 2,540 2,880 2,500 6,780 5,720 7,070 1,990 2,580 2,190 2,170 23...... 3,580 4.190 3,830 2,970 1,800 6,140 5,590 14,600 2,580 2,580 2,200 2,250 24...... 3,260 3,440 4,580 3,420 2,570 6,040 5,730 10,700 2,640 2,390 2,150 2,250 25...... 2,860 3,330 4,150 3,370 2,490 5,080 5,310 8,630 2,640. 2,330 2,250 2,280- 26...... 2,690 3,340 4,050 2,810 2,590 4,870 4,730 8,650 2,620 2,260 2,200 2,290 27...... 2,690 2,890 3,520 3,220 2,530 4,870 4,080 8,240 2,710 1,600 2,210 2,290* 28...... 3,200 2,490 3,580 3,060 2,570 9,060 4,630 7,610 3,060 2,250 2,180 1,930 29...... 2,980 3,330 2,730 3,050 12,800 4,670 6,990 2,440 2,270 2,260 2,200 30...... 3,930 3,580 2,940 2,890 7,720 4,980 5,750 2,600 2,520 2,240 2,230« 31...... 8,300 2,590 2,790 ...... 5,120 5,440 2,640 1,400 58 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Androscoggin River at Rumford, Maine, for the years ^ ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 2,140 7,300 4,020 9 inn 2 37ft 2,280 4,770 8,700 4,230 2,550 2,160 2,270 2...... 2,330 6,140 3,540 2,460 2,330 2,260 4,680 7,440 4,310 2,390 2,240 2,310 3...... 2,490 4,980 2,580 2,410 2,400 2,230 4,720 7,530 4,210 2,290 2,440 2,300 4...... 2,800 3,430 2,300 1,860 2,310 2,230 5,140 7,380 4,030 1,960 2,320 2,310 5...... 1,960 3,450 2,590 2,280 2,380 2,320 5,060 7,130 3,950 1,640 2,240 2,090 6...... 2,420 3,520 2,640 2,280 2,340 2,420 8,120 6,720 5,370 2,120 2,230 2,030 7...... 2,630 3,130 1,930 2,750 2,400 2,100 6,570 7,250 6,250 2,320 2,140 2,500 8...... 2,500 2,980 2,SOO 2,740 2,420 2,030 5,160 7,800 5,090 2,250 1,910 2,710 9...... 2,300 2,210 2,700 2,470 2,360 1,950 4/220 8,4*0 4,050 2,360 2,330 2,500 10...... 2,350 3,040 2,830 2,530 2,460 2,120 3,870 10,600 3,800 2,380 2,230 2,330 11...... 2,580 2,820 2,680 1,930 2,450 2,710 4,090 9,110 3,320 1,910 2,420 2,390 12...... 2,170 2,930 2,750 2,600 2,460 2,470 5,010 7,800 3,230 2,300 2,970 2,420 13...... 2,390 6,600 3,020 2,580 2,350 2,840 10,700 6,970 2,750 2,400 2,710 2,570 14...... 2,320 6,640 2,560 2,550 2,460 3,210 18,600 6,250 2,690 2,300 2,450 3,150 15...... 2,290 3,990 3,230 2,520 2,430 3,560 9,380 5,650 2,870 2,430 2,420 2,960 16...... 2,310 2,420 2,740 2,340 2,300 3,390 8,190 4,870 2,800 2,390 2,820 2,550 17...... 2,400 3,120 2,66,0 2,550 2,260 3,270 8,630 5,380 2,720 2,200 2,570 2,400 18...... 2,460 3,030 2,600 2,130 2,310 3,250 8,130 5,800 2,680 1,950 2,379 2,350 19...... 2,070 4,000 2,440 2,180 2,280 3,030 7,750 6,040 2,520 2,380 2,500 2,750 20...... 2,320 2,830 2,810 2,290 2,220 2,850 8,650 5,830 2,470 2,900 2,340 2,470 21...... 2,320 2,440 2,150 2,260 2,260 2,780 10.200 5,740 2,530 2,550 2,310 2,420 22...... 2,420 2,900 2,560 2,430 2,030 2,680 13,200 8,130 2,680 2,350 1,980 2,370 23...... 2,630 2,210 2,630 2,430 2,370 2,820 13,000 7,540 2,840 2,290 2,530 2,380 24...... 2,560 2,890 2,250 2,340 2,310 3,410 13,600 6,760 2,680 2,460 2,590 2,120 25...... 2,340 2,680 1,950 2,300 2,360 4,880 11,200 6,520 2,550 2,190 2,370 2,390 26...... 1,710 2,710 2,490 2,320 2,380 6,610 8,560 6,670 2,390 2,120 2,200 2,100 27...... 2,290 2,660 2,870 2,360 2,250 8,670 7,940 6,740 1,880 2,220 2,270 2,220 28...... 2,450 2,640 2,050 2,370 2,030 10,400 9,060 6,350 2,220 2,040 2,340 2,470 29...... 2,580 2,600 2,480 2,340 1,810 8,490 9,770 5,680 2,390 2,190 1,940 2,420 30...... ;.. 2,420 3,120 3,050 2,400 6,300 9,030 4,120 2,390 2,200 2,410 3,580 31...... 5,170 2,470 2,300 5,600 4,240 2,250 2,290 Monthly discharge of Androscoggin River at Rumford, Maine, for the years ending Sept. SO, 1919 and 1920. [Drainage area, 2,090 square miles.] Discharge in second-feet. Month. Per Run-off Maximum. Minimum . Mean. square in Inches. mile. 1918-19. 8,600 2,360 3,730 1.78 2.05 7,010 2,340 3,900 1.87 2.09 4,580 2,290 3,050 1.46 1.68 3,470 2,340 2,970 1.42 1.64 2,710 1,800 2,490 1.19 1.24 12,800 2,100 4,140 1.98 2.28 April...... 11,200 2,880 5,610 2.68 2.99 May...... 14,600 2,980 6,050 2.89 3.33 4,700 1,990 3,000 1.44. 1.61 July...... 2,640 1,530 2,290 1.10 1.27 2,870 1,400 2,150 1.03 1.19 September...... 4,970 1,610 2,400 1.15 1.28 The year...... 14,600 1,400 3,490 1.67 22.65 1919-20. 5,170 1,710 2,460 1.18 1.36 November ...... 7,300 2,210 3,510 1.68 1.87 4,020 1,930 2,660 1.27 1.46 January.. 2,750 1,860 2,380 1.14 1.31 2,460 1,810 2,310 1.11 1.20 Murch,...... 10,400 3'STO'1,950 3,710 1.78 2.05 April...... 18,600 8,230 3.94 4.40 May...... 10,600 4,120 6,810 3.26 3.76 5,370 1,880 3,260 1.56 1.74 July...... 2,550 1,640 2,270 1.09 1.26 2,970 1,910 2,360 1.13 1.30 3,580 2,030 2,460 1.18 1.32 18,600 1,710 3,530 1.69 23.03 NOTE. The monthly discharge in second-feet per square mile and the run-off in inches do not represent the naturalflowfrom the basin because of artificialstorage. (See "Regulation.") The indicated minimum discharge usually occurs on Sunday, when water is held back by dams. RIVER BASIN. MA0ALLOWAY RIVEB. AT AZISCOHOS DAM, MAINE. LOCATION. At Aziscohos dam, Oxford County, 15 miles above the mouth. DRAINAGE AREA. 233 square miles (revised from map compiled by Maine Water Power Commission). RECORDS AVAILABLE. January 1, 1912, to September 30, 1920. GAGE. Vertical staff in two sections, the lower attached to one of the concrete but tresses of the dam and the upper on the concrete gate tower. DETERMINATION OF DISCHARGE. Discharge determined from readings of gate open ings. Gates have been rated by current-meter measurements at a station about a mile below the dam. REGULATION. The storage of about 9,593 million cubic feet is completely regulated, and the discharge corresponds to requirements of water users below. The opera tion of the gates is planned to maintain as nearly as possible a constant flow at Berlin, N. H. Records not corrected for storage. COOPERATION. Discharge records furnished by Walter H. Sawyer, agent Union Water Power Co., Lewiston, Maine. Monthly discharge of Magalloway River at Aziscohos dam, Maine, for the 'years ending Sept. SO, 1919 and 1920. [Drainage area, 233 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 403 205 290 > 1.24 1.43 412 162 204 .876 .98 1,480 163 796 3.42 3.94 616 590 604 2.59 2.99 669 179 264 1.13 1.18 534 141 341 L46 1.68 April...... 504 144 226 .970 1.08 Mav 1,720 159 817 3.51 4.05 1,670 88 456 1.96 2.19 July...... 1,590 96 375 1.61 1.86 1,860 936 1,290 5.54 6.39 ,1,660 136 577 2.48 2.77 1,860 88 523 2.24 30.54 1919-20. 141 15 82.8 .355 .41 15 15 15 .064 .07 1,710 15 1,030 4.42 5.10 1,640 1,260 1,460 6.27 7.23 1,680 894 1,150 4.94 5.33 1,410 50 509 2.18 2.51 April...... 81 65 72.7 .312 .35 May...... 1,100 81 293 1.26 1.45 1,160 34 596 2.56 2.86 July...... 950 34 264 1.13 1.30 35 35 35 .150 .17 1,580 35 574 2.46 2.74 1,710 15 505 2.17 29.52 NOTE. All gates in the dam were closed Oct. 18 to Dec. 4,1919: discharge during this period estimated as 15 second-feet by observation. The monthly discharge in second-feet per square mile and the run-off in inches do hot represent the natural run-off from the basin because of storage. 60 SUEFACE WATER SUPPLY, 1919-1920, PART I. LITTLE AKDROSCOaaZXT BIVEB. HEAR SOUTH PARK, HAUTE. LOCATION. At an old dam at Bisco Falls, 200 feet below highway bridge and 5$ miles above South Paris, Oxford County. DRAINAGE AREA. 75 square miles. RECORDS AVAILABLE. September 14, 1913, to September 30, 1920. GAGE. Chain on left bank installed April 16, 1914; original gage, a vertical staff, was destroyed by ice March 2, 1914; from March 18 to April 9, 1914, a chain gage on a footbridge was used; all gages referred to same datum and at nearly the same place. Gage read by G. A. Jackson. DISCHARGE MEASUREMENTS. Made from highway bridge or by wading. CHANNEL ANI> CONTROL. At low and medium stages water flows through opening at left of old stone dam; opening was enlarged by high water of April 9, 1914; water flows over dam at gage height 5.30 feet. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 7.6 feet at 8 a.m. March 29 (discharge, 1,280 second-feet); minimum stage recorded, 1.0 foot on August 3, 5, 8, and 12 (discharge, 4 second-feet). Maximum stage recorded for the year ending September 30, 1920, 9.87 feet at 7 a. m. April 14 (discharge by extension of rating curve, 3,540 second-feet); min imum discharge estimated 1 second-foot several days in February and March. 1914-1920: Maximum stage recorded, 9.87 feet April 14,1920 (discharge, 3,540* second-feet); minimum stage recorded, 0.7 foot at 6 p. m. August 16, 1914 (dis charge, 1 second-foot). ICE. Stage-discharge relation not affected by ice. REGULATION. Storage at Snow's Falls, 1$ miles above the station, and at West Paris, 4 miles above, has some effect on regimen of stream. ACCURACY, Stage-discharge relation changed at the time of high water April 9, 1914; otherwise practically permanent. Rating curve well denned below 700 second- feet and fairly well defined between 700 and 1,800 second-feet. Gage read to tenths, occasionally to half-tenths, once daily. Daily discharge ascertained by applying rating table to daily gage height. Records good except for times of sudden changes in stage, when the number of gage readings is insufficient to determine accurately the mean daily flow. The rating curve was verified by one discharge measurement made in February, 1921. ANDROSCOGGIN RIVER BASIN. 61 t>aity discharge, in second-feet, of Little Androscoggin-River near South Paris, Maine, for the years ending Sept. SO, 1919 and 1920. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 219 325 179 92 124 108 325 239 108 34 9 10 2...... 199 281 149 108 124 179 270 292 92 29 9 10 3...... 179 219 140 124 124 140 270 281 92 24 4 9 4...... 179 199 124 124 108 149 281 270 84 20 6 16 5...... 159 219 124 108 108 159 281 281 76 20 4 18 6...... 397 179 124 108 116 149 259 249 140 24 9 12 7...... 426 159 116 92 76 149 348 249 92 76 9 29 8...... 325 159 108 92 100 132 360 259 92 47 4 3,4 9...... 259 159 108 92 76 179 372 179 84 34 8 37 10...... 219 199 100 94 100 219 372 159 76 29 8 40 11...... 199 159 100 84 92 219 397 140 76 20 6 76 12...... 159 140 92 84 84 229 458 132 68 20 4 124 13...... 140 120 108 84 76 199 512 124 76 16 8 159 14...... 120 120 140 84 76 179 458 124 84 20 34 108 ,,15...... 1 ^ ...... 120 120 149 92 68 124 426 108 92 16 16 76 16...... 104 112 124 84 68 124 397 108 92 34 14 47 17...... 80 104 116 92 84 116 426 179 76 16 9 47 18...... 303 348 124 92 76 159 384 442 68 12 9 34 19...... 219 426 124 84 68 199 372 348 61 12 16 37 ^0...... 179 372 116 92 76 325 325 270 47 9 14 47 21...... 325 314 108 84 84 760 249 219 61 12 9 29 22...... 179 249 124 100 76 900 219 442 47 20 10 34 23...... 120 239 159 108 68 900 169 900 47 16 9 47 24...... 120 189 209 411 76 900 199 458 47 16 8 37 25...... 104 189 239 426 68 535 189 384 29 20 9 34 26...... 120 159 219 325 68 458 179 325 34 12 10 34 27...... 179 124 219 239 61 372 179 219 47 12 8 32 28...... 108 199 219 68 760 179 219 92 12 8 34 29...... 159 219 92 199 1,080 219 199 47 9 6 29 30..,...... 219 199 84 179 512 249 124 47 10 g 32 «!...... 458 68 169 384 132 10 9 1919-20. 3...... 40 458 426 149 3.8 558 458 88 76 34 22 2...... 47 458 325 124 3.8 458 426 72 34 29 20 3...... 47 348 219 124 4.6 442 372 72 34 29 16 4...... 54 325 199 108 2.8 426 325 72 40 24 18 5...... 61 372 140 100 1.8 426 303 64 34 20 26 6...... 76 411 124 92 2.8 43 2,070 259 140 34 24 29 7...... 68 325 108 92 3.8 72 700 219 219 47 20 84 8...... 68 292 124 76 4.6 50 650 239 179 40 20 61 9...... 61 219 108 68 4.6 43 585 700 120 29 16 54 10...... 68 219 108 47 3.8 43 615 458 96 34 24 68 11...... 54 229 100 34 3.8 50 458 426 88 29 29 68 12...... 61 239 100 26 2.8 120 475 325 80 34 116 47 13...... 68 426 124 24 2.8 209 650 303 64 24 108 61 14...... 61 830 140 15 2.7 314 2,900 219 58 16 92 76 15...... 61 458 124 10 3.7 281 760 219 58 40 84 47 16...... 54 458 124 8.4 3.7 249 650 199 50 34 68 58 17...... 68 239 108 5.6 2.7 239 650 199 37 29 47 47 18...... 68 219 108 3.8 2.8 239 535 179 37 29 47 34 19...... 61 249 100 5.6 1.7 239 535 159 43 34 34 32 20...... 68 179 84 3.8 2.7 219 558 159 37 108 34 29 21...... 76 140 140 6.9 1.8 249 535 149 43 61 47 24 22...... 76 149 140 5.6 281 1,470 558 50 47 24 26 W...... 76 239 149 3.8 303 650 458 37 54 29 34 24...... 68 209 140 4.6 325 535 325 26 47 24 32 25...... 76 179 132 3.8 411 650 303 26 24 34 29 26...... 76 140 132 5.6 458 650 281 22 20 29 34 27...... 92 140 124 3.8 1,180 535 219 22 24 24 34 28...... 149 124 140 2.8 1,280 535 219 20 29 26 47 40 149 124 132 4.6 1,080 493 140 16 24 20 32 30...... 140 411 140 3.8 760 458 104 47 34 20 84 31...... 348 124 2.8 558 88 29 20 NOTE. Water below the gage Feb. 22,1920, to Mar. 5,1920; discharge estimated as 1 second-foot. 62 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Little Androscoggin River near South Paris, Maine, for the years end ing Sept. SO, 1919 and 1920, [Drainage area, 75 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 458 80 205 2.73 3.15 426 104 204 2.72 3.04 December...... 239 68 135 1.80 2.08 426 84 140 1.87 2.W February...... 124 61 85.5 1.14 1.1» March...... 1,080 108 355 4.73 5.45 512 169 311 4.15 4.63 May...... 900 108 260 3.47 4.00 June...... 140 29 72.5 .987 1.08 July...... 76 9 21.3 .284 .33 August...... 34 4 9.5 .126 .19 September...... 159 9 43.7 .583 .65 The year...... 1,080 4 154 2.05 27.91 1919-20. October...... 348 40 81.9 1.09 1.26 830 124 294 3.92 4.37 December...... 426 84 145 1.93 2.22 January...... 149 2.8 37.6 .501 .58 4.6 1.0 2.61 .035 .04 March...... 1,280 1.0 300 4.00 4.61 April...... 2,900 426 720 9.60 10.70 May...... 700 88 390 3.87 4.46 Juue...... 219 16 66.1 .881 July...... 108 16 37.8 .504 August...... 116 16 38.6 .515 !59 84 16 42.4 .565 .63 The year...... 2,900 1.0 171 2.28 31.02 PB-ESUMPSCOT RIVER BASIN. PB.ESUMPSCOT RIVER AT OUTLET OF SEBAGO LAKE; MAINE. LOCATION. At outlet dam at Sebago Lake and hydroelectric plant at Eel Weir Falls, Cumberland County, 1 mile below lake outlet. DRAINAGE AREA. 436 square miles. RECORDS AVAILABLE. January 1, 1887, to September 30, 1920. GAGES. On bulkhead of gatehouse at outlet dam, and in forebay and tailrace of power plant. DISCHARGE. Prior to March, 1904, discharge was determined from records of open ing of gates in dam; since March, 1904, flow from lake has been recorded by three Alien meters, one on each of three pairs of 30-inch Hercules wheels; wheels and recording meters checked by current-meter measurements, brake tests of wheels, and electrical readings of the generator output. Water wasted at regulating gates is measured from records of gate openings and coefficients determined from current-meter measurements. REGULATION. Sebago Lake (area, 46 square miles) is under complete regulation Records not corrected for storage. COOPERATION. Record in cubic feet per minute furnished by S. D. Warren Co.; computations on basis of cubic feet per second made by United States Geological Survey. Water taken from Sebago Lake for supply of Portland water district and leakage through the reservoir dam, a total of about 18 second-feet, is not included in the records. PRESUMPSCOT RIVER BASIN. 63 Daily discharge, in second-feet, of Presumpscot River at outlet of Sebago Lake, Maine, for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 590 560 178 508 608 521 682 830 306 801 690 218 2...... 612 534 608 £54 189 184 740 836 771 760 659 739 3...... 554 185 558 549 568 626 750 853 917 786 301 727 4...... 591 655 584 531 614 634 788/ 191 888 159 799 726 5...... 562 611 621 187 589 586 775 844 872 214 758 704 6...... 109 617 636 446 647 611 114 835 906 295 730 710 7...... 540 637 698 555 642 596 775 835 894 723 733 303 8...... 544 652 189 574 609 531 818 851 334 669 731 741 9...... 658 565 550 603 184 12 866 1,120 933 665 682 692 10...... 609 192 699 556 764 551 995 1,550 941 708 333 705 11...... 606 194 718 576 531 562 1.070 730 938 714 763 720 12...... :.... 514 535 649 195 668 592 1,040 1,740 945 679 617 701 13...... 198 553 650 652 696 596 1,070 1,330 919 291 735 540 u...... 617 611 548 696 658 595 1,260 872 902 682 688 339 15...... 5S2 605 146 592 632 592 1,060 873 352 697 718 741 16...... 623 558 499 641 215 185 1,050 865 877 692 717 718 17...... 606 186 514 673 632 656 2,130 837 877 712 342 718 18...... 672 410 569 647 705 536 2,440 113 844 683 678 740 19...... 533 452 639 150 594 446 2,420 728 806 675 739 717 20...... 176 529 597 580 692 485 2,420 782 861 325 731 749 21...... 622 483 558 666 631 467 1.850 677 816 627 726 292 22...... 586 533 179 640 583 458 966 848 272 661 726 698 23...... 574 510 462 554 180 13 819 1,310 828 660 692 732 24...... 590 186 445 595 596 491 828 1,620 797 679 287 749 25...... 712 485 us 393 667 5Q3 794 843 839 664 730 764 26...... 731 575 237 116 642 616 802 1,840 805 670 730 765 27...... 236 628 500 570 583 621 294 1,620 812 308 725 752 28...... 456 479 496 567 696 508 765 983 795 645 722 271 29...... 577 528 . 157 578 476 785 947 272 677 723 781 30...... 618 485 ' ^d.7 607, 88 761 269 711 678 . 681 771 31...... 586 555 RdA 633 215 696 245 1919-20. 1...... 734 665 686 804 379 854 642 2,870 839 748 326 819 2...... 746 175 706 802 803 818 683 2,840 841 743 788 821 8...... 730 726 724 789 804 823 579 2,830 842 806 770 782 4...... 693 725 738 288 804 815 96 2,840 844 66 787 775 5...... 322 647 728 796 803 808 597 2,830 837 114 766 ' 206 6...... 730 648 695 800 805 743 597 2,790 194 642 764 257 7...... 730 685 211 811 783 182 681 2,770 821 752 777 774 8...... 728 644 745 803 237 805 619 2,700 858 775 288 779 9...... 728 212 703 800 . 803 811 674 2,670 855 806 787 806 10...... 727 751 695 791 802 804 635 2,650 834 729 795 769 11...... 739 609 730 364 800 793 107 2,620 847 272 800 780 12...... 211 689 721 801 811 785 632 2,610 834 785 781 195 13...... 728 676 654 802 789 650 606 2,600 316 798 704 805 14...... 728 632 226 802 774 48 532 2,600 834 762 796 761 15...... 729 649 707 807 363 806 571 2,550 843 824 209 795 16...... 728 248 728 795 801 758 633 628 836 787 780 784 17...... 729 764 717 791 802 770 635 1,400 $44 775 783 812 18...... 717 731 755 328 815 630 392 1,460 842 191 775 728 19...... 268 746 709 801 829 584 961 1,450 829 801 769 241 20...... 789 732 712 803 826 584 810 1,460 240 771 777 785 21...... 799 732 oon 803 823 103 821 1,440 836 69S 750 834 22...... 765 687 730 805 389 591 1,140 1,660 840 814 160 790 23...... 764 68 782 803 803 596 1,930 1,470 840 799 830 812 24...... 799 7 -Monthly discharge of Presumpscot River at oMlet of'Sebago Lake, Maine, for the years ending Sept. SO, 1919 and 1920. [Drainage area, 436 square miles.] Discharge in second-feet. Month. Per Maximum. Minimum. Mean. square mile. 1918-19. October...... 731 109 538 1.23 1.42 "November...... 655 185 471 1.08 1.20 December...... 718 113 487 1.12 1.29, -January...... 116 529 1.21 1.39 February...... 764 180 572 1.31 1.36 "March.... 12 483 1.11 1.28 -April...... 2.440 114 1,060 2.43 2.71 Hay...... 1,840 113 929 2.13 2.46 -June...... 945 272 768 1.76 1.96 July...... 801 159 609 1.40 1.61 August...... 799 245 649 1.49 1.72 'September...... 765 218 650 1.49 1.66 The year...... 2,440 12 647 1.48 20.06 1919-20. -October...... 799 211 679 1.56 1.80 November...... 764 68 1.39 1.55 December...... 803 211 1.53 1.76 January...... 811 288 740 1.70 1.96 February...... 829 237 726 1.67 1.80 March...... 854 13 612 1.40 1.61 April...... 2,860 96 1,090 2.50 2.79 May...... 2,870 164 1,890 4.33 4.99 June...... 858 194 752 1.72 1.92 July...... 824 66 674 1.55 1.79 August...... 832 160 1.60 1.84 September...... 834 195 1.57 1.75 The year...... 2,870 13 819 l.i 25.56 NOTE. The monthly discharge in second-feet per square mile and the run-oft in inches do not represent the natural flow from the basin because of artificial storage. The yearly discharge and run-off donbttess represent more nearly the natural flow, for comparatively little stored water is held over from year to year. SACO RIVER BASIN. SAGO RIVER AT CORNISH, MAINE. LOCATION. At highway bridge at Cornish, York County, half a mile below mouth of Ossipee River. DRAINAGE AREA. 1,300 square miles. BECORDS AVAILABLE. June 4, 1916, to September 30, 1920. GAGES. Water-stage recorder on left bank about 300 feet above highway bridge, installed October 30,1919; recorder referenced to gage datum by hook gage inside of well; chain on highway bridge used from June 4, 1916, to October 29,1919. Datum of well gage is at a different elevation than that of chain gage; at low water the well gage reads 1.17 feet higher than chain gage. Gages read and recorder inspected by A. H. Guimont. DISCHARGE MEASUREMENTS. Made from bridge. OHANNEL AND CONTROL. Channel covered with sand and boulders and broken by one pier at bridge. SACO BIVEE BASIN. EXTREMES OF DISCHARGE. Maximum, stage recorded for the year ending September 30, 1919, 7.94 feet at 8.30 a. m. March 31 (discharge, from extension of rating curve, 13,500 second-feet); minimum stage recorded, 0.43 foot at 6.30 a. m. August 24 (discharge, from extension of rating curve, 458 second-feet). Maximum stage from water-stage recorder, for the year ending September 30, 1920, 10.27 feet at noon April 25 (discharge, 14,100 aeeond-feet); minimum stage from water-stage recorder, 1.86 feet at 9. a. m. September 5 (discharge, 442 second-feet). 1916-1920: Maximum stage recorded, 9.4 feet at 6.30 a. m. June 18, 1917 (dis charge, from extension of rating curve, 17,400 second-feet); minimum open-water discharge in 1920. (An estimated discharge of 350 second-feet occurred several times during January and February, 1918, ^when stage-discharge relation was affected by ice.) ICE. Ice forms to considerable thickness; stage-discharge relation seriously affected during most winters. REGULATION. Distribution of flow somewhat affected by power development at Great Falls 3$ miles above the gage. ACCTTRACT. Stage-discharge relation has apparently changed since station was first established; rating curve used since October 30, 1919, fairly well defined be tween 1,000 and 12,000 second-feet. Operation of water-stage recorder satis factory, except for days indicated in footnote to, discharge table. Chain gage was read to hundredth^ twice daily. Daily discharge ascertained by applying' rating table to mean daily gage height. On account of power regulation it is doubtful if two observations a day were sufficient for determining the true; average for the day, and records may be somewhat in error for individual days, before the water-stage recorder was installed. Since October 30, 1919, the records are good. Discharge measurements of Saco River at Cornish, Maine, during the years ending Sept. 30, 1919 and W20. Gage Dis. Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Oct. 24 2.75 2,460 Feb. 4 J. W.Moulten ...... »4.32 1,140 1919. 2,890 Mar. 5 .....do...... «4.94 1,000 Jan. 29 F.A. Dolloff...... «3.69 1 400 30 .....do...... '...... 8.08 9,880 Feb. 21 A. F. McAlary...... «1.96 1,770 .....do...... 9.21 11,900 Sept. 18 J. W. Moulton...... 2.00 6 .....do...... 8.32 10,300 June 23 .....do...... 3.63 2,240 1920, Aug. 19 .....do...... 2,90 1,310 .....do...... fl440 1,320 .....do...... 2.71 1,230 Stage-discharge relation affected by ice. 102721 23 WSP 501 5 66 SURFACE WATEE SUPPLY, 1919-1920, PART I, Daily discharge, in second-feet, ofSaco River at Cornish, Maine, far the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. I...... 5,100 2,910 2,770 3,690 2,800 1,440 13,100 3,860 4,740 1,530 1,020 , 710 2...... 4,920 3,210 2,630 2,910 2,300 1,530 11,600 3,860 4,200 1,530 950 810 3...... 4,560 3,210 2,380 2,770 2,300 1,730 10,300 4,030 3,860 1,440 985 650 4...... 4.030 3,210 2,500 2,500 2,200 1,730 9,050 4,030 3,370 1,100 1,100 740 E 3,690 3,210 2,500 2,500 1,800 1,930 7,800 4,030 3,210 1,180 1,060 710 6...... 3,530 3,060 2,500 2,400 1,500 2,380 7,090 3,860 3,210 1,350 1,060 710 7...... 3,690 2,910 2,150 2,400 1,700 2,380 6,220 4,200 2,150 1,350 1,020 680 3,860 2,770 2 150 2,300 1,600 2,500 5,830 4,380 2,500 1,350 950 775 3,860 2,630 1,630 2,300 1,300 2,770 5,640 4,380 2,500 1,350 880 845 10...... 3,860 2,630 1,730 2,300 1,500 3,370 5,280 4,030 2,770 1,350 915 880 11...... 3,530 2,500 2,380 2,800 1,500 3,370 5,280 3,860 2,770 1,350 985 950 12...... 3,370 2,380 2,630 2,200 1,600 3,060 5,280 3,860 2,260 1,350 950 1,440 to 3,060 2,380 2,040 2 200 1,600 3,060 5,460 3,860 2,150 1,350 880 1,440 14...... 2,770 2,380 2,150 2,200 1,550 2,910 5,460 3,690 2,150 1,350 845 1,630 T? 2,630 2,380 2,260 2,200 1,550 2,500 5,460 3,530 2,040 1,260 845 1,930 16...... 2,500 2,380 2,380 2,200 1,450 2,500 5,460 3,370 2,040 1,060 915 1,830 17...... 2,260 2,040 2,380 2,000 1,800 2,630 6,420 3,370 2,040 915 915 1,730 152 2,260 2,630 2,630 2,100 1,650 2,910 4,740 4,030 2,150 1,100 845 1,630 1Q 2,260 3,370 2,630 2,100 1,650 2,910 4,740 4,380 1,930 950 1,100 1,530 20...... 2,380 3,690 2,380 2,100 1,600 3,690 5,640 4,740 2,040 775 680 1,440 21...... 2,500 3,860 2,150 2,000 1,400 4,380 5,460 5,100 2,040 950 740 1,350 22...... 2,500 3,860 2,150 2,100 1,200 5,460 5,460 5,640 1,830 1,100 710 1,350 23...... 2,500 3,860 2,910 9 nnn 1,200 6,220 5,460 6,640 1,830 1,100 650 1,260 24...... 2,380 3,690 3,210 3,500 1,250 7,090 4,740 7,560 1,630 1,060 560 1,260 25...... 2,380 3,690 3,530 3,900 1,300 7,090 4,740 8,300 1,630 1,060 740 1*,260 26...... 2,260 3,370 4,380 3,700 1,200 6,860 4,560 8,800 1,530 1,100 880 1,260 97 2,150 3,210 4,380 3,600 1,200 6,860 4,380 8,550 1,530 880 845 1,180 28...... 2,260 2,770 4,380 3,400 1,200 8,300 4,380 7,800 1,530 950 740 1,100 OQ 2,150 2,910 4,030 2 ofin 10,600 4,200 7,090 1,350 1,060 950 1,260 30...... 2,380 3,060 4,030 2,800 12,300 3,860 6,420 1,440 1,060 590 1,260 QI 2,630 4,030 2,900 13,300 5,100 1,060 530 1919-20. 1...... 1,260 1,990 3,600 I con 1,000 1.000 12,000 12,000 5,010 1,550 914 842 2...... 1,100 2,470 3,830 1,550 1,100 920 12,000 11,400 4,500 1,440 914 797 3...... 1,100 2,710 3,760 1,400 1,150 960 11,600 10,600 4,160 1,390 896 770 4...... 1,100 2,900 3,240 1,350 1,100 960 10,600 10,000 3,830 1,290 896 674 5...... 1,100 3,170 3,100 1,300 1,100 980 9,800 9,400 3,600 1,290 932 634 6...... 1,180 3,530 2,780 1,200 1,250 1,250 10,200 8,800 3,760 1,240 1,090 815 7...... 1,350 3,460 2,470 1,200 1,250 1,300 9,600 8,000 3,830 1,240 1,090 833. 8...... 1,350 3,310 2,290 1,450 1,200 1,400 9,000 7,600 3,760 1,240 905 923 9...... 1,350 2,970 2,530 i 4/in 1,250 1,400 8,600 7,600 3,760 1,190 995 842 10...... 1,350 3,040 2,900 1,350 1,250 1,400 8,200 7,400 3,600 1,040 950 905 11...... 1,350 3,170 3,460 1,350 1,200 1 V¥1 8,000 7,210 3,460' 1,090 950 1,040 12...... 1,350 3,040 3,760 1,500 1,100 1,550 7,600 7,400 3 94fl 995 833 995 13...... 1,350 3,380 3 9.4/1 1,400 1 1W1 2,100 8,800 7,400 2 ono 995 923 1 lift 14...... 1,350 4,330 9 Qftfl 1,400 1,200 2,600 10,400 7,020 2,710 1,090 1,190 1,190 15...... 1,440 4,670 2,700 1,350 lylOO 2,800 11,200 6,830 2,530 1,040 1,400 1,090 16...... :..... 1,530 4,840 2,500 1,200 1,300 3,000 13,200 6,450 2,410 1,040 1,610 995 17...... 1,630 4,840 2,300 i 3fln 1,300 3,400 13,400 5,890 2,290 950 1,610 QQ*v 18...... 1,630 4,670 2,300 1,250 1,200 4,000 13,000 5,530 2,290 887 1,770 869 19...... 1,630 4,330 2,200 1,250 1,150 4,000 12,400 5,350 2,230 1,040 1,500 842 20...... 1,630 3,910 2 inn i Qfin 1,250 3,900 11^800 5,180 1,770 1,240 -If 190 887 21...... 1,630 3,530 2,600 ' 1,250 1,250 3,800 11 400 5,010 1 OQft 1,240 995 842 22...... 1,630 3,040 2,200 1,250 i nflft 3,700 12*200 6,070 2,050 1,390 995 950 23...... 1,530 3,040 I QCrt 1,200 1 1WI 3,700 12,600 6,830 2,110 1,500 QCA 1 140 24...... 1,630 2,970 1,950 1,200 1,250 4,900 13,800 6,830 1 OQft 1,440 923 l',090 25...... 1,630 2,840 1,850 1,150 1,200 6,200 14,000 7,210 1,880 1,240 Q1A i fun 26...... 2,780 1,800 1,150 1,150 7,600 13,600 7,210 1,770 1,290 o*tn 887 27...... 1*630 i ann 1,200 1,000 7 800 19 Ann 7,020 1,770 1 240 950 QQC 28...... l',630 2,780 1,700 1 OEA NOTE. Stage-discharge relation affected by ice Jan. 5 to Mar. 1, 1919; discharge estimated on basis of gage heights corrected for effect of ice by means of two discharge measurements, observer's notes, and weather records. State-discharge relation affected by ice Dec. 14, 1919, to Mar. 25, 1920; discharge estimated from gage heights corrected for effect of ice, by three discharge measurements, observer's notes, and climatic records. Discharge estimated Aug. 15,26,27,1920, by comparison with flow in other basins. SAGO BIVEB BASIN. Monthly dischafgeofSacQ River at Cornish, Maine, for the years ending Sept. SO, 1919 oJtrf 1920. [Drainage area, 1,300 square miles.] Discharge in second-feet. Eun-ofl Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 5,100 2,150 3,040 2.34 2.70 3,860 2,040 3,010 2.32 2.59 4.380 1,630 2,770 2.13 2.46 3,900 2,000 2,600 2.00 2.31 2,800 1,200 1,600 1.23 1.28 March ...... 13,300 1 440 4,510 3.47 4.00 April...... 13,100 3,860 6,100 4.69 " 5.23 May...... 8,800 3,370 5,040 3.88 4.47 4,740 1,350 2,350 1.81 2.02 July...... 1,530 775 1,170 .900 1.04 1,100 530 866 .666 .77 1,930 650 1,190 .915 1.02 13,300 530 2,860 2.20 26.89 1919-20. 1,770 1,100 1,460 1.12 1.29 4,840 1,990 3,340 2.57 2.87 3,830 1,550 2,550 1.96 2.36 1,550 1,050 1,290 .992 1.14 1,300 860 1,150 .885 .95 March...... 10,800 920 3,750 2.88 3.32 April...... 14,000 7,600 11,300 8.69 9.70 May...... 12,000 5,350 7.320 5.63 6.49 June...... 5,010 1,610 2,810 2.16 2.41 July...... 1,550 851 1,170 .900 1.04 1,770 788 1,050 .808 .93 1,240 634 942 .725 .81 The year...... 14,000 634 3,170 2.44 33.21 SAGO RIVER AT WEST BUXTON, MAINE. LOCATION. At hydroelectric plant of Cumberland County Power & Light Co., at West Buxton, York County. DRAINAGE AREA. 1,550 square miles. RECORDS AVAILABLE. October 19,1907, to September 30, 1916, and January 1, 1919, to September 30,1920. GAGES. One in pond above dam; another in tailrace of power house. CHANNEL AND CONTROL. Crest of concrete dam about 300 feet long. DISCHARGE. Flow over dam and through rated wheels of power plant determined by- means of hourly gage readings. JOE. Stage-discharge relation not affected by ice. REGULATION. Distribution of flow somewhat affected by several power develop ments above the gage. OOOPERATION. Records furnished by Cumberland County Power & Light Co., Port land, Maine. 68 SURFACE WATER SUPPLY, 1919-1920, PART I. Dctily discharge, in second-feet, ofSaco River at West Buxton, Maine, for Sept. SO, 1919 and 1920. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. 1919. 3,530 2,810 1,750 14,100 4,660 5,920 1,660 .1,250 2. 3,500 2,440 1,170 12,800 4,900 5,630 1,780 990 3. 3,350 2,720 2,230 11,800 5,110 5,000 1,630 738 4. 3,040 2,450 2,200 10,700 4,630 4,520 1,190 1,200 6. 2,710 2,490 2,100 9,630 5,210 4,150 1,160 1,200 6. 3,100 2,330 2,980 5,230 3,900 652 1,150 7. 2,840 2,280 3,560 8,480 5,040 3,580 1,560 1,160 8. 2,760 2,210 3,490 7,500 5,300 2,900 1,550 1,120 9. 2,800 1,810 3,580 7^030 5,320 3,300 1,500 1,080 10. 2,720 2,300 5,420 6,920 5,000 3,160 1,490 797 11. 2,590 2,210 5,220 6,660 4,540 3,330 1,500 1,090 12. 2,380 2,110 5,060 6,710 5,030 3,050 1,330 1,160 13. 3,060 1,880 5,030 6,720 4,920 3,000 681 1,070 14. 2,530 1,960 4,150 7,030 4,710 2,920 1,300 1,080 15- 2,850 1,670 3,940 7,110 4,470 2,460 1,670 915 16. 2,750 1,240 3,420 7,070 4,200 2,730 1,620 709 17. 2,710 2,100 3,700 8,260 4,100 2,440 1,250 682 18. 2,630 1,920 3,510 ,8,560 4,680 2,240 1,300 1,020 19. 2,130 2,070 4,100 7,960 6,040 2,670 1,030 956 20. 2,520 1,490 5,240 7,340 6,240 2,650 1,100 857 21. 2,540 1,570 6,640 7,380 6,340 2,520 1,350 813 22. 2,440 1,230 7,670 6,920 6,580 2,040 1,360 863 23. 2,410 1,470 8,250 6,460 8,730 2,350 1,300 735 24. 2,^20 1,940 9,340 6,120 9,010 2,150 1,050 25. 3,880 1,800 9,220 e;ioo 9,240 2,190 1,220 26...... 3,580 1,800 8,870 5,940 9,990 1,890 974 841 27...... 3,800 1,790 8,520 5,310 9,900 1,950 977 925 28...... 3,530 1,490 9,390 5,440 9,360 1,350 1,310 830 29...... 3,340 12,400 5,190 8,620 1,260 1,370 840 30...... 3,200 12,900 5,080 7,680 1,550 1,290 810 31...... 3,100 14,200 6,880 1,210 Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. 1919-20. 1,650 1,690 4410'4,520 1,350 1,140 1,000 15,600 15,100 6,210 1,830 607 1,330 2,250 2,170 1,350 1,050 15,400 14,000 5,830 1,860 1,270 1,440 3,270 4.420 1,570 1,220 1,050 15, ICO 13,300 5,360 1,380 1280 1,130 3,130 3,830 1,020 1,310 1,160 14,500 12,200 4,940 1,270 1,270 554 3,480 3,560 2,150 1,420 1,140 13,600 11,600 4,600 1,220 1,270 6.. 1,550 3,940 3,350 1,550 1,250 1,020 14,300 10,800 4,690 1,800 1,280 7.. 1,450 3,830 2,750 1,170 1,240 1,420 13,600 10,100 5,350 2,180 778 8.. 1,560 3,720 3,210 1,350 1 110 1,610 12,500 9,520 4,690 1,540 737 9.. 1,560 3,270 2,940 1,490 1,240 2,080 11,600 9,490 4,550 1,440 1,400 10. 1,650 3,760 3,020 1,270 1,400 1,820 10,800 9,510 4,710 1,420 1,340 11.. 1,450 3,370 3,610 807 1,320 2,820 10,300 9,080 5,460 825 1,270 12.. 1,000 3,570 3,770 2,020 1,460 2,720 10,300 9,040 4,260 1,400 1,190 13.. 2,170 3,810 3,360 1,800 1,380 3,060 11,200 8,930 3,780 1,340 1,230 14. 1,510 4,640 3,740 1,450 1,000 4,100 14,500 8,630 3,670 1,450 958 15- 1,410 4,800 4,160 1,410 1,220 4,360 14,600 3,340 1,310 783 16.. 1,540 4,630 3,620 1,480 1,180 5,160 16,300 7,640 3,260 1,240 2,080 17.. 1,700 5,040 3,330 1,290 1,220 5,340 16,400 7,530 3,010 1,010 2,160 18.. 1,700 4780 2,970 946 1,320 6,100 15,700 7,020 3,200 1,020 2,260 19. 1,370 4,500 2,750 1,460 1,340 6,020 15,200 6,540 2,700 1,610 2,300 20. 2,350 4,240 2,300 1,450 1,020 5,820 14,400 6,210 2,800 1,250 2,070 21. 1,950 4,000 1,450 1,460 1,100 5,180 14,200 5,950 2,830 1,640 1,620 22. 1,800 3,590 2,780 1,390 1,020 5,300 14,900 7,020 2,150 1,550 1,420 23. 1,820 3,010 2,190 1,360 1,290 5,160 15,700 8,310 2,200 1 800 1,590 24. 1,860 3,720 2,440 1,170 1,360 5,670 17,400 8,540 2,740 1,700 1,520 25. 1,590 3,480 1,930 910 1,200 6,930 16,700 8,790 2,760 1,550 1,420 26. 1,460 3,400 2,440 1,380 1,140 8,040 17,000 8,960 2,240 1,700 1,420 27. 2,420 3,100 1,950 1,230 1,270 10,300 15,600 8,620 1,970 1,720 1,390 28. 1,970 3,540 1,900 1,320 897 13,300 15,000 8,300 2620 1 590 947 29. 2,080 3,230 2,420 1,400 1,000 14,300 16,700 7,800 2,330 1,500 694 30. 2,110 3,120 2,050 1 330 14,300 15,900 6,920 3,320 1,280 1,380 31. 2,070 1,860 1,400 14,900 6,740 1200 1,300 SAGO BIVJJR BASIN. Monthly discharge of Saco River at West Buxton, Maine, for the years ending Sept. SO , 1919 and 1920. [Drainage area, 1,550 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1919. January- 3,880 2,130 2,940 1.90 2.19 February ...... 2,810 1,230 1,980 1.28 1.33 14,200 1,170 5,780 3.73 4.30 April...... 14,100 5,080 7,700 4.97 5.54 May...... 9,990 4,100 6,180 3.99 4.60 5,920 1,260 2,960 1.91 2.13 July...... 1,780 652 1,300 .839 .97 1,260 682 960 .613 .71 2,470 683 1,410 .910 ,1.02 1919-20. 2,420 554 1,650 1.06 1.22 5,040 1,690 3,660 2.36 2.63 4,520 1,450 3,000 1.94 2.24 January. ... 2,170 807 1,400 .903 1.04 1,460 897 1,220 .788 .85 March ...... 14,900 1,000 5,230 3.37 3.88 April...... 17,400 10,300 14,500 9.35 10.43 May...... 15,100 6,740 9,050 5.83 6.73 6,210 1,970 3,720 2.40 2.68 July.. . . 2,180 825 1,470 .948 1.0» 2,300 607 1,360 .877 1.01 1,980 785 1,340 .865 .97 The year ...... 17,400 807 3,960 2.55 34.77 OSSIPEE RIVER AT CORNISH, MAINE. LOCATION. At highway bridge in Cornish, York County, 1| miles above confluence with Saco River. DRAINAGE AREA. 455 square miles (revised from map compiled by Maine Water Power Commission). RECORDS AVAILABLE. July 5,1916, to September 30,1920. GAGE. Chain attached to bridge; read by O. W. Adams. DISCHARGE MEASUREMENTS. Made from bridge. CHANNEL AND CONTROL. Channel covered with sand and gravel; control somewhat shifting. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 6.20 feet at 4 p. m. March 29 (discharge, 4,660 second-feet); minimum stage recorded, 0.36 foot on morning and afternoon of September 1 (discharge, by extension of rating curve, 219 second-feet). Maximum stage recorded for the year ending September 30, 1920, 6.70 feet at 7 a. m. April 24 (discharge, 4,860 second-feet); minimum stage recorded, 0.34 foot at 4 p. m. September 21 (discharge, by extension of rating curve, 216 second-feet). 1916-1920: Maximum stage recorded, 7.25 feet at 6 a. m. June 18,1917 (discharge by extension of rating curve, 6,480 second-feet); minimum open-water stage re corded, 0.34 foot on September 21, 1920 (discharge by extension of rating curve, 216 second-feet). ICE. Ice forms to considerable thickness and stage-discharge relation is .seriously affected during most winters. REGULATION. Flow regulated by dam at outlet of Great Ossipee Lake. ACCURACY. Stage-discharge relation changes occasionally at times of high water. Rating curves used for 1919 and 1920 well denned between 400 and 5,000 second- feet. Gage read to half-tenths once a day; read to hundredths twice a day begin ning September 18, 1919. Daily discharge ascertained by applying rating table to daily gage height with corrections for effect of ice. Records good. 70 SURFACE WATER SUPPLY, 1919-1920, PART I. Discharge measurements of Ossipee River at Cornish, Maine, during the years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 191?. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Get. 25 1 QA 651 J.W. Moulton...... 02.55 434 Mar. 5 ...do...... 02.90 337 1919. 30 ...do...... 6.22 4,670 02.58 1,050 Apr. 2 ...do...... 5.44 3,560 Sept. 18 1 A.1) o Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Ossipee River at Cornish, Maine, for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1,400 720 1,120 1,730 920 480 3,960 1,080 1,400 432 398 219 2...... 1,240 750 1,000 1,910 885 500 3,460 1 240 1,160 432 398 . 267 3...... 1,160 780 920 1,910 885 500 3,000 1 400 1,040 415 490 271 4...... 1,120 750 850 1,820 920 600 2,550 1*.400 940 432 470 277 5...... 1,000 720 850 1,730 QOA fififi 2,180 1 400 710 432 450 277 6...... 1,120 720 850 1,640 Q&n 920 2 inn I oon 398 415 450 267 7...... 1,080 720 920 1 400 oon 1,000 2,090 1,320 770 432 450 249 8...... 1,080 780 850 1*400 920 920 1,820 1,400 800 432 432 267 9...... i fun 780 750 MOO a fin 1,000 1,910 1 400 800 432 432 287 10...... 1,000 780 660 1,250 750 1,160 1,820 1*400 740 450 432 338 11...... 920 780 720 1,200 690 1,240 1,820 1,240 800 432 398 350 12...... 885 780 7an 1,200 660 1,240 1,820 1 240 770. 415 398 415 13...... SI P* 780 tJKfi 1,200 600 1 1 AA 1,910 1 240 770 415 365 AQft 14...... 815 780 660 1,200 550 1,120 1,910 1*160 630 415 350 <£QA 15...... 750 720 920 1,150 lot 1 040 1,820 1,120 655 415 326 510 16...... 720 780 1,000 1 1 ctfi 525 i nan 1 900 1,010 680 432 300 510 17...... 660 780 920 1 9*ui 500 1 9in 2 nort 1,040 630 415 312 AQTt 18...... 700 850 885 1,200 480 1,320 2,090 1,560 580 415 312 510 19...... 720 1 400 09n 1,100 CArt 1,820 2 000 1,910 605 398 300 510 20...... 660 1*,480 920 1,050 525 1,910 1*820 1,910 605 398 300 470 21...... 660 1 400 920 1 *780040 KoK 2 AQft 1 7on i TQn 630 398 300 AStt 22...... 650 1,'350 1,080 COK 2 1 on 1,560 1,910 eon 450- 300 432 23...... 680 1 inn 1 240 760 500 2 OCA I KCft 2 'ran 605 470 qno 450 24...... 660 1 9Al\ 1 400 1,560 500 q nan 1 400 3 AA/V 555 450 298 450 25...... 600 1 240 1*480 1 KfU\ CAfl 3 nan 1*400 3,460 510 415 287 AKn 26...... 600 1,160 1,910 1,240 480 2,960 1,320 3 QAA AQfl 415 987 450 27...... 600 1,120 1,910 1 1 AA 500 2 760 1,240 2,560 470 398 287 450 28...... 600 1,080 1,820 1 040 2'oon 1 240 2 AOf\ 470 9QC 9C7 432 29...... 660 1,160 1,730 1*040 4,660 1*240 1,910 450 OQQ 9H7 499 30...... 720 1,160 1,560 3 Gfift 4,500 I'.ieo 1,910 450 3OQ 987 415 31...... 780 1,730 920 4.360 1.560 398 242 SAGO RIVER BASIN. 71 Daily discharge, in second-feet, of Ossipee River at Cornish, Maine, for the years ending Sept. 30,1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar, Apr. May. June. July. Aug. Sept: 1919-20. 1...... OQQ 770 1,560 430 460 370 4 360 4,060 1,260 $18 380 380 2...... 393 940 1,560 480 450 360 3)760 3,760 1,190 495 365 366 3...... 415 940 i i»fin 370 Ann 350 3,670 3,490 1,050 475 350 338 4...... 398 905 1 480 370 44fi 350 3 ACW1 3,220 980 475 350 261 5...... 1Q9 0715 l)320 380 440 MERRIMACK RIVER BASIN. PEMIGEWASSET RIVER AT PLYMOUTH, N. H. LOCATION. At two-span highway bridge in Plymouth, Grafton County, three- fourths mile below mouth of Bakers River. DRAINAGE AREA. 615 square miles. RECORDS AVAILABLE. January 1,. 1886,5 to September 30, 1920. GAGES. Vertical staff gage in three sections; two lower sections about 40 feet above the bridge; upper section on bridge abutment; used since June 30, 1907. Chain gage on upstream side of bridge used from September 4,1903, to June 30,1907. DISCHARGE MEASUREMENTS. Made from upstream side of bridge at ordinary and high stages. At extremely low stages measurements made by wading. CHANNEL AND CONTROL. Right channel is rocky and practically permanent; left channel covered with fine gravel which shifts occasionally. Control section for low stages is gravel bed of river and has changed somewhat at various times. At high stages the banks are overflowed below the bridge and the control issomewhat indefinite. EXTREMES op DISCHARGE. Maximum stage recorded for the year ending Septem ber 30, 1919, 12 feet at 7 a. m. May 23 (discharge, 14,100 second-feet); minimum discharge, 60 second-feet, August 12. Maximum stage recorded for the year ending September 30, 1920, 13.5 feet at 7 a. m. April 14 (discharge, 16,200 second-feet); minimum discharge 130 second- feet January 20 (stage-discharge relation affected by ice). 1903-1920: Maximum open-water stage recorded, 15.42 feet at 7 a. m. March 28, 1913 (discharge from extension of rating curve, 18,700 second-feet); a flood stage of 24.0 feet was recorded April 15, 1895 (discharge from extension of rating curve, about 30,200 second-feet). Minimum discharge 60 second-feet on Sep tember 21, 1913, and August 12,1919. ICE. River freezes over, and stage-discharge relation is usually affected by ice from December to March. REGULATION. Several small ponds on Bakers River and other tributaries but prac- cally no storage regulation. At very low stages the paper mill at Livermore Falls is obliged to shut down several times daily and at these times fhe ponding of water affects the distribution of flow at Plymouth. ACCURACY. Stage-discharge relation for low stages has changed at various times and several different rating curves have been used, these different rating curves all coinciding for stages above 2,000 second-feet, above which point the stage-dis charge relation is apparently permanent. Rating curves well defined below 15,000 second-feet. Gage read twice daily from March 22,1919, to September 30', 1920; from October 1, 1918, to March 21, 1919, gage was read twice daily six days a week and occasionally once on Sundays. Daily discharge ascertained by applying rating table to daily gage height, with corrections for effects of ice during winter. Discharge on Sundays when gage was not read estimated by hydrograph comparisons. Records good. COOPERATION. Gage-height records from October 1,1908, to March 21,1919, furnished by Proprietors of Locks and Canals on Merrimack River. 8 No discharge measurements were made until September, 1903, and it is considered unsafe to appl^ the rating curve developed after that date to gage heights previously obtained. MEBBIMACK BIVEB BASIN. 73 Discharge measurements of Pemigewasset River at Plymouth, N. H., during the years ending Sept. SO, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by licigut* charge. 1918. Feet. See.-ft. 1919. Feet. Sec.ft. No?. 18 H. "W. Fear...... 2.88 2,180 Aug. 11 0.64 96 1919. 12 .....do...... 37 60 Jan. 24 H. W. Fear...... o2.79 965 12 .....do...... 74 200 Feb. 21 M. R. Stackpole...... ol.44 327 Sept. 24 M. E. Stackpole...... 1.83 925 Mar. 22 K. H. Suttie...... 4.28 4,040 1920. 29 .....do...... 11.68 fQ 7nA Jan. 26 o2.05 284 29 .....do...... 9.20 10 400 Feb. 24 H.S. Price...... a2.23 169 30 .....do...... 4.99 4,'900 July 13 1.25 617 Apr. 12 .....do...... 7.85 8,610 .86 302 13 C. H. Pierce...... 5.53 6,460 Sept. 17 M. E. Stackpole...... 1 fiQ 886 o Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Pemigewasset River at Plymouth, N. H.,for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 780' 1...... 1,360 3,310 940 895 390 2,450 1,720 1,090 434 89 255 2...... 1,110 2,200 756 1,170 1,050 1,400 2,030 3,130 927 392 118 300 3...... 1,030 1,700 859 1,530 840 3,120 1,770 3.520 873 380 100 215 4...... 1,340 1,450 877 1.310 780 2,320 1,720 2,610 786 ' 235 175 235 5...... 1,070 1,430 859 980 680 1,870 1,670 3,130 714 320 158 175 6...... 3,550 1,450 714 980 620 2,650 1,670 3,550 650 300 195 166 7...... 6,240 1,200 931 1,100 540 3,240 2,300 2,450 531 631 195 158 8...... 2,900 1,130 1,080 1,400 500 2,370 4,430 2,820 594 434 175 89 9...... 2,050 1,050 1,260 1,450 470 2,300 3,650 2,450 714 344 112 2,250 10...... 1^600 1^130 1,030 1,050 440 2,900 3,350 1,980 1,180 320 112 1,220 11...... 1,360 1,200 742 780 440 2.590 2,630 1,880 714 240 166 891 12...... 1 150 1,010 895 640 420 1 770 8,320 1,720 666 240 146 1,840 13...... 1,080 895 1,090 720 430 1,33.0 5,540 1,620 531 124 138 4,590 14...... 1 130 826 1,050 860 410 895 3,860 1 570 447 215 124 1,980 15...... 1,010 826 2,060 1,100 390 877 3,000 1,570 475 205 100 1,070 16...... 859 728 3,260 1,050 380 850 2,560 1,370 531 158 78 819 17...... 756 1,130 1,840 940 370 714 2,610 1,370 503 260 112 622 18...... 850 2,100 1,200 840 360 700 3,400 8,510 936 235 215 650 19...... 1,150 3,020 895 740 340 1,560 2,970 4,500 622 118 195 531 20 1,080 2 OKA SOfi 660 360 1,650 2,560 2,770 517 89 195 475 21...... 1,680 **«> nwi 931 620 330 2,820 2,400 2,320 503 112 225 434 22...... 1 SfVl 1,650 1,030 560 340 4,280 2,270 2,820 392 138 138 475 23...... 1,220 1,430 5,190 500 340 3,020 2,170 13,800 310 344 100 873 24...... 1,070 1,240 4,440 820 350 2,950 2,200 6,110 392 368 124 909 25...... 895 1,070 3,680 2,400 390 2,630 2,610 3,860 215 280 185 827 26...... 913 976 2,920 1,650 410 2,250 2,090 2,970 310 225 300 1,030 27...... 1,640 756 1,980 1,400 390 2,770 1,820 2,450 368 130 130 891 28...... 1,470 895 1,560 1,200 400 10,100 1,770 2,000 1,570 146 146 746 29 1,170 1,050 1,310 1 '900000 12,600 1,790 1,670 714 124 162 559 30...... 1,090 1,260 1,070 4,950 1 ssn 1,420 594 100 215 503 31...... 5.360 895 840 3.400 1.200 112 175 74 SUKFACB WATER SUPPLY, 1919-1920, PAET I. Daily discharge, in second-feet, oj Pemigewasset River at Plymouth, N. H., for the years ending Sept. SO, 1919 and 19%Q Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 447 3,600 4,030 475 170 14TI 3,470 4,080 1,400 578 350 381 2...... 422 4,920 2,350 430 210 170 3,090 3,500 1 400 437 449 370 3...... l.Ofl) 4,180 1,670 400 200 195 3,180 3,350 1,360 473 403 350 4...... 2,070 2,660 1,220 330 220 220 3,450 3,370 1,170 370 340 330 5...... 1,420 2,270 1,370 285 145 94TI 2,850 2,920 1,010 491 330 302 6...... 1.220 2,030 1,390 255 160 44H 8,160 2,800 2,280 543 231 279 7...... 2,800 1,770 1,090 275 320 750 4,030 3,350 2,480 414 311 224 8...... 1,670 1,650 1,200 265 260 1,100 2,820 3,520 2,020 403 288 255 9...... 1,180 1,550 1,110 300 220 1 300 2,030 7,830 1,600 403 182 414 10...... 1,530 1,470 1,920 O1 A 195 1,150 1,770 5,930 1,240 403 224 284 11...... 1,570 1,370 1,930 255 180 1,020 1,980 4,080 1,070 392 224 725 12...... 1,420 1,520 1,620 290 170 810 2,140 3,370 895 350 1,050 665 13...... 1.090 6,610 1.500 310 180 1,100 4,080 2,820 810 504 859 976 14...... 927 6,850 1,770 270 195 2,350 14,900 2,510 725 491 571 2,820 15...... 855 3,450 1,720 9fin 220 3,400 6,330 2,460 650 437 695 1,310 16...... 837 2,350 1,280 9fin 230 3,300 5,560 2,420 725 680 557 802 17...... 3,270 2,030 990 270 220 2,550 6,430 2,720 755 414 491 755 18...... 1,920 1,790 900 150 210 2,200 6,110 3,210 725 392 479 695 19...... 1,370 1,650 sfln 210 las ?100 4,770 3,260 748 461 350 976 20...... 1,130 1 480 850 130 170 2,000 6,060 3,310 740 1,510 330 895 21... 972 1,480 830 235 220 1,960 6,890 3,230 620 770 330 665 22...... 1,620 1,280 sin 235 195 1,920 10,800 7,670 740 578 330 517 23...... 1,770 1,550 arm 220 245 1,940 8,550 5,130 710 578 543 461 24...... 1,300 i 4sn 850 260 205 2 $50 9,170 3,840 665 786 491 437 25...... 1,130 1,200 arm 200 220 4*450 6,000 3,090 467 710 370 414 26...... 1,010 1,310 640 300 220 7,000 4,350 2,850 467 606 340 403 27...... 1,220 1,960 760 245 195 10,900 4,130 2,650 420 437 302 330 28...... 1,530 1 740 run OQE 195 12,900 4,870 2,540 381 392 176 350 29...... 2,450 l'320 580 285 160 6.980 8,510 2,410 403 370 188 665 30...... 1,620 2,560 560 265 4', 500 5,300 1,950 437 350 207 755 31...... 1 ' 740 NOTE. Stage-discharge relation affected by ice Jan. 5, to Mar. 2,1919, and Dec. 18,1919, to Mar. 27,1920; discharge-for these periods based on gage heights corrected for effect of ice by means of discharge measure ments, observer's notes, and weather records. Gage not read on Sundays prior to Mar. 23,1919. Discharge estimated for days when gage was not read by hydrograph comparison with White River. Monthly discharge of Pemigewasset River at Plymouth, N. H., for the years ending Sept. 30, 1919 and 1920. [Drainage area, 615 square miles.] Discharge in second-feet. Run-off Month. Per in Maximum. Minimum. Mean. square inches. mile. 1918-19. October...... 6,240 756 1,640 2.67 3.08 November...... 3,310 728 1,430 2.33 2.60 5,190 714 1,560 2.54 2.93 2,400 500 1,040 1.69 1.95 February ...... 1,050 330 484 .787 .82 March...... 12,600 390 2,820 4.59 5.29 Anril...^...... 8,320 1,570 2,780 4.52 5.04 May...... 13,800 1,200 3,060 4.98 5.74 June...... 1,570 215 646 1.05 1.17 July...... 531 89 247 .402 .46 August ...... 300 78 155 .252 .29 September...... 4,590 89 863 1.40 1.56 The year...... 13,800 78 1,400 | 2.28 30.93 1919-20. 3,270 422 1,440 2.34 2.70 November...... 6,850 1,200 2,370 3.85 4.30 4,030 440 1,240 2.02 2.33 475 130 274 .446 .51 February...... 320 145 204 .332 .36 March...... 12,900 140 2,770 4.50 5.19. April...... 14,900 1,770 5,390 8.76 9.77 May...... 7,830 1,560 3,480 5.66 6.52 2,480 381 970 1.58 1.76 July...... 1,510 350 518 .842 .97 August...... 1,050 176 399 .649 . .75 2,820 224 627 1.02 1.14 The year...... 14.900 130 1,640 2.67 36.30 MEERIMACK EIVER BASIN. 75 MERRIMACK RIVER AT FRANKLIN JUNCTION, N. H. XOCATION. At covered wooden bridge of Boston & Maine Railroad 1 mile below con fluence of Pemigewasset and Winnepesaukee rivers, at Franklin Junction, Mer- rimack County. DRAINAGE ABBA. 1,460 square miles. RECORDS AVAILABLE. July 8, 1903, to September 30, 1920. GAGE. Chain gage fastened to floor of bridge on upstream side over the west channel; read until March 31,1919, by F. R. Roers, and by L. A. Hildreth beginning April 14, 1919. A gage painted on the downstream right-hand side of the center pier is considerably in error for low stages. DISCHARGE MEASUREMENTS. Made from upstream side of bridge. CHANNEL AND CONTROL. Composed of coarse gravel and boulders; fairly permanent. EXTREMES OP DISCHARGE; Maximum stage recorded for the year ending September 30t 1919, 16.2 feet at 5.30 p. m. May 23 (discharge, 24,900 second-feet); minimum stage recorded, 3.7 feet at 7.30 p. m. August 3, and 6.15 a. m. August 4 (dis charge, 840 second-feet). Maximum stage recorded for the year ending September 30, 1920, 17.5 feet at 4.35 p. m. April 14 (discharge, by extension of rating curve, 27,800 second-feet); minimum discharge, 800 second-feet February 22 and 23 (stage-discharge relation affected by ice.) 1903-1920: Maximum stage "recorded, 19.5 feet at 5 p. m. April 21, 1914 (dis charge, by extension of rating curve, 32,300 second-feet); minimum stage recorded, 3.30 feet Oct. 4,1903 (discharge, by extension of rating curve, 250 second-feet). ICE. Stage-discharge relation affected by ice for short periods during severe winters. REGULATION. Flow affected by storage in Winnepesaukee, Squam, and New Found lakes, and by the operation of mills above the station. ACCURACY. Stage-discharge relation subject to slight changes. Rating curves used are well defined between 1,000 and 8,000 second-feet and fairly well defined between 8,000 and 25,000 second-feet. Prior to April 14,1919, gage read to half- tenths once or twice daily, except on Sundays and numerous other days when gage was not read. Beginning April 14,1919, gage read to half-tenths twice daily. Daily discharge ascertained by applying rating table to mean gage height, with corrections for effect of ice. Records good since April 14, 1919, but poor before that date. Discharffe measurements of Merrimack River at Franklin Junction, N. H., during the year^ ending Sept. 30,1919 and 19W. Gage Dis Date. Made by- height. charge. 1919. Feet. Sec.-ft. Aug. 13 4.31 1,310 1820. Jan. 27 o5.59 1,280 July 12 4.42 1,340 « Stage-discharge relation affected bylce. 76 SURFACE WATER SUPPLY, 1919-1920, PAET I. Daily discharge, in second-feet, of Merrimack River at Franklin Junction, N. H.,for the years ending Sept. SO, 1919 and 1980. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 2,820 3,450 1,700 1,900 5,000 .2,970 3,450 1,470 980 98& 2...... 2,540 3,120 1,720 1,930 4,300 3,620 3,280 1,380 980 1,140 3...... 2,160 2,800 1,720 2,160 4,100 6,000. 2,970 1,300 900 1,140 4...... 2,280 2,540 1,720 2,680 4,000 4,130 2,820 1,300 980 1,300 5...... 2,040 2,680 1,620 2,800 3,900 4 480 2,680 1,140 1,060 1,220 6...... 5,000 2,680 1,620 2,540 4,000 5,600 2,540 1,220 980 1,140 Z...... 9,560 2,680 1,530 2,280 5,000 4,300 2,400 1,660 1,020 1,060 8...... 2,820 2,540 1,600 2,040 8,000 4,300 2,260 1,470 1,060 1,060 9...... 3,450 2,410 1,720 2,000 6,800 4,130 2,540 1,380 1,060 1,770 10...... 2,820 2,300 1,620 2,200 5,600 3,790 3,450 1,380 900 2,820 11...... 2,540 2,160 1,620 2,280 5,100 3,450 3,120 1,220 980 2,260 12...... 2,280 2,040 1,530 2,700 14,000 3,620 2,680 1,220 1,060 2,000 13...... 2,100- 2,040 1,440 2,410 9,000 3,450 2,400 1,060 1,220 5,020 14...... 2,040 1,820 1,440 2,160 6,410 3,280 2,260 1,020 1,140 3,450-' 15...... 2,040 1,930 2,000 , 1,820 ...... 5,600 3,120 2,000 1,220 1,220 2,130- 16...... 1,930 1,820 3,450 1,820 4,480 2,970;, 1,770 1,300 1,080 1,880 17...... 1,«30 2,100 2,970 1,820 4,840 2,970 1,770 1,380 l)020 1,770 18...... 1,820 2,410 2,160 1,820 6,000 9,140 1,770 1,300 1,080 1,770 19...... 1,930 3,790 1,800 1,800 5,600 9,560 1,770 1,220 1,060 1,860- 20;...... 2,000 4,480 1,800 1,750 4,660 6»000 1,560 1,140 1,220 1,380 21...... 2,040 4,480 2,040 1,750 4 480 4,840 1,560 1,140 1,220 1,300 22...... 2,680 4,130 2,300 1,750 4)308 7,460 1,660 1,220 1,140 1,380 23...... 2,280 3,120 2,540 1,750 3,790 22,700 1,380 1,300 1,080 1,560- 24...... 2,160 2,800 8,300 1,800 3,790 15,700 1,380 1,300 ,1,020 2,000 25...... 1,930 2,400 6,800 2,500 4,130 9,770 1,380 1,300 980 1,880 26...... 1,930 2,040 5,600 4,000 4,300 7,670 1,300 1,220 1,140 2,000- 27...... 2,400 1,720 4,130 2,540 ...... 3,280 6,620 1,380 1,020 1,060 2,000 28...... 2,280 1,700 2,820 2,280 3,120 5,800 1,560 1,060 1,140 1,560 29...... 2,280 1,720 2,400 2,160 3,120 5,020 1,770 1,140 1,140 1,380 30...... 2,160 1,720 2,160 2,040 ...... 3^120 4,480 1,560 980 1,060 1,560 81...... 4,840 2,040 1,930 3,960 1,060 9SO 1919-20. 1...... 1,380 4,840 7,670 1 &t£\ 1,300 1,100 8,300 10,600 3,280 1,560 1,300 1,380 2...... 1,380 6,000 5,020 1,400 1,900 1,000 7,670 9,350 3,120 1,560 1,300 1,300 3...... 1,380 7,250 3,620 1,500 1,650 1,209 7,460 8,720 2,820 1,470 1,380 1,220 4...... 3,450 4,840 2,970 1,550 1,300 1,150 8,510 8,300 2,540 1,380 1,380 1,220 5...'...... 2,260 4,130 2,820 2,000 1,200 1,050 7,250 7,460 2,540 1,220 1,380 1,060 6...... 2,130 3,960 2,680 2,000 1 400 1,050 13, 100 6,830 3,620 1,220 1,300 1,060- 7...... 3,120 3,620 2,540 1,550 t' ASI\ 1,050 10,200 6,830 4 480 1,220 1,300 1,140 8...... 2,970 3,280 2,540 1 J.VI 1,050 1 Qftfl 7 040 7 460 3)960 1,380 1,220 1,220 9...... 2,260 3,120 2,820 1,550 1 400 2,100 5^400 9)560 3,450 1,380 1,140' 1,220 10...... 2,000 2,820 3,280 1,450 l)400 1,750 4 840 11,400 2,540 1,380 1,300 1,300 11...... 2,400 2,820 3,280 1,150 1,300 1,550 4,840 8,300 2,540 1,300 1,380 1,560 12...... 2,260 2,820 3,120 1,550 1,300 1,400 5.200 7,250 2,260 1,300 1,560 1,660 13...... 2,000 6,410 2,820 1,650 1,300 1,650 7460 6,410 2,130 1,470 2,130 2,400 14...... 2,540 12,700 2,820 1,550 1,200 2,100 26,400 5,800 2,000 1,560 2,260 5,200 15...... 2,000 8,090 3,450 1,550 980 4,000 15,800 5,400 2,000 1,560 1,770 3,450 16...... 2,000 4,480 3,450 1 450 980 4,800 11,700 5,400 2,000 1,560 1,770 2,680 17...... 3,280 3,960 2,820 1,300 1,200 4,480 12,700 5,200 2,130 1,560 1,660 2,000 18...... 3,620 3,620 2,540 980 1,200 3,620 11,700 5,400 2,130 1,220 1,560 1,880 19...... 2,540 3,450 2,680 1,200 1,150 4,130 10,200 5,600 2.260 1,300 1,560 1,770 20...... 2,260 3,120 2,820 1,400 1,200 3,620 11,000 5,400 2,000 2,260 1,450 2,000 21...... 2,260 2,680 2,540 1,400 1,100 3,120 12,300 5,600 2,000 2,260 1,400 1,770 22...... 2,260 2,820 2,540 1,450 800 2970 15,700 9,560 2,000 1,770 1,350 1,660 23...... 2,820 2,540 2,540 i 4nn 800 3,120 17,900 11,400 1,880 1,660 1,350 1,560 24...... 2,540 2,820 2,000 980 1,000 3,620 17,900 7,040 2,000 1,770 1,560 1,470 25...... 2,260 2,680 l)770 1,150 1,200 5,600 13,600. 6,830 1,880 1,660 1,380 1,470 26...... 1,770 2,680 2,000 1,200 1,100 8,510 10,200 6,000 1,770 1,560 1.380 1,220 27...... 2,000 3,790 1,770 1,300 940 13,600 9,140 5,400 1,660 1,560 1,300 1,300 28...... 2,680 4,130 1,660 1,200 1,100 19,200 11,900 5,020 1,660 1,380 1,220 1,380 29...... 3,450 3,450 1,650 1,300 1,000 17,600 19,700 4,840 1,560 1,300 1,060 1,470 30...... 3,120 3,790 1,700 1,200 10,800 13,100 4,130 1,560 1,300 1,080 2,130 31...... 3,120 1,900 1,300 ...... 9,770 3,790 1,380 1,220 NOTE. Discharge on Sundays prior to April 14, 1919, and other days when gage was not read estimated by comparison with records at several other stations. Stage-discharge relation affected by ice Dec. 29, 1919, to Mar. 16,1920; discharge based on gage heights corrected for effect of ice by means of one discharge measurement, observer's notes, weather records, and comparison with measurements at other stations in the Merrimack River basin. Discharge estimated Jiug. 20-23, 1920. MEBBIMACK BSVEE BASIF. Monthly discharge of Merrbnack River at Franklin Junction, N. Hi, far me y&ars ending Sept. SO, 1919 and 1920. [Drainage area, 1,460 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 191&-19. 9,560 1,820 2,680 1.84 2.12 4,480 1,700 2,690 1.77 1.98 December...... 8,300 1,440 2,510 1.72 1.98 4,000 1,750 2, 170 1.49 1.72 1,260 .863 .90 March...... 5,270 3.61 4.16 April...... 14,000 3,120 5,130 3.51 3.92 May...... 22,700 2,970 5,960 4.03 4.70 3,450 1,300 2,150 1.47 1.64 July...... 1,660 980 1,240 .849 .98 1,220 900 1,060 .726 .84 5,020 980 1,790 1.23 1.37 The year...... 22,700 2,820 1.93 26.31 1919-20. October...... 3,620 1,380 2,440 1.67 1.92 12,700 2,540 4,220 2.89 3.22 7,670 1,650 2,830 1.94 2.24 January...... 2,000 980 1,410 .966 Lit 1,900 800 1,200 .822 .89 March...... 19,200 1,000 4,600 3.15 3.6S 26,400 4,840 11,300 7.74 8.64 May. .. . . 11,400 3,790 6,980 4.78 5.51 June...... 4,480 2,390 1.64 1.83 July...... 2,260 1,500 1.03 Lift 2,260 ijoeo 1,430 .979 1.13 5,200 1,060 1,740 1.19 1.33- 26,400 800 3,500 2.40 32.64 NOTE. Monthly discharge for February and March, 1919, estimated on basis of 1.7 times discharge at Plymouth, plus the discharge from Lake winnepesaukee at Lakeport. MERRIMACK RIVER AT LAWRENCE, MASS. LOCATION. At dam of the Essex Co. in Lawrence, Essex County. DRAINAGE AREA. Total of Merrimack River basin above Lawrence, 4,663 square miles; net drainage area, exclusive of diverted parts of Nashua and Sudbury River and Lake Cocbituate basins, 4,452 square miles. RECORDS AVAILABLE. January 1, 1880, to September 30, 1920, COMPUTATIONS OP DISCHARGE. Accurate record is kept of the flow over the dam and through the various wheels and gates. This flow includes the water wasted into the Merrimack from the Nashua, Sudbury, and Cochituate drainage basins. Estimates of the quantity wasted from these basins is furnished by. the Metro politan Water and Sewerage Board of Boston, and subtracted from the quantity measured at Lawrence to obtain the net flow from the net drainage area of 4,452 square miles, used in tables of monthly discharge. DIVERSIONS. Practically the entire flow of the South Branch of Nashua River, Sudbury River, and Lake Cochituate is diverted for use by the Metropolitan water district of Boston. REGULATION. Flow regulated to some extent by storage in Lake Winnepesaukee. The low-water flow of the stream is aSected by operation of various power plants above Lawrence. STORAGE. There are several reservoirs in the basin. It is estimated that the water surface is about 3.5 per cent of entire drainage area. COOPERATION. The entire record has been furnished by R. A. Hale, chief engineer of the Essex Co., rearranged in form of climatic year by the United States Geological Survey. 78 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Merrimack River at Lawrence^ Mass., /or the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 7,604 4,931 5,267 4,112 5,185 5,406 20,163 6,718 7,626 3,306 2,529 518 2...... 6,281 6,126 6,542 6,366 4,590 8,890 16, 112 7,011 7,838 3,093 1,512 3,12O 3...... 5,390 4,461 4,972 6,749 5,770 11,276 13,515 7,942 6,823 3,072 219 2,304- 4...... 5.224 5,338 4,559 6,882 4.839 11,274 11,978 9,374 6,231 702 2,366 3,325- 5...... 3,431 4,361 4,415 6,513 4,605 11,291 10,997 9,538 5,734 1,888 2,464 3,16& 6...... 3,178 4,360 4,390 6,867 4,666 12,736 10,233 9,777 5,698 1,784 2,424 2,29ft, 7...... 5,494 4,221 2,942 6,110 4,476 14,162 10,582 10,506 4,440 3,424 2,394 756. 8...... 8.562 4,074 1,945 5,762 3,096 12,752 10,402 9,273 4,032 2,862 2,177 3,770» 9...... 7,272 2,839 5,106 5,615 3,292 10,811 11,364 8,686 5,569 2,671 1,205 3,201 10...^.. 5,776 2,239 4,657 5,257 4,654 15, 175 11,625 7,697 4,740 3,199 135 3,21$: 11...... 4,961 2,824 3,967 4,403 4,020 17, 195 10,909 7,217 6,189 3,302 1,965 3 491 12...... 3,081 3,486 3,856 3,803 3,591 15,439 10,641 9,274 6,807 2,074 1,976 4,300- 13...... 3.173 5,366 4,212 5,547 3,581 13,496 13,400 10, 715 6,106 360 2,061 2,699 14...... 4.998 4,108 2,920 4,530 3,528 11,647 15,059 11, 070 4,423 3,130 2,210 4,304 15...... 4,134 3,440 3,307 4,137 2,360 9,859 12,352 10,119 3,980 2,698 2,271 5,778, 16...... 3,827 2,741 8,880 4,320 2,905 8,516 11,558 9,016 5,474 2,377 1,317 4,553: 17...... 3,454 770 10,822 4,720 4 530 9,200 11,950 7,721 4,095 2,431 131 4,081 18...... 3,875 4,767 9,902 3,331 3,959 8,654 15,210 7,968 3,781 2,512 1,937 3,410» 19...... 2,870 5,876 8,349 3,265 3,681 10,806 14,714 14,482 3,779 1,683 2,304 3,418- 20...... 1,433 10,807 7,187 5,185 3,421 15,341 12,820 15,146 3,782 286 2,571 2,297 21...... 4,841 10,894 5,562 4,483 3,398 18,711 12,017. 12,296 2,319 3,096 2,348 364 22...... 4,177 9,489 5,233 4,096 1,023 20,692 10,658 11,805 2,367 2,879 2,510 3,047 23...... 3,729 7,234 7249 4,544 2,352 20,980 9,900 21,890 4,654 2,995 1,505 3,298 24...... 4,564 6,410 9470 6.228 4&9 20,175 8,739 33,081 3,353 9,030 190 2,927- 25...... 4,282 6,926 13,419 10,473 3^749 17,939 8,652 28,459 2^646 3,056 1,852 2,925. 26...... 2,935 6,207 15,247 11,094 4,445 16,110 8,327 22,263 3,174 2,001 2,304 3, 407 27...... 1,522 5,557 13,249 10,878 5,250 14,287 8,093 17,606 3,052 551 2,302 2,234 28...... 4,892 2,676 10,433 9,209 5^75 14,432 8,182 14, 715 1 867 3,007 2,294 521 29...... 4,330 6,217 8,149 8,009 30,902 7,342 12,476 701 2,824 2,415 3,897 30...... 4 272 3,861 7,235 6,947 38,245 6,888 10,078 4,084 2,616 1,544 3jl35 31...... 4,279 5,875 6,384 27,908 8,955 2,380 506 1919-20. 1...... 2,919 3,393 11,353 1,255 986 4,127 34,061 31,937 9,050 4,115 694 2 650 2...... 2,917 5,398 12,473 4,097 3,641 3 663 30,230 25,527 7,678 4,511 2,987 2,264 3...... 2,618 8,582 10,436 2,845 3,110 3 224 29,897 22,016 7 175 2,990 3,143 2,386- 4...... 1,718 9,777 8,070 1,226 2,950 3,190 29,872 20,033 6,605 3,564 2,982 1,725. 5...... 329 8,445 6,700 4,141 3,006 3,268 30,273 19,043 5,608 3,821 2,658 782, 8...... 3,697 8,252 5,306 3,084 3,150 3,349 31,122 17,794 7,313 5,253 2,763 1,182- 7...... 3,610 8,557 5,363 2,629 2,440 4,817 34,072 16, 148 10,650 4,282 1,652 3,168. 8...... 3,234 8,432 6,796 2,934 1,551 6,397 29,253 14,819 11,324 4,036 495 2,774 9...... 3,889 6,655 6,674 3,098 4,406 5,422 23,478 15,777 10,150 3,550 2,815 2,556 10...... 3,832 7,382 7,674 2,409 3,621 5,847 19,299 19,985 8,733 2,518 2,651 2,801 11...... 2,392 5,092 8,604 1,161 3,235 6,615 17,019 20,422 7,671 1,350 2,824 1,904 12...... 1,152 7,044 8,526 3,995 3,281 7,227 15,963 17,516 6,290 3,987 3,172 2,011 13...... 2,401 6,221 7,469 3,276 3,453 10,117 16,297 12, 191 5,637 3,771 3,150 4,172 14...... 4,593 10,306 7,677 2,672 2,495 13,192 25,295 13,432 6,835 3,504 2,287 5,56E 15...... 3,377 13,803 8,608 2,741 1,376 19,750 38,130 12,212 4' 877 3,511 4,329 7,443 1«...... 2,821 9,566 6,857 3,183 4,536 21,745 32,463 11,927 5,309 4,040 5,524 5,709 17...... 3,424 8,407 6,648 2,227 3,539 23,785 26,793 11,883 5,431 2,571 5,284 4,581 18...... 2,285 7,129 6,022 1,018 3,417 26,137 24,957 10,652 6,490 710 4,404 2,712 19...... 2,571 6,694 5,169 3,905 3,438 27,108 22,716 10,613 8,427 3,988 4,414 2,099 20...... 4,909 6,186 3,465 3,029 3,475 23,410 20,718 10,683 8,893 3,640 4,399 4,020 21...... 3,698 5,600 3,073 2,794 2,596 20,119 20,657 10,358 9,394 3,581 2,559 3,083 22...... 3,502 4,171 5,328 2,632 1,334 18,488 23,017 11,809 8685 3 403 2,160 3,403. 23...... 3,233 3,969 4,345 3,016 2,731 17,636 29,179 20,827 8,614 4,237 4,459 3,390 24...... 3,493 5,905 3,702 2,501 4,891 20,202 34, 107 23,906 8,401 2,359 3,534 3,294 25...... 2,385 5,194 1,725 1,123 3,433 27,193 34,306 20,043 7,606 2,050 3,418 2,076 26...... 1,834 5 222 5,015 4,059 3,171 32,853 29,377 16,475 6,065 4,393 3,122 783 27...... 4,561 )5,698 3,026 2,805 3 267 38,668 23,707 14.430 5,085 3 NOTE. The above tables show the actual flow at Lawrence; not corrected for water wasted by the Metro* . politaa Wator and Sewerage Board. MERRIMACK BIVEE BASIN. 79 Weekly discharge, in second-feet, of Mernmack River at Lawrence, Mass., for the ye&f» ending Sept. SO, 1919 and 1920. [Weeks arranged in order of dryness.] Wasting Measured into at Merrimaek From net Lawrence River drainage Per square Week ending Sunday (total from other area of mile of net drainage drainage 4,452 drainage area 4,663 basins (211 square area. square square miles. miles). miles). 1918-19. Aug.17,1919...... 1,704 18 1,686 Aug. 10,1919...... 1,881 W 1 866 Aug. 31,1919...... 1,888 30 1 858 Aug. 24,1919...... 1,909 13 1 896 Aug. 3,1919:...... 2,155 31 2,124 July 20,1919...... 2,160 13 2,147 Sept. 7.1919...... 2,212 112 2,100 July 27,1919...... 2,515 74 2,441 July 13,1919...... :...... 2,556 7 2,549 July 6,1919...... »2,561 21 2,540 Sept. 28.1919...... 2,623 57 2,566 June 29,1919...... 2,778 17 2,761 Feb. 23,1919...... 3,195 51 3,144 Nov. 17,1918...... 3,248 65 3,183 Sept. 21,1919...... 3,414 61 3,353 Oct. 20,1918...... 3.513 3,487 Feb. 16,1919...... 3,520 47 3,473 Sept. 14,1919...... 3,568 126 3,442 June 22,1919...... 3,657 3,631 Oct. 27,1918...... 3,721 3,695 Nov. 10,1918...... 3,919 50 3,S69 Dec. 15,1918...... 4,004 88 3,916 Dec. 8,1918...... 4,252 63 4,189 Jan. 19,1919...... 4,264 93 4 171 Feb. 9,1919...... 4,392 54 4,338 Nov. 3,1918...... 4,756 30 4,726 Dec. 1,1918...... 5,244 70 5,174 MarJ2,1919...... 5,319 190 5.129 Jan. 12,1919...... 5,402 136 5,266 June 15,1919...... 5,402 5,376 Oct. 13,1918...... 5,474 28 5,446 JuneS, 1919...... 5,828 31 5,797 Oct. 6,1918...... 5,898 74 5,824 Jan. 5,1919...... 6,247 163 6,084 Jan. 26,1919...... 6,543 151 6,392 Feb. 2,1919...... 7,315 103 7,212 May4,1919...... 7,637 109 7 528 Nov. 24,1918...... 7,925 128 7,797 Dec. 22,1918...... 7.991 150 7,841 May 11,1919...... 8,956 71 May 18,1919...... 9,412 177 9,235 Apr. 27,1919...... 9,484 137 9347 Dec. 29,1918...... 11,031 148 10,883 Apr. 13,1919...... 11,275 152 11 123 Mar. 9,1919...... 12,043 237 11 806 Mar. 16,1919...... 13,047 12,821 Apr. 20,1919...... 13,380 224 13,156 June 1,1919...... 13,388 127 13,261 Mar. 23,1919...... 14,912 265 14,647 Ajpr. 6,1919...... 15,844 166 15j678 May 25,1919...... 19,594 233 19,361 . Mar.30,1919...... 21,731 197 21,534 s*53 00o "g^gS S.spgg »g: .»§ SPSS s gsrgs »gg8i PPpSp" Prpgs -a-w aCO :::::: i : i : i . ! i ! i ! : : : : : I : : : i : : : : i : : : : : : : : : : :::::§ $%If s9 111111 ||m jjjjj iiiii Hm jUjl iiiii mil niiis i- § fei ^ ba 1-1 H* *-» M - ^ ;1 i : a ? t^ |^H*»-I l-i toMOioitooo oooooo^^ *>^»4-^O)cn 01 ^ ^ ^ ^ cc co co co co cocotoboco cccotototo tototototo tototototo "...... p MEREIMACK EIVEE BASIN. 81 Monthly discharge of Merrimack River at Lawrence, Mass., for the years ending Sept. SO, 1919 and 19ZO. Mean discharge in second-feet. Run-Off. Measured Wasting at into From net Per Month. Lawrence Merrimack drainage square Depth in Rainfall (total from other area mile inches on Per cent of in inches. drainage drainage of 4,452 of net drainage rainfall. area, 4,663 basins square drainage area. square (211 square miles. area. miles). miles). 1918-19. October...... 4,446 35 4,411 0.991 1.143 68.4 1.67 November...... 5,087 74 5,013 1.126 1.257 47.6 2.64 December...... 6,752 111 6,641 1.492 1.720 53.3 3.23 January...... 5,984 134 5,850 1.314 1.515 48.6 3.12 February...... , 3,945 64 3,881 .872 .908 32.8 2.77 March...... 15,301 240 15,061 3.383 3.900 82.1 4.75 April...... 11,479 161 11,318 2.542 2.836 116.7 2.43 May...... 12,351 149 12,202 2.741 3.160 57.7 5.48 June...... 4,512 27 4,485 1.007 1.123 , 62.4. 1.80 July...... ; 2,429 29 2,400 .539 .621 16.7 3.72 August...... 1,804 20 1,784 .401 .463 13.7 3.37 September...... 2,992 85 2,907 .653 .727 13.6 5.35 The year.... 6,448 94 6,354 1.427 19.373 4.8-2, 40.33 1919-20. October...... 3,146 34 3,112 0.699 0.806 29.2 * 2.76 November...... 7,464 129 7,335 1.648 1.840 32.3 5.69 December...... 6,165 241 5,924 1.331 1.535 89.8 1.71 January...... 2.738 200 2,538 .570 .657 26.5 2.48 February...... 2,962 210 2,752 .618 .666 12.2 5.47 March...... 18,844 672 18, 172 4.082 4.706 115.6 4.07 April...... 27.262 539 26,723 6.002 6.696 115.3 5.81 May...... 15,999 216 15,783 3.545 4.087 128.9 3.22 June...... 7,331 175 7,156 1.607 1.793 35.9 5.00 July...... 3,368 47 3,321 .746 .860 27.0 3.19 August...... 3,031 12 3,019 .678 .782 24.7 3.16 September...... 3,042 14 3,028 .680 .759 13.1 5.78 The year.... 8,445 207 8,238 1.850 25.187 52.1 48.34 NOTE. The monthly discharge in second-feet per square mile and the run-off in inches shown by the tables do not represent the natural flow from the basin because of storage. SMITH RIVER NEAR BRISTOL, N. H. LOCATION. At highway bridge in South Alexandria, 3 miles from Bristol, Grafton County. DRAINAGE ABE A. 78. 5 square miles (measured on Walker map). KECOKDS AVAILABLE. May 11, 1918, to September 30, 1920. GAGE . Vertical staff attached to downstream side of left abutment of highway bridge; read by Archie Flanders. DISCHARGE MEASUREMENTS. Made from downstream side of highway bridge or by wading. CHANNEL AND CONTROL. Channel rough and covered with boulders; control ledge rock and boulders 130 feet below gage. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 4.7 feet at 7.45 a. m. March 29 (discharge, by extension of rating curve, 1,510 second-feet); minimum stage recorded, 0.54 foot at 6.30 p. m. August 4 (dis charge, 5 second-feet). Maximum open-water stage recorded for the year ending September 30, 1920, 4.3 feet at 4.30 p. m. April 14 (discharge, by extension of rating curve, 1,310 sec ond-feet) (a gage height of 8.28 feet was recorded at 12.40 p. m. April 5, but the channel was obstructed by ice at the time); minimum stage recorded, 0.64 foot at 7 p. m. July 18 (discharge, 13 second-feet). 1918-1920: Maximum open-water stage recorded, 4.7 feet March 29, 1919 (dis charge, by extension of rating curve, 1,510 second-feet); minimum stage recorded, 0.54 foot August 4, 1919 (discharge, 5 second-feet). 102721 23 WSP 501 6 82 SURFACE WATER SUPPLY, 191&-1920, PART I. ICE. Ice forms to a considerable thickness during winter; stage-discharge relation affected. REGULATION. A few small mills above the gage, but no serious effect from their opera tion. Several small lakes in the basin but little if any storage regulation. ACCURACY. Stage-discharge relation changed slightly during high water of April, 1920. Bating curves used are well defined between 7 and 600 second-feet. Gage read to hundredths twice daily except during winter when it was read once a day. .Daily discharge ascertained by applying rating table to mean daily gage height, with corrections for effect of ice during the winter. Records good. Discharge* measurements of Smith River near Bristol, N. H., during the years ending Sept. 80, 1919 and 1920. Gage Dis Gage Dis Date. Made by- height. charge. Date. Made by- height. charge. 1918. Feet. Sec.-ft. 1919. Feet. Sec.-ft. Nov. 17 EC. W. Fear...... 1.10 57 Aug. 13 0.60 7.2 18 .....do...... 1.59 163 1920. 19 .....do...... 1.86 233 ol.W 31.» 1919. July 12 El. K.Hoyt...... 78 25.8 Jan. 25 .....do...... 197 12 .78 24.1 Feb. 20 M. B. Stackpole...... 01.14 38 .75 21.2 Mar. 21 2.73' 572 Sept. 18 M.E. Stackpole...... 84 29.4 .95 35.1 a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Smith River near Bristol, N. H., for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 188 116 98 204 100 275 780 112 98 24 7 15- 2...... 150 112 78 9li8 76 650 286 162 90 22 7 ia 3...... 127 102 102 282 58 516 252 245 82 21 6 31 4...... 116 86 86 OKA 52 542 245 177 72 15 41 5...... 110 82 BS 1Q* 62 466 232 210 63 13 6 27 6...... 106 76 108 145 54 442 222 183 58 18 7 20 7...... 127 74 136 OOA 46 434 207 167 55 41 9 14 8...... 138 72 172 340 35 426 363 204 56 33 8 Ifr 9...... 131 78 180 220 31 386 341 155 43 27 7 47 10...... 116 67 145 01 A 20 "KU. 289 131 28 24 7 5& 11...... 110 65 134 155 35 426 tA >i 148 23 22 7 56- 12...... 100 63 127 135 46 379 446 193 21 21 7 67 13...... 96 67 129 125 46 289 414 207 29 17 7 70° 14...... 92 63 Daily discharge, in second-feet, of Smith River near Bristol, N. H., for the years ending ...... : siw .Sept, SO, 1919 and 1S%& Continued. - , Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... t 22 268 1QQ 134 35 25 275 633 78 70 . 27 23 23 356 426 122 33 20 265 598 70 52 27 20 3...... J OQ 449 oo*- 116 19 in 265 589 67 48 24 18 4...... t 35 418 242 OS 11 in 280 4O4 62 66 22 16 46 375 213 76 34 35 920 462 72 41 20 15 6...... 4 65 311 69 32 40 730 JQQ 112 35 20 15 7...... ^ 62 282 183 53 30 40 717 430 137 29 20 16 8...... 52 222 157 46 45 690 466 120 26 18 20 46 193 164 JQ 32 50 667 520 100 23 18 22 10...... 46 175 238 50 31 50 624 80 21 18 21 11...... 41 162 193 52 vi 55 602 72 21 25 42 12...... 40 255 177 49 35 65 585 326 64 23 35 35 13...... 38 375 207 46 33 85 555 145 59 30 38 41 14...... ] 34 390 222 43 32 160 1,300 242 56 25 44 52 15...... 41 326 202 45 30 520 1,100 202 49 20 39 50 q-i 16...... 50 110 TOO 34 oon 624 164 45 16 32 44 17...... 108 282 180 98 30 820 148 53 15 28 36 18...... 88 255 180 27 31 780 356 87 14 25 30 19...... 76 232 180 25 30 760 348 120 78 41 22 28 20...... 69 204 180 22 30 700 352 102 69 93 20 30 21...... 65 157 180 1Q 29 640 367 106 76 87 18 28 22...... 72 148 185 1Q 28 580 808 137 84 77 18 24 23...... 70 145 190 18 28 580 511 185 82 66 25 21 - 84.-...... CO 150 1Qfl 1 Q OQ COA «V|O 64 52 28 20 25...... 55 152 170 21 28 470 918 126 62 44 28 18 26...... 60 160 22 27 560 948 91 0 49 40 25 16 27...... 80 258 150 27 26 1,150 242 175 50 35 21 15 28...... 118 450 140 32 24 640 611 130 75 30 18 18 29...... 125 462 1OC 17 25 450 831 102 85 24 18 18 30...... 114 550 138 390 641 102 133 22 22 41 31...... 207 148 37 310 91 19 21 NOTE. Stage-discharge relation affected by ice Dec. 23-25,1918, Jan. 4 to Feb. 23, 1919, and Dec 17, 1919, to Apr. if, 1920. Daily discharge for these periods based on gage heights corrected for effect of ice by means of discharge measurements, observer's notes, and weather records. * Monthly discharge of Smith River near Bristol, N. H.,for the years ending Sept. §0,1919 and 1920. [Drainage area, 78.5 square miles.] Discharge in second-feet. Month. Per Run-off Maximum. Minimum. Mean. square in inches. mile. 1918-19. 188 72 103 1.31 1.51 November ... j ...... 242 56 101 1.29 1.44 560 78 205 2.61 3.01 282 37 146 1.86 2.14 February. ... 4 ...... 100 20 49.4 .629 .66 March j 1,460 138 475 6.05 6.98 April...... J...... 780 125 277 3.53 3.94 May...... J...... 1,060 106 307 3.91 4.51 98 21 41.0 .522 .58 July...... 4...... 41 8 17.2 .219 .25 August...... J...... 28 5 11.5 .146 .17 September. .. J ...... 70 14 38.3 .488 .54 1,460 5 149 1.90 25.73 1919-20. 207 22 65.4 0.833 0.96 November...... 550 145 284 3.62 4.04 499 135 205 2.61 3.01 134 18 47.5 .605 .70 February. ... j ...... 35 24 30.4 .387 .42 1,150 20 373 4.75 5.48 April...... 1,300 242 547 6.97 7.78 MttTr 633 91 282 3.59 4.14 137 45 76.3 .972 1.08 July...... 93 14 38.9 .496 .57 44 18 24.6 .313 .36 52 15 26.4 .336 .37 The year.- ...... 1,300 14 167 2.13 28.91 84 SURFACE WATER SUPPLY, 1919l-1920, PART I. CONTOOCOOK RIVER HEAR ELMWOOD, N. H. LOCATION. At covered highway bridge on county road between Hancock and Green- field, Hillsboro County, half a mile below mouth of Kimball Brook and 1$ milea south of Elmwood railroad station. DRAINAGE AREV. 168 square miles (measured on topographic maps). RECORDS AVAILABLE. September 20, 1917, to September 30, 1920. GAGE. Chain on upstream side of bridge; read by Mrs. G. M. Elliott. DISCHARGE MEASUREMENTS. Made from bridge or by wading. CHANNEL AND CONTROL. Stream bed is covered with boulders and gravel; control at low stages is rock ledge about 50 feet below gage and is well defined; at high stages control is probably at a storage dam about 3 miles downstream. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 9.6 feet at 5.30 a. m. May 23 (discharge, by extension of rating curve, 2,800 second-feet); minimum stage recorded, 1.58 feet at 6 a. m. July 7'(discharge, 24 second-feet). Maximum open-water stage recorded for the year ending September 30, 1920, 9.2 feet at 6.30 p. m. March 29 (discharge, by extension of rating curve, 2,58fr second-feet), (a stage of 11.4 feet was recorded at 5.30 p. m. March 28, but the stage-discharge relation was affected by an ice jam); minimum stage recorded, 1.58 feet at 9 a. m. August 9 (discharge, 25 second-feet). 1917-1920: Maximum open-water stage recorded, 9.6 feet May 23, 1919 (dia* charge, by extension of rating curve, 2,800 second-feet). A stage of 11.4 feet was recorded March 28, 1920, but the stage-discharge relation was affected by an ice jam. Minimum stage recorded, 1.48 feet August 23, 1918 (discharge, 19 second- ; feet). : ICE. River is usually covered with ice'for several months during the winter. REGULATION. Considerable storage has been developed in Nubanusit Lake and other reservoirs on the main river and tributaries. Water power is used at various places on the river above the station; the first dam above the gage is at North Peterboro, 4 miles upstream. ACCURACY. Stage-discharge relation practically permanent, except when affected by ice. Rating curve well defined between 50 and 1,200 second-feet. Gage read twice daily to hundredths, except during winter, when it was read once daily. Daily discharge ascertained by applying rating table to mean daily gage height, with correction for effect of ice during winter. Records fair. Discharge measurements of Contoocook River near Elmwood, N. H., during the years ending Sept. 30, 1919 and WtO. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. 644 Jan. 15 "2.82 100 Feb. 19 «2.44 86 Mar. 20 H.S. Price...... 07.00 637 Mar. 20 5.30 862 May 7 3.92 401 2.28 92 7 3.95 414 July 9 .....do...... 2.44 116 Stage-discharge relation affected by ice. MEERIMACK EWER BASIN. 8:5 Daily discharge, in second-feet, of Contoocook River near Elmwood, N. H., for the years ending Sept.'''SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. I.... 1...... ,.. 172 " 104 134 560 145 300 574 220 192 80 74 54 2...... L.. 134 97 134 520 745 425 344 210 80 74 49 .8...... J.:. 111 68 118 560 160 640 369 321 230 74 33 134 4...... ;.. 111 73 97 600 200 605 369 220 240 54 49 290 5...... U- 104 111 104 560 170 574 344 574 210 49 54 6...... 104 90 104 310 185 640 300 544 174 26 74- 120 7...... ;.. 152 97 97 280 150 710 369 425 174 45 80 58 8;...... 126 on 97 9Ofi 125 7A5 369 396 113 63 80 68 9...... 111 84 126 290 135 940 369 321 160 74 68 120 10.;...... ;..' i ifti 54 1W1 1 Ififl SfiQ 240 Sfi 45 11...... j.. 104 58 118 190 140 1.140 321 454 220 80 134 12...... I.. 84 58 118 150 130 574 605 780 166 74 54 13...... ].. 78 78 1S2 180 105 514 484 820 166 41 74 120 14...... i.. 97 78 257 200 165 425 454 605 142 54 74 68 15...... !.. 143 68 498 200 155 369 321 454 86 74 80 80 16...... ]-... 84 68 950 190 105 369 321 369 127 86 63 93 17...... ;.. 84 172 730 180 155 369 900 369 134 93 33 93 18...... 4 ;. 84 627 408 180 120 425 780 820 127 86 49 80 19...... j.. 78 627 280 110 89 574 710 745 106 74 74 86 20...... 4.. 58 467 257 170 94 1,020 425 514 113 45 93 80 21...... j.. 84 257 224 180 100 980 396 425 120 68 80 58 22.:...... ^. 111 202 257 135 105 940 344 1,320 54 80 80 37 2ft ' 118 162 644 210 94 675 299 2,660 68 127 80 104 152 514 620 130 640 260 1,940 100 158 41 SB 2$ ^ 97 134 498 660 140 544 250 980 100 106 80 lw) 118 396 300 745 93 80 80 26...... J.. 84 467 150 160 '-74106 97 i 73 118 437 220 145 369 210 574 93 49 74 'SO 28...... 78 104 240 125 940 210 484 93 63 80 29...... 90 118 408 280 1,540 210 396 45 80 58 30...... 104 162 498 240 980 210 300 54 74 80 45 81...... 111 580 160 710 270 74 41 1919-20. 80 134 484 58 90 1,580 980 183 174 100 120 2...... 74 166 300 56 95 1,580 710 192 , 201 106 106 3...... 120 240 300 47 100 1,500 514 174 210 142 106 4...... 100 166 321 49 100 1,500 574 174 127 106 93 6...... 54 210 321 54 105 1,580 574 ' 174 100 106 SO 6...... 45 220 321 50 150 1,720 425 321 134 86- 68 7...... 86 192 230 47 200 1^180 396 321, 142 58 49 8...... 68 166 240 54 250 860 321 260 120 30 58 9...... 54 127 260 78 300 7JO 675 120 33 10...... SO 150 514 92 350 60S 574 201 106 58 63 11...... SO 104 484 62 400 544 . ,484 192 68 396 127 ts...... 58 150 484 60 500 544 425 220 106 300 106 12 45 183 369 52 800 940 396 166 100 . 210 166 1!:::::::::::::: 41 250 344 43 1,500 2,080 321 183 120 605 127 15...... 68 201 344 70 60 2,000 1,540 300 166 106 369 158 16...... 68 142 60 1,650 1,140 260 192 106 270 150 17...... 86 166 260 72 1,350 1,160 280 192 93 220 134 18...... 68 134 230 74 1,100 745 280 425 45 260 120 19...... 54 113 220 74 860 745 280 ' 514 74 260 ' 74 20...... 49 113 166 70 640 , 675 220 321 150 2C1 m 21...... §8 183 113 66 340 745 174 300 127 158 86 22...... 68 120 106 68 360 1,140 544 321 106 86 80 28...... 74 106 105 66 640 1,680 830 3W 113 127 86 24...... 74 80 «6 74 1,150 2,120 574 280 100 127 68 26...... 63 106 88 66 1,600 1,450 484 240 58 127 . 74 26...... 45 142 88 68 1,700 860 396 192 49 127 45 41 230 82 70 1,850 640 321 134 86 127 49 28...... 127 640 76 68 2,300 1,400 270 166 86 74 29...... 142 454 68 68 2,580 2,350 230 166 93 58 93 30...... 58 544 68 68 2,170 1,450 174 174 80 80 250 31...... 100 62 64 1 * 720 166 86 113 NOTE. Stage-discharge relation affected by ice Dec. 31,1918, to Mar. 1,1919, Dec. 16-17,1919, and Dec. 23,1919, to M^r. 28,1920; discharge for these periods determined from gage heights corrected for1 eflEeet of ice by means of discharge measurements, observer's notes, weather records, and comparison with measure ments at other stations- 86 SUBFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Contoocook River near Elmwood, N. H.,for the years ending Sept. SO, 1919 and 1920. [Drainage area, 168 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. \nnlniiiTn > Mean. square " mile. 1918-19,. 172 58 102 0.607 0.70 627 54 156 .929 1.04 950 97 317 1.89 2.18 660 110 293 1.74 a. 01 200 89 136 .810 .84 1,540 300 696 414 4.77 April...... 900 210 396 3.77"2.36 2.63 May...... 2,660 220 634 4.35 2*0 45 138 .821 .92 July...... 158 26 73.3 .436 .50 93 33 66.3 .395 .46 September...... 390 37 96.5 .574 ..64 T*liA Vflar 2,660 26 260 1. 55 . 21.04 1919-20. 142 41 72V.0 0.429 0.4$ 640 80 199 1.18 1.32 514 62 240 1.43 1.65 92 43 63.5 .378 .44 February...... 60.0 .357 .38 March...... 2,580 90 934 5.56 6.41 2.350 605 1,320 7.26 8.10 May...... 980 166 424 2.52 2.90 514 134 238 1.42 l.fiS July...... 210 45 109 .649 .75 605 30 166 .988 1.14 250 49 98.6 .587 .65 2,580 319 1.90 25.81 BLACKWATER RIVER HEAR CONTOOCOOK, N. H. LOCATION. At covered high-way bridge in Webster, 150 feet north of Webster-Hop- kinton town line, 1.1 miles from Tyler flag station of Boston & Maine Railroad, and 3J miles from Contoocook, Merrimack County. DRAINAGE AREA. 131 square miles IJmeasured on Walker maps). RECORDS AVAILABLE. May 16, 1918, to September 30, 1920. GAGE. Chain on downstream side of bridge. Vertical staff attacked to tree on west side of highway 150 feet north of bridge for use during flood stages. Gages read by H. F. Corliss and R. H. Kimball. DISCHARGE MEASUREMENTS. Made from bridge or by wading. CHANNEL AND CONTROL. Channel deep at and above gage; control is at site of old dam 100 feet below the gage; probably permanent. EXTREMES OP DISCHARGE. Maximum stage for'the period May 16,1918, to September 30, 1919, 14.5 feet on March 30, 1919; determined by leveling from high-water mark (discharge, from extension of rating curve, 2,620 second-feet) j minimum stage recorded, 1.90 feet at 6 p. m. August 4,1919 (discharge, 20 second-feet). Maximum stage recorded for the year ending September 30, 1920, 15 feet at 11 a. m. March 29 (discharge, from extension of rating curve, 2^730 second-feet); minimum etage recorded, 2.0 feet at 5 p. m. October 2, 1919 (discharge, 25 second-feet). MERRIMACK BIVER BASIN. 87 ICE. Kiver usually freezes over during the winter, but control remains partly open. REGULATION. A small amount of storage has been developed in Pleasant Pond (New London); several small mills above the gage, but distribution of flow not seriously affected. ACCURACY. Stage-discharge relation probably permanent. Rating curve well defined below 1,600 second-feet. Gage read twice daily to hundredths except during winter when it was read once daily. Daily discharge determined by applying rating table to mean daily gage height. Records good. Discharge measurements of Blackwater River near Contoocook, N. H., during the years ending Sept. 30, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by 3*. charge. 1918. Feet. Sec.-ft. 1919. Feet. Sec.-ft. Nov. 19 A. no 332 Aug. 14 2.14 33.6 1920. 1919. Tan 9O M.R. Stackpole...... 02.62 55 Feb. 18 M. R. Stackpole...... 2.80 100 May 12 .....do...... 4.41 426 Mar. 31 R.H.Suttie...... 9.45 1,510 July 10 K. K. Hoyt...... 2.60 78 Apr. 14 B. H. Suttie...... 4.88 528 M. R. Stackpole...... 2.89 115 a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Mlaclpmaier \River near Contoocook, N. H.,for the year* ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 290 201 192 121 934 210 230 53 44 40 2...... 230 201 201 192 633 250 201 58 32 41 3...... 192 164 164 260 461 300 192 58 25 44 4...... Iftt 139 147 43Q 4t 8 280 IRA 57 27 40 5...... 155 139 128 418 418 280 155 50 30 44 6...... 164 155 94 633 418 280 139 55 34 44 7...... 210 164 97 ^ 396 350 155 62 29 52 8...... 230 147 131 & 418 320 375 63 33 72 9...... 210 139 125 110 504 461 280 139 56 52 155 10...... 164 139 121 633 ifii 250 280 58 26 54 U...... 147 131 110 719 418 240 290 58 39 61 12...... 139 129 115 654 439 250 220 60 30 56 13...... 139 121 112 504 504 260 173 59 32 80 14...... 139 115 128 375 525 332 147 49 30 64 15...... 131 114 173 322 44& 290 131 43 34 79 16...... 131 109 300 235 270 353 201 123 60 33 57 17...... 120 108 OQft 260 41 S 220 S3 62 Daily discharge, in second-feet, of Blackwater River near Contoocook, N. JET.,/or $e years ending Sept. 30, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 38 106 482 58 46 54 1,410 1.300 156 115 x,fi 67 2...... 31 210 504 .64 45 58 1,320 934 156 100 67 65 3...... 38 260 547 54 44 58 .1,190 676 156 81 64 5» 4...... 35 311 504 54 64 54 1,110 590 139 74 63 59 5...... 41 311 504 54 64 58 1,210 547 147 78 63 56. 6...... 48 250 482 50 54 54 1.240 482 210 79 56 49 7...... 49 210 332 48 74 54 1:410 418 250 77 50 48 8...... 47 210 311 46 59 54 1,190 375 260 77 55 50- 9...... 42 220 240 43 66 54 805 439 220 75 46 54 10...... 46 210 220 35 62 54 568 547 173 70 48 58 11...... 48 192 340 39 60 64 525 547 156 74 66 1(K> 12...... 46 201 200 38 64 165 439 418 147 66 83 100 1O 44 396 200 39 74 380 439 353 110 71 109 210 14...... 37 633 165 36 64 547 1,410 311 75 72 210 201 1 "I 43 783 190 33 64 676 1,830 300 117 68 250 120> 16...... 33 590 155 32 60 934 1,630 300 108 65 201 12& 17...... 54 568 155 30 58 1,020 1,190 270 147 64 164 121 18...... ;.. 55 396 130 31 64 1.110 826 270 164 50 164 102 19...... 54 300 125 34 58 1,110 977 250 192 70 104 79 20...... 51 270 92 31 60 1,080 1,130 230 192 100 86 67 21...... 70 280 92 37 54 1,020 891 220 164 131 57 77 22...... 46 270 92 34 58 762 955 375 164 128 67 75 23...... 51 164 92 38 58 955 1,190 697 173 110 92 61 24...... 54 220 78 38 58 848 1,430 697 156 106 70 58 25...... 57 220 79 42 58 1,190 1,500 525 139 100 78 48 26...... 58 201 73 38 54 1,430 1,110 375 123 75 88 51 27...... 58 260 68 52 58 1,850 891 332 108 72 67 39 28...... 57 418 64 56 58 2,440 998 270 290 67 68 49 29...... 54 439 64 52 54 2.730 1,540 260 92 67 58 60 30...... 63 482 60 50 2,290 1,650 240 118 63 55 117 Of 78 56 44 1,850 173 52 70 NOTE. Discharge Jan. 1 to Feb. 17, Mar. 22-25, and May 7-12,1919, estimated by hydrograph comparison with Smith and Contoocook rivers. Stage-discharge relation affected by ice Dec. 10,1919, to Mar. 13,1920; discharge for this period based on gage heights corrected for eflect of ice by means of one discharge measure ment, observer's notes, weather records, and comparison with measurements at other stations. Braced figures show mean discharge for period included. Monthly discharge of Blackwater River near Contoocook, N. E., for the years ending Sept. 80, 1919 and 1920. "' i [Drainage area, 131 square miles.] Discharge in second-feet. Month. ^ ft Per Run-off Maximum. Minimum. Mean. square in Inches. mile. 1918-19. 290 105 150 1.15 1.33 396 108 178 1.36 1.52 783 94 256 1.95 2.25 235 1.79 2.06 103 .786 .82 2,290 121 674 5.15 5.94 April...... 934 220 421 3.21 3.58 May...... 2,250 210 553 4.22 4.87 375 68 145 1.11 1.24 July...... 66 34 52.7 .402 .46 59 25 39.3 .299 .35 192 33 60,8 .464 .52 2/290 25 241 1.84 24.94 , 1919-20. 78 31 49.2 0.376 0.43 783 106 319 2.44 272 547 56 216 1.65 1.90 64 30 42.9 .327 .38 February.:...... ,.,...... ;..... 74 44 59.1 .451 .49 March. ...l...... J. iT^...... ;...... 2,730 54 806 6.15 7.09 April...... ;...... 1,830 439 1,130 8.63 9.63 May...... 1 300 173 443 ' 3.38 3.90 290 75 160 1.22 1.36 July...... 131 50 80.5 .615 .71 250 46 89.5 .683 .79 210 39 80.5 .615 .69 The year...... 2,730 30 290 2.21 30.09 MEREIMACK BIVEE BASIN. SUNCOOK RIVEE AT NORTH CHICHESTER, IT. H. LOCATION. About 100 feet below highway bridge and 500 feet from Chichester Depot, North Chichester, Merrimack County, 2J miles above mouth of Little Suncook River. DRAINAGE AREA. 157 square miles (measured on topographic maps). RECORDS AVAILABLE. -May 21,1918, to September 30,1920. GAGE. Vertical staff and Sanborn recorder attached to tree on left bank. Gage read and recorder inspected by M. H. Gamage. DISCHARGE MEASUREMENTS. Made from bridge or by wading. CHANNEL AND CONTROL. Stream bed covered with gravel and alluvial deposits; low-water control at head of rapids about 150 feet below gage; at high water the control is probably formed by crest of an old dam near Epsom. EXTREMES OP DISCHARGE. Maximum open-water stage for the year ending Sep tember 30,1919, 7.9 feet on March 29 (discharge, by extension of rating curve, 1,530 second-feet); (a stage of 8.5 feet occurred at 6 p. m. Jan. 24, but stage- discharge relation was affected by ice); minimum, stage from water-stage recorder, 1.1 feet several times in August (discharge, by extension of rating curve, 9 second- feet). Maximum stage for the year ending September 30, 1920, about 9.1 feet on March 27-28 (discharge, by extension of rating curve, 1,840 second-feet); mini mum stage from water-stage recorder, 1.1 feet August 8 and 9 (discharge, 9 second- feet); (discharge of 9 second-feet also occurred several times in February, etage- discharge relation affected by ice). 1918-1920: Maximum stage, about 9.1 feet on March 27-28,1920 (discharge, by extension of rating curve, 1,840 second-feet); minimum stage 1.1 feet several times during August, 1919, and August, 1920 (discharge, 9 second-feet); (discharge of 9 second-feet also occurred in February, 1920, stage-discharge relation affected by ice). ICE. River is covered with ice for several months during the winter. REGULATION .^Storage has been developed at several points above Pittsfield. The operation of mills at Pittsfield causes a large variation in discharge during days when the mills are in operation. ACCURACY. Stage-discharge relation probably permanent except when affected by ice. Rating curve well defined between 15 and 800 second-feet. Operation of water-stage recorder unsatisfactory during a considerable part of the time. Staff gage read twice daily to half-tenths and used for comparison with water-stage recorder. Daily discharge ascertained by applying rating table to mean daily gage height from water-stage recorder, with correction for effect of ice during the winter. Records fair. Discharge measurements of Suncook River at .North Chichester, N. H., during the year» ending Sept. 30,1919 and 1920. Dis Dis Date. Made by liGignt. charge., Date. Made by height. charge* 1918. Feet. Sec-it. 1919. Feet. Sec.-ft. ' Noy. 20 4.63 712 June 19 M.-R. Stackpole...... 2.60 220 20 ..:..do...... 4.41 669 Aug. 15 B. L. Bigwood...... 1.25 16.0 1919. 1920. Jan. 27 .....do...... ofi.12 742 o 2. 50 21.7 Feb. 17 M.R. Stackpole...... 04.47 325 May 13 3.37 429 Mar. 18 R.H.Suttie...... 3.35 409 o Stage-discharge relation affected by ice. 90 SURFACE WATER SUPPLY, 191&-1920, PART I. Daily discharge, in second-feet, ofSuncook River at North Chichester, N. H.,for the years ending Sept. SO, 1919 and 19%0. Day. Oct. Nov. Dec, Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 189 103 236 368 250 84 710 215 274 87 98 14 2...... 170 117 wu. 392 240 380 610 392 255 98 69 14 3...... 164 136 182 440 260 540 512 416 206 103 14 32 4...... 162 184 182 416 270 520 440 320 168 21 103 30 5...... 136 114 121 392 250 620 452 368 154 19 89 31 6...... 209 99 150 270 200 ' 960 464 368 140 14 85 31 7...... 368 94 99 220 190 820 416 308 78 74 85 15 8...... 272 105 107 300 94 450 404 320 103 89 87 30 9...... 206 85 148 270 170 480 380 284 144 94 56 42 10...... 178 130 96 260 170 760 320 226 123 99 14 36 11...... 148 123 85 190 52 680 368 274 134 103 46 44 12...... 152 140 105 170 130 520 560 344 125 60 49 56 13...... 164 92 105 170 160 660 536 356 99 19 47 50 14...... 246 101 125 150 110 500 464 308 61 94 39 27 15...... 222 99 610 160 130 404 476 270 61 112 76 89 16...... 170 79 898 190 48 368 368 222 134 112 41 72 17...... 156 42 660 190 120 356 748 202 99 101 13 40 18...... 121 440 476 120 105 416 635 464 101 108 30 34 19...... 119 835 380 160 64 848 428 428 101 57 34 38 20...... 117 710 318 170 94 1,100 380 356 89 17 35 30 21...... 125 488 262 110 70 1,250 380 296 50 87 15 12 22...... 172 404 253 94 58 1,270 308 598 14 108 35 42 23...... 140 368 685 78 36 1.100 284 1,280 70 125 30 45 24...... 127 320 785 400 260 1,040 296 1,150 83 123 18 45 25...... 129 272 1,060 800 130 835 320 972 85 121 60 43 26... :...... 78 234 935 760 190 685 274 1,050 107 66 47 45 27...... 130 180 648 720 190 622 320 772 110 23 33 36 28...... 121 156 512 540 240 822 296 572 69 90 16 13 29.....:...... 140 243 440 440 1,530 248 464 24 79 28 40 30...... 164 306 392 340 1,180 234 368 121 82 12 43 31...... 134 416 310 898 315 87 13 1919-20. 1...... 40 85 440 47 17 86 1,160 1,010 272 112 12 146 2...... 38 103 368 100 52 52 1,040 685 272 127. 32 136 3...... 46 195 298 160 86 18 1,180 622 148 89 74 92 4...... 42 150 428 41 94 52 1,160 512 134 101 61 87 5...... 28 123 380 96 86 180 1,140 452 53 134 121 23 6...... 42 224 320 140 120 250 1,410 416 234 200 158 23 7...... 46 296 312 120 120 460 1,140 392 250 89 13 132 8...... 47 238 262 120 36 490 835 344 204 94 10 129 9...... 43 184 279 86 64 620 835 635 193 56 37 123 10...... 52 180 356 60 110 660 610 660 182 99 60 132 11...... 37 96 622 17 110 660 560 524 105 68 84 114 12...... 16 166 622 120 105 580 597 428 55 38 65 204 13...... 14 236 416 86 105 940 760 356 79 70 62 416 14...... 40 440 332 120 94 1,600 1,180 298 136 79 54 910 15...... 32 308 404 120 9 1,500 1,010 282 114 57 404 548 16...... 35 206 310 130 160 1,450 860 258 117 46 238 428 17...... 42 202 220 94 130 1,450 785 258 117 33 182 392 18...... 22 186 250 10 105 1,500 735 243 162 66 404 320 19...... 11 168 190 58 130 1,400 660 211 198 70 332 298 20...... 28 148 140 150 105 1,300 622 234 182 116 182 220 21...... 26 136 135 130 70 1,250 597 198 204 58 37 193 22...... 33 66 190 105 18 1,260 960 464 220 96 62 168 23...... 36 160 150 110 41 1,240 1,160 685 211 78 176 142 24...... 32 191 140 310 105 1 310 1,390 536 198 89 96 148 25...... 23 213 56 21 70 1,560 1,110 452 98 131 18 105 26...... 14 158 125 30 78 1,560 885 380 44 94 123 123 27...... 36 475 170 120 78 1,810 R4.1 274 65 46 92 148 28...... 53 440 28 130 28 1,810 1,010 193 105 53 105 148 29...... 43 320 105 110 9 1,560 1,560 220 289 45 12 132 30...... 37 416 150 110 1,480 1,210 220 184 34 96 810 SI...... 53 160 70 1,310 215 37 110 NOTE. Stage-discharge relation affected by ice from Jan.6 to Mar. 14,1919, and Dec. 16,1919, to Mar. 13, 1920; discharge for these periods based on gage heights corrected for effect of ice by means (" " - - - - urements, observer's notes, weather records, and comparative hydrographs. MERRIMACK EIVEE BASIN. 91 Monthly discharge of Suneook River at JVorfA Chichester, N. H., for the yean ending Sept. SO, 1919 and 1920. [Drainage area, 157 square miles.] Discharge in second-feet. Month. Per Run-off M&ximum. Minimum. Mean. square in inches. mile. 1918-19. 368 78 165 1.05 1.21 835 42 227 1.45 1.62 December...... 1,060 99 378 2.41 2.78 800 78 309 1.97 2.27 270 36 152 .968 1.01 1)630 84 732 4.66 5.37 748 234 421 2.68 2.99 May...... 1,280 202 461 2.94 3.39 June...... 274 14 113 .720 .80 July...... 125 14 78.7 .508 .59 103 12 45.9 .292 .34 September...... 89 12 37.3 v .238 .26 The year...... 1,530 12 262 1.67 22.63 1919-20. October...... 53 11 35.1 .224 .26 November...... 475 66 217 1.38 1.54 622 28 270 1.72 1.98 310 10 101 .643 .74 160 9 80.4 .513 .55 1,810 18 1,010 6.43 7.44 1,560 560 960 6.12 6.83 May...... 1,010 193 405 2.58 2.97 289 " 44 161 1.03 1.15 July...... 200 33 80.7 .514 .59 404 10 113 .720 .83 September...... 910 23 233 1.48 1.65 1,810 9 306 -> 1.95 26.53 SOUHEGAN RIVER AT MEREIMACE, HT. H. LOCATION. At head of Atherton Falls, at Merrimack, Hillsboro County, 7 miles below mouth of Beaver Brook and 1J miles above confluence of Souhegan and Merrimack rivers. DRAINAGE AREA. 168 square miles. RECORDS AVAILABLE. July 13,1909, to September 30,1920. GAGE. Gurley water-stage recorder on left bank about 350 feet above the falls used since October 15,1913. Inspected by employee of W. H. McElwain Go. DISCHARGE MEASUREMENTS. Made by wading below the falls at low stages or from * cable at high stages. CHANNEL AND CONTROL. The channel opposite the gage is a pool in which velocity is very low. The control is a rock ledge at the head of Atherton Falls and is permanent. ICE. Ice forms on control for short periods during some winters; probably no effect from ice during the winters 1918-19 and 1919-20. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder for the year ending September 30,1919, 7.43 feet at 6 a. m. March 29 (discharge, by extension of rating curve, 2,990 second-feet); minimum stage from water-stage recorder, 2.01 feet at 10 p. m. August 9 (discharge, 24 second-feet). Maximum stage for the year ending September- 30, 1920, from water-stage recorder, 8.04 feet at 5 a. m. March 28 (discharge by extension of rating curve, 3,530 second-feet); minimum stage from water-stage recorder, 2.02 feet from 2 to 6 p. m. September 6 (discharge, 24 second-feet). 1909-1920: Maximum stage recorded, 9.6 feet on August 5, 1915 (discharge, by extension of rating curve, 4,930 second-feet); Ttvinirrnim stage recorded, 1.90 feet at 8 a. m. September 8, 1909 (discharge, 15 second-feet). REGULATION. Flow affected by the operation of the mills at Milford, about 8 miles above. ACCURACY. Stage-discharge relati Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. i.. '...... 170 64 130 219 225 260 748 236 219 70 41 32" 2...... 120 66 130 190 190 880 638 351 210 64 40 34 3...... 110 54 130 665 205 730 550 474 201 58 33 60 4...... 100 48 128 429 215 620 545 347 175 43 30 219 5...... 100 70 104 323 200 850 545 535 160 34 34 162 6...... 102 64 '10668 290 180 1,280 540 638 140 46 32 116- 7...... 91 80 270 176 800 550 424 132 37 30 64 8...... 80 70 96 300 160 530 501 363 114 .44 26 54 g 69 70 122 9 NOTE. Discharge Oct. 1-5, Nov. 22 to Dec. 2, Dec. 21-23, and Dec. 30-31,1918; Jan. 6-9, Jan. 13, Jan. 17-27,. May 10-14, and Dec. 18-29, 1919; Jan. 26 to Feb. 2, and Apr. 29 to May 12, M$Q, estimated by aydrograph comparison with Pemigewasset and Contoocook rivers. MERRIMACK RIVER BASIIST. Monthly discharge of Souhegan River at Merrimaek, N. H., for the years ending Sept. SO, 1919 end 1920. [Drainage area, 168 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 170 86.0 0.512 0.59 November...... 550 129 .768 .86 December...... 720 263 1.55 1.79 January...... 665 291 1.73 1.99 February...... 225 145 .863 .90 Ttfarch...... 2.490 869 5.17 5.96 April...... 1,230 504 3.00 3.35 1,960 552 3.28 3.78 June...... 219 122 .726 ..SI July...... 142 52.3 .311 .36 August...... 43 32.6 .194 .22 September...... 219 78.1 .465 ..52 The year...... 2. 24 262 1.! 21.13 1919-20. October...... 28 46.9 .279 .32 November...... 1,230 100 344 2.05 2.29 December...... 1,010 104 326 1.94 2.24 January...... 104 74 87.2 .519 .60 February...... 116 84 100 .596 .64 March...... 2.970 94 1,210 7.20 8.30 April...... 1.960 545 1,140 6.79 7.68 May...... 1,440 225 512 3.05 3.52 June...... 692 118 271 1.61 1.80 July...... 118 44 80.4 .479 .,55 August...... 198 27 70.9 422 ,49 ~' ' 110 25 56.1 .334 .37 The year...... 2,970 25 354 2.11 28.70 SOUTH BRANCH OF NASHUA RIVER BASIN (WACHUSETT DRAINAGE BASIN) NEAR CLINTON, WORCESTER COUNTY, MASS. LOCATION. At Wachusett dam, near Clinton. DRAINAGE AREA. 119 square miles, 1896 to 1907; 118.19 square miles, 1908-1913; 108.84 square miles, 1914-1920. RECORDS AVAILABLE. July, 1896, to September, 1920. REGULATION. Flow affected by storage in Wachusett reservoir and other ponds. Beginning with 1897 the determinations of discharge have been corrected for gain or loss in the reservoir and ponds so that the record shows approximately the natural flow of the stream. The yield per square mile is the yield of the drainage area including the water surfaces. For the years 189Y to 1902, inclusive, the water surface amounted to 2.2 per cent of the total area; 1903, 2.4 per cent; 1904, 3.6 per cent; 1905, 4.1 per cent; 1906, 5.1 per cent; 1907, 6.0 per cent; 1908 and subsequent years, 7.0 per cent. COOPERATION* Record furnished by the Metropolitan Water and Sewerage Board of Boston; rearranged in climatic-year form by Uniiied States Geological Survey. SURFACE WATER SUPPLY, 1919-1920, PART I. Yield and rainfall in South Branch of Nashua River Joam (Wackusett near Clinton, Mass., for years ending Sept. SO, 1919 and 1920. [Drainage area, 108.84 square miles.] Yield per square mile. Run-oft. Total Month. yield Depth on Rainfall (million Million Second- drainage Per cent finches). gallons.) gallons feet. area in of per day. inches. rainfall. 1918-19. October ...... 1,152.3 0.341 0.528 0.609 38.6 1.58 November ...... 1,899.6 .582 .900 1.004 32.6 3.08 3,563.9 1.056 1.634 1.884 50.4 3.74 4,524.4 1.341 2.075 2.392. 74.1 3.23 2,419.1 .794 1.228 1.279 36.5 3.51 March ...... 10,632.1 3.155 4.882 5.621 106.7 5.27 April...... 5,558.2 1.711 2.648 2.954 115.0 2.57 May...... 7,435.7 2.204 3.410 3.931 64.9 6.06 1 509.0 .462 .715 .798 39.6 2.01 July...... 1,349.2 .400 .619 .713 14.3 5.00 884.1 .262 .405 .467 11.2 4.17 September...... 3,568.3 1.093 1.691 1.887 27.8 6.78 The year...... 44,495.9 1.120 1.733 23.539 50.1 47.00 1919-20. 1/671. 4 .495 .765 .884 37.6 2.35 5,992.9 1.835 2.840 3.168 52.7 6.01 December...... 4,360.0 1.292 1.999 2.305 110.4 2.09 January 2, 180. 0 .646 1.000 1.153 36.4 3.17 2,288.0 .725 1.122 1.210 19.3 6.26 15.805.6 4.685 7.248 8.356 196.0 4.26 11,407.0 3.498 5.413 6.031 98.4 6,13 May...... 6,988.4 2.071 3.205 3.695 92.1 4.01 6,275.1 1.922 2.974 3.317 54.6 6.07 July...... 2,729.2 .809 1.252 1.443 33.3 4.33 1,104.0 .327 .506 .584 20.1 2.91 September ...... 1,762.0 .540 .835 .931 14.6 6.39 62,563.6 1.571 2.434 33.077 61.3 53.98 SUDBTJB.Y RIVER AND LAKE COCHITTTATE BASINS HEAR FRAMINGHAM AND COCHITUATE, MIDDLESEX COUNTY, MASS. DRAINAGE AREA. Area of Sudbury basin from 1875 to 1878, inclusive, was 77.8 square miles; 1879-80, 78.2 square miles; 1881-1920, 75.2 square miles. Area of Cochituate basin from 1863 to 1909, inclusive, was 18.87 square miles; 1910, 17.8 square miles; 1911-1920, 17.58 square miles. RECORDS AVAILABLE. Of Sudbury River, January, 1875, to September, 1920; of Lake Cochituate, January, 1863, to September, 1920. Sudbury River and Lake Cochituate have been studied by the engineers of the city of Boston, the State Board of Health of Massachusetts, and the Metropolitan Water and Sewerage Board; records of rainfall have been kept in the Sudbury basin since 1875 and in the Cochituate basin since 1852, but the latter are considered of doubtful accuracy previous to 1872. ,, REGULATION. The greater part of the flow from these basins is controlled by storage reservoirs constructed by the city of Boston and the Metropolitan Water and Sewer age Board. Lake Cochituate, which drains into Sudbury River a short distance below Framingham, is controlled as a storage reservoir by the Metropolitan waterworks. In the Sudbury River basin the water surfaces exposed to evapora tion have been increased from time to time by the construction of additional storage reservoirs. From 1875 to 1878, inclusive, the water surface amounted to 1.9 per cent of the total area; from 1879 to 1884, to 3 per cent; 1885 to 1893, to 3.4 per cent; 1894 to 1897, to 3.9 per cent; 1898 and subsequent years, 6.5 per cent. MEEEIMACK BIVER BASIN. DETERMINATION OF DISCHARGE. In determining the run-off of the Sudbury and Cochituate drainage areas the water diverted for the municipal supply of Pram- ingham, Natick, and Westboro, which discharge their sewerage outside the basins, is taken into consideration; the results, however, are probably less accurate since the sewerage diversion works were constructed. Water from the Wachusett drainage area also passes into the reservoirs in the Sudbury basin and must be measured to determine the yield of the Sudbury basin; the small errors unavoidable in the measurement of large quantities of water decrease the accuracy of the determination of the Sudbury water supply during months of low yield for years subsequent to 1897. COOPEEATION. Record furnished by the Metropolitan Water and Sewerage Board of Boston; rearranged in clitaatic-year form by United States Geological Survey. Yield and rainfall in Sudbury jRiver basin near Fraininyham, Mass., for ike years ending Sept. 30, 1919 and 1920. [Drainage area, 75,2 square miles.] Yield per square mile. Run-off. Totalyield Month. (million Depth on Rainfall gallons). Million Second- drainage Per cent of (inches). gallons feet. area in rainfall. per day. inches. 1918-19. 640.2 0.274 0.424 0.490 47.0 1.04 1.102.2 .489 .756 .843 30.7 2.75 2,186.4 .938 1.451 1.673 45.5 3.68 January 3,044.3 1.306 2.021 2.329 66.1 3.52 1,930.2 .917 1.418 1.477 43.4 3.40 March...... 6,424.2 2.759 4.270 4.916 102.7 4.79 April...... 3,864.9 1.713 2.651 2.957 101.0 2.93 May...... 3007.0 1.290 1.996 2.301 50.0 4.60 253.3 .112 .174 .193 10.4 1.86 July...... 697.0 .299 .463 .533 9.8 5.47 215.2 .092 .143 .164 4.4 3.75 1,607.9 .713 1.103 1.232 23.3 5.28 24,972.8 .910 1.408 19.108 44.4 43.07 1919-20. 650.8 .279 .431 .498 23.1 2.16 2,877.5 1.275 1.973 2.202 37.3 5.90 2,551.6 1.095 1.694 1.952 98.6 1.98 January . 727.0 .312 .483 .556 - 17.1 3.26 1,619.5 .743 1.149 1.239 19.1 6.49 March...... 12,103.6 5.1'92 8.033 9.262 207.9 4.45 April...... 6,557.2 2.911 4.503 5.017 96.6 &19 May...... 4,302.5 1.846 2.856 3.292 95.6 3.45 3,827.2 1.696 2.625 2.929 43.9 6.67 July...... 661.5 .284 .439 .506 24.9 2.04 -91.9 -.039 -.061 -.070 -4.0 1.78 143.8 .064 .099 .110 3.1 3.53 35,930.3 1.305 2.023 27.493 58.6 46.90 SURFACE WATER SUPPLY , PART I. Yield and rainfall in Lake Coehititate basin near Coehituate, Mass., for years ending Sept. 30, 1919 and 1920. [Drainage area, 17.58 square miles.] Yield per square mile. Run-off. Totalyield Month. (mflfion Depth on Rainfall gallons). Million Secend- drainage Percent of (inches). gallons feet. area in rainfall. par day. inches. 1918-19. 180.8 a 331 0,513 a 59 64,3 0.92 297.0 .563 .871 .97 37.8 2.57 December...... __ .... 571.9 1.049 1.624, 1.87 52.7 3.55 January 738.6 1.355 2.097 2.42 67.9 3.56 533.2 1.083 1.676 1.75 51.6 3.38 March. 1.265.8 2.326 3.589 4.14 87.8 4.72 April...... 781.7 1.482 2.56 95.5 2.68 May...... 750.4 1.377 2. Ho 2.46 51.0 4.82 140.8 .267 .413 .46 24.3 1.90 July...... 176.9 .325 .'502 .58 11.5 4.94 125.7 .231 .357 .41 10.4 3.95 September...... 548.3 1.040 1.609 1.79 30.2 5.94 The year...... 6, 111. 1 .952 1.473 20.00 46.6 42.93 1919-20. 241.0 0.442 0.683 0.79 36.0 2.19 841.2 1.595 2.468 2.75 45.6 6.04 December.....!...... 633.5 1.162 1.799 2.07 106.3 1.95 237.6 .436 .675 .78 . 23.9 3.25 666.1 1.307 2.022 2.18 31.1 7.01 March.. _ ...... 2,988.1 5.483 8.483 9.78 228.6 4.28 April...... 1,507.1 2.862 4.428 4.93 87.9 5.61 May...... 930.1 1.707 2.641 3.05 102.8 2.96 987.4 1.872 2.897' 3.23 41.8 7.'73 July...... 238.5 .438 .677 .77- 33.9 1.81 83.8 .154 .238 .28 17,4 1.58 99.9 .189 .293 .33 8.4 3.88 9,454.3 1.469 2.277 30.94 64.0 48.29 TAUNTOtf BIVEB BASIN. TATTNTON RIVER AT TITICTTT, NEAR BRIDGEWATER, MASS. LOCATION. At Summer Street Bridge, on road between Bridgewater and Middleboro, Plymouth County* half a mile from Titicut railroad station and 1 mile above confluence of Namasket and Taunton rivers. BEAINAGE AEEA. 185 square miles. ^ RECORDS AVAILABLE. March 2 to September 30, 1920. GAGE. Chain on upstream side of highway bridge; read by Emily Pratt. DISCHAEGE MEASUREMENTS. Made from upstream side of bridge. CHANNEL AND CONTROL. Channel deep, with hard bottom covered with rocks and gravel; apparently permanent. River overflows banks at high stages. EXTREMES OF DISCHAEGE. Maximum stage recorded during the period March 2 to September 30, 15.5 feet on March 19 as determined from high-water marks (dis charge, from extension of rating curve, 5,150 second-feet); minimum stage recorded 1.30 feet at 8.38 a. m. September 7 (discharge, from extension of rating curve, 59 second-feet). ICE. River freezes over and stage-discharge relation is affected by ice during winter. REGULATION. The nearest dam above the gage is at Paper Mill village, near Bridge- water, where water power is used by a paper mill. The operation of this mill does not materially affect the distribution of flow at the gage. ACCURACY. Stage-discharge relation apparently permanent except when affected by ice. Rating curve well defined between 200 and 2,400 second-feet, and fairly well defined between 75 and 200 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying rating table to mean daily gage height. Records good. TAUISTON RIVER BASIN. Discharge measurements of Taunton River at Tttieut, near Sridgewater, Mass., during the year ending Sept. S0t Dte- Gage JM». Date. Made by £EL charge. Date. Mad* by- height. charge. Feet. See.-ft. feet. Secjt. Mar. 5 H.S. Price.:...... oS.29 271 July 9 Piffle* *nd Tjamfnr . . . . 4.W 28* 23 11.42 2,080 12 4.75 243 26 10.10 1.680 Sept. 23 ...do...... 2,57 75 Apr. 6 M. R. Stackpole...... 7.50 960 23 ...do...... 2.64 100 20 H.S. Price...... 5.76 476 a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Taunton River, at Titicut, near Bridgewoter, Mass., for the year ending Sept. 80, 1920. Day. Mar. Apr, May. June. July. Aug. Sept. 1...... 270 1,160 900 385 360 164 80 2...... 270 1.020 76fl 410 315 182 74 3...... 250 990 620 360 2% 188 71 4...... 250 1 020 600 335 176 120 74 5...... 250 930 620 570 182 130 77 «...... 540 960 570 1.240 205 125 63 7...... 880 930 510 1,440 220 111 62 8.'...... 990 900 460 1,270 255 158 80 9...... 960 820 620 990 255 220 83 10...... ;...... 900 710 680 790 235 188 77 11...... 900 600 600 600 255 170 74 12...... 960 460 600 485 255 152 77 13...... 1,520 680 600 460 195 120 86 14...... 2,970 650 540 435 188 170 80 15...... 3,450 680 620 410 146 205 107 16...... 3,900 650 650 485 130 275 125 17...... 4,000 710 485 600 158 235 120 18...... 4,200 710 385 960 195 170 125 19...... 4.500 620 385 1,300 295 125 120 20...... 3,150 485 315 1^320 275 99 135 21...... 2,500 485 435 1,180 195 103 Q& 22...... 2,260 650 760 1,040 158 111 89 23...... 2,070 740 1,180 990 152 95 99 24...... 1,860 680 1,240 820 125 86 115 25...... 1,690 710 1,160 650 146 86 86 26...... 1,690 760 990 570 182 83 83 27...... 1,630 540 820 540 164 77 68 28...... 1,550 760 650 43fr 120 8» 83 29...... 1,440 990 570 410 130 71 88 30 ...... 1,350 1,020 485 385 135 65 77 31...... 1,350 410 130 86 NOTE. Gage inaccessible on account of high water Mar. 15-20; discharge for this period estimated from high-water marks and extension of rating curve. Stage-discharge relation affected by ice Mar. 1-13; dis charge for this period estimated from gage heights, on* dtecha«»B«ieBsureinent,and weather records, Monthly discharge of Taunton River at Titicut, near Bridgewater, Mass., for the year ending Sept. 30, 1920. / [Drainage area, 185 square miles.] Discharge in second-feet. Run-off Month. Per in indies. Maximum. Minimum. Mean. square mile. March...... 4,500 250 1,760 9.51 io.fl« April...... 1,160 458 wr 4.1» i.63 May...... 1,24O 3M 653 3.8* 4,« 1,440 335 729 3.94 4.40 July...... 360 120 201 1.09 1.26 275 65 137 .741 .8* 135 62 89.0 .481 .M 102721 23 WSP 501- SURFACE WATER SUPPLY, 191&-1920, PART I. PAWTUXBT RIVER BASIN. PAWTUXET RIVER AT FISKEVILLE, R I. , LOCATION. At an unused milldam in Fiskeville, Providence county. DRAINAGE AREA. 101.8 square miles.6 RECORDS AVAILABLE. January 1, 1916, to September 30, 1920. DETERMINATION OP DISCHARGE. Discharge determined from records of stage obtained by Gurley water-stage recorder. The dam, which is about 140 feet long, has been rated by laboratory tests on a full size model and by current-meter measurements made at bridge a short distance upstream. Rating curve well defined below 1,400 second-feet. REGULATION. Previous to April, 1919, there were four reservoirs in the basin with a capacity of 385 million cubic feet; since April, 1919, there have been five reser voirs with a total capacity of 441 million cubic feet. Monthly discharge has been corrected for gain or loss in amount of water held in storage. A few small mill ponds near Fiskeville hold back water Saturday afternoons and Sundays, when the stage of the river is low. DIVERSIONS. The Pawtuxet Valley Water Co. diverts part of the flow from 1.3 square miles just above Fiskeville, correction for which has been made. COOPERATION. Data collected and compiled under the direction of Frank E. Winsor, chief engineer, city of Providence Water Supply Board. - . Daily discharge, in second-feet, of Pawtuxet River at Fiskeville, R. I., for the years ending Sept. 30, 1916-1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1915-16. 1...... 356 205 453 690 426 300 144 244 130 2...... 232 201 367 833 353 258 89 204 78 3...... 241 201 342 733 299 168 161 197 37 4...... 254 195 328 543 290 185 123 191 30 6...... 280 185 241 448 278 258 182 171 129 6...... 310 116 256 382 271 251 171 124 72 7...... 292 168 294 343 214 237 152 158 103 8...... 228 198 293 311 212 224 109 130 105 9...... 163 197 300 299 255 255 91 163 70 10...... 177 190 352 399 211 268 139 149 24 11...... 287 181 354 436 229 201 145 142 98 12...... 272 180 265 430 213 303 167 153 74 13...... 254 112 313 376 200 302 195 119 86 14...... 252 146 347 391 137 272 219 155 70 15...... 202 187 364 512 197 227 184 140 112 16...... 165 158 338 400 263 210 114 137 75 17...... 175 151 340 396 748 463 153 141 24 18...... 188 151 359 364 1,000 1,100 153 146 110 19...... k 207 154 222 324 671 829 161 118 116 20...... 214 117 204 291 448 542 163 75 84 21...... 187 170 239 295 310 401 267 137 76 22...... 197 166 255 297 319 339 301 126 94 23...... 208 166 309 305 281 286 280 133 65 24...... 216 139 256 364 286 246 464 129 13 25...... 185 334 248 348 286 185 469 128 80 26.',..,..,..:... 202 1,710 ; 238 338 238 237 382 92 84 27...... '....., 204 1.690 404 300 212 241 397 55 74 28...... 1,010 559 423 174 225 650 139 69 29...... 216 661 648 569 177 208 503 133 87 30...... 152 622 450 257 180 340 135 60 31...... 182 709 313 321 131 v- «Includes a water area of 2.5 square miles and a swamp area of 2 square miles. Previous to filling one of the existing reservoirs in April, 1919, the water area was 2.1 square miles. PAWTUXET EIVEB BASIN. Daily discharge, in second-feet, of Pawtuxet River at Fiskeville, R. I., for the years ending Sept. SO, WIG-1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1916-17. 1...... 46 95 86 110 152 163 322 183 202 81 68 128 2...... 80 77 76 127 144 142 387 222 200 118 70 3...... 73 77 40 94 113 113 340 219 180 110 112 AC 4...... 75 54 105 76 103 80 292 204 225 59 61 105 5...... 65 31 95 102 142 106 267 320 189 115 00 114 6...... 64 93 71 329 144 qofi 510 182 197 104 7...... 65 103 68 221 114 143 529 536 162 100 88 QA 63 63 59 192 95 400 qoo 161 57 77 64 g 77 71 48 165 106 256 374 300 127 107 QA 44 10...... 61 64 11 169 96 267 275 132 111 144 102 11...... 60 46 83 163 56 352 238 181 107 120 01 12...... 79 15 68 131 81 236 376 223 323 120 60 as 13...... S3 60 82 114 59 275 337 iftfi 314 118 11R 94 14...... 63 68 105 204 55 977 afift oto 94Q so 108 so 15...... 32 54 93 304 66 266 237 Of q 219 90 91 55 16...... 72 52 50 255 59 9(U 255 101 210 142 70 15 17...... 82 53 18 207 41 0,10 236 107 261 125 OR O7 18...... 71 39 88 174 22 447 248 205 429 125 81 19 79 27 68 158 70 345 222 173 336 116 43 126 . 20...... 146 61 78 140 74 290 215 118 248 111 96 1AO ' 21...... 116 52 81 94 85 256 224 144 ifii 65 07 109 22...... 60 45 93 131 78 266 181 163 174 44 93 62 OQ 120 35 96 149 56 274 204 17ft 147 OS 130 34 24...... 106 84 93 134 129 422 241 168 96 103 110 114 25...... 78 48 92 145 112 655 199 166 14T) 62 76 OS toe tAK 26...... 78 13 124 144 159 COn 1W 119 Kfl 110 27...... 90 68 117 122 369 400 212 107 1d,<» 99 107 105 28...... 65 77 102 65 266 935 194 173 155 57 103 107 2g 32 64 119 107 891 1WI 302 137 35 04 on 30 93 11 76 131 JSQfl 163 261 105 102 100 48 31...... 100 59 129 414 211 59 143 1917-18. 105 327 159 115 138 277 144 115 118 1 <£A in 'e 2...... 101 256 160 123 138 244 17ft 632 67.5 117 TO 7 96 207 172 131 110 ion 1QC 451 126 If O 64 1 7ft 9. 4...... 96 148 339 126 149 216 211 327 119 31.6 28 9 72 4 5...... 104 172 162 92 203 214 208 238 105 lift 108 91 6 6...... 60 178 _ 159 80 146 248 262 no A SA 1 93 4 98 4 7...... 43 181 153 112 159 263 132 241 77.5 48.0 106 60.0 8...... 100 172 136 117 135 220 179 O Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June, July. Aug. Sept. 1918-19. 1...... 183 130 78.4 236 198 485 398 205 153 134 116 296 2...... 167 102 133 483 i*m 645 353 324 174 126 88.0 250 146 67.2 131 QAA 172 551 316 ftf^A 171 120 55.5 VIA. 4...... 151 115 107 O/)A 183 404 9Qfi 278 149 38.9 715 5...... 117 130 124 576 ion 326 382 254 142 64.5 87.4 518 6...... 88.8 123 115 438 175 fift 230 142 70.0 IfW 329 7...... 133 122 73 4 329 160 331 298 217 118 1S6 115 27Q 8...... 130 114 43.8 289 147 288 271 215 96.5 120 126 276 9...... 138 112 126 272 111 391 273 212 141 117 72.4 279 10...... 126 63.3 117 264 145 867 271 210 138 119 48.5 316 11...... 124 71.0 107 216 134 686 282 492 141 125 110 335 12...... 95.6 130 121 159 150 491 318 592 139 72.3 92.8 505 13...... 67.2 129 164 183 lAft 383 302 509 140 26.9 96.0 540 14...... 117 107 1ft7 173 321 ooc 430 94.0 115 no 070 15...... 123 107 238 1(M oon 278 267 004 81.1 76.9 136 324 16...... 123 65.7 275 101 174 253 284 276 132 80.1 106 283 17...... 129 46.5 261 193 ISA 421 i ion 120 99.1 67.0 255 18...... 123 170 224 513 1,290 295 125 96.8 123 219 19 01 n 215 1QQ 142 162 610 645 322 127 89.2 107 200 20...... 71.1 190 179 177 1/IQ 626 4*1 259 126 125 121 168 21...... 127 170 165 188 144 511 0052 232 262 148 112 138 22...... 109 148 119 138 408 360 518 196 141 110 178 23...... 128 118 193 997 >t| 870 149 246 TO n 253 24...... 127 55.6 502 318 286 OQO 584 136 379 20.3 283 25...... 119 131 286 M!7 97 A. oco 293 380 129 228 116 25A 26...... 124 74.6 126 286 412 434c-in 241 258 347 152 163 211 27...... 66.2 111 276 351 oqK 997 9QQ 132 QA A 1 *& OQ 120 19 6 OOQ 440" 413 263 too 142 127 110 90 125 133 OK9 CQQ 997 OOJ 150 117 19fl 30...... 114 128 1 QQ oqrt 422 91 fi 176 146 117 135 164 31...... 115 176 209 412 157 114 385 1919-20. 185 911 320 165 144 132 614 445 184 176 61.6 43.5 2...... 190 220 304 162 186 132 643 432 183 1"vl 111 44 7 3...... 175 222 279 134 141 613 426 172 179 92.7 fil 9 4...... 165 258 252 too 147 134 380 364 181 105 33.8 5...... 120 262 1QQ 182 100 167 432 328 442 219 7.2 6...... 160 273 177 1B7 87.6 441 535 290 1,110 205 70 ft 4.3 7...... 170 OJR 151 146 &7 7 411 412 1QQ dQ ** KA « 8...... 175 216 1SR 141 108 408 376 268 524 161 86.5 56.1 9...... 197 9.4Q 141 112 414 QAC 413 376 134 30.5 10...... 170 177 379 11Q 113 387 323 457 300 84.3 84.1 31.0 11...... 165 171 365 88.9 143 4na 277 366 253 83.9 92.4 21.5 12...... 140 342 128 i *»fi 483 320 335 221 131 QC 9 4.9 13...... 170 172 321 138 160 1,370 360 323 194 124 96.4 82.8 14...... icn 174, 271 14ft 152 2 Q40 450 352 223 42.6 50.1 15...... 156 268 157 148 l'470 438 340 206 132 IfU. 64.3 16...... 195 117 258 225 193 1,120 414 284 183 138 148 63.5 17...... 185 149 225 234 247 1,670 479 305 319 95.7 139 41.7 18...... 176 151 188 W E 215 1,690 43Q 255 1.140 63.0 122 29.0 19...... 108 157 193 155 214 i ion 422 231 1,050 152 107 3.7 20...... 135 157 208 IQfi 204 QQA 341 - 224 585 145 108 38.5 21...... 143 152 198 136 185 702 315 224 469 131 w 1 27.3 22...... 166 133 232 137 142 695 412 446 441 126 51.6 27.4 23...... 157 91.6 209 114 na 748 433 567 340 110 115 17.9 24...... 148 140 176 73.2 192 837 625 526 279 79.2 78.9 31.5 25...... :.,... 160 133 on t ISA 931 575 398 239 140 52.0 28. 8 26...... 83.2 176 175 115 136 1,000 439 324 198 158 44.2 7.2 27...... 122 253 171 138 117 989. 354 278 162 150 54.4 70. a 28...... 112 267 125 151 123 798 4?tn 252 162 135 32.8 66.1 29...... 133 248 14ft 114 108 707 599 218 172 123 1.2 67.8 NOTE. The amount of rainfall is a weighted mean of records obtained at Hopkins Mills, Bocky Hill, South Sdtuate, and FiskeviUe, in the proportion of 2, 2,2, and 1, respectively. 102 SURFACE WATER SUPPLY, 191&-1920, PART I. THAMES RIVER BASIN. QOTNNEBAUG RIVER AT JEWETT CITY, CONN. LOCATION. About 1,000 feet below railroad bridge and 570 feet below outlet of canal from Slater Mills (mouth of Pachaug River), Jewett City, town of Griswold, New London County. DRAINAGE AREA. 712 square miles (measured on topographic maps). RECORDS AVAILABLE. July 17, 1918, to September 30, 1920. GAGE. Gurley 7-day water-stage recorder on left bank referenced to gage datum by hook gage inside well; an inclined staff is used for auxiliary readings. Recorder inspected by A. B. Ambot. DISCHARGE MEASUREMENTS. Made from cable. CHANNEL AND CONTROL. Channel of gravel and alluvial deposits; control for low stages is fairly well defined riffle a few hundred feet below the gage, at high stages the control is at head of rapids 2 J miles below the gage. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder, for year end ing September 30, 1919, 13.0 feet at 2 a. m. April 18 (discharge, by extension of rating curve, 7,000 second-feet); minimum stage from water-stage recorder, 3.88 feet at 3.45 p. m. August 23 (discharge, by extension of rating curve, 30 second- feet). Maximum stage for the year ending September 30, 1920, about 16.3 feet during high water of March 14-19, as determined from high-water marks (discharge, by extension of rating curve, 10,800 second-feet); minimum stage from water-stage recorder, 4.00 feet at 8 p. m. September 9 (discharge, by extension of rating curve, 42 second-feet). 1918-1920: Maximum stage, about 16.3 feet during high water of March 14-19, 1920 (discharge, by extension of rating curve, 10,800 second-feet); minimum stage from water-stage recorder, 3.88 feet August 23, 1919 (discharge, by extension of rating curve, 30 second-feet). ICE. Probably little, if any, effect from ice. REGULATION. The flow of Pachaug River, which drains 59.7 square miles and enters Quinnebaug River through the canal 570 feet above the gage, is under almost complete regulation. Numerous small reservoirs and power developments oh the main river and tributaries above the station also affect the distribution of flow. The operation of mills at Jewett City causes a large variation in discharge. ACCURACY. Stage-discharge relation practically permanent. Rating curve well de fined between 200 and 6,000 second-feet. Operation of water-stage recorder was satisfactory except for periods indicated in footnote to daily-discharge table. Daily discharge ascertained by use of discharge integrator. Records good. Discharge measurements of Quinnebaug River at Jewett City, Conn., during the years end ing Sept. 30, 1919 and 1920. Dis Gage Dis Date Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1919. Feet. Sec.-/*. Oct. 16 H. W. Fear...... 5.62 636 Jan. 4 M. R. Stackpole...... 10.92 4,830 IS .....do...... 5.87 734 4 .....do...... 10.85 4.850 19 .....do...... 4.96 361 6 .....do...... 8.75 2,840 20 4.65 235 Oct. 23 .....do...... 6.61 1,160 22 R H. Suttie...... 5.80 694 Dec. 23 .....do...... 7.34 1,690 Dec. 27 M. R. Stackpole...... 7.98 2,180 27 .....do...... 7.96 2.140 1920. Jan. 26 6.21 905 Sept. 26 4.53 214 THAMES RIVER BASIN. 103 Daily discharge, in second-feet, of Quinnebaug River at Jewett City, Conn., for the years ending Sept. SO, 1919 and 19W. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1,420 720 720 1,000 1,060 2,500 3,400 1,500 1,040 870 640 920 2...... 1,200 700 880 2,600 850 5,300 2,850 1,820 1,220 700 560 1,160 3...... 1,020 4ftft 760 4,300 1,160 4,700 2,550 1,900 1,160 630 375 1,380 4...... 900 710 850 4,600 1,200 3,500 2,300 1,740 970 350 590 2,900 5...... 800 740 760 3,100 1,120 2,800 2,100 1,880 950 265 590 3,300 6...... 640 700 820 2,700 1 fun 2,650 2,050 1,660 910 330 530 2,120 7...... 900 640 560 2,050 970 2 600 2,350 1,500 660 590 490 1,300 8...... 800 620 41>» 1 Qdft 780 2,100 2,100 1,420 4fln 610 4fln 1,340 9...... 760 580 fion 1,780 *uln 2,450 2,050 1,300 850 580 365 1,380 10...... 700 305 720 1,560 880 5,400 2,100 1,180 960 550 235 1,520 11...... 680 455 590 1,220 Q4ft 5,100 2,150 1,580 910 540 475 1,540 12...... 620 620 780 930 880 4,000 2,550 2,400 800 400 465 2,200 13...... 430 960 1,160 780 3,200 2,700 2,650 810 320 ASM 2,140 14...... 680 660 930 1,200 860 2,600 2 700 2,400 560 500 475 1,580 15...... 680 640 1,680 1,220 1,040 9 Ann 2,250 2,050 ^w 500 480 1,540 16...... W) 660 2,450 1,200 1,000 1,900 2,200 1,680 680 560 500 1,540 17...... 620 7fin 2,150 1 9on 1,160 2,600 5,900 1 400 660 680 285 1 94ft 18...... 640 1,600 1 7ftA 1,040 1 140 3,100 6,600 lUso 630 680 510 1 14ft 19...... 520 9 AAA 1,480 770 1,060 3,750 5,200 1,920 620 840 4Qf\ 1,020 20...... 971; 1,850 1 OAft 1 nun QfiA 3,950 3,900 1,700 660 750 470 7on 21...... CArt 1 "Ifift 960 1,050 QAA 3,700 3 40Q 1,580 760 870 500 . 570 22...... 580 1,200 760 1,050 TQA 9 QflA 2' 800 2,450 620 810 530 860 23...... 640 Qfin 1,340 1,100 Qfift 2,650 2,400 3,950 700 1,240 280 1,200 24...... 630 710 1,700 2,100 1 Q4ft 2 600 2 Q/V| 3,550 680 1,520 200 1 41ft 25...... 580 QAft 1,800 3,350 1 SAA 2 250 2,050 3,100 650 1,340 510 1,360 26...... J!7\ Qftft 2,200 9 fiAA 2,600 2,000 1,880 2 QAA fun ft4ft 630 1 QOft 27...... 265 Qftn 2,000 9 (*AA 3,450 1,880 1,660 2,350 700 600 610 07ft 28...... Kf>A 880 1 600 2 AAA 2,550 9 A*A 1,820 1 Qftn 1,220 730 570 620 29...... 600 880 1,000 1,760 4 400 1,720 1,620 990 730 550 Q4fl 30...... 650 850 1,160 I Cfift 4. 4Aft 1,500 1 ^ftft 960 710 700 930 31...... RQA 1 480 1 460 4,050 1,100 540 1,160 1919-20. 1...... 930 730 3,150 660 600 CLIft 4 7KA 3,500 1 44ft 1,200 325 500 2...... 840 850 2,450 880 880 970 4,300 3,200 1,200 1,060 580 470 3...... 1,540 2,050 690 830 1,060 4,500 9 QZf\ 850 1,280 640 500 4...... 1,500 1,640 j.on 810 920 4,250 2,550 1,100 1,800 550 don 5...... 330 1 440 1,420 finn 1,120 1,160 4. AAA 2 AKf\ 1,400 1,780 520 285 6...... 710 1,780 1,180 750 1,180 3,500 4,000 4,050 1,760 Mf\ 225 7...... 900 1,800 1,000 TQft 860 3,950 3,850 2 100 d. 4 NOTE. Water-stage recorder not in operation Oct. 3-4,1918, and Jan. 20-23, and Dec. 14-22,1919, Jan. 26-30, Mar. 14-19, and 28-31,1920; discharge estimated by comparison with records of Quaboag River- 104 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Quinnebaug River at Jewett City, Conn., for the years ending Sept. 30, 1919 and 1920. [Drainage area, 712 square mites.] ~* Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 1,420 265 674 a 947 1.09 2,000 305 863 1.21 1.35 2,450 415 1,200 1.69 1.95 4,600 770 1,840 2.58 2.97 February ...... 3,450 540 1,230 1.73 1.80 March...... 5,400 1,880 3,220 4.52 5.21 April...... 6,600 1,500 2,710 3.81 4.25 May...... 3,950 1,100 1,970 2.77 3.19 1,220 350 792 1.11 1.24 July...... 1,520 265 683 .959 1.11 1,160 200 507 .712 .82 3,300 570 1,410 1.98 2.21 6,600 200 1,430 2.01 27.19 1919-20. October...... 1,080 330 810 1.14 1.31 2,850 570 1,290 1.81 2.02 December...... 3,150 710 1,820 2.56 2.95 January... - - r 880 450 719 1.01 1.16 1,280 600 917 1.29 1.39 March...... 9,800 920 5,080 7.13 8.22 April...... 4,750 2,000 3,200 4.50 5.02 1/av 3,650 1,040 2,410 3.38 3.00 June...... 4,450 850 2,190 3.08 3.44 July...... 1,800 530 1,010 1.41 L63 August...... 1,320 235 625 .878 1.01 September...... 640 225 420 .590 .68 9,800 225 1,710 2.40 32.68 SHETUCKET RIVER AT SOUTH WINDHAM, CONK. LOCATION. At highway bridge in'South Windham, 3 miles below Willimantic, Windham County. DRAINAGE AREA. 406 square miles (measured on topographic maps). RECORDS AVAILABLE. November 14, 1919, to September 30, 1920. GAGE. Water-stage recorder on left bank, downstream side of bridge, referenced to gage datum by hook gage inside the well; chain gage on bridge is used for auxiliary readings. Recorder inspected by J. S. Lewis. DISCHARGE MEASUREMENTS. Made from bridge. CHANNEL AND CONTROL. Channel broken by one bridge pier, bed of gravel and alluvial deposits; control for ordinary stages is well-defined riffle about 1,000 feet below the gage, at extremely high stages control is probably at crest of dam 3 miles downstream. EXTREMES OF DISCHARGE. Maximum open-water stage recorded, 7.38 feet at 11.15 a. m. March 27 (discharge, by extension of rating curve, 5,930 second-feet); (a stage of 10.0 feet was recorded at 5 a. m. March 14, but the channel was obstructed by ice): minimum stage, about 1.45 feet on the morning of September 27 (discharge, by extension of rating curve, 25 second-feet). ICE. Occasional ice jams form at the control affecting the stage-discharge relation. REGULATION. Operation of mills at Willimantic causes large variations in discharge. THAMES RIVER BASIN. 105 ACCURACY. Stage-discharge relation probably permanent, except when affected by ice. Bating curve well defined between 100 and 3,500 second-feet. Operation of water-stage recorder somewhat unsatisfactory at various times; see footnote to daily-discharge table. Daily discharge ascertained by use of discharge integrator. Records fair. Discharge measurements of Shetucket River at South Windham, Conn., during the year ending Sept. SO, 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. Feet. Sec.-ft. Feet. Sec.-ft. Oct. 23 2.61 477 Jan. 2 03.76 670 Nov. 7 B. L. Bigwood...... 3.95 1.410 Mar. 31 .....do...... 5.63 3,270 9 3.12 693 July 28 2.72 506 4.53 1,970 Sept. 26 1.88 139 o Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Shetucket River at South Windham, Conn., for the year ending Sept. SO, 1920. Day. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 2,000 200 360 450 2,400 1,940 670 740 280 310 2...... 1,500 290 500 500 2,250 1,920 610 590 340 305 3...... 1,100 250 500 560 3,000 1,620 630 740 400 300 4...... 800 210 450 48ft 2,200 ],500 670 1,600 230 132 5...... 570 350 430 600 2,050 1,460 1,500 1,120 250 102 6...... 395 360 520 1,750 2,500 1,400 4,300 780 270 144 7...... 760 350 520 2.700 2.000 1,160 2,650 570 240 220 8...... 900 340 500 2,000 1,760 1,180 1,850 485 230 245 9...... 1,120 400 560 1,700 1,460 2,500 1,300 450 290 245 1Q...... 1,820 400 520 1,500 1,280 2,150 940 345 300 275 11...... 2,300 350 500 1,550 1,140 1,720 760 315 295 700 12...... 1,360 300 500 1,150 1,120 1,780 640 360 640 650 13...... 1,400 400 450 3,600 1,400 1,760 620 430 540 690 14...... 980 1,600 390 400 5,200 3,000 1,940 750 550 420 610 15...... 840 1,660 350 450 4,200 2,150 2,100 620 600 440 455 16...... 690 1,120 350 560 3,600 1,580 1,800 490 1,100 385 380 17...... 620 990 380 600 4,200 1,860 1,400 1,020 570 1,220 365 18...... 570 960 430 620 4,800 1,700 1,200 4,750 395 1,220 300 19...... 560 1,100 500 600 3,500 1,600 1,050 3,750 470 960 210 20...... 510 1,100 450 600 3,000 1,340 940 2,100 510 590 330 21...... 450 900 420 560 2,300 1,380 890 1,850 430 425 315 22...... 410 1,050 410 450 2,300 2.200 2,300 1,600 400 350 310 23...... 400 680 400 560 2,700 2,000 3,350 1,500 400 495 310 24...... 500 640 380 500 3,600 2,400 2,050 1.350 440 345 290 25...... 560 500 350 500 4,300 2,600 1,600 1,200 700 320 345 26...... 800 480 400 500 5,200 2,100 1,360 1,000 1,200 325 148 27...... 1,300 460 400 500 5,400 2,400 1,180 740 800 320 74 28...... 1,950 340 420 450 4,600 3,700 1,020 650 500 265 194 29...... 1,600 390 420 400 3,450 3,150 920 600 380 110 210 30...... 1,700 420 410 3,600 2,200 780 700 370 300 760 31...... 330 Aftn 2,900 710 320 330 NOTE. Stage-discharge relation affected by ice Dec. 18 to Mar. 20; daily discharge for this period based on gage heights, discharge measurements, weather records, and comparison with records of Quinnebaug River. Record from water-stage recorder incomplete Nov. 24 to Dec. 4; Jan. 15-17,19-24, 31; Feb. 1-4,12-29; Mar. 1-3; Apr. 24-28; May 15-19; June 8, 9, 21-26; July 22-28, 31; and Aug. 1-3. 106 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge ofShetucket River at South Windham, Conn., for the year ending Sept. SO, [Drainage area, 406 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1,950 400 849 2.09 1.32 2,300 330 992 2.44 2.81 500 200 370 .911 1.05 620 360 502 1.24 1.34 March...... 5,400 450 2,820 6.95 8.01 April...... 3,700 1,120 2,060 5,07 5.66 May...... 3,350 710 1,570 3.87 4.46 4,750 490 1,390 3.42 3.82 July...... 1,600 315 602 1.48 1,71 1,220 110 423 1.04 1.20 September...... '. 760 74 331 .815 .91 CONNECTICUT RIVER BASIN. FIKST CONNECTICUT LAKE NEAR PITTSBtTRG, N. H.' LOCATION. At dam of Upper Connecticut River & Lake Improvement Co. at outlet of lake, 6 miles northeast of Httsburg, Coos County. DRAINAGE AREA. 81.4 square miles. (From surveys by Connecticut Valley Lumber Co.) RECORDS AVAILABLE. October 1, 1916, to September 30, 1920. GAGE. Four staffs, one near each outlet gate, all to the same datum which is 0.9 foot above the sill of the lowest outlet gate. EXTREMES OF STAGE. Maximum stage recorded for the year ending September 30, 1919, 24.15 feet December 11-14 (water stored, 2,645 million cubic feet)8; minimum stage recorded 6.0 feet September 8 (water stored 600 million cubic feet).8 Maximum stage recorded for the year ending September 30, 1920, 21.25 feet December 26-28 (water stored, 2,276 million cubic feet)8; minimum stage re corded, 3.2 feet March 15 (water stored, 347.4 million cubic feet).8 1917-1920: Maximum stage recorded, 24.15 feet December 11-14, 1918 (water stored, 2,645 million cubic feet)8; minimum stage recorded, 2.1 feet February 17, 1917 (water stored, 252.5 million cubic feet)8. REGULATION. The capacity of the lake is 2,651 million cubic feet at gage height 24.2. The storage is controlled by three gates, the sills of which vary from 0.9 to 14.4 feet on the gage. The records show only fluctuations in the level of the lake and are used in making corrections, for effect of storage, to observed records of flow of Connecticut River. Additional storage has been developed in Second Lake and on tributary streams. 7 Previously published with records for Connecticut River at First Lake, N. H. s Does not include water stored in Second Lake or tributaries. CONNECTICUT RIVER BASIN. 107 Daily gage height, in feet, of First Connecticut Lake near Pittsburg, N. H.,for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dee. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. l.. ..:....-..... 11.1 21.4 23.6 23.7 20.9 10.65 9.7 18.2 21.0 '16.1 10.4 6.75 2...... 11.35 22.05 23.75 23.7 20.8 10.5 9.9 18.8 20.8 15.7 10.15 6.6 3...... 11.5 22.5 23.8 23.7 20.65 10.2 10.0 19.6 20.5 15.15 9.8 6.55 11.6 22.9 23.85 23.7 20.55 10.05 10.0 20.1 20.3 14.8 9.7 6.4 5..:...... 11.7 23.2 23.9 23.75 20.45 9.9 10.0 20.4 20.1 14.15 9.6 6.3 6...... 12.2 23.35 23.9 23.7 20.3 9.65 10.1 21.3 20.15 13.55 9.5 6.2 7...... 13.6 23.35 23.95 23.65 20.15 9.4 10.3 21.9 20.05 13.15 9.4 6.1 8...... 14.35 23.4 24.0 23.65 20.0 9.2 10.5 22.2 20.15 12.7 9.35 6.0 9...... 14.95 23.4 24.05 23.65 19.9 9.1 10.7 22.2 20.2 12.3 9.25 6.2 10...... 15.4 23.45 24.1 23.55 19.8 8.95 10.85 22.3 20.25 11.95 9.1 6.3 11...... 15.75 23.55 24.15 23.6 19.6 8.8 11.05 22.2 20.35 11.55 9.0 6.35 12...... 16.05 23.55 24.15 23.65 19.3 8.65 11.5 22.1 20.3 11.3 8.9 6.45 13...... 16.2 23.55 24.15 23.65 18.95 8.45 12.05 22.1 20.2 11.0 8.8 6.85 14...... 16.55 23.6 24.15 23.7 18.7 8.3 12.5 22.05 20.35 10.9 8.65 6.95 15...... 16.65 23.65 24.2 23.75 18.2 8.15 12.95 21.9 21.25 10.5 8.6 7.0 16...... 16.7 23.75 24.05 23.75 17.6 8.0 13.05 21.3 21.65 10.4 8.5 7.05 17...... 16.75 23.9 23.9 23.3 17.3 7.85 13.55 21.1 21.65 10.2 8.45 7.1 18...... 17.0 24.0 23.8 22.9 17.0 7.7 13.75 21.5 21.5 9.9 8.35 7.15 19...... 17.15 24.0 23.8 22.5 16.65 7.6 13.95 21.5 21.2 9.7 8.25 7.2 20...... 17.2 23.9 23.85 22.2 16.15 7.45 14.15 21.5 20.8 9.6 8.1 7.25 21...... 17.5 23.85 23.9 22.1 15.65 7.55 14.4 21.45 20.6 9.5 8.0 7.25 22...... 17.7 23.7 23.95 22.05 15.1 7.7 14.65 21.5 20.25 9.9 7.9 7.25 23...... 17.9 23.45 24.0 21.9 14.5 7.8 15.05 21.55 19.95 10.3 7.75 7.15 24...... 18.0 23.25 24.15 21.8 13.85 7.9 15.6 21.55 19.45 10.6 7.5 7.15 25...... 18.25 23.15 24.15 21.75 13.2 8.1 16.0 21.6 18.95 10.85 7.5 7.1 26...... 18.45 23.0 24.0 21.6 12.6 8.2 16.8 21.9 * 18.4 11.1 7.4 7.05 27...... 18.6 23.15 23.85 21.5 12.0 8.3 17.0 21.8 18.0 11.2 7.25 7.0 28...... 18.8 23.25 23.75 21.45 11.35 8.55 17.0 21.65 17.75 11.4 7.15 6.7 29...... 19.0 23.4 23.75 21.3 9.0 17.45 21.4 17.2 11.25 7; 05 6.5 30...... 19.5 23.5 23.7 21.15 9.3 17.9 21.2 16.6 11.0 6.95 6.55 31...... 20.5 23.7 21.0 9.5 21.1 10.65 6.85 1919-20. 1...... 6.6 13.75 19.95 20.0 6.95 9. O 3.9 10.4 18.9 15.3 16.35 12.7 2...... 6.7 14.3 20.05 19.65 6.8 3.85 3.95 10.5 18.3 15.25 16.65 12.1 3...... 6.85 14.65 20.15 19.25 6.75 3.75 4.1 11.05 17.8 15.05 16.95 11.5 4...... 6.95 14.95 20.25 18.75 6.6 3.7 4.35 11.85 17.15 15.0 17.2 10.85 5...... 7.0 15.3 20.35 18.3 6.5 3.7 12.5 16.5 14.9 17.4 10.3 6...... 7.15 15.6 20.4 17.9 6.4 3.65 4.9 13.05 16.2 14.8 17.55 9.8 7...... 7.65 15.85 20.5 n KK 6.3 3.65 5.1 13.55 16.0 14.6 17.65 9.35 8...... 8.0 16.1 20.55 17.25 6.2 5.25 14.05 15.95 14.6 17.75 8.95 9...... 8.35 16.25 20.6 16.95 6.1 3.6 5.35 14.9 15.85 14.55 17.85 8.6 10...... 8 7 20.7 16.6 6.0 3 EC 5 A 15.7 15.8 14.55 17.9 8.2 11...... 9.2 16.65 20.8 16.2 5.9 3.5 5.45 16.4 15.7 14.6 17.65 7.95 12...... 9 ^ 16.85 20.8 1 K Q 5 0 3 A 5.5 17.15 15.6 14.9 17.05 7.85 13...... 9.9 17.1 20.85 1 C A 5.7 3.35 5 CK 17.75 15.5 15.0 16.6 8.1 14...... 17.4 20.95 14.9 5.6 3.3 5.9 18.3 15.4 15.15 16.3 8.35 15...... 10.4 17.65 21.0 14.3 5 KK 3.2 6.1 18.8 15.3 15.4 15.9 8.45 16...... 10.65 17.85 21.0 13.7 5 C 3.35 6.3 18.95 15.25 15.35 15.6 8.6 17...... 10.95 18.0 21.05 13.05 5 A 3.35 6.4 19.05 15.25 15.3 15.35 8.8 18...... 11.2 18.2 21.1 12.3 5.3 3.3 6.55 19.2 15.25 15.3 15.3 9.05 19...... 11.4 18.35 21.1 11.7 5 OC ^ 3 6.7 19.3 15.2 15.3 15.2 9.2 20...... U ce 10 e 21.1 10.85 5 1C 3 9 ' 7.0 19.5 15.15 15.3 15.2 9.3 21...... 11.75 18.65 21.15 U q 5.1 3 9 7 ^f\ 19.6 15.1 15.05 15.25 9.5 22...... U QE 10 0 21.15 9 0 5.0 3.3 7.65 19.9 15.1 14.85 15.3 9.7 23...... 12.15 18.95 21.2 9.3 4.7 3.3 8.05 20.25 15.05 14.75 15.4 9.85 24...... 12.1 19.1 21.2 8.85 4 <» 3.3 8.5 20.35 14.95 14.75 15.45 10.0 25...... f> 1 f\ 1Q OS 21.2 8.45 4.4 ^ 3 8.75 20.5 14.9 14.7 15.5 10.15 26...... 19 qc 1O *^f\ 21.25 8.1 4.3 3 A 9.0 20.55 14.8 14.65 15.5 9.95 27...... 12.4 1Q A.*\ 21.25 7.8 4.2 3.55 9.2 20.45 14.7 14.6 15.35 9.95 28 12.45 19.55 21.25 7.5 4.15 3 7C 9 AS 20.35 14.6 14.55 14.85 9.9 29...... T> 1 19.65 21.0 7 *> 4.0 4.05 9 a 20.1 14.55 15.0 14.1 9.9 30...... 12.7 19.8 20.8 7.15 3.65 10.2 19.8 15.0 15.45 13.65 9.15 31...... 13.0 20.4 7.05 3.8 19.4 16.0 13.25 108 SURFACE WATER SUPPLY, 1919-1920, PART I. CONNECTICUT RIVER AT FIRST CONNECTICUT LAKE, NEAR PITTSBURGH, N. H. LOCATION. At the outlet of First Connecticut Lake, 6 miles northeast of Pittsburg, Coos County. DRAINAGE AREA. 81.4 square miles, (From survey by Connecticut Valley Lumber Co.) RECORDS AVAILABLE. April 1, 1917, to September 30, 1920. GAGES. Gurley 7-day water-stage recorder on right bank about one-fourth mile below the outlet dam, installed in July, 1918; inclined'staff gage at same location in stalled in November, 1917, and used in determining sluice-gate ratings; scales on gate frames indicate amount of sluice-gate openings; staff gage in lake above dam. DISCHARGE MEASUREMENTS. Made from log bridge half a mile below gage, by wad ing, or from cable 200 feet above gage. CHANNEL AND CONTROL. Channel rough with rock bottom; channel at cable section has been improved by removal of rocks and ledges; control for river gage is rock ledge that extends completely across the stream; about 3 feet of fall immediately below ledge. COMPUTATION OP DISCHARGE. Beginning July 28, 1918, discharge determined from water-stage recorder graph. Previous to installation of recorder, discharge through three sluice gates, 6, 8, and 20 feet in width, determined from gate ratings based on current-meter measurements and comparative readings of river gage, or from daily readings of river gage when gates remained at same opening for 24 hours. Discharge through one water wheel, used when slasher was in operation, deter mined from figures of water wheel efficiency and power output. ICE. Practically no effect from ice on the control section for river gage; formation of ice in the sluice-gate openings materially changes conditions at gates. REGULATION. About 4.1 billion cubic feet of storage has been developed in lakes and ponds above the gage; all records of monthly discharge have been corrected for effect of storage in First Lake, and, since October 1, 1919, for effect of storage in Second Lake. ACCURACY. Stage-discharge relation for river gage practically permanent, except when affected by log jams. Rating curves for river gage well defined below 800 second-feet. Operation of water-stage recorder satisfactory. Rating curves for middle and upper leaves of 6 and 8 foot gates fairly well defined for periods used. Rating curves for lower sections of gates and for conditions of weir discharge somewhat uncertain. Daily discharge since July 28,1918, ascertained by apply ing rating table to gage heights at river gage, except for period May 7 to July 12, 1919, when discharge was ascertained by applying rating tables to records of gate openings, giving due consideration to times of opening and closing gates and changes in gate settings. (See " Computation of discharge.") Records good when river gage was used and fair for periods when records of gate openings were used. Discharge measurements of Connecticut River at First Connecticut Lake, near Pittsburg, N. H., during the year ending Sept. 30,1919. Dis Dis Date. Made by height. charge. Date. Made by iSi charge. Feet. Sec.-ft. Feet. Sec.-ft Nov. 25« 2.21 147 Feb. 2 M. R. Stackpole...... 2.60 303 266 .....do...... 1.47 20.6 2 .....do...... 2.60 311 266 .....do...... 2.06 90 3 .....do...... 3.14 656 Jan. 31 2.39 194 3 .....do...... 3.19 723 31 .....do...... 2.39 3 .....do...... 1.44 17.8 31 .....do...... 2.56 269 4 .....do...... 2.25 167 31 .....do...... 2.56 258 4 .....do...... 2.04 94 Feb. 1 .....do...... 2.91 523 4 .....do...... 1.95 69 1 .....do...... 2.76 398 4 .....do...... 1.78 41.7 1 2 76 4O9 .....do...... <> -10 116 2 .....do...... 3.05 587 4 .....do...... 2.44 241 2 .....do...... 3.05 593 « Measurement made about half a mile below gage; practically no inflow between gage and measuring section. Section rough and conditions unsuitable for current-meter measurements. 6 Measurement made by wading 300 feet above gage. NoTE.t-Measurements made at cable section except as noted. CONNECTICUT BIVEB BASIN. Daily discharge, in second-feet, of Connecticut River at First Connecticut Late near Pitts- burg, N. 6., for the years ending Sept. 30,1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 11 16 37 153 315 .487 16 28 445 855 519 170 2...... 12 15 41 153 316 322 60 29 481 863 493 164 3...... 12 14 45 153 287 317 101 30 466 792 415 160 4...... 12 16 51 153 177 307 120 30 302 1.020 240 155 5...... 12 18 54 153 202 302 69 32 169 1,020 236 144 6...... 41 19 57 153 236 297 17 74 270 990 232 7...... 18 20 l=O 153 232 295 18 402 166 718 217 143 8...... 14 20 64 149 232 290 19 569 170 678 227 143 9...... 12 20 65 289 232 283 18 638 172 642 224 62 10...... 12 23 67 32 312 270 18 655 342 607 219 14 11...... 11 24 70 35 474 272 19 638 310 441 219 14 12...... 11 24 70 38 540 267 20 622 310 339 217 16 13...... 10 26 74 39 450 260 20 617 297 319 214 15 H...... 10 30 76 41 503 253 20 615 211 298 212 14 15...... 10 34 203 42 572 247 20 580 402 326 210 14 16...... 10 39 339 382 565 238 20 478 272 315 210 14 17...... 10 44 269 690 578 232 20 529 154 305 214 14 18...... 10 281 115 633 638 225 20 716 294 255 214 13 19...... 10 552 621 636 216 20 599 430 180 210 13 a)...... 11 447 49 294 635 106 20 504 544 159 210 13 21...... 11 373 51 75 710 15 20 502 570 145 208 61 22...... 11 488 56 252 780 15 20 504 420 139 203 149 23...... 11 386 64 249 804 15 22 50& 633 123 201 149 24...... 11 380 212 284 821 16 22 482 910 110 199 149 25...... 11 347 311 280 798 16 22 521 1,010 125 195 149 26...... 11 166 327 753 15 24 572 896 142 191 149 27...... 10 22 203 272 839 16 25 557 584 132 186 250 28...... 10 24 164 267 813 18 25 521 630 317 180 339 29...... 10 27 247 16 25 488 840 606 178 295 30...... 25 qi 160 120 16 27 484 895 576 173 291 31...... 36 156 149 16 591 549 172 1919-20. 1...... 302 22 23 526 292 135 240 160 792 124 75 912 2...... 307 22 23 277 121 229 157 847 432 80 873 3...... 312 22 24 637 262 110 214 174 839 281 82 865 4...... 317 21 24 656 253 107 113 224 840 283 88 796 5...... 322 20 24 555 245 95 8 12; 740 335 88 746 6...... 207 19 25 470 240 97 8 258 533 2g5 88- - 714 7...... 17 22 25 474 232 101 8 248 383 350 91 659 8...... 17 22 25 438 227 98 8 .12 301 280 88 613 9...... 16 20 26 462 219 92 8 12 306 307 88 583 10...... 17 19 27 497 206 86 8 14 296 329 332 540 11...... 17 19 28 556 197 83 8 14 290 310 739 406 12...... 17 18 29 591 188 74 8 15 290 162 778 297 13...... 17 20 29 611 176 106 8 16 280 144 547 228 14...... 18 20 29 669 171 121 8 15 274 140 588 161 15...... 18 20 29 670 164 114 8 290 240 140 690 56 Ifr...... 18 19 30 766 156 104 8 533 168 140 614 8 17...... 19 19 30 501 149 95 8 479 160 140 329 8 18...... 19 20 30 878 140 89 8 554 156 140 368 136 19...... 19 20 30 787 138 86 9 554 156 186 228 168 20...... 19 20 30 706 135 80 9 554 156 264 75 8 21...... 19 20 30 643 135 83 9 508 156 342 75 8 22...... 66 20 30 598 204 83 9 324 152 386 75 8 23...... 208 21 30 547 227 78 10 361 148 140 75 8 24...... 182 21 30 498 214 74 10 400 148 136 75 7 25...... 158 22 30 451 196 72 10 402 144 136 75 216 26...... 72 22 ?n 419 184 76 10 400 140 136 181 325 27...... 209 22 30 381 172 89 10 400 140 119 585 213 28...... 219 22 194 350 159 104 10 465 140 69 818 213 29...... 161 24 293 149 192 11 574 140 69 910 209 30...... 20 24 468 302 245 35 597 122 72 814 209 31...... 22 530 297 245 762 75 882 110 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Connecticut Rivet at First Connecticut Lake near Pittsburg, N. H., for the years ending Sept. SO, 1919 and 1920. (Drainage area, 81.4 square miles.) Gain or loss Discharge corrected Observed discharge (second-feet.) in storage for storage (second- in First feet). and Second Connec Run-off Month. ticut in inches. lakes Per Maximum. Minimum. Mean. (millions Mean. square of cubic mile. feet).o 1918-19. 41 10 13.4 +1,103.3 425 5.22 6.02 652 14 131 +377. 5 277 3.40 3.79 339 37 120 +25.6 129 1.58 1.82 690 32 220 -341.6 92 1.13 1.30 839 177 516 -1,104.9 59 .725 .76 487 15 183 -194.6 110 1.35 1.56 120 16 29 +922.6 385 4.73 5.28 May...... 716 28 455 +389.4 600 7.37 8.50 1,010 166 453 -541.8 244 3.00 3.35 July...... 1,020 110 454 -651.1 211 2.59 2.99 519 172 233 -384.0 90 1.11 1.28 339 13 114 -28.6 103 1.27 1.42 The year. . . 1,020 10 242 -428.2 228 2.80 38.07 1919-20. 332 16 108 +307. 1 223 2.74 3.16 24 18 20.7 +752. 1 311 3.82 4.26 530 23 72.1 + 143.0 126 1.55 1.79 878 297 542 -1.454.7 <>) w (") 292 135 197 -451. 8 17 .209 .23 245 72 108 +92.3 142 1.74 2.01 April...... 240 8 35.0 + 1,220.0 506 6.21 6.93 May...... 762 12 306 +884.7 636 7.81 9.00 847 122 316 -548.4 104 1.28 1.43 July...... 432 69 208 +241.8 298 3.66 . 4.22 882 75 343 -742.1 66 .811 .94 912 7 340 -588.3 113 1.39 1.55 The year. . . 912 7 217 144.3 212 2.60 35.52 Not computed for Second Lake, for year ending Sept. 30,1919. b Depletion of storage during January slightly exceeded total discharge past the gage during the month. CONNECTICUT RIVER BASIN. Ill CONNECTICUT RIVER AT OEFORD, N. H. LOCATION. At covered highway bridge between Orford, N. H., and Fairlee, Vt., 8 miles downstream from Waits River and 22 miles above White River. DRAINAGE AREA. 3,100 square miles. RECORDS AVAILABLE. August 6, 1900, to September 30, 1920. GAGE. Chain on upstream side of bridge, and inclined staff on left bank 25-feet below bridge. DISCHARGE MEASUREMENTS. Made from the bridge or from cable 500 feet above the bridge. CHANNEL AND CONTROL. Channel wide and deep, with gravelly bottom; control for high stages is probably at the dam at Wilder, 20 miles downstream. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30, 1919; 21.35 feet at 7 a. m. April 14 (discharge, 29,600 second-feet); mini mum stage recorded, 3.t) feet at 6 p. m. August 23 (discharge, 820 second-feet). Maximum stage recorded for the year ending September 30, 1920, 24.8 feet at 7 a. m. March 29 (discharge, by extension of rating curve, 37,200 second-feet); minimum discharge, 980 second-feet February 27 to March 4 (stage-discharge relation affected by ice). 1900-1920: Maximum stage recorded, 33.4 feet at noon March 28, 1913 (dis charge, by extension of rating curve, 57,300 second-feet); minimum 24-hour discharge, 288 second-feet, September 28, 1908. ICE. Stage-discharge relation affected by ice, usually from December to March; ice cover usually remains in place throughout the winter. REGULATION. About 4,100 million cubic feet of storage has been developed at First and Second Connecticut lakes and on tributary streams above Pittsburg. No correction made for storage in lakes from August 6, 1900, to September 30, 1916; correction made for storage in First Lake October 1, 1916, to September 30, ]919, and for storage in First and Second lakes October 1, 1919, to September 30,1920. -. There are several power developments above the station, but the operation of these mills does not seriously affect the distribution of flow. ACCURACY. Stage-discharge relation affected at times by use of flashboards at Wilder dam and during the winter by ice. Several rating curves have been used, each fairly well denned for range covered. Gage read to half-tenths twice daily. Daily discharge ascertained by applying rating table to mean daily gage height, with correction for ice during the winter. Records good. Discharge measurements of Connecticut River at Orford, N. H., during the years ending Sept. SO, 1919 and 1< Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge, 1918. Feet. Sec.-ft. 1919. Feet. Sec.-ft. 9.01 6,930 7.46 4,800 .....do...... 15.00 14,800 July 18 4.37 1,310 16 .....do...... 7 1ft A RKfi 29 3.78 1.200 3.50 998 1919. Sept. 16 7.66 4,540 Jan. 21 08.97 3,460 Feb. 10 o7.38 2.400 1920. Mar. 3 ol0.80 5,910 Feb. 19 H.S. Price...... o6.00 1,020 o Stage-discharge relation affected by ice. 112 SURFACE WATER SUPPLY, 1919-1920, PAR± I. Daily discharge, in second-feet, of Gonnectieut River at Oxford N. H.,for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. I...'..... 8,600 28,900 6,100 3,300 3,500 3,2&0 12,600 10,200 4,150 4,100 1,260 1,530 2...... 6,360 28,400 5,100 3,900 3,000 4,700 9,770 10,400 3,930 3,490 1,600 1,810 3...... 5,580 25,000 4,«00 5,800 2,800 5,800 8,490 11,800 3,820 2,650 1,530 1,640 4...... 5,840 18,000 4,500 6,100 3,800 5,500 7,880 11,800 3,600 2,600 1,530 1,500 5...... 5,840 12,000 4,400 5,700 2,800 5,400 7,600 11,600 3,270 2,510 1,420 1,470 6...... 10,800 9,920 4,300 5,000 2,800 6,700 8,740 12,300 2,950 2,460 1,290 1,210 7...... 26,500 8,740 4,300 4,400 2,600 6,200 12,000 12,100 2,850 2,170 1,370 8...... 28,000 7,600 4,500 4,400 2,200 5,500 17,000 11,600 3,600 2,000 1,320 9...... 25,000 6,900 4,300 4,600 2,400 5,300 18,900 10,100 4,720 1,930 1,060 1*670 10...... 17,400 6,630 4,200 4,300 2,400 6,800 17,800 8,880 5,840 1,870 1,010 2,190 11...... 11,500 7,040 4,000 3,900 2,000 6,700 15,700 8J320 5,200 1,840 985 2,390 12...... &450 7,320 4,000 3,500 2,000 6,000 20,700 77460 4,150 1,780 960 2,960 13...... 3,900 6,630 4,300 3,000 2,100 5,900 28,900 6,760 3,270 1,530 960 5,910 14...... 6,360 6,100 4,700 3,000 2,100 5,000 29,500 6,100 2,750 1,260 1,010 8,520 15...... 6,100 5,580 6,000 3,300 2,200 4,000 28,400 5,580 2,560 1,500 1,080 7,400 16...... 5,580 4,^60 8,600 3,500 2,200 3,800 23,200 5,580 2,650 1,530 1,110 5,050 17...... 4,960 4,960 9,500 3,000 2,200 3,600 18,500 5,460 3,490 1,500 1,260 3,500 18...... 4,840 5,330 8,000 3,200 2,100 3,400 16,600 7,740 4,610 1,470 1,440 2,860 19...... 7,460 7,040 6,000 3,200 1,900 5,000 15,200 10,800 4,960 1,320 1,340 2,370 20...... 8,160 10,700 5,100 3,200 1,850 7,200 13,900 9,920 4,040 1,340 1,320 2,120 21...... 7,740 11,300 4,600 3,500 1,850 12,000 12,300 8,300 3,380 1,290 1,180 1,900 22...... 8,450 10,700 4,400 3,500 1,850 17,000 11,800 7,180 2,950 960 1,010 1,760 23...... -- 8,600 9,180 5,500 3,300 1,900 14,800 11,300 13,700 2,290 1,010 910 1,760 24...... 7,460 8,160 9,900 3,700 2,100 13,200 10,700 12,500 2,290 1,110 910 2,040 25...... 6,100 7,180 12,500 4,700 2,200 11,600 11,200 10, 400* 1,950 1,110 985 2,420 26...... 5,580 6,500 13,500 5,300 2,200 10,500 12,300 9,030 2,030 1,130 1,320 2,680 97 7,320 5,080 11,600 5,300 2,200 10,200 11,300 8,300 2,380 1,160 1,670 2,960 OQ $,300 4,610 7,500 5,200 2,200 17,200 10,100 7,460 3,270 1,130 1,440 3,100 29....-.-. 7,740 5,330 6,000 4,800 27,400 8,300 6,360 5,330 1,160 1,420 2,640 80...... 7,320 6,100 4,600 4,400 22,700 10,100 5,330 4,840 1,290 1,320 2,080 31...... 19,300 3,800 3,900 17,200 4,610 1,130 1,260 1919-20. 1...... 1,900 9,850 10,000 2,600 1,220 980 31,000 25,200 4,840 2,820 2,910 2,040 1,600 16,900 10,600 2,700 1,220 980 26,300 21,300 4,610 4,810 3,600 2,200 3...... 1,900 17,600 7,600 2,600 1,220 980 22,500 18,700 4,500 5,650 3,300 2,460 ...... 3,300 13,800 &,700 2,400 1,220 980 19,500 16,600 4^.60 4,470 2,640 2,370 5,050 10,000 5,600 2,200 1,200 1,100 161,600 15,300 4,150 4,470 2,040 2,280 6...... 4,700 7,600 5,450 2,100 1,200 1,250 21,500 13,500 4,380 4,140 1,900 2,280 7...... 5,300 6,600 5,300 2,000 1,180 1,400 22,500 12,300 5,080 3,920 1,700 2,280 8....-..- 7,000 6,000 5,450 2,000 1,180 1,600 17,000 12,600 5,960 3,700 1,700 2,120 9...... 6,450 5,700 6,000 1,900 1,160 1,700 13,300 16,300 5,960 3,100 1,640 2,460 10..-...-- 4,950 5,350 6,800 1,800 1,160 1,750 10,400 19,300 4,720 3,300 1,340 2,730 11...... 5,150 4,850 6,350 1,700 1,120 1,680 9,620 18,900 4,260 3,400 1,520 2,820 12...... 8,050 4,700 6,000 1,600 1,100 1,700 9,470 17,000 3>930 3,200 1,580 2,910 13.....--- 7,600 8,800 6,500 1,550 1,100 2,050 12,000 13,700 2,850 2,730 1,830 3,400 14*.....-- 5,900 15 000 6,900 1,500 1,060 3,350 28,400 11,500 2,560 1,900 2,730 7,000 15..------4,600 15,400 7,000 1,500 1,060 4,350 29,700 10,100 2,380 2,460 3,400 6,720 1 A 3,800 12,300 6,100 1,450 i run 4,800 26,300 9,180 2,380 2,910 5,050 5,410 17...---- 4,050 8,200 5,350 1,450 1,040 5,200 26,500 8,450 2,380 2,910 4,470 4,250 10 4,250 6,8(00 4,500 1,450 1,020 6,250 24,800 9,030 2,200 2,550 3,600 3,810 19 ...... 4,350 6,250 3,820 1,450 1,020 6,250 22,700 9,620 2,130 2,370 2,910 4,580 20 ...... 4,050 6,000 3,520 1,450 1,020 5,700 21,100 9,920 2,040 2,370 2,460 5,530 21...... 3 KAJY 5,-600 3,200 1 450 1,020 5,200 21,700 9,920 2,200 3,200 1,830 5,170 23...... 3,300 4,950 3,100 1^460 1,020 4,600 28,000 12,500 1,970 3,810 1,580 4,030 23...... 4,600 5,200 2 950 1 400 1,000 4,350 31,900 14,200 2,040 3,500 1,580 3,500 24 5,750 6,900 97 OKI 1^300 1,000 5,200 32,£00 U finn 2 (\Ajf\ 3,500 1,580 2,820 25...... 5,400 7,500 2,800 1,250 i nnn 8,000 31,900 in 4nn 1,760 3,500 2,280 2,376 26...... 4,700 .6,800 2,500 1,250 1,000 12,600 27,600 8,740 1,700 3,400 2,280 2,120 tjH 4,350 6,100 2 OKA 1,250 QSfl 21,100 22,300 7,740 1,580 2,910 1,760 1,970 28...... 4,450 5,350 2,350 1,300 980 31,000 19,700 7,180 1,580 2,280 1,580 1,970 29...... 4,700 4,700 2,600 1,250 QSfl 36,300 26,500 6/220 1.580 1,830 1,590 2,120 30...... 4,800 5,700 2,700 1,250 36,400 28,000 5,330 1,640 1,580 1,460 2,820 31...... 4,700 2,700 1,250 35,600 5,330 1,580 1,640 NOTE. Stage-discharge relation affected by ice Dec. 1. 1918, to Mar. 21. 1919, and Dec. 3, 1919, to Mar. 29,1920. Discharge for these periods based on gage heights corrected tor effect of ice by means of discharge measurements, observer's notes, and weather records. CONNECTICUT RIVER BASIN. 118 Monthly discharge of Connecticut River at Orford, N. &,,for tiwyear ending Sept. SO, 1919. [Drainage ares, 3,160 square miles.] Observed discharge Gain or loss Discharge corrected ! (second-feet). in storage for storage at First (second-feet). Month. Connecticut Run-off Late In inches. (millions of Per Maximum. Minimum. Mean. cubic feet). Mean. squaremile. 28,000 4,840 9,810 +1,103.3 10,200 3.29 3.79 28,900 4,610 9,630 +377.5 9,780 3.15 3.51 December...... 13,500 8,800 6,140 +25.6 6,150 1.98 2.28 January...... 6,100 !,000 4,130 -341.6 4,000 1.29 1.49 3,500 ,850 2,300 -1,104.9 1,840 .594 .62 March...... 27,400 ,200 8,980 -194.6 8,910 2.87 3.31 April...... 29,500 ,600 14,700 +922.6 15,100 4.87 5.43 May...... 13,700 4,610 8,950 +389.4 9,100 2.94 3.39 June...... 5,840 f,950 3,570 -541.8 3,360 1.08 1.20 July...... 4,100 960 1,720 -651.1 1,480 .477 .55 1,620 910 1,230 -384.0 1,090 .352 .41 8,520 1,180 2,730 -28.6 2,720 .877 .98 The year... 29,500 910 6,180 -428.2 6,170 1.99 26.96 NOTE. Correction made for storage in First Lake. Monthly discharge of Connecticut River at Orford, N. H., for the year ending Sept. SO, 19tO [Drainage area, 3,100 square mites.] Gain or loss Discharge corrected Discharge in Second-feet. in storage for storage at (second-feet). Month. Connecticut Run-off lakes in inches. (millions of Per Maximum. Minimum. Mean. cubic feet). Mean. squaremile. October...... 8,050 1,600 4,650 +307.1 4,760 1.54 1.77 17,600 3,700 8,220 +752. 1 8,510 2.75 3.07 10,600 3,350 4,990 +143.0 5,040 1.63 1.88 January...... 2,700 ^,250 1,670 -1,434.7 1,130 .365 .42 1,220 930 1,090 I ei o 910 .294 .32 36,400 980 8,210 +92.3 8,240 2.66 3.07 32.800 9L470 22,700 +1,220.0 23,200 7.48 8.34 25,200 5^330 12,500 +884.7 12,800 4.13 4.76 5,960 1 580 3,120 1:18 d 2,910 .939 1.05 July...... 5,650 1 580 3,170 -241.8 3,260 1.02 1.18 5,050 1,340 2,300 -742.1 2,020 .652 .75 7,000 1^970 3,280 -588.3 3,050 .984 1.10 The year... 36,400 980 6,320 -144.3 6,320 2.04 27.71 » NOTE. Correction made for storage in. First Connecticut Lake and Second Connecticut Lake. 102721 23 WSP 501 8 114 SURFACE WATER SUPPLY, 1919-1920, PART I. CONNECTICUT RIVER AT SUNDERLAND, MASS. LOCATION. At five-span steel highway bridge at Sunderland, Franklin County, on road leading to South Deerfield, 18 miles in a direct line and 24 miles by river above dam at Holyoke. Deerfield River enters the Connecticut from the west 8 miles above station. DRAINAGE AREA. 8,000 square miles. RECORDS AVAILABLE. March 31, 1904, to September 30, 1920. GAGES. Chain on downstream side of bridge; Sanborn water-stage recorder installed September 3, 1916. Gage read and recorder inspected by Mary S. Hull. DISCHARGE MEASUREMENTS. Made from highway bridge. CHANNEL AND CONTROL. Channel deep, with bottom of coarse gravel and alluvial deposits. Control at low stages not well defined but practically permanent. At high stages the control is at the crest of the dam at Holyoke. EXTREMES OP DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 23.55 feet at 11 a. m. March 29 (discharge, 78,200 second-feet); minimum stage recorded, 0.3 foot at 8 a. m. July 21 and 8.30 a. m. July 28 (discharge, by extension of rating curve, 500 second-feet). Maximum stage for the year ending September 30, 1920, 28.1 feet during the night of March 27-28 (discharge, by extension of rating cufve, 97,000 second-feet); minimum stage recorded, 0.99 foot at 8 p. m. October 5 (discharge, 1,070 second-feet). 1904-1920: Maximum stage recorded, 30.7 feet during the night of March 28, 1913, determined by leveling from flood marks (discharge, by extension of rating curve, 108,000 second-feet); minimum stage recorded, 0.3 foot July 21 and 28, 1919 (discharge, by extension of rating curve, 500 second-feet). ICE. The river usually freezes over early in the winter, but the ice is likely to break up at times of sudden rises in stage, and at those times it occasionally forms ice jams at Northampton, 10 miles below the station, causing several feet of back water at the gage. REGULATION. Distribution of flow affected by operation of power plants at Turners Falls and by regulation of Deerfield River (see "Deerfield River at Charlemont, Mass."). The effect of the regulation is shown by low water at the gage on Sun days and Mondays. Storage in Somerset reservoir and First Connecticut Lake has little effect on the monthly discharge as measured at Sunderland. ACCURACY. Stage-discharge relation practically permanent, except when affected by ice. Rating curve well defined between 1,500 and 70,000 second-feet. Chain gage read to half-tenths twice daily; gage heights from water-stage recorder used for stages below 10.00 feet. Daily discharge ascertained by applying rating table to mean daily gage height, with correction for ice during winter. Recerds good except for extremely high stages and for times of ice effect, for which they are fair. Discharge measurements of Connecticut River at Sunderland, Mass., during the years end ing Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. See.-ft. «7. 16 o5.36 5,870 Feb. 18 J. W. Moulton...... « 4. 25 4,920 Feb. 17 .....do...... «6.06 5,250 Apr. 18 Mar. 11 o9.34 11,100 28 9.46 23,400 Aug. 27 3.38 4,820 Stage-discharge relation affected by ice. CONNECTICUT RIVER BASIN. 115 Daily discharge, in second-feet, «jf Connecticut Riwr at Stwwferfemd, Mass., for the years endmg Sept. 30,1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918- 19. 1..... 21,000 27,700 14,000 10,160 10,700 11,000 43,500 18,100 10,700 7,910 2,380 1,620 2..... 17,600 33,800 12,000 ,16,000 8,600 20,100 35,000 20,800 7,180 7,910 1,840 2,020 3..... 14,200 34,600 10,200 19,000 6,400 18,400 28,500 24,100 8,420 7,300 1,180 3,940 4..... 10,900 33,100 8,040 15,000 7,500 18,300 23,200 24,000 10,100 4,120 1,450 7,910 5..... 9,100 26,200 9,380 9,000 7,100 17,000 26,200 28,500 8,690 2,510 2,320 8,040 6..... 10,400 20,300 10,400 10,000 6,700 21,400 16,200 27,700 9,810 2,320 2,940 5,100 7..... 14,700 15,700 9,810 9,600 6,200 22,700 23,200 25,500 6,840 3,580 3,500 2,020 8..... 34,200 15,300 7,060 10,200 6,200 20,100 33,400 24,500 3,330 4,890 3,500 1,960 9..... 33,800 15,000 7,420 9,800 4,800 18,400 35,300 23,800 4,300 4,490 2.510 4,500 10..... 31,500 13,800 8,800 10,200 5,700 24,000 38,000 21,900 7,300 3,850 1,510 8,690 11..... 25,500 9,960 10,400 9,200 8,600 24,500 36.100 21,200 11,000 3,760 1,780 6,950 12..... 19,700 11,800 10,600 7,400 8,000 21,600 41,600 21,200 11,200 3,580 2,650 7,540 13..... 13,600 12,300 8,700 7,800 6,200 19,000 45,500 22,300 10,900 1,780 2,580 11,200 14..... 11,000 11,000 8,700 8,000 5,600 17,200 48,600 20,400 8,040 2,200 2,650 18,300 15..... 11,300 11,500 12,500 8,000 6,300 14,800 46,200 17,900 3,760 3,850 2,870 14,800 16. ... 11,500 10,600 18,400 8,800 4,100 11,700 44,300 15,000 4,500 4,030 2,200 13,000 17..... 9,810 6,840 17,600 8,800 4,800 12,800 44,700 15,700 5,830 3,940 1,230 12,200 18..... 9,960 11,500 15,200 8,800 5,300 14,700 41,600 33,400 5,620 3,850 1,730 9,960 19..... 9,520 18,300 12,600 8,800 7,000 17,400 37,700 32,700 5,410 2,800 3,090 7)180 20..... 6,380 30,400 10,600 7,700 6,200 21,900 33,800 27,700 5,830 1,510 3,170 6,950 21..... 13.000 25,800 8,800 8,20(1 6,200 26,600 30,000 28,100 7.300 1,900 3,250 3,580 22..... 13,800 23,200 8,200 7,70(1 5,300 36,900 27,400 51,300 6,050 3,170 3,090 4,500 23..... 13.600 21,400 17.600 7,20(1 4,400 36,900 24.000 65,700 4,990 5,620 2,800 4,790 24..... 14,300 18,300 24,700 10,20(1 5,800 34.200 23,200 58,900 5,720 5,100 1,960 5,410 25..... 12,300 15,700 33,100 13,50(1 6,300 31,200 21,700 44,700 5,830 3,410 3,940 5,100 26..... 11,300 15, 700 . 36,500 14,800 6,000 28,500 30.400 38,000 5,830 2,380 4,030 5,720 27..... 9,100 12,800 31,500 15,200 5,410 38,800 15,700 30,800 4,400 1,560 3,580 5,300 28. .... 11.000 8,160 23,200 13,000 6,050 73,000 19,900 26,200 3,670 1,780 2,940 3,760 29..... 12,800 12,000 15,000 12,300 78,000 19,000 24,000 2,200 2,720 2,720 5,200 30. .... 12,800 12,300 10,200 12,000 67,800 18,400 19,200 4,400 2,870 2,450 6,490 31..... 15,000 10,100 11,700 55,700 18,400 2,720 2,320 1919- 20 6,380 16,900 27,700 9,500 2,450 2,300 69,800 58,500 11,500 5,720 2,020 4,030 2!! ;; 6,050 23,200 27,000 7,900 3,000 4,800 66,900 52,100 10,900 5,200 3,100 3,760 3.. .. 4,690 30,000 24,300 5,200 5,000 4,800 66,900 47,400 11,000 6,270 5,200 3,670 4.. .. 3,330 30,000 18,800 2,450 4,800 4,600 66,100 43,100 12,000 9,100 6,950 3,410 5.. .. 1,670 28,900 13,000 3,200 4,600 5,200 61,700 40,400 9,660 7,300 6,950 2,200 6..... 6,270 22,800 11,000 5,600 5,400 5,400 66,100 36,100 7,060 7,540 5,940 2,260 7..... 10,100 19,900 9,520 6,500 3,000 5,400 62,100 32.700 11,300 9,380 3,760 4,030 8..... 9,520 17,600 12,600 5,600 1,840 6,700 54,100 31,500 13,800 7,660 2,320 4,790 9-.... 10,400 15,700 13,600 6,000 2,700 9,500 44,700 33,800 13,300 6,950 3,330 5,090 10..... 11,800 14,800 18,800 5,400 5,000 9,800 37,300 30,800 12,500 6,050 4,690 6,270 11..... 8,690 13,100 21,400 3,000 5,200 10,100 35,000 36,100 12,800 3,330 5,830 6,270 12..... 8,960 14,300 17,800 4,600 4,600 8,950 28,100 36,500 10,200 4,890 7,780 4,400 13..... 10,400 20,600 16.700 6,000 4,800 10,100 38,000 32,700 4,210 6,160 7,300 5,200 14..... 12,000 31,200 24,700 6,000 4,400 18,800 72,200 29,600 5,510 6,840 9,520 6,950 15..... 10,400 31,500 20,300 5,800 2,450 24,300 75,900 27,700 6,380 6,720 8,550 7,540 16..... 10,700 28,100 18,100 5,400 2,450 24,300 68,100 '26,600 6,380 6,840 11,200 12,000 17..... 8,420 21,400 17,800 5,200 5,000 24,700 65,300 23,600 9,520 5,410 14,200 9,520 18..... 7,910 19,300 16,000 3,200 4,600 29,300 62,100 20,300 18,100 3,170 12,000 8,820 19..... 8,160 16,200 14,700 5,800 4,400 29,300 57,300 18,300 19,700 5,100 11,800 4,400 20..... 9,520 14,000 12,600 5,600 5,200 27,000 50,100 18,500 10,400 6,380 9,380 4,790 21..... 8,820 13,300 8,200 5,400 4,600 23,200 52,500 19,500 8,290 6,950 6,380 "6,830 22..... 7,540 11,800 7,700 5,000 2,300 19,500 57,700 28,500 9,950 7,540 4,210 9,660 23..... 7,910 11,300 10,400 4,600 2,100 22,100 67,700 33,100 12,000 7,910 3,330 8,030 24..... 10,100 12,600 10,700 5,600 5,200 24,300 73,800 30,400 9,100 7,660 4,690 5,940 25..... 9,100 14,700 8,400 2,700 4,600 33,800 72,600 21,400 8,960 4,210 5,200 4,120 26..... 8,820 16,000 8,400 4.200 4,600 50,100 63,700 22,700 6,720 5,100 4,400 1,840 27..... 8,420 23,600 8,700 5,400 4,400 87,500 55,700 18.800 3,500 6,270 3,940 3,940 28..... 9,660 24,300 5,200 5,200 3,850 89,500 52,500 17,800 4,990 6,160 3,170 6,380 29,.... 11,300 21,000 5,800 5,200 |,100 81,700 64,500 12,300 5,720 5,620 1,780 4,120 30..... 12,800 22,800 8,200 5,200 75,100 63,300 14,000 6,490 5,300 2,510 4,990 31..... 10,700 ...... 8,400 4,800 75,500 10,400 3,670 3,670 ...... NOTE Stage-discharge relation affected by ice Dec. 10-22, 1918, Dec. 28, 1918, to Feb. 26, 1919, and Dec. 17,1919, to Mar. 26,1920. Discharge for these periods based on gage heights corrected for effect of ice by means of discharge measurements, observer's notes, weather records, and comparison with discharge records at other stations on the river. 116 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Connecticut River at Sunderland, Mass., for the years ending Sept. 30, 1919 cmd 1920. [Drainage area, 8,000 square miles.] * Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 34,200 6,380 15,000 1.88 2.17 November...... 34,600 6,840 17,800 2.22 2.48 36,500 7,060 14,200 1.78 2.05 19,000 7,200 10,600 1.32 1.52 10,700 4,100 6,300 .788 .82 March ...... 78,000 11,000 28,200 3.52 4.06 April...... 48,600 15,700 31,700 3.96 4.42 May...... 65,700 15,000 28,100 3.51 4.05 11,400 2,200 6,640 .830 .93 July...... 7910 1,510 3,660 .458 .53 4,030 1,180 2,580 .322 .37 September...... 18,300 , 1,620 6,790 .849 .95 The year...... 78,000 1,180 14,400 1.80 24.35 1919-20. 12,800 1,670 8,730 1.09 1.26 N ovember ...... 31,500 11,300 20,000 2.50 2.79 27,700 5,200 14,400 1.80 2.08 9,500 2,450 5,200 .650 .75 5,400 1,840 3,950 .494 .53 March...... 89,500 2,300 27.400 3.42 3.94 April...... 75,900 28,100 59,100 7.39 8.24 58,500 10,400 29,200 3.65 4.21 19,700 3,500 9,73a 1.22 1.36 July...... 9,380 3,170 6,210 .776 .89 14,200 1,780 5,970 .746 .86 12,000 1,840 5,510 .688 .77 The year ...... 89,500 1,670 16,300 2.04 27.68 PASSTTMPSIC RIVER AT PIERCE'S HILLS, NEAR ST. JOHNSBTTRY, VT. LOCATION. At suspension footbridge just below Pierce's mills, 2 miles below mouth of Sheldon Branch, 4 miles above mouth of Moose River, and 5 miles north of St. Johnsbury, Caledonia County. DRAINAGE AREA. 237 square miles. RECORDS AVAILABLE. May 26,1909, to July 24,1919, when station was discontinued. GAGE. Staff in two sections; low-water section, a vertical staff bolted to ledge just above bridge; high-water section, an inclined staff bolted to ledge below bridge; read by W. I. Cox, and Clinton G. Taylor. DISCHARGE MEASUREMENTS. Made from foot bridge or by wading below the bridge. CHANNEL AND CONTROL. Channel composed of ledge rock partly covered with gravel and alluvial deposits. At high stages the control is probably at the dam near Centervale. EXTREMES OP DISCHARGE. Maximum stage recorded during year, 9.4 feet at noon October 31 (discharge, by extension of rating curve, 4,320 second-feet); minimum stage recorded, 0.95 feet at 6.30 a. m. July 19 (discharge, 35 second-feet). 1909-1919: Maximum stage recorded, 14.8 feet during the night of March 27, 1913, determined by leveling from flood marks (discharge not computed); mini mum stage recorded, zero flow at different times owing to water being held back by mills. ICE. River freezes over at the, control, causing*the stage-discharge relation to be seriously affected; ice jams occasionally form below the gage. RIVER BASIN. REGULATION. There is a small diurnal fluctuation caused by the operation of Pierce's mills, just above the station, and by other mills farther upstream. The effect of the diurnal fluctuation was studied by means of a portable automatic gage from August 16 to September 11, 1914. Although the results obtained from twice- a-day gage heights were fo^und to be occasionally in error for individual days, yet the mean discharge for t|he period as determined from twice-a-day gage heights and from hourly readings were found to be identical. ACCURACY. The stage-discharge relation has remained practically permanent, except when affected by icet Rating curve fairly well defined below 2,000 second- feet. Gage read to quarter-tenths twice daily. Daily discharge ascertained by applying rating table to njiean daily gage height, with correction for effect of ice during the winter. Records good. Discharge measurements of Passit,mpsic River at Pierce's mills, near St. Johnsbury, Vt., during the year ending Sept. SO, 1919. » Dis I ate. Made by a*. charge. Feet. Sec.-ft. 18 o2.34 281 Fel 22 "2.04 185 Tin P 22 R.H. Suttie...... 1.73 190 Stage-discharge relation affected by ice. DC ily discharge, in second-feet, of Passumpsic River at Pierce's mills, near St. Johnsbury, Vt., fo>r the year ending Sept. SO, 1919. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. 1 360 1,560 420 560 260 560 530 710 230 164 2 320 1,040 420 670 230 800 460 910 216 164 3 375 870 460 710 180 660 530 790 230 141 4 360 670 420 560 230 520 670 750 202 141 5 360 750 390 530 200 520 870 1,000 202 130 6 2,600 710 360 500 210 540 950 830 176 120 7 1,880 670 3ftft 220 370 1 460 670 360 141 8 910 600 340 460 210 260 I'eio 710 320 128 9 640 640 320 410 195 280 1,170 600 260 117 ) 530 640 320 390 185 680 1,120 500 290 111 11 500 670 320 ict; 660 1,610 500 245 111 1? 460 670 320 360 185 500 2,860 460 202 109 13 420 600 360 370 185 410 1,710 460 189 109 14 560 530 420 360 180 405 1,460 405 164 97 15 500 460 1,040 300 170 360 1,080 360 245 68 16 420 460 710 310 150 340 1,080 390 320 141 17 375 460 420 300 165 360 1,510 530 910 109 IS 870 son 280 460 1,410 1,260 69 19 600 640 320 280 165 530 1,080 750 275 35 20 600 530 305 280 170 750 910 530 260 89 21 1,120 710 290 260 190 1,510 1,000 460 202 61 W, 670 640 390 250 180 1,510 910 530 176 99 23 530 530 1,310 300 750 830 1,000 176 141 ?4 460 500 1,000 1,100 200 750 790 640 164 68 25 460 460 750 830 710 790 530 164 26 790 390 640 560 220 750 500 152 W 830 390 460 500 220 830 710 420 460 2R 600 360 OQfl 460 220 2,420 670 360 460 W 530 460 375 380 1,760 1,000 360 216 30 2,300 750 375 380 1,410 870 305 176 31 3,770 420 290 750 260 ] DTE. Stage-discharge relation affected by ice Jan. 7-23 and Jan. 31 to Mar. 12; daily discharge during this period based on gage heights corrected for effect of ice by means of two discharge measurements, obs Monthly discharge of Passumpsic River at Pierce's mills, near St. Johnsbury, Vt.,for the year ending Sept. 30, 1919. [Drainage area, 237 square miles.] Discharge in second-feet. \ Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 3.770 320 829 3.50 4.04 1,560 360 649 2.74 3.06 1,310 290 478 2.fl2 2.33 1,100 250 445 1.88 2.17 280 150 196 .827 .86 March ...... 2,420 260 746 3.15 3.63 2,860 460 1,080 4.56 5.09 May...... 1,260 260 596 2.51 2.89 910 152 269 1.14 1.27 July 1-24...... 164 35 111 .469 .42 « WHITE RIVER AT WEST HARTFORD, VT. LOCATION. About 500 feet above highway bridge m West Hartford, Windsor County, 7 miles above mouth of river. DRAINAGE AREA. 687 square miles. RECORDS AVAILABLE. June 9, 1915, to September 30, 1920. GAGE. Inclined staff on left bank; read by F. P. Morse. DISCHARGE MEASUREMENTS. Made from cable 1,500 feet below the gage or by wading. CHANNEL AND CONTROL. Channel wide and of fairly uniform cross-section at measur ing section; covered with gravel and small boulders. Control formed by rock ledge 100 feet below the gage; well denned. EXTREMES OP DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 15.0 feet at 6 p. m. March 28 (discharge, by extension of rating curve, 20,500 second-feet); minimum stage recorded, 2.62 feet at 7 a. m. August 18 (dis charge, by extension of rating curve, 94 second-feet). Maximum open-water stage for the year ending September 30, 1920, 12.1 feet at 6 p. m. April 13, (discharge, by extension of rating curve, 16,400 second-feet); (a gage height of 12.2 feet was recorded at 7 a. m. March 26, but the channel was obstructed by ice); minimum stage recorded, 2.68 feet at 10 a. m. September 6 (discharge, by extension of rating curve, 106 second-feet). 1915-1920: Maximum stage recorded, 15.0 feet at 6 p. m. March 28, 1919 (dis charge, by extension of rating curve, 20,500 second-feet); minimum stage re corded, 2.33 feet at 6 a. m. August 29, 1916 (discharge, by extension of rating curve, 26 second-feet). The high water of March 27, 1913, reached a stage of 18.9 feet, as determined from reference point on scale platform opposite gage (discharge not determined). ICE. River freezes over at the gage; control usually remains partly open, although ice on the rocks and along the shore affects the stage-discharge relation. REGULATION. There are several power plants on the main stream and tributaries above the station, the nearest being that of the Vermont Copper Co. at Sh.aron; when this plant is in operation it causes sjome diurnal fluctuation in discharge at low stages. The effect of power plants farther upstream is eliminated by the large amount of pondage at Sharon. CONNECTICUT RIVER BASIN. 119 ACCURACY. Stage-discharge relation practically permanent, except when affected by ice. Bating curve_ well defined between 150 and 5,000 second-feet. Staff gage read to quarter-tenths twice daily. Daily discharge ascertained by applying rating table to mean daily gage height, with correction for effect of ice during winter. Records good. Discharge measurements of White River at West Hartford, Ft., during the years ending Sept. SO, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by & charge. 1918. Feet. Sec.-ft. 1919. feet. Sec.-ft. Get. 29 4.32 847 B. L. Bigwood...... 2.84 139 Nov. 5 Nov. 22 H.S. Price...... 4.57 1,050 1919...... do...... 5.18 1,500 1920. Jan. 22 H. W. Fear...... «4.26 729 .....do...... «4.01 283 Mar. 4 a 4 Oft 1,230 Feb. 18 .....do...... « 4. 15 997 4.20 734 Sept. 14 M. R. Stackpole...... 3.96 584 a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of White River at West Hartford, Vt.,for the years ending Sept. 30, 1919 and 1920. Day. ' Cct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1,040 2,840 1,460 1,200 560 960 2,840 1,370 1,280 395 126 215 ^,...... 855 1,970 890 2,320 820 2,800 2,320 2,200 1,120 345 140 247 3...... 925 1,550 1,370 1,860 580 1,550 2,200 1,970 1,040 305 126 215 4...... 1,200 1,370 1,280 1,650 600 1,200 2,320 1,650 960 265 110 175 5...... 960 1,550 1,200 890 600 1,950 2,440 1,750 820 230 132 230 6...... 2,570 1,460 890 960 600 3,100 2,700 1,750 750 230 155 175 7...... 2,840 1,370 890 1,040 540 1,500 4,000 1,550 820 247 187 146 8...... 1,650 1,200 960 1,370 520 1,450 4,540 1,750 890 265 172 114 Q 1,370 1,200 1,200 i v?n 480 1,370 3,640 1,460 820 230 162 820 10...... 1,120 1,120 960 1,040 440 2,440 3,300 1,370 1,370 200 175 717 11...... i fun 1,120 652 980 330 1,860 3,300 1,370 925 200 140 472 12...... 890 960 855 740 270 1,460 8,950 1,460 717 265 152 890 13...... 820 925 1,040 770 320 1,750 4,540 1,280 620 230 126 4,000 14...... 960 890 1,040 960 420 1,200 3,640 1,120 590 215 138 1,370 15...... 785 890 1,550 1,150 400 1,200 2,840 1,040 620 200 132 890 16...... 717 820 2,200 920 400 1,200 2,570 960 620 187 146 717 17...... 685 820 1,550 920 480 1,040 3,140 1,200 750 187 142 620 18...... 750 1,370 1,200 880 340 1,200 3,470 3,820 750 200 106 500 19...... 785 7,100 925 800 310 1,970 2,990 3,640 560 187 150 420 20...... 717 4,000 925 780 290 1,970 2,440 1,750 620 170 160 370 21...... 1,200 2,700 1,040 720 340 3,640 2,320 1,460 685 155 175 325 22...... 1,120 2,080 1,040 700 310 4,000 2,200 4,540 500 187 162 325 23...... 890 1,750 4,360 680 330 2,440 1,970 7,500 445 265 146 472 24...... 820 1,650 2,840 1,700 420 2,440 1,860 5,300 395 247. 160 530 25...... 750 1,460 3,470 1,500 370 2,320 1,970 3,300 370. 200 134 685 26...... 750 1,370 2,840 980 420 2,320 1,650 2,700 345 175 175 652 27...... 1,040 1,280 2,080 1,000 370 2,700 1,550 2,570 472 160 155 560 28...... 925 1,200 1,650 820 340 16,100 1 460 2,200 1,040 150 165 420 29...... 820 1,750 1,370 720 8,320 1,650 1,860 560 170 155 420 30...... 960 1,860 1,200 700 4,730 1,550 1,650 472 160 155 370 31...... 5,110 1,040 720 3,640 1,370 155 187 ...... 120 STJBFACE WA!EEE SUPPLY, 1919-1920, PAST I. Daily discharge, in second-feet, of White River at West Hartford, Vt.,for ike years ending Sept. 30,1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 305 2,080 2,700 340 130 200 4,180 4,000 750 620 265 155 2...... 285 2,200 1,970 300 175 175 5,300 3,300 590 500 265 175 560 1,750 1370 300 180 200 5,300 2,990 560 925 230 170 4...... 590 1,370 1,200 270 150 200 4,730 2,990 530 1,370 200 155 5...... 500 1,550 1,280 250 150 200 4,540 2,570 560 1,200 200 155 6...... 685 1,550 1,370 270 200 260 4,180 2,440 960 960 175 110 7,.vJ...... 1,460 1,460 1,200 270 175 620 4,730 2,570 1,040 717 170 138 ft . . - ,:. 890 1,870 1,870 270 200 620 2,990 2,700 855 685 138 175 !::::::;::::::: 717 1,280 1,280 270 210 500 2,440 2,990 750 750 148 187 10...... 750 1,280 2,700 280 210 400 2,320 2,440 652 652 173 175 it;...;.,...... 785 1,200 1,550 270 175 350 2,440 1,970 530 500 173 230 i.....,.:...... 685 1,750 1,550 270 250 400 2,840 1,970 530 472 420 230 8 :...... 620 4,180 1,750 inft 210 2,100 8,740 1,750 652 652 395 560 14...... 560 2,840 2,840 220 210 4,700 10,400 1,550 445 590 370 590 15...... 530 2,080 1,860 200 200 2,300 6,700 1,750 370 590 345 395 16...... 590 1,550 1,280 200 1,550 8,320 1,460 530 560 500 230 17...... 1,370 1,460 1,120 200 160 8,000 6,700 1,370 560 445 370 200 18...... 1,040 1,370 890 200 250 3,600 5,500 1,280 620 370 230 230 19...... 820 1,280 820 160 280 1,950 4,730 890 345 215 230 20...... 750 1,200 785 175 260 1,550 4,730 l'l20 685 785 200 187 21...... 685 960 750 185 250 1,300 4,920 1,280 717 620 175 170 22 1,120 1,200 717 150 250 1,200 11,500 2,990 960 395 230 150 23...... 1,120 1,750 685 175 260- 1,350 9,160 1,970 750 370 134 160 24...... 925 1,550 685 200 260 5,300 9,160 1,550 590 345 175 175 25...... 820 1,280 620 175 260 10,000 5,900 1,460 472 305 165 155 26...... 750 1,280 560 160 250 9,600 4,360 1,280 345 325 162 130 27...... 1,120 1,460 590 175 230 7,900 3,640 1,120 370 285 150 136 28...... 1 200 1,280 560 200 200 7,300 5,900 960 305 230 128 146 29...... l'650 1,120 470 140 200 6,700 6,100 890 395 215 134 155 30...... 1,200 3,300 vjn 185 6,100 4,920 750 500 230 126 230 31...... 1 ' 370 370 140 5 110 750 215 160 NOTE. Stagfr-discharge relation affected by ice Jan. 11 to Mar. 8,1919, and Dec. 20,1919, to Mar. 28,1920; discharge for these periods based on gage heights corrected for effect of ice by means of discharge measure ments, observer's notes, and weather records. Monthly discharge of White River at West Hartford, Vt., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 687 square miles.] Discharge in second-fee^. Month. Per Run-off in Maximum. Mfnimmn- Mean. square inches. mile. 1918-19. 5,110 685 1,200 1.75 2.02 7,100 820 1,720 2.50 2.79 December...... 4,360 652 1,480 2.15 2.48 January...... 2,320 680 1,060 1.54 1.78 820 270 436 .635 .66 March...... 16,100 960 2,770 4.03 4.65 April...... 8,950 1,460 2,880 4.19 4.68 l&y...T*£»Tf ...... 5,300 960 2,220 3.23 3.72 1,370 345 731 1.06 1.18 July...... 395 150 218 .317 .37 187 106 150 .218 .25 September...... 4,000 114 602 .876 .98 The year ...... ie,ioo 106 1,290 1.88 25.56 1919-20. October...... 1,650 v 285 854 1.24 1.43 4,180 960 1,670 2.43 2.71 December ...... 2,840 370 1,200 1.75 2.02 January ...... 340 140 222 .323 .37 February ...... 280 130 212 .309 .33 March...... 10,000 175 2,800 4.08 4.70 April...... 11.500 2,320 5,580 8.12 9.06 &jj>v 4,000 750 1,920 2.79 3.22 1,040 305 615 .895 1.00 July...... 1,370 215 556 .809 .93 August .... 500 126 223 .325 .37 590 110 203 .295 .33 11,500 110 1,340 1.95 26.47 CONNECTICUT BIVEE BASIN. WEST BIVER AT NEWFAJTE, VT. LOCATION. At covered highway bridge 1$ miles northeast of Newfane, Windham County. DRAINAGE ABE A. 310 square miles. RECORDS AVAILABLE. September 13, 1919, to September 30, 1920. GAGE. Chain on downstream side of highway bridge. DISCHARGE MEASUREMENTS. Made from highway bridge or by wading. CHANNEL AND CONTROL. Gravel and ledge; well-defined riffle just above island 800 feet below gage; probably permanent. EXTREMES OF DISCHARGE. Maximum stage recorded during year, 11.75 feet at 6.10 p. m. April 13, 1920 (discharge not determined); minimum stage recorded, 3.69 feet on morning and afternoon of September 27, 1920 (discharge, 53 second-feet). ICE. River freezes over and stage-discharge relation seriously affected. REGULATION. A few small mills above the station do not seriously affect the distri bution of flow. ACCURACY. Stage-discharge relation permanent except when affected by ice. Rating curve fairly well defined between 70 and 2,000 second-feet. Gage read to half-tenths twice daily except from December 24 to March 25, when it was read once a day. Daily discharge ascertained by applying rating table to mean daily gage height, with correction for effect of ice during winter. Records good. Discharge measurements of West River at Newfane, Vt., during the years ending Sept. SO, 1919 and 1920. Dis Gage Dis Bate. Made by height. charge. Date. Made by height. charge. 1919. feet. Sec.-ft. 1920. Feet. Sec.-ft. 5.66 1 *651360 Apr. 7 H.S, Price...... 6.10 1,790 14 4.85 A iitr 9.4. 3.81 77 1920. Jan. 12 H.S. Price...... 04.91 250 a Stage-discharge relation affected by ice. 122 SURFACE WATER SUPPLY, 1919--1920, PART I. Daily discharge, in second-feet, of West River at N&wfane, Vt., for the perwd Sept. 13, 1919, to Sept. SO, 1920. Day. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 109 1,890 1,580 240 115 65 2,560 1,530 166 124 97 115 2...... 109 1,680 968 250 130 65 3,130 1,310 174 124 134 95 3...... 162 1,310 678 220 115 65 2,920 1,190 166 124 103 87 174 907 620 260 150 65 2,400 1,310 142 130 85 80 5...... 154 1,310 660 260 150 75 2,770 1,130 174 115 73 69 6...... 146 1.260 700 240 130 170 3,030 933 1,030 106 69 57 7...... 420 933 740 320 130 350 1,890 882 602 115 69 73 8...... 255 831 660 220 130 660 1,350 1,010 427 100 69 73 9...... 197 754 780 230 130 700 1,080 1,580 323 95 63 73 10...... 309 652 1,630 230 115 660 995 l'l90 245 100 63 92 11...... 413 627 1,040 290 100 490 1,080 9J8 174 95 303 303 12...... 309 986 865 280 100 450 1,140 797 174 100 392 166 13...... 1.580 225 1,790 865 230 100 1,050 4,580 754 166 130 298 220 14...... 618 197 1,490 1,890 240 115 3,600 3,750 729 134 138 635 250 15...... 320 179 907 1,170 220 150 2,800 2,300 695 142 134 594 158 16...... 281 188 678 84S 190 130 2,500 3,030 583 162 166 298 103 17...... 220 1.030 578, 680 190 100 2,500 2,720 546 240 121 215 . 112 18...... 170 546 538 460 190 100 2,900 2,240 538 1.400 103 183 85 19...... 150 372 515 380 170 100 2,400 2,140 522 968 148 142 85 20...... 142 320 492 380 170 100 2,000 2,240 554 515 538 109 77 21...... 124 265 515 370 150 85 1,600 2,430 977 470 220 100 77 22...... 118 515 485 370 150 100 1,300 3,540 1,350 627 121 90 69 23...... 441 586 578 330 150 100 1,300 3,130 890 420 121 82 63 24...... 372 359 530 420 150 100 2,100 3,540 720 235 166 80 69 25...... 309 298 427 320 130 85 3,000 2,190 618 203 174 75 63 26...... 250 265 882 290 115 85 3,440 1,680 538 179 121 75 63 27...... 215 610 1,680 320 115 75 4,160 1,530 427 150 97 71 53 28...... 179 712 1,080 350 115 65 3,650 3,340 339 138 97 75 67 29...... 130 916 763 290 100 65 2,920 2,820 270 130 92 65 61 30...... 121 570 2,400 260 115 2,920 1,990 183 138 92 59 118 31...... 1,020 230 115 174 92 75 NOTE. Stage-discharge relation affected by ice Dec. 4-9 and Dec. 17 to Mar. 25; discharge for these periods based on gage heights corrected for effect of ice by means of one discharge measurement, observer's notes, weather records, and comparison with records for White River at West Hartford, Vt. Monthly discharge of West River at-Newfane, Vt.,for the year ending Sept. 30, 1920. [Drainage area, 310 square miles.] Discharge in second-feet. Run-off in Month. Per inches. Maximum . Minimum. Mean. square mile. October ...... ,...... *...... 1,030 109 385 1.24 1.43 2,400 427 982 3.17 3.54 1,890 260 683 2.20 2.54 320 100 197 .636 .73 150 65 109 .352 .38 March ...... 4,160 65 1,700 5.48 6.32 April...... 4,580 995 2,450 7.90 8.81 May...... 1,580 174 814 2,62 3.02 1,400 130 . 342 1.10 1.23 July...... 538 92 135 .435 .50 635 59 15S .503 .58 S ept ember ...... 303 53 103 .332 .37 The year...... __ ...... 4,580 53 672 2.17 29.45 ; comffI&nO!FF* BIVBR WASH*. 123 A3HT7ELOT RIVER AT HOTSDALE, N. H. LOCATION. At lower steel highway bridge a quarter of a mile below dam of Fisk Paper Co., 1£ miles above mouth of river. DRAINAGE ABBA. 440 square miles. RECORDS AVAILABLE. February 22, 1907, to December 31, 1909, and July 11, 1914, to September 30, 1920. GAGE. Chain gage on downstream side of bridge; read by Teresa Golden. DISCHARGE MEASUREMENTS. Made from highway bridge. CHANNEL AND CONTROL. Channel covered with coarse gravel and boulders. Con trol is a short distance below the gage and is practically permanent. EXTREMES OP DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 6.92 feet at 8 a. m. May 24 (discharge, by extension of rating curve, 4,330 second-feet); minimum stage recorded, 2.18 feet at 4 p. m. June 15 (dis charge, by extension of rating curve, 20 second-feet). Maximum stage recorded for the year ending September 30, 1920, 9.98 feet at 4 p. m. March 29 (discharge, by extension of rating curve, 8,940 second-feet); minimum stage recorded, 2.25 feet at 4 p. m. October 16 (discharge, 26 second- feet). 1914-1920: Maximum stage recorded, 9.98 feet March 29, 1920 (discharge, by extension of rating curve, 8,940 second-feet); minimum stage recorded, 2.0 feet at 4 p. m. October 4, 1914 (discharge, by extension of rating curve, 10 second- feet). ICE. Ice forms below bridge on control, affecting stage-discharge relation for short periods. REGULATION. The mills immediately above station are operated continuously except Sundays and holidays, but cause little fluctuation m stage. Several reservoirs and ponds on the river and tributaries have some effect on the distribution of flow. The effect of p*bwer regulation was studied by a temporary installation of water-stage recorder during July and August, 1917. ACCURACY. Stage-discharge relation practically permanent except when affected by ice. Rating curve fairly well defined below 4,000 second-feet. Gage read to hundredths twice daily. Discharge ascertained by applying rating table to mean daily gage height, with correction for effect of ice during the winter. Records good. Discharge measurements of Ashuelot River at Hinsdale, N. H., during the years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft Jan. 27 M. R. Stackpole...... 4.08 761 3.44 351 June 6 .....do...... 3.47 324 124 SURFACE WATER SUPPLY, IM^-1930, PAET 1. Daily discharge, in second-feet, of Ashuelot River at HinsdaU, N. H., for the years ending Sept. SO, 1919 and 1920. / Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... don 215 xn fi NOTE. Stage-discharge relation affected by ice Jan. 10-25,1919, and Dec. 18,1919, to Mar. 10,1920; dis charge for these periods based on gage heights, corrected for effect of ice. CONNECTICUT RIVER BASIN. 125 Monthly discharge of Ashuelot River at Hinsdale, N. H., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 440 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 555 176 329 0.748 0.86 1,550 54 443 1.01 1.13 December...... 2,300 264 787 1.79 2.06 1,320 215 592 1.35 1.56 February...... 490 145 304 .691 .72 4,150 695 1,490 3.39 3/91 April...... 2,040 520 1,230 2.80 3.12 May...... 4,300 555 1,500 3.41 3.93 950 51 296 .673 .75 July...... 194 45 136 .309 .36 200 42 115 .262 .30 September...... 400 137 257 .584 .65 The year...... 4,300 42 627 1.42 19.35 1919-20. 555 32 164 0.373 0.43 2,440 185 849 1.93 2.15 r> MOTNEWAWA BROOK AT MARLBORO, N. H. LOCATION. In Marlboro, Cheshire County, 300 feet from Marlboro-Keene town, line and 1 mile above confluence with east branch of Ashuelot River. DRAINAGE AREA. 31.7 square miles. RECORDS AVAILABLE. July 25, 1919, to September 30, 1920. GAGE. Gurley 7-day water-stage recorder on left bank, referenced to gage datum by a hook gage inside the well; an inclined staff is used for auxiliary readings. Recorder inspected by Edwin S. L'Heureux. DISCHARGE MEASUREMENTS. Made by wading or from highway bridge 500 feet above gage. CHANNEL AND CONTROL. Channel rough, with steep slope; control somewhat shifting. EXTREMES OP DISCHARGE. Maximum open-water stage during the period July 25, 1919, to September 30, 1920, from water-stage recorder, 6.09 feet at 4 p. m. March 27 (discharge, by extension of rating curve, 560 second-feet); a stage oi 8.3 feet was recorded March 14, but the channel was obstructed by ice; discharge practically zero at various times when water was held back by dams. ICE . Ice forms on rocks and at the control; channel fills with slush ice, and occasional ice gorges occur; stage-discharge relation seriously affected. REGtrLATioN. Flow at ordinary stages is under complete regulation by power plants in Marlboro; several small reservoirs also affect the distribution of flow. ACCURACY. Stage-discharge relation apparently changed during high water of March, 1920; two rating curves used during the year, both fairly well defined between 8 and 340 second-feet. Operation of water-stage recorder satisfactory. Daily discharge ascertained by applying rating table to mean daily gage height, with correction for ice effect during the winter. Records fair. 126 SURFACE WATER SUPPLY, 1919^-1920, PART I. Discharge measurements of Minnewawa Brook at Marlboro, N. H., during the years ending Sept. SO, 1919 and 1920. Dis Dis Date. Gage Gage Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. July 15 M. R. Stackpole...... 3.35 51 o5.90 41.1 15 .....do...... 3.35 Kl Feb. 19 .....do...... o3.72 28.7 16 .....do...... 2 QO 19 3 H. S. Price...... 5.02 325 17 .....do...... 2.90 30 .....do...... 5.02 319 17 .....do...... 2 GO 15.0 31 .....do...... 4.84 300 25 .....do...... 3.31 45 0 July 9 3.32 40 g 3.31 39 Nov. 6 .....do...... 3.43 Cfi Aug. 23 3.24 28 6 .....do...... 3.45 58 23 .....do...... 2.83 7.6 a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Minnewawa Brook at Marlboro, N. H., for (he years ending Sept. 30, 1919 and 1920. Day. Jul;?. AujI. Sept. Day. July. Aug. Sept ]Day. July. Aug. Sept. 1919. 1919. 1919. 1...... 16 6 .2 11 12 30 21. 26 2...... 22 12 . 18 39 22. 20 13 3...... 6. 8 57 13 16 30 23. 15 26 4...... 16 « 14 9. 1 24. 10 25 5...... 20 31 15 . 12 12 25. 26 29 12 6...... 17 26 16 . 11 12 26. 16 25 23 7...... 14 9.1 17 6.6 12 27 7.7 20 16 8...... 15 28 18 9 1 10 28 14 22 7.3 9...... 12 33 19 14 10 29. 18 19 18 10...... 7. 7 28 9.1 3 30. 14 15 22 31. 14 8.4 Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June July. Aug. Sept. 1919-20 1...... 21 27 140 248 162 36 26 26 22 2...... 20 49 106 1 256 135 37 15 33 18 3...... 21 45 91 250 117 34 12 25 22 4...... 18 39 83 248 122 30 6 9 23 16 5...... 7.7 45 83 240 117 31 6.6 22 11 6...... 22 54 81 300 103 48 21 25 8.3 7...... 24 49 67 204 85 60 26 22 20 8...... 24 39 86 144 92 54 25 22 19 9...... 22 41 103 122 141 44 25 31 19 10...... 20 46 147 125 110 127 33 26 22 26 11...... 10 44 147 Q7 94 24 19 40 19 12...... 5.9 53 98 104 80 31 28 33 15 13...... 5.7 82 97 322 74 25 27 46 38 14...... 18 76 118 463 74 28 27 92 ,31 15...... 20 52 114 19 254 76 31 27 45 29 16...... 15 44 24 210 58 34 24 44 27 17...... 22 46 200 60 43 17 39 28 18...... 17 45 171 58 83 10 144 21 19...... 9.5 44 155 54 89 50 61 11 20 22 38 218 48 50 41 48 23 21...... 22 37 230 180 60 52 29 20 23 22 31 31 220 258 100 54 29 16 21 23 39 42 50 220 300 107 52 23 15 21 24...... 37 44 242 351 94 45 18 16 23 25...... 24 41 224 234 74 35 11 12 22 26...... 7.1 75 375 160 64 20 22 11 1C 27...... 16 245 501 140 56 14 20 10 21 28 22 152 437 338 50 25 20 7.3 22 29 26 126 342 362 33 27 18 8.3 22 30...... 22 164 340 226 27 27 18 13 97 31...... 2800 J 286 26 16 19 NOTE. Stage-discharge relation affected by ice Dec. 16,1919, to Mar. 20,1920; discharge for this period estimated from gage heights, discharge measurements, weather records, and comparison with records in other drainage basins. Braced figures show mean discharge for periods included. CONNECTICUT RIVER BASIN. Monthly discharge of Minnewawa Brook at Marlboro, N. H.,for the years ending Sept. SO* 1919 and 1920. [Drainage area, 31.7 square miles.] Discharge in second-feet. Run-off Month. In Per inches. Maximum. Minimum. Mean. square mile. 1919. July 25-31...... 26 7.7 15.7 0.495 0.13 29 6.6 15.1 .476 .55 September...... 57 6.2 20.9 .659 .74 1919-20. October...... 39 5.9 20.0 .631 .73 245 27 63.8 2.01 2.24 147 76.1 2.40 2.77 January...... 24.0 .757 .87 19.0 .600 .65 501 194 6.12 7.06 April...... 351 97 227 7. K 7.99 May..J...... 162 26 82.9 2.62 3.02 89 14 39.9 1.26 1.41 July...... 50 6.6 22.0 .694 .80 August ...... 144 7.3 32.0 1.01 1.16 97 8.3 23.5 .741 .83 501 68.7 2.17 29.53 PRATT BROOK AT CHESHAM, N. H. LOCATION. At ruins of old dam just below highway bridge on Marlboro-Chetsham road, one-fourth mile above confluence with Minnewawa Brook and half a mile from Chesham railroad station in Harrisville Township, Cheshire County. DRAINAGE AREA. 11.2 square miles (measured on topographic map). RECORDS AVAILABLE. July 8,1919, to September 30,1920. GAGE. Inclined staff near right end of old dam; read by E. G. Russell. DISCHARGE MEASUREMENTS. Made by wading 75 teet above gage or from highway bridge. CHANNEL AND CONTROL. Formed by mud sill of old dam and by ledge rock. EXTREMES OF DISCHARGE. Maximum stage recorded during the period July 8,1919, to September 30, 1920, 5.7 feet at 7 a. m. April 14 (discharge, by extension of rating curve, 545 second feet); minimum stage recorded during period, 1.34 feet several times during September, 1919 (discharge, by extension of rating curve, 1.1 second-feet). ICE. Ice forms on rocks below the gage but is cleared away by observer so that stage- discharge relation is not seriously affected. REGULATION. Flow regulated by storage in Ho we reservoir; gates changed at infre quent intervals. ACCURACY. Stage-discharge relation practically permanent. Rating curve well defined by discharge measurements between 2 and 20 second-feet and at 154 second-feet; curve between 20 and 150 second-feet and above 160 second-feet based on logarithmic extension. Gage read to hundredths twice daily except from February 14 to March 25, when it was read once a day. Daily discharge ascertained by applying rating table to mean daily gage height. Records good. 128 SURFACE WATER SUPPLY, 19a9^192Q, PART I. Discharge measurements of Pratt Brook at Chesham, N. H., during the years ending Sept. SO, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by height charge. 1919. Fed. Sec.-ft. 1920. Feet. Sec.-ft. July 8 1.59 2.6 Jan. 15 M. R. Stackpole...... 2.05 9.1 12 1.68 3 7 Mar. 30 4.01 154 16 1 7ft 4.3 30 .....do...... 4.02 154 Nov. 6 .....do...... 2.09 10.1 July 9 2.20 14 6 .....do...... 9 no 10.4 Aug. 23 1.62 3.4 Daily discharge, in second-feet, of Pratt Brook at Chesham, N. H., for the years ending Sept. SO, 1919 and 1920. Day. July. Aug. Sept. Day. July. Aug. Sept. Day. July. Aug. Sept. 1919. 1919. 1919. 1...... :... 2. 1 4.1 11 4.5 1.5 9.3 21...... 2.2 5.3 1.2 2...... i. 8 7.0 12 3.5 1.5 9.6 22...... 1.9 3.5 1.2 3...... 2. 0 9. 1 13 2.5 1.4 8.6 23...... 3.9 2.3 1.3 4...... 2. 0 8.4 14 2.1 1.3 1. 8 24...... 10.0 4.0 1.2 5...... 1. 9 8.9 15 1.9 1.2 1. 4 25...... 5.6 8.2 5.2 6...... 1. 9 9.3 16 3.5 1.2 1. 4 26...... 2.7 7.0 7.0 5 8.9 17 4.0 1.4 1. 3 27...... ^ n 7.0 7.0 8...... 2.5 1. 5 8.7 18 o a 1 1 98. . . . . 2.7 4.8 7.3 9...... 2.1 1. 4 9.6 19 . 2.3 5.2 1.2 29...... 2.3 3.5 7.2 10...... 2.6 1. 6 9.3 20 . 3.0 7.2 1.1 30...... 2.3 2.5 7.2 31...... 2.2 2.6 Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 7.2 9.1 57 6.7 9.0 7.9 85 64 15 8.6 11 8.0 2...... 7.2 11 32 6.3 8.7 7.9 83 51 15 8.7 10 7.7 3...... 7.0 9.3 22 7.0 8.7 7.6 78 48 13 9.1 10 7.8 4...... 7.0 9.1 15 6.4 8.9 7.5 78 48 12 8.7 10 7.7 5...... 7.0 12 13 6.1 9.0 7.5 74 48 13 8.9 10 7.7 6...... 7.3 9.6 12 6.4 10.0 10 126 44 32 14 9.8 7.8 7...... 6.9 10 12 6.1 9.6 8.4 78 38 31 15 9.8 7.9 8...... 6.7 7.9 12 9.7 9.3 8.7 ,51 34 23 14 9.6 7.6 9...... 6.7 7.9 15 9.7 9.3 8.2 44 64 18 14 9.6 7.8 10...... 7.3 7.9 40 9.7 9.1 8.2 36 54 14 13 9.5 9.5 11...... 6.7 7.9 44 9.3 9.1 8.4 36 44 11 13 12 8.0 12...... 6.6 8.2 25 9.3 9.1 10 34 36 14 13 10 8.2 13...... 6.4 8.9 23 9.5 9.1 21 132 30 13 12 9.8 8.6 14...... 6.4 7.6 32 9.5 9.1 13 404 28 11 12 13 8.4 15...... 6.6 7.3 32 9.3 9.0 10 93 30 11 12 12 8.4 16...... 6.7 6.7 20 9.1 9.1 54 81 29 10 12 12 8,6 17...... 6.7 6.7 14 9.1 9.1 74 83 26 12 12 12 7.9 18...... 6.4 6.7 10 8.9 9.0 74 74 22 35 12 24 8.2 19...... 6.4 6.7 18 9.1 9.1 62 66 21 46 20 14 8.2 20...... 8.2 6.7 7.5 8.7 8.9 51 62 19 30 13 13 8.2 21...... 17 6.7 7.0 8.9 8.7 39 72 22 24 12 4.3 8.2 22...... 32 6.6 7.0 8.4 9.1 34 129 42 26 12 3.5 8.2 23...... 29 7.0 6.7 8.6 8.7 39 136 65 25 12 3.2 8.2 24...... 24 6.7 6.8 9.1 8.6 58 190 48 21 12 3.0 8.2 25...... 8.6 6.6 6.7 9.1 8.6 62 88 35 16 11 2.7 8.C 26...... 3.7 8.7 6.7 9.1 8.2 153 64 28 12 11 2.7 7. ' 27...... 7.9 16 6.7 8.6 7.8 328 51 .24 9.8 11 2.7 8/ti 28...... 8.9 51 6.7 8.7 8.2 190 132 20 9.3 11 2.7 8.2 29...... S.2 45 6.6 8.6 8.2 126 190 17 8.7 10 4.6 . 8.0 30...... 8.2 62 6.7 8.6 153 93 16 8.9 11 7.9 20 31...... 9.3 6.6 9.0 ...... 103 15 11 8.9 *4 ' -COBrJSTECTICUT EIVER BASIN. 129 Monthly discharge ofPratt Brook at Chesham, N 'ept. SO, 1919 . ;, . - andl9%0. [Drainage area, 11.2 squaa-e miles.] JMscharge in, second-f eet. Run-off Month. POT in Maximum. Minimum. Mean. square incites. mile. 1919. July 8-31...... 10 1.9 3.17 0.283 0.25 8.2 1.2 2.97 .265 .31 Septtonber ...... 9.6 1.1 5.53 .494 .... -55 1919-20. October...... 32 3.7 9.49 .848 .93 62 6.6 12.8 1.15 1.23 57 . 6.6 , 17.1 1.53 1.76 January ...... 9.7 6.1 8.47 .756 .87 10 7.8 8.91 .796' .86 March ... v ;*; ...... , ...... s. . 328 7.5 56.3 5.03 5.80 April...... 404 34 98.1 8.76 9.77 May*....-...... *.....,...... -.. 65 15 35.8 3.20 3.69 June;...... :...... 46 8.7 18.0 U«l 1.80 July...... 20 8.6 11.9, 1.96 1.22 24 :- , 8.7 8.95 .199 .92 September . < ...... 20 .7,6 .8.50 .759 .86 404 2.7 . 24.5 2.19 29.83 MILLERS BIVER NEAR WUffCHEMDON, MASS. LOCATION. At steel highway bridge known as Nolan's Bridge, half a mile below mouth of Sip Pond Brook and 2 miles west of Winchendsta, Worcester County. DRAINAGE AREA. 80.0 square miles. RECORDS'AVAILABLE. June 5, 1916, to September 30, 19&p. " GAGES. Water-stage recorder on right bank below highway bridge; installed July 4, 1917; referenced to gage datum by hook gage inside well. Chain on bridge and staff on bridge abutment used for auxiliary readings. Recorder inspected by Franklin Epps and H. D. Sawyer. DISCHARGE MEASUREMENTS. Made from highway bridge or by; wading. CafANNEt AND CONTROL. Channel covered isith gravel and alluvial deposits. Con trol for low and io«dium stages is gravel bar abwit 80'feet feelow'gage. , EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder for the year ; ending Sejftembei? 30, 1919, 8.3 feet at noon May 23 (disct^rge,ri)y extension of rating curve, 1,180 second-feet); mimi^m stag* from wateTr-stagpe recorder, 2.39 feet at 1 p. m. November 10 and 2 a. m. February 17 (discharge, by extension of rating curve, 10 second-feet). Maximum stage from water-^stag* recorder for the year -ending September 30,^ 1920^.7.88 feet at .noon March 31 (discharge, by exteksion «f rating curve, 1,050 second-feet); miTrimujn stage, from water^etage recorder, 2i80 feet at 11.40 p. m. December 28 (discharge, by «xtenskm of rating curv% 13 $econd»tfeet). 1916-1920;: Maximum stage recorded, 8.3 feet at noon Magr 23, 3.919 (discharge by extension of rating curve, 1,160jseconii-feet); miaimum sta^fe recorded, 2.02 feet at 5 a. m. September 20, 1918 (discharge, practically zero; water held back by dams). ; ICE. Ice cover usually forms during the winter; owing to largser diurnal fluctuation, caused by operation of power plants in the vkinity of Winchendon, water fre- ; quentiy overflows the iee. REGULATION.- The (distribution of flow ie altected by operatiqai of power plants at and below Winchendon and by storage in Lake Monanaonac and other reservoirs. 102721 23 WSP5W. -9 130 SURFACE WATER SUPPLY, 1919-1920, PART I. ACCURACY. Stage-discharge relation somewhat shifting, on account of gravel bar 80 feet below the gage; several rating curves used, each well defined for range in stage covered. The operation of water-stage recorder was fairly satisfactory throughout the year except for periods shown in footnote to discharge table. Daily discharge ascertained by applying rating table to mean daily gage height as determined from recorder sheets with correction for effect of ice during winter. Records good. Discharge measurements of Millers River near Winchendon, Mass., during the years end ing Sept. 30, 1919 and 1920. Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1919. Feet. See.-Jt. Oct. 11 3.18 70 2.89 20.9 Nov. 7 .....do...... 3.34 111 27 3.36 106 Dec 10 1 V\ 102 Sept. 10 .....do...... 3.83. 176 10 3.82 173 1919. 11 .....do...... 3.26 82 Jan. 24 .....do...... 4.15 221 11 4.19 230 Feb. 13 3.32 106 Dec. 16 4.70 Apr. 30 M. R. Stackpole...... 3.68 182 30 B. L.Bigwood...... '.3.77 182 1920. M«nr 1 M. R. Stackpole...... 3.09 98 .....do...... o4.15 143 3.49 152 Feb. 20 .....do...... «4.42 43 4 1 .....do...... 4.17 238 26 .....do...... o 5, 58 137 .....do...... 3.15 56 May 4 H.S. Price...... 5.48 470 4 .....do...... 3.15 51 July 7 3.47 105 26 .....do...... 43 3.01 99 26 B. L. Bigwood.;...... 3.33 91 ; 8 ...... do...... 3.38 87 27 2.89 to o 3 99 51 <* Stage-discharge relation affected by ice. _ . Daily discharge, in second-feet, of Millers River near Winchendon, Mass. r for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 116 1...... 57 62 ' 144 73 310 369 152 144 74 K4 65 2...... 102 41 TO fvy\ 61 430 298 176 1 Kg . 85 46 85 3...... 97 30 7Q 215 117 370 283 164 iw 63 21 110 4...... ' 85 77 91 97 275 269 139 130 23 49 14A 5...... 68 75 91 IftK RS ISA 242 215 120 JO 63 137 6...... 46, 70. 97 180 79 207 215 283 110 22 6$ 130 7...... 67 67 91 165 73 207 228 269 97 63 63 8..1...... 65 73 S9 460 130 349 216 40 99 85 9...... 75 67 97 150 85 137 269 176 1 CO 97 97 10...... 50 12 85 145 90 369 255 202 130 '137 26 97 11...... 57 28 91 130 97 320 228 202 130 120 39 12...... 53 36 73 104 260 O9C o*n 120 110 74" ton 13...... 23 46 67 117\fn 104 230 9KJS 410 23 74 130 14...... :. 53 59 67 104 Ditty discharge, in second-feet, of Millers River near Winchendon, Mass., for the years ending Sept. 30, 1919 and 1920 Continued. r*1f Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June, July. Aug. ; Sept. 1919-20. 1...... 74 83 452 39 21 84 900 642 190 95 22 63 2...... 67 144 349 56 46 110 900 517 139 115 79 74 3...... 72 182 232 46 54 84 887 359 135 67 57 63 4...... 63 147 200 13 54 81 824 330 134 82 81 47 5...... 32 140 160 64 46 160 836 340 117 32 74 30 6...... 65 164 120 135 46 110 887 311 192 101 67 15 7...... 72 164 88 92 39 98 713 245 208 51 72 44 8...... 60 130 161 74 21 84 618 245 200 79 24 57 9...... 60 63 178 78 39 98 495 420 183 91 61 79 10...... 67 141 222 64 46 110 420 340 166 72 95 . 42 67 29...... 63 330 54 64 46 900 965 126 113 1 21 84 30...... 54 400 39 64 874 677 .71 74 - 67 51 178 144 su 31...... 64 46 952 7* -. ' : - 57 67 NOTE. Stage-discharge relation affected by ice Jan. 5-12,1919, and Dec. 16, 1919, to Mar. 22, 1920; dis charge for these periods based on gage heights corrected for effect of ice and by comparisons with other stations in Millers River basin. Discharge estimated Nor. 5-6; Dec. 26-31,1918, Jan. 1,10-20, Feb. 5, 9- 12, 25-28, Mar. 1-4.13-17, June 14-17, Sept., 1-4, Oct. 25, 26, Dec. 4-6, 1919, Apr. 26-27, July 25-26, and Sept. 26,1920, by hydrograph comparison with records at other stations in Millers River basin. Monthly discharge of Millers River near Winehendon, Mass!, for the!yettrs ending Sep£ SO, 1919 and 1920. [Drainage area, 80.0 square miles.} Discharge in second-feet. Kun-ofl Month. Per ih'inehes. Maximum. Minimum. Mean. square mile. 1918-19. October...... 116 11 56.0 0.700 0.81 193 12 83.6 1.04 1.16 December...... '...... 293 59 117 1.46 1.68 215 104 159 1.99 2.29 February...... _ ...... 172 20 92.9 1.16 1.21 March...... 584 130 '293 3.66 4.22 April...... 539 113 266 3.33 3.72 May...... 1,060 139 328 4.10 4.73 158 21 96.1 1.20 1.34 July...... '...... 144 21 75.7 .946 1.09 97 21 58.7 .734 .85 September...... 140 18 83.0 1.04 1.16 The year...... 1,060 11 143 1.79 24.26 1919-20. 144 25 58.3 .729 .84 462 32 155 1.94 2.16 December...... 452 13 143 1.79 2.06 135 13 60.7 .759 .88 84 21 45.3 .566 .61 952 84 397 4.96 5.72 April...... 965 293 637 7.96 8.88 May...... 642 71 246 3.08 3.55 230 53 145 1.81 2.02 July...... 115 24 73.3 .916 1.06 148 21 80.8 1.01 1.16 September...... 178 15 64.9 .811 .90 965 13 176 2.20 29.84 132 SURFACE WATER SUPPLY, 1&1&-1920, PART I. MILLERS RIVER AT ERVING, MASS. 4; LOCATION. One-fourth mile below dam at Erving, Franklin County, 8 miles above confluence of Millers River with Connecticut River and below all important tributaries. DRAINAGE AREA. 372 square miles. RECORDS AVAILABLE. August 1, 1914, to September 30, 1920. GAGE. Stevens water-stage recorder on right bank near downstream end of old chair factory; hook gage in well; vertical staff attached to downstream end of factory wall is used'for auxiliary readings. Water-stage recorder inspected by Napoleon Lemire. ,, ' DISCHARGE MEASUREMENTS. Made from cable near gage or by wading. CHANNEL AND CONTROL. Channel covered with coarse gravel and boulders; control section is a short distance below the gag* and is practically permanent. EXTREMES OF DISCHARGE . Maximum stage from water,-stage recorder for the year ending September 30, 1919, 4.93 feet at 7.30 a. m. May 23 (discharge, 3,780 second-feet); minimum stage from water-stage recorder, 1.03 feet at 2 p. m. September 1 (discharge, 12 second-feet). Maximum stage from waller-stage recorder for the year ending September 30, ; 1920, 5.74 feet at 10 a. m. March 28 (discharge, 5,800 second-feet); minimum stage, frofci water-stage recorder, 1.05 feet from 10 p. m. October 26 to 5 a. m. October 27 (discharge, 14 second-feet). 1914-1929: Maximum open-water stage recorded, 5.74 feet at 10 a. m. March' 28, 1920 .(Discharge, 5,800 second-feet); a stage of 5.97 feet was recorded at 8.30 , a. m. February 27, 1918, but the stagerdischarge relation was affected by ice; minimum discharge, practically zero at various times during 1915 and at 3.30 $. m. October 29, 1916, when ^ater was held back by dams above the gage. ICE.- River freezes over below the gage at varwus?stuaes_ during the winter; ice considerably broken by rising and fajjing stages owing to power operations; sj&ge-discharge relation is seriously affected. REGULATION. Distribution of flow affected by operation of power plants and storage reservoirs above the station. , ,. ACCURACY. Stage-discharge relation practically permanent except when affected by ice. Rating curve well defined below 4,000 second-feet. Operation of jw^tejj-Btage recorder was satisfactory except for short periods as indicated in footnote to discharge table. Daily discharge ascertained by use of discharge integrator; with corrections for effect of ice during winter. Records good. Discharge measurements of Millers River at Erving, Mass., during the years ending Sept. SO, 1919 and 1920. ' . Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Secjt. 1920. Feet. Sec.4t. Dec. 12 2 74 885 Jan. 12 M. R.Stackpole...... o2.72 m Feb. 16 .....do...... o 3. 89 294 1919. Mar. 10 H.S. Price...... 03. sa 829 Jan. 23 .....do...... ' 3.04 827 18 .....do...... o4.85 2,780 Feb. 15 2.88 Aug. 28 2.05 22* Stage-discharge relation affected by ice. BIYEE BASIN, Daily discharge, in second-feet, of Mittefs River at Erving, Mass., for the years ending Sept. 30,1919 and 19ZO. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 720 195 270 560 600 1,060 1,700 535 570'590 228 224 22 2...... 550 250 A AK 880 395 i snn 1 340 670 305 209 209 3...... 435 50 355 1,180 390 1 460 1^200 905 560 180 121 315 4...... 440 190 365 i i4n 420 i,yx) 1,160 570 400 157 166 695 5...... 425 235 OCA 760 420 1,160 1 l^fl 780 .380 216 141 625 89* '147 6...... 260 260 320 710 390 1,240 1,060 950 365 510 7...... MH 660 1,200 1 040 860 340 170 144 380 8...... 335 250 220 605 380 1,080 1^080 780 315 160 160 350 9...... 365 97ft OQft 575 ' 245 970 1.100 740 350 141 190 890 10...... ws 43 350 570 400 1,660 1,020 700 400 194 213 455 11...... QiJA 240 320 540 }f¥l 1,620 970 860 445 350 133 , 485 12...... 330 265 W¥l 530 300 1 *JflA 1,220 1,050 405 272 150 515 13...... 215 250 320 510 265 1,100 1,220 1,230 360 305 166 8K» 14...... 9W 220 365 280 910 1 240 1,220 288 160 147 8«0 15...... 320 188 740 570 380 740 1^120 1,040 292 13S 147 300 16...... 250 245 1 44O 700 182 *tfn 1,060 870 244 «209 Mi: 330 17...... 235 50 1,320 800 300 660 1,680 820 276 216 67 284 18...... 240 500 990 900 255 810 1,880 1,070 236 213 260 264 19...... 335 880 800 860 280 1,240 1 600 1,110 240 213 166 248 20...... '..... 80 40 '' '-SJfir ?3,470' 187 52a 133 224 24...... 330 400 1,080 820 250 l'280 3,240 205 845 63 244 25...... 260 435 1 ^ftft 1,060 266 1 14ft 7&fi 2,610 220 535 209 240 26...... 285 440 1,500 1,000 430 1,020 740 2,070 194 395 190 240 27...... 80 405 1 260 910 430 oon COfi 1,530 220 160 1«J 190 28...... 170 270 'oQfl 750 435 2,350 6*0 1,260 1S7 325 166 106 29...... 210 650 700 3 *>en 7^ 1,030 147 2S8 176 220 30...... 205 450 760 640 ,.. 2,650 535 830 1&3 24b 106 202 31...... 175 600 570 2 ten 730 248 67 1919-20. 1...... 200 340 1 900 2SO 220 86 4 OKA 2,740 530 470 V4 240 2...... 200 500 l'620 300 240 110 4,200 2.200 570 430 325 250 3...... 91 ft 890 | ago, 300 260 135 4 130 1.760 500 430 290 245 4...... 290 700 1 '860050 240 280 160 3,850 1,500 460 380 270 240 5...... 64 760 300 280 185 3,700 1,510 420 320 280 225 6...... 290 880 660 260. 280 Q7R 4,050 I Oflfl 750 440 296 200 7...... 186 880 550 280 >40 600 3 «Crt 1,210 910 250 300 230 8...... 174 730 700 280 '85 620 3,050 1,06* 990 400- 190 240 9...... 200 Sfift 9W 'K5 620 2 OCA 1 9Qf) 820 290 220 260 10...... 198 700 1,200 300 10.5 600 i onc\ 1^570 610 290 215 240 11...... 260 450 703 185 185 600 1,680 1,340 590 250 187 260 12...... 56 560 1,140 240 i.<* 630 1,580 1,240 500 320 375 220 13...... 114 640 1,120 260 165 ,000 2,060 1;120 3 -- ) 320 360 3;2> 14...... 230 830 1,080 280 135 !,7DO 3,560 970 470 330 425 285 15...... 255 900 860 320 74 1,860 3,420 1,080 340 370 430 300 16...... 200 650 1,080 320 150 1,660 2,940 1,000 470 330 590 270 17...... 226 600 GQfl 280 120 2 I¥M1 2,500 980 660 280 690 300 18...... 270 570 860 220 120 2,400 2,020 890 1,460 170 730 255 19...... Oi 480 7AH 260 120 2 0 fU\ 1,700 820 1,460 350 650 200 20...... 420 420 620 300 150 1,900 1,420 700 1,260 315 560 245 21...... 200 400 400 300 96 1,850 1,360 840 1,100 320 430 240 22...... 215 400 540 280 56 1,750 1,720 1,560 1,880 305 320 220 23...... 225 OR OOfl 260 92 1,750 2,170 1,760 1,020 320 280 200 24...... 225 440 380 220 170 2,200 2,830 1,560 890 215 285 210 25...... 245 430 270 150 125 2,800 2,980 1,360 770 250 300 210 26...... 56 640 560 165 135 3,700 2,510 1,180 660 235 250 100 27...... 270 1,780 420 300 135 4,800 1,860 1,060 490 210 230 215 28...... 235 2,100 220 300 120 5,500 2,210 870 520 245 230 200 29...... 335 1,780 380 300 120 5,400 a, TOO 730 520 240 220 220 30...... 295 i s/nn 360 300 4,950 9 wn 510 v 560 200 250 690 31...... 375 310 280 4,450 500 240 245 NOTE. Stage-discharge relation affected by ice Jan. 6-16, 1919, and Dec. 18, 1919, to Mar. 21, 1920; dis charge for these periods based on gage heights corrected for effect of Lee. Discharge Dee. 6-12, 1918; May 4-11, 1919; Aug. 6-9, and Aug. 30 to Sept. 10, 1920, estimated from twice-daily readings of staff gage and comparison with records at other stations in the MiDers River basin. 134 SURFACE'"WATER SUPPLY, 191&-1920, PART I. Monthly discharge of Millers River at Erving, Mass., for the years ending Sept. SO, 1919 and 19%0. [Drainage area, 372 square miles.) Discharge in second-feet. Run-off Month. Pel- in inches. Maximum. Minimum. Mean. square mile. 1918-19. 720 80 300 0.806 0.93 950 43 358 .962 1.07 1.560 220 664 1.78 2.05 1,180 380 698 1.88 2.17 600 182 337 .906 .94 March...... 3,250 560 1,400 3.76 4.34 ,A|ril...... ?...... 1,880 535 1,100 2.96 3.30 May...... 3,470 535 1,220 3.;28 3.78 Jtthe ...... 590 147 309 .831 .93 July...... l...... '845 89 256 . 688 .79 August...... 260 63 157 .422 .49 695 22 306 .823 .92 3,470 22 595 1.60 21.71 1919-20. 420 56 220 .591 .68 November: ...... 2,100 95 765 2.06 2.30 1,900 20) 774 2.08 2.40 January ...... ,..:...... 320 150 268 .720 .83 280 56 165 .444. .48 March...... 5,500 86 1,890 5.08 5.86 April...... 4,250 1,360 2,770 7.45 8.31 Mav 2,740 500 1,230 3.31 3.82 June...... 1,'880 340 749 2.01 2.24 July...... 470 170 ' 304 .817 .94 August...... 730 184 342 .919 1.06 690 100 251 .675 .75 The year...... 5,500 56 813 2.18 29.67 SIP POND BROOK NEAR WINCHENDON, MASS. LOCATION. About 500 feet above highway bridge one-fourth mile below Massachu setts-New Hampshire State line, 1$ miles below outlet of Sip Pond, and 3 miles northwest of Winchenddn, Worcester County. DRAINAGE AREA. 18. 8 square miles. RECORDS AVAILABLE. May 29, 1916, to September 30,1920. GAGE. Ghirley graph water-stage recorder on left bank 500 feet above highway bridge, with hook gage inside well; a vertical staff is used for auxiliary readings. Prior to June 26, 1917, an inclined Staff on right bank 50 feet above highway bridge was used. Recorder inspected by Hazel Greenall. DISCHARGE MEASUBEMENTS. Made from footbridge, 15 feet below vertical staff gage, or by wading. CHANNEL AND CONTROL. Channel rough, with boulders. Control clearly defined. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder for the year ending September 30, 1919, 9.34 feet at 1 p. m. May 23 (discharge, by extension of rating curve, 339 second-feet); minimum stage from water-stage recorder 4.9 feet at 6 p. m. August 16 (discharge, 1.1 second-feet). Maximum stage from water-stage recorder for the year ending September 30, 1920, 9.3 feet at 10 a. m. March 28 (discharge, by extension of rating curve, 305 second-feet); minimum stage, from water-stage recorder, 5.08 feet at 9.30 a. m. September 25 (discharge, 1.9 second-feet). 1916-1920: Maximum stage recorded, 9.34 feet at 1 p. m. May 23, 1919 (dis charge, by extension of rating curve, 339 second-feet); minimum discharge during period, 1.1 second-feet, occurred at 6 p. m. August 16, 1919. CONNECTICUT iBIYER BASIN. REGULATION.- The distribution of flow is considerably affected by Operation of mills at State Line, N. H., and by storage in Pearly Pond and Sip Pond. ACCURACY. Stage-discharge relation subject to slight changes at low stages. Rating curves well (Jefmed below 250 second-feet. Operation of water-stage recorder was fairly satisfactory, except during winter when it was affected by ice in gage well. Daily discharge determined by applying rating table to mean daily gage height, with correction for effect of ice during winter. Records good during open-water periods, and fair during winter. Discharge measurements of Sip Pond Brook near Winchendon, 'Mass., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1920. fett. Sec.-ft. Dec. 9 M. R.Staekpole...... 5.97 28.3 Jan. 14 o5.68 14.8 1919, Feb. 20 .....do...... o5.68 8.4 Jan. 24 .....do...... 6.28 41.4 Apr. 2 .....do...... :,...... 8.53 224 Feb. 14 J.W.Moulton...... 6.10 34.1 2 .....do...... 8.51 218 Mar. 11 6.88 75 May 5 .....do...... 7.01 86 May 1 M. R.Stackpole...... 6.24 39.4 July 8 5.94 ..26.0 Sept. 11 <\ M. 8.0 Sept. 18 5.29 . 6.8 11 M. R.Stackpole...... 5.44 8.0 Oct. 15 B. L. Bigwood...... 5.26 4.2 o Stage-discharge relation affected by ice. ' ' . Daily discharge, in second-feet, of Sip Pond Brook near Winchendon, Mass., for the years ending Sept. SO, 1919 and 19%Q. Day. Oct.- ;Nov. Dec. Jan. Feb. Mar. Apr. May. : June, July. ;Aag. Sept; 1918-19. 1...... 50 15 6.4 32 30 47 88 28 34 9.3 2.6 5.3 2...... 45 12 9.3 59 20 52 78 34 38 6.6 2.6 7.0 3...... 34 9.6 9.9 74 28 47 69 53 33 5.5 3.1 15, 4...... :...,.. 28 13 11 60 28 ' 42 65 42 27 2.5 1.9 17 5...... 26 11 12 64 27 ' .37 63 56 21 7.0 2.2 11 6...... 22 13 13 58 25 38 60 61 21 3.0 2.7 9.9 28 11 15 47 22 40 63 57 20 7.8 2.2 8.6 8...... 24 10 13 39 20 42 60 42'49 60 8.0 1.9 8.3 9...... 21 , 9.3 18 34 8.8 44 54 22 5.3 1.7 8.0 10.. ..I...... :.. 18 3.2 20 30 23 48 57 41 18 7.8 1.5 8.8 11...... 17 2.4 20 32 23 54 55 42 19 6.6 1.8 9.3 12...... 16 2.4 18 28 20 58 76 59 18 5.5 2.0 8.0 13...... 12 4.6 16 30 18 51 - 78 63 14 2.8 2.4 14 14...... 19 8.0 18 34 16 48 77 63 12 5.5 1.3 8.0 15...... 15 8.8 32 33 20 39 66 56 6.6 4.6 1.2 8.8 16...... 14 7.8 86 31 7.0 25 62 45 10 8.0 1.2 1Q, I7.f ...... 13 6.2 74 24 20 37 90 42 9.6 4.6 1.1 9.6 18...... 12 28 64 18 18 35 107 62 9.3 5.1 1.2 11 19...... 9.6 45 51 14 23 49 89 66 9.9 2.7 1.3 8.8 20...... 6.4 46 39 27 20 82 75 59 9.3 2.2 1.3 8.3 21...... 15 45 30 20 18 88 67 55 9.6 4.4 1.4 7.8 22...... 15 43 30 14 16 102 61 153 4.6 9.1 1.6 7.8 23.....:...... 15 43 56 16 8.3 78 46 327 13 7.0 1.4 7.8 24...... 14 30 65 28 16 73 46 257 9.9 7.3 1.7 8.6 25...... 13 29 37 16 67 47 170 9.9 5.9 1.9 11 26...... 13 23 90 32 17 57 45 128 6.4 6.4 1.9 13 27...... 8.3 20 69 37 24 49 45 97 '4.97.3 3.4 2.6 12 28...... 15 21 51 44 33 100 38 77 7,3 2.4 4.7 29...... 15 23 46 37 168 30 63 2.8 7.t) 2.4 5.3 30...... 16 24 48 33 118 30 53 6.6 5.3 3.5 e.4 31...... 13 39 31 107 44 1.9 2.6 136 SURFACE WATEE SUPPLY, 1M»-1920, PART I. Daily discharge, in second-feet, of Sip PondBrook near Winehendon, Mass., for the years ending Sept. 30,1919 and 1920 Continued. . t % . Day. Oct. Nov. Dec. .Jan. Feb. Mar. Apr. May. June. JaJy- Aug.. Sept. 1919-20. I...... 8,0 3927' ' 91 28 10 7 219 151 31 17 5.» 9.1 2...... 8.3 76 28 15 7 216 123 26 16 5.5 9.6 3...... 8.0 31, 56 27 18 6 215 112 2fl :i5 5,1 9.1 4...... 8.0 32 46 9.9 22 5 218 95 ' 2827 1.9 5.5 8.6 5...... 7.5 32 41 19 20 6 ' 205 85 . 9.6 4.7 3.2 6...... 7.0 32 38 20 20 16 213 71 24 13 5.9 4.7 7...... ,.8.8 29 36 20 16 13, 195 66 33 14 5.9 9..1 8...... 8.3 26 44 9.6 10 12 156 ' 6680 32 15 3.2 9.9 9...... 5.9 21 58 9.6 11 11 125 30 13 4.2 7.8 10...... 5.9 26 61 17 10 11 112 83 27 8.8 3.5 8.0 11...... 15 23 60 11 9 13 92 69 27 4.9 5.7 11 12...... 5.5 28 56 16 7 18 92 66 25 13 5.9 6.6 1&...... 8.0 32 46 18 5 32 134 60 15 15 7.0 12 14...... 4-2 30 52 « 5 100 200 19 14 8.0 10 15...... 7.5 28 54 13 3 88 180 &0 22 13 12 12 18...... 9.0 23 45, 16 9 .80 155 46 22 .8.0 16 11 17...... 10 32 39 16 10 78 137 48 22 ' 8.8 21 9.0 is 9.6 ^1 42 to 10 74 121 44 36 5.1 20 7.0 19...... 5.9 31 in 16 8 74 119 38 42 12 21 8.8 20...... 9.0 28 24 18 8 70 105 35 ' 4ft, 12 19 6.4 21...... 9.0 26 o a 20 9 92 90 37 47 8.0 19 4.2 22...... 8.3 26 18 20 fl 110 136 51 38 5:9 14 . 3.1 23...... 9.1 14 14 18 8 160 168 68 40 8.6- 20 2.0 24...... 9.6 26 14 16 8 210 204 69 36 7.5 12 1.9 25...... 11 26 7.3 13 8 230 182 59 33 4.7 13 2.0 26...... 6.8 28 14 14 7 250 148 40 27 11 12 . 2.6 27...... 9.6 49 13 16 6 300 114 39 16 8.6 12 3.7 28...... 11 99 7.8 18 6 288 155 38 22 7.3 8.6 7.0 20...... 18 85 1« IS 7 281 246 22 7.fr 8:8 11 30...... 16 89 24 16 235 193 28 20 4.7 15 17 31...... 19 26 13 224 27 4.2 12 NOTB. Discharge estimated Oct. 8,9, 11,12; Nov. 3, 11-13, 19-21, 27-29; Dec. 1-5, 8-13, 1918; Jan. 6,7, 10-15, 23-89, 31; Feb. 1-&, 21-28; M*r. 1-11, 30: Apr. 26-28; May 26; June 22; July 31; Aue. 16-20, 31; Sept. 1-3, 7-10, 21-26; Oct. 3-5,16,17, 20,21; Nov. 1-4; Dec. 7-#, 29-31, 1919; Mar. 22-27; Apr. 12-14. and Sept, 17, 1920, by hydrograph comnarisons with records at other stations in Millers River basin. Stage-discharge rela tion aflEected by ice Jan. 16 to Mar. 20,1920; daily discharge forthis period based on gage heights corrected for effect of ice by means of two discharge measurements, observer's notes, weather records, and, compari son with other stations in Millers River basin. Monthly discharge of Sip Pond Brook near Winehendon, Mast., for the years ending Sept. 30, 1919 and 1920. [Drainage area, 18.8 square miles.] Discharge in second-feet. Run-off Month. Persq. in inches. Maximum. Minimum. Mean. mile. 1918-19. October ...... 50 6.4 18.8 1.00 1.15 46 2.4 18.9 1.01 1.13 December ...... 90 6.4 37.2 1.98 2.28 74 14 35.4 1.88 2.17 33 7.0 20.2 1.07 1.11 168 25 62.1 3.30 3.80 April...... 107 30 62.9 3.35 3.74 May...... 327 28 78.8 4.19 4.83 60 2.8 16.2 .862 .96 July...... 9.3 1.9 5.66 .301 .35 3.5 1.1 1.96 .104 .12 September...... 17 4.7 9. 30 .495 .65 327 1.1 30.7 l.«8 22.19 1919-20. 19 4.2 9.19 .488 .56 99 14 34.6 1.84 2.05 91 7.3 37.4 1.99 2.29 28 9.6 16.7 .888 1.02 22 3 10.0 .532 .57 March ...... 300 5 99.4 5.29 6.10 April...... 249 92 162 8.62 9.62 May...... 151 27 62.4 3.32 3.S3 49 15 28.8 1.53 1.71 July...... 17 1.9 9.83 .523 .60 21 3.2 10.6 .564 .65 September.!...... 17 1.9 7.60 .404 .45 300 1.9 40.8 2.17 29.45 CONNECTICUT? EIVER BASIN. 137 , BBIEST BBOOK NEAK WESfCHEHDOH, MASS* LOCATION. At highway bridge 3 miles above confluence of Priest Brook with Millers River and 3J miles west of Winchendon, Worcester County. DRAINAGE AREA, -1S.8 square miles. RECORDS AVAILABLE . May 25, 1916, to September 30, 1917, arid July 18, 1918,, to September 30, 1920. GAGS. Sloping staff on left bank 20fr feet below highway bridge;, read by R. D. Hutchineon. ; DISCHARGE MEASUREMENTS. Made from highway bridge or by wading. CHANNEL A#» CONTROL. Channel above the station is straight, witib. fairly uniform section and gravel bottom. Control is formed by the foundation of an old dam 30 feetbelow the gage and is practically permanent. EXTREMES OP DISCHARGE. Maximum stage for the year ending September 30,1919, estimated as 6.5 feet (water over top of gage) at 7 a. m. March 2$ (discharge, by extension of rating eurve, 700 seeond-feet); na inm?yn stage recorded, ^.12 feet at 7 p. m. August 12 (discharge, 1.8 second-feet). Maximum stage fov the year ending September 3d, 1920, estimated as 5.2 feet (water over topfof gage) March 29 (discharge by extension of rating curve,.380 second-feet); minimum stage recorded, 2.35 feet at 8'a. m. October 5 (discharge, 2.5 second-feet). Maximum stage during the periods May 25, 1916, to September 30, 197 7, and July 18,1918, to September 30,1920, estimated as 6.5; feet (water over top uf gage) at 7 a. m. March 28y 1919 (discharge by extension ef .rating curve, 700 second- feet); minimum; stage recorded during periods, 2.11 feet at 7 a, m. August 26, 1918 (disciiarge, 1.3 second-feet). ICE. Brook freezes over at gage, but usually remains open at control; stage-discharge relation seldom affected. REGULATION. Flow not appreciably affected by regulation. ACCURACY. Stage-discharge relation practically permanent; Rating curve well defined below 200 aeeond-feet. $age read to hundredth^ twice daily. Daily discharge ascertained by applying rating table to mean daily gage height Records good. Discharge measurements q/Priest Brook near Winchendon Mass., during tn& years c wiing Sept. SO, 1919 and 1920. DiS' Gags- Dis Date. Made by 4* charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1919. Feet. Sec.-fL Oct. 11 H. W. Fear...... 2flft * i i Apr. 30 3.12 27.7 Nov. 7 .....do...... 2.77 12.4 Sept. 11 .....do.....:r...... 2. 56 6.2 Dec. 10 M. R. Stackpole...... 2.96 20.1 1920. 1919. Jan. 14 .....do...... 2.5S 6.2 Jan. 24 .....do...... 3.50 62 May 4 .....do...... 3.71 87 Fteb. 14 2.73 13.3 July S Stackpole and Hoytu . . 2.6& 7.3 138 SURFACE WATER SUPPLY, 1919-1920, PART I. -Daily di , in second-feet, of Priest Brook near Winchendon, Mass., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 39 11 24 28 28 78 112 30 26 3.0 2.1 2.2 2...... 28 7.3 15 57 25 97 156 21 24 2.7 2.0 . 2.5 3...... 29 11 17 69 22 73 130 19 24 3.0 2.0 10 4...... 23 5.6 is 106 17 61 fJO 18 25 2.5 2.2 13 5...... 24 8.2 1Q Of! 16 KG 60 19 27 3.0 2.4 9.7 G...... 26 8,2 22 49 17 62, 57 21 30 3.4 2.5 9.7 7.....;...... 28 18 20 45 16 67 61 43 33 3.4 2.4 8.2 a...... 25 18 17 28 16 72 73 47 26 2.;?' 2.1 7.3 9...... 21 21 17 91 14 77 63 49 24 2.5 1.8 5.9 10...... 23 20 22 18 14 103 61 44 26 3.4 L9 5.4 11...... 20 SX 24 OK 12 123 Mast., for the years ending Sept. 30, 1919. and mo. [Drainage area, 18.8 square miles] Discharge in second-feet. Run-off Month. in Per inches. Maximum. MfoiJTnijm. Mean. square mite. 1918-19. October...... 39 6.1 20.7 1.10 1.27 November...... 67 , 4.8 20.1 1.07 L19 December...... ' 131 10 56.0 2.98 3.44 -January...... 106 18 36.9 1.96 2.26 February ...... 28 7.0 12.9 .686 .71 March...... 500 33 118 6.28 7,24 April...... 156 31 67.0 3.56 3.97 May...... - 297 18 84,5, 4r49 .5.18 -June...... 33 2.7 14.5 .771 .86 July...... 20 2.1 4.64 .247 .28 August...... 2.5 1.5 1.97 .105 .12 : September...... ; 14 2.2 7.27 .387 .43 The year...... 500 1.5 37.3 1.98 26.95 1919-20. October...... 37 2.5 8.7 .463 .53 November ...... 140 15 48.8 2.60 2.90 December...... 98 9.7 37.0 1.97 2.27 .January...... 12 4.4 6.7 .366 .41 February...... 10 6-5 8.1 .431 .46 March...... 330 7.9 134 7.13 8.22 April...... 309 78 179 9.52 10.62 May...... 174 16 65.2 3.47 4.00 June...... 91. IS, 37.5 1.99 2.22 .July\...... 29 4.0 10.4 .553 .64 August...... 88 4.4 29.9 1.59 1.83 30 2.8 13.4 .713 ^80 The traar 380 2.5 48.1 . 2.56 34.90 EAST BRANCH OF TTJLLY RIVER HEAR ATHOL, MASS. « LOCATION. At highway bridge half a mile below mouth of Lawrence Brook and 3$ miles north of Athol, Worcester County. DRAINAGE AREA. 50.2 square miles. RECORDS AVAILABLE. June 13,1916, t0 September30,1920. GAGE. Vertical staff on downstream side of right abutment; read by W. A. Thomp son. ! ,,-- DISCHARGE MEASUREMENTS . Made from highway bridge or by wading. -OHANNEL AND CONTROL. Two channels under "bridge, one channel above; about 200 feet below the gage the channel is divided by an island, and the control sections are formed by rocks and boulders in the two channels, practically per manent. 1 EXTREMES OP DISCHARGE. Maximuin stage recorded for the year ending September 30,1919, 3.5 feet at 7 a. m. March 29 (discharge, by extension of rating curve, 655 second-feet); minimum stage recorded, 0.22 foot August 12,13, and 14 (discharge, 2.2 second-feet). Maximum stage recorded for the year ending September 30,1920, 4.2 feet at 7 a. m. March 29 (discharge, by extension of rating curve, 1,000 second-feet); minimum stage recorded, 0.48 foot at 8 a. m. and 5 p. m. September 5 and 6 (discharge, 9.2 second-feet). 1916-1920: Maximum stage recorded, 4.2 feet at 7 a. m. March 29, 1920 (dis charge, by extension of rating curve, 1,000 second-feet); minimum stage recorded, 0.22 foot August 12,13, and 14,1919 (discharge, 2.2 second-feet). 140 SUKFAGE WATER SUPPLY, 1919-1920, PART I. ICE . Eiver freezes slightly along banks, but stage-discharge relation iaseldam affected. DIVERSIONS. About half a mile below the station water is diverted through a canal into Packard Pond. A discharge measurement April 30, 1919, showed a flow of 16.&s@Gond-feet diverted through the canal. REGULATION. Flownofcsfltiausly affiected by regulation. AeetiBACY. Stage-discharge relation practically permanent. Rating curve well definecl below 300 second-feet. Gage read to hundredths twice daily, except from December 9, 1918, to March 20, 1919, and January 1 to March 24, 1920, when it was read once daily. Daily discharge ascertained by applying rating table to mean daily gage height. Records good. discharge measurement of East Branch of Tully River near Athol," Mass., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft 1920. Fett. Sac;-/*. Dee. 11 1.1« 34.fr Jan. 13 O.S4 23.5 .....do...... 68 16.4 l«i. Apr. 30 .....do...... 1.54 74 Daily discharge, in secowdrfeet, of East Branch of Tully River near Athol, Mass.) fov years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mac. Apr. May. June. July. Aug. Sept: ' ' 1918-19. 1...... 130 31 72 I2T E14 161 273 67 79 9.2 7.0 6.1 2...... " 106 34 66 218 95 251 234 93 65 8.2 6.1 7.9- 3...... 85 28 56 195 83 218 197 121 59 7.3 5.2 3Z 4...... 73 30 52 175 71 207 188 103 F.2 6.1 4.1 80 5...... 64 34. 51 ,,,1PO. 69 212 174 153 42 6.1 3.8 65 6..*...... 66 34 45 155 65 276 181 193 28 6.1 3.6 46 7...... m>r 31 4* 14& 64 246 181 161 31 7,9 3,8 38 8...... 61 31 45 145 55 218 174 136 a4 8.2 3.8 27 9...... 51 28 46 141 sa 202 170 nc. fl"! ze; 3U 29 10...... 4C 29 45 134 46 337 153 46 10 2.9 32. 11...... 41 28 40. 120 42 269 136 139 56 17 £5 32 12...... « 26 43 107 36 212 193 149 39 12 2.2 32 ia...... 38 25 4* 99 ay :.- 197' 23*. 149 32 9.3 2.2 34 14...... 37 24 58 93 31 137 202 141 30 7.6 2.5 34 15...... 35 23 183 93 39 120 172 125 24 6.4 3.1 27 16...... 33 24 302 90 46 117 159 109 21 9.2 3.4 26 17...... 30 1 2ft 257 85 45 991 248 101 18 16 3.4 28 18...... 29. .72 197 83 43 120 279 179 16 15 3.S , 19 19...... ;.. 27 188 161 80 39 218 248 195 15 14 6.4 16 28...... 25 193 141 80 34 309 207 155 14- 11 6il 14 21...... 33 159 130 73 on 326 165 136 14 10 5.81 13 22...... 45 132 120 71 29 320, 143 251 13 8.5 5.2 13 2$...... 43 115 193 7S 30 203 12* 465 11 48 4.6 16 23...... 49 103 246 141 t& 220 107 373 11 52 4.6 18 25...... 35 on 295 202 40 190 109 295 11 35 6.4 18 26...... 34 78 263 188 51 165 100 248 10 24 6.L IS 27...... 32 62 240 165 62 153 88 205 11 19 6.4 16 2%...... 29 62 202 165 60 355 80, 168 U 15 7.3 14 29...... 29 70 170 141 632 83 136 11 12. 6.7 11 30...... 26 79" 141 123 465 72' 112 9.8 9.5 6.1! 12 31...... 28 127 110 369 100 7.9 5.5 CONNECTICUT DRIVER BASIN. 141 Daily discharge, in second-feet, of East Branch of Tully River near Athol, Mass., for the years ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. «&: ' Apr. STay. June. Jiily. ' Aug. Sept. 1919-20. j " 1...... 11 85 320 42 22 25 5875BS 369 50, 61 34 16 2...... 10 113 260 42 22 24 289 45 51 m 14 3...... 11 155 210 36 22 24 565 237 40 43 30 12 4...... : 11 128 163 ^i 21 24 587 215 35 53 23 12 5...... 13 125 145 20 22 25 525 212 46 48 17 9.2 6...... 14 145 125 22 38 32 632 197 117 42 14 9>.2 7...... 20 139 117 20 27 39 525 176 120 31 13 10 8...... 17 127 16 23 51 389 ; 176 100 27 12 12 9...... 16 112 123 18 22 58 144. 212 74 22 11 14 10...... 9ft 100 01 K 19 99 60 *W7 240 56 23 10 17 25' 11...... 96 226 '"22 23 B2 223 215 43 20 22 41 12,,...... & 97 200 20 23 67 218 1«8190 36 32 . 88 , '4545 13...... 21 117 195 22 23 104 " 260 30 48 127 14...... 20 165 205 20 22 207 677. 143 31 43 ! 166 52 15...... 20 1 CQ 1 QQ 22 24 295 565 145 28 32 151 51 16...... 21 107 157 21, 25 276 433 123 37 26 ' 237 42 17...... JR 134 23 26. 316 355 > '112 m 23. ,' 2*ts: 07 18,,, ...... 31 115 103 - 20 27 373 302 96 174 17. 200. 29 19...... 31 103 83 20 26 263 «5 229 21 143 27 -28 Q57 ITfi 20...... 94 69 20 , 24 234 76 3432' 101 21 21...... 25 77 58 21 23 337 232 90 128 26" "*'. «i71, 20 22...... 23 77 19 21 22 263 369 205 125 18 23...... V -tS2 77 1918-19. October....'...... 130 25 47.0 0.936 1.08 193 23 63.0 1.25 1.40 295 40 131 2.61 3.01 21S n 128 2.55 2.94 104 29 51.0 1.02 1.06 March...... 632 99 245 .4.88 5.63 April...... 279 72 169 &37 3.76 May...... 465 67 166 8.31 3.82 79 9.8 28.4 .566 .63 July...... 52 6.1 14.0 .279 .32 7.0 2.2 4.64 .092 .11 .80 6.1 25.5 W .57 632 2.2 90.0 1.79 24.33 1910 -2C. 80 10 26.4 .526 .61 401 77 143 2.85 3.18 320 42 126 2.51 2.89 January...... 42 16 22.9 .456 .53 February...... 27 21 23.7 .472 .51 975 24 293 5.84 6.73 April...... 677 218 420 8.37 9.34 May...... 369 59 170 3.39 3.91 June...... 229 28 80.4 1.60 1.78 July...... 61 11 29.5 .588 .68 248 10 62.6 1.25 1.44 59 9.2 24.1 .480 .54 975 9.2 119 2.37 32.14 142 SURFACE WATER SUPPLY, 1&19-1920, PART I. MOSS BROOK AT WENDELL DEPOT, MASS. LOCATION. One-fourth mile above confluence with Millers River and one-fourth mile from Wendell Depot, Franklin County. DRAINAGE AREA. 12. 2 square miles. RECORDS AVAILABLE. June 7, 1916, to September 30, 1920. From June 4 to October 16, 1909, records were obtained at a station near the mouth of the stream, and from April 25 to August 27, 1910, at a weir a short distance below the present location. GAGE. Sloping staff on left bank; read by C. M. Porter and M. C. Eno. DISCHARGE MEASUREMENTS. Made by wading. CHANNEL AND CONTROL. Channel composed principally of ledge rock and boulders; control practically permanent. ^ EXTREMES OF DISCHARGE. Maximum stage recorded, for the year ending September 30, 1919, 3. 8 feet at 1 p. m. March 28 (discharge, by extension of rating curve, 190 second-feet); minimum stage recorded, 0.93 foot August 12-13 (discharge, 1.4 second-feet). Maximum stage recorded for the year ending September 30, 1920, 3.52 feet at 5 p. m. April 14 (discharge, by extension of rating curve, 16^3 second-feet); mini mum stage recorded, 1.02 feet at 7 a. m. and 5.30 p. m. September 5 (discharge, 1916-1920: Maximum stage recorded, 3.8 feet at 1 p. m. March 28, 1919 (dis charge, by extension of rating curve, 190 second-feet); minimum stage recorded, 0.85 foot at 9 a. m. August 26, 1918 (discharge, 0.9 second-foot). ICE. Stage-discharge relation slightly affected by ice for short periods. REGULATION. Flow not affected by regulation. ACCURACY. Stage-discharge relation practically permanent throughout the year, except when affected by ice. Rating curve well defined below 60 second-feet. Gage read to hundredths twice daily, except from November 18, 1918, to April 1, 19J9, and January 11 to March 27, 1920^ when it was read once daily. Daily dis charge ascertained by applying rating table to mean daily gage height, with correction for effect of ice during a few days in January and December, 1919. Records good. Discharge measurements of Moss Brook at Wendell Depot, Mass., dwring the years ending Sept. 30, 1919 and 1920. Dis Gage Dis Date. Made by height. charge. Date. Made by charge. 1919. Feet. Sec.-ft. 1919. Feet. Sec.-ft. Jan. 23 al.53 11.5 Sept. 12 M. R. Stackpole...... 1 4Q 12.1 Feb. 6 J.W.Moulton...... 1.39 7.9 Apr, 29 1.68 20.7 1920. 29 1.68 20.7 Aug. 28 1.03 2.0 Sept. 12. :.... .do...... 1.49 11.2 Oct. 7 J. L. Lamson...... 1.45 9.5 Stage-discharge relation affected by ice. CONNECTICUT RIVEK BASIN. 14S Daily discharge, in second-feet, of Moss Brook at Wendell Depot, Mass,, for the years ending- Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 10 4.9 9.0 32 15 63 52 19 17 2.7 2.3 4.6- 2...... 8.5 4.4 8.5 42 14 71 48 40 15 2.5 2.0 5.7 3...... 7.4 3.9 8.2 36 16 49 35 38 14 2.3 1.8 26 4...... 6.3 4.6 7.6 34 18 34 41 21 13 2.2 1.7 28 5...... 6.8 7.9 7.1 33 17 35 42 53 12 2.4 1.7 13 6...... 9.0 6.0 11 32 15 39 38 47 10 2.7 1.8 6.8- 7...... 7.4 4.9 14 30 16 43 37 37 9.3 3.4 2.0 4.6 8...... 5.7 4.6 7.1 28 16 49 38 32 8.5 2.5 2.2 3.3 9...... 4.9 4.3 7.4 26 15 77 37 28 10 2.2 1.7 15 10...... 4.6 4.8 6.3 25 16 66 37 24 16 3.4 1.6 21 U...... 4.3 4.3 5.1 24 15 54 34 38 11 7.9 1.4 13 12...... 5.7 3.9 5.5 22 16 42 61 40 9.0 3.9 1.4 11 13...... 5.7 3.7 4.8 20 13 35 52 42 7.4 2.5 1.4 13 14...... 5.3 3.9 6,3 19 10 40 41 34 6.3 2.3 1.8 9.0 15...... 4.4 3.9 63 16 8.2 qc 35 30 5.5 2.0 1.7 6.8 16...... 3.9 3.9 55 13 9.0 37 35 25 4.9 11 1.6 7.4 17...... /3.7 4.3 51 13 14 36 79 25 4.6 7.4 1.6 7.1 18...... 3.3 10 47 . 13 38 66 47 4.6 i 1 3.7 19...:...... 3.2 30 43 12 14 43 52 42 4.6 2.9 5.7 4.3- 20...... 3.2 23 29 12 12 70 40 33 4.3 2.6 3.4 3.7 42" 21...... 6.5 14 17 12 9.0 62 34 4.1 2.2 2.5 3.7 22...... 5.1 12 13 12 9.0 58 30 103 3.7 3.2 2.0 3.4 23...... 4.6 10 35 12 8.8 45 28 113 3.2 38 1.8 6.3 24...... 4.3 9.3 39 50 8.5 42 27 78 3.2 42 1.7 6.3 25...... 3.9 8.5 74 52 8.2 IA 22 65 3.1 12 8.5 6.8 26...... 3.8 7.9 52 31 9.3 32 25 56 2.9 7.9 3.9 6.0 27...... 3.9 7.1 42 24 15 30 24 47 3.7 8.5 3.3 1 >i 28...... 3.7 7.9 28 18 24 190 24 37 4.6 6.3 3.2 o n 29...... 3.8 12 30 17 125 24 31 3.4 3.8 3.2 3.2 30...... 3>8 10 32 16 AC 20 25 2.9 3.2 3.4 0 Q< 31...... 5.7 34 16 62 21 2.5 6.0 1919-20. 1...... 2.7 13 47 8.5 6.8 7.6 130 74 20 29 12 3.2- 2...... 2.7 28 35 8.2 5.7 7.9 131 61 17 23 12 2.3 3...... 3.3 24 49 6.8 6.8 7.9 126 56 16 23 6.3 2.2 4...... 3.7 17 54 R 7 7.1 7.1 123 55 14 21 4.9 9 9 5...... 5.7 24 61 4.9 5.7 7.6 103 10 17 20 i a 2.0 6...... !. 6.3 37 33 5.7 10 8.5 145 52 20 19 3.1 . 2.7 7.,...... 7.9 27 20 7.1 10 15 98 44 48 17 2.9 2.5 8...... 5.3 21 33 6.3 10 25 85 45 39 16 2.8 2.7 9...... 4.3 17 qj 7.1 10 9"i 75 66 24 12 2.7 o R 10...... 8.5 16 54 7.4 7.9 25 70 65 22 10 2.7 2.9 11...... 7.1 16 AQ 7.4 8.5 oc 63 61 10 9.7 16 2.7 12...... 5.5 17 39 7.6 8.2 q9 62 HI 16 9.7 24 2.6 13...... 4.6 27 30 7.6 8.2 44 67 47 18 &5 11 6.0 14...... 4.3 37 32 7.9 7.1 76 162 42 15 7.9 9.0 9.7 15...... 5.3 28 41 7.4 7 Q 99 A.Q 15 7 O 7.4 6.8- fl' 16...... 5.3 40 7.4 7.6 79 90 38 26 7.1 13 5.3 17...... 10 17 34 7.1 7.6 78 75 33 32 6.5 32 4.6 18...... o ft 16 33 5.7 7.9 69 64 32 47 6.0 21 3.4 19...... 6.5 16 27 5.7 8.5 67 59 29 102 8.2 11 2.7 20...... :.... 5.7 12 22 7.1 8.2 *& 56 28 44 14 8.8 4.9 21...... 4.9 19 20 8.2 57 58 33 41 11 6.3 3.5 22...... 4.8 12 21 7.1 7.6 55 89 102 44 6.3 4.9 2.9 23...... 4.6 15 16 6.5 7.6 19 90 106 35 i O A q 2 7 24...... 4.3 16 13 7.1 7 Q fiQ 04 79 40 13 3.4 2,6 25...... ^ a 15 10 7.1 7 O 79 on 63 33 Q 7 2 7 2.2 66 ' 26...... 4.9 16 10 6.8 8.2 68 55 27 5.5 2.7 2 2 27...... 7 O 101 6.5 8.2 its 66 11 21 4.4 2.2 2.1 28...... 1O 70 8 7.1 7.4 1AQ Ol 37 18 3.7 2.2 2.2* 29...... 16 52 8 6.8 7.1 147 129 32 16 3.3 2 2 5.3 30...... 10 51 7 6.8 143 82 26 29 3.2 2.2 87 31...... 12 8.5 141 21 6.8 2.9 NOTE. Stage-discharge relation affected by ice Jan. 3-13,23, and Dec. 10-30,1919; discharge during these- periods based On gage heights corrected for effect of ice. 144 SURFACE WATER PART I. Monthly discharge of Moss Brook at Wendell Depot, Mass., for the yean ending Sept. 39, 1919 and 1920. [Drainage area, 12.2 square miles.] Discharge in second-feet. Run-ofl Month. Per in inches. Maximum. Minimum. Mfean. square mile, 1918-19. October...... 10 3,2 5,24 0.430 0.50 November...... 30 3.7 8.30 .680 .76 December...... 74 4.8 25.5 2.09 2.41 January...... 52 12 23.9 1.96 2.26 February...... 24 8.2 13.4 1.10 1.15 March...... 190 30 55,9 4.58 5.28 April...... 79 20 38.6 3.16 3.53 May...... ;...... 113 19 42.4 3.48 4.01 June...... 17 2.9 7,39 .606 ."62.68 July...... 42 2.0 6.53 .535 August...... 8.5 1.4 2.65 .217 .25 September...... 2.9 8.46 ,693 .77 The year...... 190 1.4 1.64 22.22 1919-20. October...... 19 2.7 6.35 .545 .63 November...... Jv...... 101 12 26.6 2.18 2.43 December...... 61 7.0 28.9 2.37 2.73 January...... 8.5 4.9 6.S8 .564 .65 February-...... 10 5.7 7.92 .649 .70 March.....:...... 155 7.1 59.7 4.89 5.64 April...... 162 56 91.4 7.49 8.36 May...... :...... ,...... 106 21 51.3 4.19 4.83 June...... 102 14 29.4' 2.38 2.66- July...... 29 3.2 .918 l.OS August...... 32 2.2 ; .641 vr*:- September...... 87 2.0 '.509 .57 The year...... 162 2.0 2.28 31.00 COSFNECTICTJT MVEB BASIN. 145 RCTMI AT caanr.Kitoyg. LOCATION. One mile below village of Charlemont, Franklin County. DRAINAGB ARBA. 462 square miles. RECORDS AVAHABLE. June 19,1913, to September 30,1920. GAGES. Friez water-stage recorder on left bank; referenced to gage datum by a hook gage inside the well; an inclined staff gage is used for auxiliary readings. Recorder inspected b^r Charles Haskins. DISCHARGE MEASUREMENTS, Made front cable or by wading. CHANNEL AND CONTROL. Channel covered with coarae gravel and boulders; fairly uniform section; control practically permanent. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder, for the year ending September SO, 1919, 12.27 feet at 7.30 a. m. March 28 (discharge, by extension of rating curve, 27,500 second-feet); minimum stage from water-stage recorder, 1.45 feet at 7. a m. August 3, (discharge, 42 second-feet). 'Maximum stage from water-stage recorder, for the year ending September 30, 1920, 10.04 feet at 4.30 p. m. April 13 (discharge, by extension of rating curve, 18,400 second-feet); miTijiniim stage during year, from water-stage recorder,!.44 feet at 11 a. m. Sept. 4 (discharge, 40 second-feet). 1913-1920: Maximum stage recorded, 15.7 feet on July 8, 1915 (discharge, by extension of rating curve, 45,000 second-feet); minimum stage recorded, 1.35 feet on September 21 and November 3,1914 (discharge, 23 second-feet). ICE. River usually frozen over during the greater part of the winter; ice jams occa sionally form below the gage causing several feet of backwater. REGULATION. Flow during low and medium stages largely ?egulated by a storage reservoir at Somerset, Vt. Several power plants above the station cause diurnal fluctuation. Monthly discharge corrected for storage at Somerset. ACCURACT. Stage-discharge relation practically permanent except when affected by ice. Rating curve well defined below 10,000 second-feet. The operation of the water-stage recorder was satisfactory except for short intervals as shown in the foot note to the daily-discharge table. Daily discharge October 1,1918, to January 4, 1919, March 7 to December 17,1919, and May 23 to September 30,1920, ascertained by use of discharge integrator; during remainder of years by applying rating table to mean daily gage height as determined from recorder sheets with correction for effect of ice during winter. Records good. Discharge measurements of Deerfield River at Charlemont, Mass., during (he years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1919. Feet. Sec.-ft. Dec. 13 0 <)A 343 2.38 416 1919. 1920. Jan. 21 .....do...... o3.22 318 Feb. 18 .....do...... a6.04 571 Feb. 16 171 .....do...... 2.42 457 17 .....do...... o3.63 170 Stage-discharge relation affected by ice. 102721 23 WSP 501 10 SURFACE WATER SUPPLY, 1919-3.920, PART I. Daily discharge, in see&nd-feet, of Deerfield River at Charlemont, Mass., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr; May. June. July. Aug. Sept. 1918-19. 1...... 310 720 180 620 260 1,150 1,120 520 360 245 . ... 265 140 2...... 350 550 400 3,000 90 1,800 880 1,260 530 250 230 420 3...... 340 240 360 2,000 340 1,350 890 1,320 .480 260 J, 70 1,300 4...... 330 400 375 1,100 310 1,050 1,000 800 430 155 200 1,480 5...... 500 550 340 480 260 1,250 1,X>40 5,400 450 94 220 540 6...... 1,160 550 335 500 195 2,000 1,500 1,920- 430 90 300 420 7...... 1,540 455 420 470 165 1,300 1,260 350 370 350 235 8...... 890 470 200 440 260 870 1,460 250 350 245 285 9...... 680 370 560 450 135 1,200 2,800 1,140 . 400 320 1» 2,350 10...... 600 350 350 310 175 2,650 2,400 980 450 375 64 1,620 11...... 580 440 400 390 195 1,750 2,250 1,980 360 510 235 1,000 12...... 430 365 410 260 260 1,100 6,000 2,350 305 400 270 1,300 13...... 360 385 455 370 310 960 2,800 2,300 285 102 280 2,100 14...... 385 380 580 430 260 810 1,900 1,520 310 260 325 1,100 15...... 350 360 3,450 310 440 610 1,520 1,100" 170 280 305 750 16...... 300 305 2,500 310 300 540 1,300 920 455 370 205 790 17...... 280- 186 1,310 310 210 780 1,980 1,600 395 260 74 640 18...... 250 1,740 710 370 260 890 2,300 3,900 350 270 285 560 19...... 280 2,100 670 210 195 1,500 1,600 1,980 i316 260 435 415 20. 265 1,530 605 430 340 1,800 1,180 1,320 350 96 600 380 21...... 1,230 1,080 560 580 185 3,000 1,230 1,360 320 210 200 22...... 1,040 . 870 460 540 180 2,850 960 13,700 132 375 250 520 23...... 550 660 2,550 430 145 2,200 850 5,200 330 550 330 1,530 24...... 435 455 2,300 720 340 1,950 600 2,500 295 215J iloo 25 520 425 3,200 780 260 1,750 570 1,740 285 230 830 910 26...... 420 350 2,300 560 370 1,650 630 1,440 280 300 355 750 27...... 275 435 1,340 440 155 2,100 550 1,160 590 105 278 430 28...... 330 230 950 500 920 14,000 740 900 380 230 240 310 29 285 580 465 310 2,600 650 740 130 260 280 470 30...... 380 450 690 270 2,050 610 600 210 270 160 415 01 680 620 175 1,550 445 290 102 1919-20. 1...... 450 1,700 2,000 570 175 500 4,050 1,640 270 375 310 355 2...... 430 2,250 1,220 400 340 400 4,450 1,640 330 365 330 210 3...... 490 1,900 860 435 340 310 3,950 1,520 400 295 325 205 4...... 405 1,240 130 135 530 285 2,950 1,500 310 300 260 118 5...... 325 1,740 660 215 465 370 2,950 1,450 440 195 235 100 6...... 640 1,560 560 530 530 710 3,550 1,220 1,000 345 200 215 7...... 1,040 1,140 580 530 530 680 1,840 1,240 900 340 170 325 8...... 670 970 840 570 175 790 1,250 1,230 690 275 91 350 9...... 540 790 1,100 530 500 680 960 2,250 520 235 220 310 10...... 800 980 2,200 500 710 600 870 1,650 450 220 250 445 11...... 1,040 770 1 ^Rrt 135 750 465 790 1,420 330 180 620 485 12...... 650 1,400 1,060 370 640 710 1,000 1,100 160 440 680 420 13...... 630 3,300 1,120 465 570 4,050 8,000 910 81 590 630 700 14...... 455 2,400 2,650 600 400 4,550 5,400 910 130 445 1,540 810 15...... 485 1,360 1 240 600 310 2,550 2,700 960 154 440 1,080 400 16...... 520 1,040 840 680 530 1,950 3,200 790 1,600 410 740 470 17...... 1,000 870 650 680 750 2,800 3,300 755 2,550 310 560 400 18...... 930 750 JQC 135 710 2,250 3,200 570 5,400 245 470 160 19...... 510 760 500 175 570 1,980 2,950 535 2,400 730 305 275 20...... 560 660 500 370 1,420 3,400 680 1,420 800 315 510 21...... 500 530 215 435 240 1,100 3,950 870 1,220 590 175 510 22...... 580 520 7QA 570 175, 960 4,150 1,250 1,240 530 120 440 23...... 670 425 960 600 215 1,150 4,250 980 1,020 530 330 405 24...... 540 910 710 640 340 2,050 5,200 850 750 540 310 265 25 440 640 91 i 135 260 3,550 2,750 790 540 340 310 190 26...... 270 920 C7fl 195 285 8,950 1,820 640 300 560 305 150 27...... 830 640 500 285 5,900 1,700 580 1 *\A. 500 430 300 28...... 1,420 2 500 91 Pi 570 155 5,000 4,450 560 405 455 145 420 90 1,700 1*430 465 500 17K 3 950 3,600 400 AAfL 475 100 435 30...... 1,100 2)700 370 3^650 2,150 255 495 255 530 31...... 1,040 640 370 3,650 250 400 235 NOTE. Stage-discharge relation affected by ice Jan. 5 to Mar. 5,1919, and Dec. 18,1919, to Mar, 25,1920; discharge for these periods based on gage heights corrected for effect of ice by discharge measurements, observer's notes, weather records, and comparisons with power-plant records at New England Power Co.'s plant No. 4 at Shelburne Falls. Water-stage recorder not in operation June 7-11 and Aug. 20-23. 1919, June 17-19, and Sept. 4-6, 1920; discharge for these periods estimated by comparison with power-plant records at Shelburne Falls. CONNECTICUT RIVER BASIN. 147 Monthly discharge of Deerfield River at Charlemont, Mass., for the years ending Sept. SO, 1919 and 1920. (Drainage area, 362 square miles.] Observed discharge in second-feet. Gain or Discharge without stor -loss in age (second-feet). storage at Somer Run-off Month. set, Vt. in inches. (millions Per square Maximum. Minimum. Mean. of cubic Mean. mile. feet). 1918-19. October...... 1,540 250 527 +138 579 1.60 1.84 November...... 2,100 186 599 +107 640 1.77 1.98 3,450 180 969 +127 1,020 2.82 3.25 3,000 175 583 + 64 607 1.68 1.94 920 90 268 -210 181 .500 .52 March...... 14,000 540 1,990 +475 2,170 5.99 6.91 April...... 6,000 550 1,590 +289 1,700 4.70 5.24 May...... 13,700 445 2,030 +350 2,160 5.97 6.88 June...... 530 130 344 -232 254 .702 .78 July...... 550 90 274 -335 149 .412 .48 830 64 269 -182 201 .555 .64 September...... 2,350 140 819 + 62 843 2.33 2.60 The year. . . 14,000 64 860 +653 881 2,43 33.06 1919-20. October...... 1,700 270 699 +162 759 2.10 2.42 November...... 5,400 425 1,450 +221 1,540 4.25 4.74 December,... 2,650 215 877 - 52 858 2.37 2.73 January...... 680 136 440 '-807 139 .384 .44 February...... 750 155 415 -713 130 .359 .39 8,950 285 2,199 +250 2,280 6.30 7.26 April...... 8,000 790 3,160 +736 3,440 9.50 10.60 May...... 2,250 250 1,010 +347 1,140 3.15 3.63 5,400 81 875 + 193 949 , 2.62 2.92 July...... 800 180 418 - 45 401 1.11 1.28 August...... 1,540 91 389 -166 327 .903 1.04 September...... 810 100 364 -108 322 .890 .99 The year. .. 8,950 81 1,020 + 18 1,020 2.82 38.44 NOTE. Increase or decrease of water held in storage at Somerset, Vt., during the month computed by engineers of the Geological Survey fuom data of storage increase or decrease furnished by the company operating the reservoir. WARE RIVER AT GIBBS CROSSING, MASS. LOCATION. Between highway and electric-railway bridges at Gibbs Crossing, three- quarters of a mile above mouth of Beaver Brook and 3 miles below Ware, Hamp shire County. DRAINAGE AREA. 201 square miles. RECORDS AVAILABLE. August 20, 1912, to September 30, 1920. GAGES. Gurley 7-day water-stage recorder on the right bank; referred to gage datum by a hook gage inside of well; an inclined staff gage is used for auxiliary readings. Recorder inspected by Marion G. Moore. DISCHARGE MEASUREMENTS . Made from the electric railway bridge or by wading. CHANNEL AND CONTROL. Channel rough and subject to a growth of aquatic vegeta tion during summer. Control free from weeds and at ordinary stages well defined at a section near the gage; shifts occasionally; at high stages the control is probably at the dam at Thorndike, 4 miles below the gage. EXTREMES OF DISCHARGE. Maximum stage, from water-stage recorder, for the year ending September 30, 1919, 5.50 feet at 4 a. m. March 2 (discharge, 2,570 second- feet); minimum stage, from water-stage recorder, 1.38 feet at 6 a. m. November 11, (discharge, 21 second-feet). 'Maximum stage from water-stage recorder for the year ending September 30, 1920, 6.00 feet at 10 p. m. March 27 (discharge, 2,820 second-feet); minimum stage, from water-stage recorder, 1.35 feet at 6 a. m. November 11 (discharge, 13 second-feet). 1912-1920: Maximum open-water stage recorded, 6.00 feet on March 27, 1920 (discharge, 2,820 second-feet); minimum stage recorded, 1.20 feet on October 26, 1914 (discharge, 5 second-feet). 148 SURFACE WATER SUPPLY, 1919-1920, PART I. ICE. River usually freezes over, and the stage-discharge relation is affected by ice during most winters. REGULATION . Flow affected by operation of mills at Ware, which at low stages causes a large variation in discharge on days when the mills are in operation, and a low discharge on Sundays and holidays. ACCURACY. Stage-discharge relation apparently permanent except when affected by ice. Rating curve well defined below 1,800 second-fe"et and fairly well defined between 1,800 and 2,700 second-feet. The operation of water-stage recorder was satisfactory except for period shown in footnote to daily-discharge table. Daily discharge ascertained by use of discharge integrator, with correction for effect of ice during winter. Records good. J Discharge measurements of Ware River at Gibbs Crossing, Mass., during the years ending Sept. 30, 1919 and 1920. Dis Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. 8ee.-ft. 1919. Feet. See.-/*. Oct. 15 2.74 364 Apr. 19 M. E. Stackpde...... 3.35 757 Dec. 17 3.38 704 24 3.18 682 26 2.42 239 1919. Dec. 12 H.S. Price...... 03.42 838 H. W. Fear...... 2.80 470 Feb. 21 J.W.Moulton...... 2.27 206 1920. Mar. 21 3.49 905 .....do...... 03.06 361 30 3.90 1 "WOT Feb. 3 M. R. Stackpole...... 03.86 321 30 .....dO...... :...... 3.90 1,360 o Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Ware River at Gibbs Crossing, Mass., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 305 130 184 300 315 1,540 1,000 305 315 144 46 108 2...... 255 90 220 750 275 2,200 890 425 340 146 55 195 3...... 255 65 210 1,020 295 1,280 770 485 290 142 52 375 4...... 260 144 165 730 300 930 760 400 255 31 115 1,120 5...... 210 124 160 530 235 780 760 500 245 28 90 794 6...... 215 106 184 530 265 850 730 530 230 49 90 486 7...... 265 94 154 480 245 770 790 450 180 154 92 323 8...... 290 92 86 425 155 660 760 395 180 168 67 300 9...... 220 61 225 390 170 730 710 360 220 144 63 340 10...... 230 22 156 370 200 1,180 720 325 280 158 33 430 11...... 205 23 170 1,000 680 410 295 168 85 390 12...... 110 104 180 320 165 790 700 580 270 104 85 402 is...... ;...... 86 140 156 300 120 650 720 615 215 59 85 367 14...... 200 110 160 270 135 560 750 570 144 150 59 255 15...... 200 245 180 dsn 630 490 144 132 59 300 16...... 138 86 870 280 210 450 670 420 192 146 27 315 17...... 136 46 650 270 215 530 1,060 380 174 138 27 245 18...... 130 390 450 235 190 640 1,180 480 164 112 95 185 19...... 77 720 340 230 180 860 960 520 140 SO 120 195 20...... 40 560 300 230 104 1,000 850 435 120 192 108 160 21...... 172 415 240 220 100 950 800 440 98 230 108 152 22...... 180 340 240 ' 210 102 850 710 910 38 240 80 170 23...... 170 270 370 210 150 830 640 1,380 134 210 67 267 24...... 140 210 510 460 305 780 600 1,200 140 200 30- 283 25...... 108 220 570 470 290 660 620 1,020 118 200 167 300 26...... 83 265 700 480 465 600 540 860 112 130 227 263 27...... 50 210 500 480 610 560 390 700 130 130 164 195 28...... 135 140 400 470 500 880 410 570 106 190 122 152 29...... 130 240 330 430 1,580 355 480 42 150 100 173 30...... 130 174 340 390 1,420 315 400 120 160 54 216 31...... 130 310 370 ...... 1,280 420 90 108 CONNECTICUT BIVEB BASIN. Daily discharge, in second-feet, of Ware River atGibbs Crossing, Mass., for the years ending- Sept. 30, 1919 and 1920 Continued. , Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. Jnly. . Aug. Sept. 1919-20. 1...... 184 203 860 320 125 220 1,760 950 295 210 50 95- 2...... 150 530 710 300 155 220 1,670 820 255 170 140 aw 3...... 154 810 600 270 155 185 1,760 695 255 125 95 80' 4...... 102 580 485 250 125 170 1,510 672 220 245 90 60s 5...... 100 590 415 9M\ 155 220 1,460 700 285 295 90 55- 6...... 176 750 385 220 170 380 1,650 645 695 250 90 28. 7...... ISA 660 375 185 125 450 1,420 550 630 225 60 70- 8...... 200 530 Of, 34fl 155 450 1,230 480 480 190 40 90- 9...... 158 430 510 220 220 425 990 710 400 150 100 80- 10...... 152 420 Qflft 200 ififl 450 780 830 320 85 96 100 11...... 108 390 880 185 170 475 700 650 290 103 120 95 12...... 140 370 670 200 185 590 650 550 225 160 220 95 13...... 131 435 620 220 17ft 900 710 520 255 175 ISO 1«5 14...... 200 620 670 200 170 1 220 1,150 510 295 180 130 150 15...... 170 560 660 185 185 1,290 960 450 240 160 170 130 16...... 170 44fl 4QD IRC 220 1.180 800 440 166 140 120 17...... 174 440 441 125 200 1,680 730 440 230 125 19ft 95 18...... 134 415 375- 155 ISfi 1,940 635 380 970 125 190 55 19...... 164 390 380 200 18S 1,600 548 330 880 239 200 28 20...... 200 345 470 185 185 1,200 520 320 730 275 180 60 21...... 220 320 530 170 112 onn 510 350 570 255 95 100* 22...... 174 275 590 1S5 140 805 730 748 59S 225 95 95- 23...... 154 275 205 1S5 170 945 795 1,120 490 190 155 60* 24...... 150 325 255 112 255 1,350 1,080 840 390 133 115 55. 25...... 96 315 240 140 200 1,820 960 650 346 17* 98 35> 26...... 114 415 396 220 186 2,300 796 550 270 200 65 35 27...... 154 1,220 220 220 200 2,700 645 450 210 185 55 85 28...... ion 1,360 200 200 200 2680 855 410 235 145 as 80 29...... 200 920 255 185 185 2,470 1,440 295 275 125 38 90 30...... 245 fun 340 1S5 3,310 1 200 300 205 100 160 215 31...... 235 295 100 3,040 305 50 125 NOTE. Daily discharge Jan. 21-27,1919, estimated by means of hydrograph comparisons with records in adjacent drainage basins. Stage-discharge relation affected by ice Jan. 10-14, 1919, and Jan. 2 to Mar. 14, 1920; discharge Tor these periods based on gage heights, discharge measurements, observer's notes, weather records, and comparisons with records in adjacent drainage basins. Monthly discharge of Ware River at Oibbi Crossing, Mass., for tbe years enmng Sept. 30, 1919 and 1920. [Drainage area, 201 *quare miles.] Dischargeinseeond-feet. Month. Per BfflHOff Maximum. Minimum Mean. square in inches. mile. 1918-19. October...... 305 40 17& a 846 0.98 720 22 191 .950 1.06 December...... 870 86 329 1.61 1.8T 1,020 210 401 2.00 2.31 February...... 610 100 237 1.18 1.2$ March..... __ ...... 2.200 450 912 4.54 5.23. April...... 1,180 315 716 3.56 3.97 May...... 1,380 305 563 2.80 3.2$ June...... 340 38 181 .900 1.00> July...... 240 28 141 .701 .81 227 27 86.5 .430 .50- September...... 1,120 108 315 1.57 1.75 2,200 22 354 1.76 23.94, 1919-20. October...... 245 96 165 .821 .94- 1,360 206 539 2.68 2.99- December...... 900 200 479 2.38 2.7* 340 100 203 1.01 1^16 February...... 255 112 175 .871 .94. March...... 2,700 170 1,150 5.72 6.59> April...... 1,760 510 1,020 5.08 5..67T Mfiv 1,120 295 570 2.83 3.26> 970 160 392 T OS 2 1fL July...... 295 50 175 .871 1.00' 220 35 116 .572 .66 215 28 85 .423 .47 THp xrflar 2,700 28 424 2.11 28.60- 150 SURFACE WATER SUPPLY, 1919-1920, PART I. SWIFT RIVER AT WEST WARE, MASS. LOCATION. About 1,000 feet below old wooden dam opposite West Ware station of Boston & Albany Railroad, Hampshire County, 6 miles downstream from Enfield and 3 miles below confluence of East and West branches of Swift River. DRAINAGE AREA. 186 square miles. RECORDS AVAILABLE. July 15, 1910, to September 30, 1920. GAGES. Gurley 7-day water-stage recorder on left bank; referenced to gage datum by a hook gage inside of well; an inclined staff is used for auxiliary readings. A Barrett & Lawrence water-stage recorder was used from August 25, 1912, to April 17, 1919. Prior to August 25, 1912, a chain gage on footbridge 600 feet up stream from the present station was used. Recorder inspected by H. C. Davis. DISCHARGE MEASUREMENTS. Made from cable or by wading. CHANNEL AND CONTROL. Gravel and alluvial deposits; some aquatic vegetation in channel during summer. Control has shifted slightly at tiines, the greatest change occurring during the high water of April 3,1916, when dam above the gage was washed out; at high stages the control is probably at the dam at Bondsville, 4 miles below the gage. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder, for the year ending September 30, 1919, 6.48 feet at noon March 30 (discharge, 1,350 second- feet); minimum stage, from water-stage recorder, 1.90 feet at 4 a. m. October 29 (discharge, 71 second-feet). Maximum stage for the year ending September 30, 1920, from water-stage re corder, 8.95 feet at 6 p. on. March 28 (discharge, by extension of rating curve, 2,340 second-feet); minimum stage, from water-stage recorder, 2.10 feet at 1 a. m. September 28 (discharge, 93 second-feet). 1910-1920: Maximum discharge recorded, 2,340 second-feet (by extension of rating curve) on September 28, 1920; minimum discharge recorded, 22 second- feet on September 22, 1914. ICE. River%sually freezes over, and the stage-discharge relation is affected by ice for short periods during most winters. REGULATION. Operation of mills at Enfield 6 miles above the station affects distribu tion of flow at low and medium stages, but has only a slight affect when the mean daily discharge exceeds 200 second-feet. ACCURACY. Stage-discharge relation changed during high water of March, 1920. Rating curves used are fairly well defined below 1,500 second-feet. The opera tion of water-stage recorder was satisfactory except for short periods as shown in footnote to daily-discharge table. Daily discharge ascertained by applying rating table to mean daily gage height determined by inspection of gage-height graph, with correction for effect of ice during -venter. Records good. Discharge measurements of Swift River at West Ware, Mass., during the years ending Sept. SO, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1919. Feet. Sec.-ft. Dec, 17 4.09 518 Apr. 17 4.62 629 July 1 .....do...... 2.34 132 1919^ Feb. 22 J.W.Moulton, ...... 2.32 143 1920. Mar. 12 K.H.Suttie...... 4.84 765 H.S. Price...... a2.68 170 21 M.R. Stackpole...... 02 785 Feb. 4 .....do...... 2.91 242 21 .....do...... 5.02 767 Apr. 29 M. R. Stackpole...... 5.60 988 30 .....do...... 6.44 1,340 July 16 Pierce and Lamson .... 2.67 185 30 .....do...... 6.44 1,320 Stage-discharge relation affected by ice. CONNECTICUT: RIVER BASINV 161 Daily discharge, in second-feet, of Swift River at West Ware, Mass., for the yean endwlgr Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 270 97 172 303 263 620 1,080 453 392 132 164 139 2...... 226 94 164 453 252 775 930 478 369 129 168 140 3...... 1% 94 156 584 241 .930 820 504 347 127 154 325 4...... 178 101 158 598 240 790 810 530 325 120 142 504 5...... '. 156 92 151 504 220 670 810 543 314 116 129 478 6...... 156 113 147 453 220 612 760 570 303 129 121 404 7...... 154 110 142 416 215 612 760 570 292 151 121 314 8...... 144 106 140 404 196 584 730 543 265 134 110 266 9...... 129 98 146 358 184 556 715 504 259 124 106 255 10...... 120 97 144 340 174 675 700 478 303 126 91 314 11...... 108 103 160 320 180 775 612 478 325 142 110 314 12...... 108 106 140 310 174 745 598 504 325 132 110 314 13...... 110 104 142 300 147 670 612 530 303 132 100 294 14...... 120 98 156 290 153 598 612 556 270 127 103 266 15...... 115 110 314 270 164 540 612 543 248 120 106 237 16...... 110 112 504 260 166 504 598 517 237 130 104 228 IT...... 112 106 556 250 162 504 598 491 215 132 88 222 18...... 107 184 491 240 166 517 1,120 517 205 127 115 205 19..:...... 103 325 392 230 162 598 825 530 200 168 115 184 20...... 95 392 325 230 156 715 790 504 184 166 104 147 21...... 109 358 292 223 142 790 730 478 178 137 103 151 22...... 107 314 254 219 137 790 670 612 176 146 104 144 23...... 116 263 314 215 137 775 626 930 168 190 103 174 24...... 106 226 423 416 147 715 598 1,160 162 248 94 215 25 106 194 530 517 153 670 570 1,040 162 226 110 201 26...... 97 178 598 530 270 626 584 860 158 192 147 203 27...... 98 160 556 478 325 598 530 730 151 178 120 186 28...... 106 142 478 404 314 640 491 640 144 160 110 164 29...... 94 151 392 358 965 478 584 135 140 90 160 30...... '...... 97 162 314 336 1,320 466 504 137 137 80 159 31...... 100 292 314 1,240 440 134 80 1919-20. l..~...... i56 . 190 860 237 165 155 1,680 900 288 977 178 1OQ 2...... 151 325 775 230 175 155 1,640 860 277 266 - 167 136 3...... 153 428 655 220 200 155 1,720 730 266 266 156 131 4...... 146 453 543 210 230 155 1,640 655 255 266 143 125 5...... 1Q7 478 453 200 220 185 1 W» 655 QII OKK 138 119 6...... 142 504 392 195 220 350 1,600 626 542 239 128 116 7...... 137 465 380 190 200 420 1,350 598 598 220 121 107 8...... 137 428 380 185 195 400 1,150 570 570 204 118 110 9...... 130 380 440 155 175 400 1,050 670 486 192 113 109 10...... 137 336 612 160 175 390 960 700 407 1% 107 122 11...... 142 303 715 160 165 450 790 685 334 184 145 128 12...... 134 292 670 160 185 530 740 640 300 182 169 138 13...... 126 336 612 160 160 790 860 570 277 188 138 148 14...... 137 428 612 170 160 1,040 1,080 528 266 188 135 14B 15...... 142 440 584 180 155 1,080 1,280 528 186 173 150 16...... 147 416 504 170 165 1,080 1.100 514 188 212 150 17...... 160 358 440 155 165 1,360 860 459 370 178 255 148 18...... 164 336 440 170 145 1,360 825 446 760 173 290 138 19...... 164 314 420 160 155 1,320 700 407 930 178 310 128 20...... 166 281 400 160 165 1,160 640 382 860 196 310 122 21...... 160 254 390 155 155 985 620 433 760 180 300 113 22...... 160 243 380 175 145 760 640 612 685 171 266 110 23...... 154 243 360 150 145 745 720 775 570 167 239 109 24...... 149 243 340 155 145 860 960 825 500 171 190 106 25...... 139 248 320 165 155 1,350 920 745 420 164 173 106 26...... 129 314 300 190 165 1,850 SAft 626 358 165 165 104 27...... 132 626 290 160 165 2,300 820 528 323 167 160 100 28...... 154 895 270 180 155 2,320 1,000 446 288 180 156 O4 29...... 170 930 259 200 145 2,240 1,200 3Q1 277 180 153 98 30...... 186 860 250 170 2,040 1,100 346 277 169 14fi 248 31...... 184 240 170 1,840 311 167 141 NOTE. Daily discharge Oct. 8-11,1918; Feb. 4-11; Mar. 1,15; Apr. 2-5; Aug. 25-31,1919; Mar. 25-27, and Aug. 18-21, 1920, estimated by hydrograph comparisons with records in adjacent drainage basins. Stage-discharge relation affected by Ice Jan. 10-19, Dec. 18-27,1919, and Jan, 2 to Mar. 11,1920; discharge for these periods based on gage heights, discharge measurements, observer's notes, weather records, and comparison with records in adjacent drainage basins. 152 SUBFACE WATER SUPPLY , PART I. Monthly discharge of Swift River at West Ware, Mass., for the years ending Sept.. 30, 1919 and 1920. x [Drainage area, 186 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 270 94 128 0.79 November...... 392 92 160 .96 December. 140 1.59 1.83 January... 215 1.93 Z22 February...... 325 137 195 1.05 1.09 March...... 1.320 504 714 3.84 4.43 A-pril...... 1,120 466 695 3.74 4.17 1,160 440 591 3.18 3.67 June...... 392 135 242 1.30 1.45 July...... 248 116 147 .790 .91 August...... 168 80 113 .608 .70 S«ptember...... 504 144 244 1.31 1.4S The year...... __ 1,320 324 1.74 23.68 1919-20. October...... 186 136 149 .801 .92 November...... 930 190 412 2.22 2.48 December...... 860 240 461 2.48 2.86 January...... 237 ISO 177 .952 1.10 February...... 230 145 171 .920 .99 March...... 2.300 155 974 5.24 6.04 April...... 1,720 620 1.070 5.75 6.42 May...... 900 an 586 3.15 3.63 June...... 930 255 436 2.34 2.61 Jv&y...... 277 164 197 1.06 1.22 August...... 310 107 180 .968 1.12 September...... 248 94 127 .78 Theyear...... 2,300 94 412 2.22 30.15 CONNECTICUT BIVER BASIN. 15S QtTABOAO RIVER AT WEST BRXMFXELD, MASS. LOCATION. At two-span highway bridge near West Brimfield station of Boston & Albany Railroad, in Hampden County, one-third mile above mouth of Blodgett Mill Brook. DRAINAGE AREA. 150 square miles. RECORDS AVAILABLE. August 23,1909, to September 30,1920. GAGE. Gurley 7-day water-stage recorder at downstream end of center pier of bridge, referred to gage datum by means of a hook gage inside the well; a vertical staff on upstream side of right abutment of bridge is used for auxiliary readings. Recorder inspected by Mrs. G. G. Alien. DISCHARGE MEASUREMENTS. Made from highway bridge or by wading near bridge. CHANNEL AND CONTROL. Stream bed covered with boulders, gravel, and alluvial deposits; slight shifts in control have occurred at various times. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder, for the year ending September 30, 1919, 4.46 feet at 11 a. m. March 1 (discharge, 1,360 second-feet); minimum stage, from water-stage recorder, 1.68 feet at 3 a. m. August 21 (discharge, 16 second-feet). Maximum open-water stage, from water-stage recorder, for the year ending September 30, 1920, 5.3 feet at noon March 17 (discharge, by extension of rating curve, 1,980 second-feet); a stage of about 5.5 feet occurred on March 14, but the channel was obstructed by ice at the time; minimum stage, from water-stage- recorder, 1.95 feet at 12 p. m. September 9 (discharge, 47 second-feet). 1909-1930: Maximum open-water stage recorded, 5.3 feet at noon March 17r 1920 (discharge, 1,980 second-feet); minimum, stage recorded, 1.40 feet on Sep tember 17 and 18, 1910 (water held back by dams) (discharge, 2.5 second-feet). ICE. River usually freezes over, and the stage-discharge relation is affected during most winters. REGULATION. Flow affected by operation of power plants at West Warren, 3 miles: above station, which at low stages causes a large variation in discharge on days when the mills are in operation and a low discharge on Sundays and holidays. ACCURACY. Stage-discharge relation remained unchanged except for period of slight ice effect. Rating curve well defined below 1,300 second-feet. Operation of water-stage recorder was satisfactory throughout both yearo, except for short pe riods as indicated in footnote to daily-discharge table. Daily discharge October 1,1918, to October 20,1919, ascertained by use of discharge integrator, and from October 21,1919, to September 30, 1920, by applying rating table to mean daily gage height as taken from record sheets, with correction for ice during winter.. Records good. Discharge measurements of Quaboag River at West Brimfield, Mass., during the yean ending Sept. 30, 1919 and WHO. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge, 1918. Feet. Sec.-ft, 1919. Feet. 8ec.-ft. Dec. 18 2 no 322 Apr. 21 3.34 57fr 18 .... .do...... 2.79 270 Nov. 25 H. S Price...... 2.77 27J 1919. 1920. Jan. 6 H.W; Fear...... o3.29 442 Jan. 7 .....do...... 04.73 215 6 .....do...... 03.12 361 Feb. 3 . ....do...... o4.18 18* Feb. 22 J.W.Moulton...... 2.46 167 Mar. 25 M.R. Stackpole ..... 4.23 1,250- Mar. 22 M. R. Stackpole...... 3.44 630 July 16 Pierce and Lamson.... . 2.72 253 31 .....do...... 3.73 810 Sept. 2 2.31 114 « Stage-discharge relation affected by ice. 154 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Qiwhoag River at West Brimfield, Mass., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 134 100 104 225 225 800 740 320 290 108 154 110 2...... 134 65 116 350 260 800 700 360 260 106 126 116 3...... 152 69 116 370 295 730 700 355 255 100 116 300 4...... 1>S9 100 355 325 700 680 360 235 80 130 415 5...... 120 96 108 300 230 680 640 355 215 84 112 300 6...... 116 % 62 340 215 680 610 335 200 94 120 305 7...... 138 72 H7 360 200 660 590 335 178 114 100 300 ,8...... 130 84 W 280 240 610 550 280 170 120 100 280 9...... 120 92 80 280 178 660 530 300 172 110 62 300 10...... 120 67 00 230 205 700 510 290 154 166 72 300 11...... 116 80 go 230 215 700 480 325 144 164 80 295 12...... 84 96 on 230 :205 630 490 305 140 134 70 345 13...... 84 88 100 230 205 610 455 325 130 120 72 325 14...... 114 80 110 220 188 580 420 320 126 126 76 320 15....:..."...... 110 76 I'M 220 180 550 390 290 126 130 62 310 16...... 110 60 225 144 510 445 295 130 140 46 280 17...... % 78 225 210 124 490 610 305 100 130 52 260 18...... 99 198 210 162 550 590 340 104 124 86 245 19...... 74 188 240 200 134 610 590 300 96 140 76 230 -20...... 70 170 too 200 120 640 580 295 88 130 70 225 21...... 110 160 166 188 144 610 580 295 96 130 70 230 .-22...... 92 154 152 188 144 600 510 520 96 148 70 210 23...... 96 126 178 152 RQn 490 550 96 205 54 . 290 24...... 99 134 190 395 144 550 460 550 84 215 62 285 .25...... 96 124 OETl 280 166 530 410 550 86 IQfi 114 300 .26...... 80 120 ' 9JU\ 420 295 520 390 510 88 164 100 300 27...... 69 120 97ft 425 280 485 365 460 96 154 100 290 28...... 92 136 240 415 280 740 365 420 104 152 94 280 29...... 88 144 94n 390 700 325 390 100 148 90 260 .30...... q-i 84 120 245 360 800 300 360 104 144 80 245 Qfi QQfl 305 780 325 . 144 100 1919-20. 1...... 255 181 KM 175 115 64 1,350 726 335 266 15S 107 2...... 235 340 180 155 54 1,350 684 306 234 153 103 3...... 250 320 516 195 180 64 1,290 677 274 278 147 99 4...... 225 286 dfin 220 92 54 649 262 290 136 94 5..:...... 215 378 420 260 115 140 I'iso 635 345 250 131 103 6...... 225 378 Q7A 220 140 420 1,130 600 408 246 129 99 7...... 215 384 360 165 165 340 1,120 558 230 116 103 8...... 200 372 366 155 150 270 1,060 364 360 213 124 99 g 205 366 XAQ 165 155 270 992 628 350 203 129 94 ao...... 210 360 504 155 155 290 943 546 315 213 116 110 11.;...... 205 335 '111 140 140 360 887 546 294 190 172 136 12...... 194 325 Kf\A 140 140 540 817 546 274 238 175 129 J8...... 184 OArt COO 165 140 1 1 vi 852 552 266 230 169 121 14...... 180 372 528 140 140 1 450 831 552 230 203 184 116 15...... 194 360 498 125 155 1^650 810 540 227 193 178 116 16...... 190 335 320 115 145 1,890 775 498 220 190 184 116 17...... 205 310 VM\ 140 160 1,870 733 474 420 172 181 114 18...... 194 310 320 140 165 1,250 677 432 656 166 178 107 19...... 184 310 OAfl 140 155 1,100 600 420 582 213 163 112 ^0...... 180 310 qofl 140 1 000 576 402 510 206 112 21...... 175 290 420 165 140 1 000 594 414 534 190 139 107 22...... 166 270 420 165 115 1*100 621 570 534 184 142 105 23...... 163 262 420 140 115 1,120 642 558 492 172 139 103 24...... 155 262 OOft 14/1 115 Ij220 691 546 468 190 129 103 25...... 1VI 254 165 1^260 663 552 426 tQ7 129 94 .26...... 142 360 195 155 105 1,370 656 534 372 181 124 105 27...... 142 621 195 14fi 105 1,430 649 510 345 161 114 105 28...... 172 564 165 125 82 1 430 740 480 302 155 110 96 29...... 158 EKO 195 125 64 l' 440 754 438 278 153 114 OQ 30...... 166 576 195 115 1*430 719 414 278 147 119 213 31...... 175 91 A 115 1,390 366 144 110 NOTE. Stage-discharge relation affected by ice Jan. 5-18,1919, and Dec. 17,1919, to Mar. 15, 1920; dis- - charge for these periods based on gage heights, corrected for effect of ice by means of discharge measure ments, observer's notes, and weather records. Discharge Dec. 7-15, 19,20, 1918, Nov. 10,11, 17-21, and .Dec. 4-6, 1919, estimated by hydrograph comparison with Swift, Ware, and Quinnebaug rivers. CONNECTICUT BIVER BASIN. 155 Monthly discharge of Quaboag River at West Brimfield, Mass., for the years ending Sept. SO, 1919 and 1920. [Drainage area, ISO square miles.] Discharge in second-feet. Run-off in Month. Per inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 152 69 x 106 0.707 . 0.82 198 60 110 .733 . .82 280 57 161 1.07 1.23 425 178 284 1.89 2.18 325 120 202 1.35 1.41 March...... 800 485 639 4.26 4.91 740 300 516 3.44 3.84 May...... 550 280 365 2.43 2.80 290 84 142 .947 1.06. July...... 215 80 136 .907 1.05 154 46 87.6 .584 .67 415 110 275 1.83 2.04 800 46 252 1.68 22.83 1919-20. 255 142 191 1.27 1.46 621 181 357 2.38 2.66 558 165 370 2.47 2.86 260 115 166 1.04 1.20 180 64 134 .8% .96 1,890 54 917 6.11 7.04 April...... 1,350 576 866 5.77 6.^44 ifvy...... 726 364 529 3.53 4.07 656 220 368 2.45 2.73 July...... 290 144 203 1.35 1.56 184 110 143 .953 1.10 213 94 111 .740 .82 The year...... 1,890 54 363 2.42 32.89 WESTFIELD RIVER AT KNIGHTVILLE, MASS. LOCATION. At single-span steel highway bridge known locally as Pitcher Bridge in Knightville, Hampshire County, 1 mile north of outlet of Norwich Lake and 3 miles above confluence with Middle Branch of Westfield River. DRAINAGE AREA. 162 square miles. RECORDS AVAILABLE. August 26, 1909, to September 30, 1920. GAGE. Chain attached to downstream side of highway bridge; read by J. A. Burr. DISCHARGE MEASUREMENTS. Made from highway bridge or by wading. CHANNEL AND CONTROL. Channel rough, covered with boulders and ledge rock; control practically permanent. EXTREMES OP DISCHARGE. Maximum stage recorded, for the year ending Septem ber 30, 1919, 9.2 feet at 7 a. m. May 22 (discharge, by extension of rating curve, 6,970 second-feet); minimum stage recorded, 1.00 foot on August 5, 12, and 13 (discharge, 32 second-feet). Maximum stage for the year ending September 30, 1920, 8.98 feet during the evening of April 13 (determined from high-water marks) (discharge by extension of rating curve, 6,730 second-feet); minimum stage recorded, 0.94 foot at 5 p. m. September 29 (discharge, 28 second-feet). 1909-1920: Maximum open-water stage recorded, 9.2 feet on May 22, 1919 (dis charge, by extension of rating curve, 6,970 second-feet); a gage height of 9.4 feet was recorded at 9.15 a. m. January 22,1910, but channel was probably obstru|^ed by ice at that time; minimum stage recorded, 0.60 foot on August 10, 1913 (dis charge, 4 second-feet.) 156 SURFACE WATER SUPPLY, 1919-1920, PART I. ICE. Ice usually forms in the river early in the winter and seriously affects the stage-discharge relation. REGULATION. Flow not seriously affected by regulation. ACCXJBACY. Stage-discharge relation practically permanent except when affected by ice, although individual discharge measurements have at times appeared erratic; the rough and irregular channel causes difficulty in obtaining accurate discharge measurements. Rating curve fairly well defined below 2,500 second-feet. Gage read to hundredths twice daily, except from January 1 to March 16,1920, when it was read once daily. Daily discharge ascertained by applying rating table to mean daily gage height, with correction for effect of ice during winter. Records good. Discharge measurements of Westfield River at Knightville, Mass, during the years ending Sept. SO, 1919 and 1920. Dis Gage Dis Date. Made by &, charge. Date. Made by charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Feb. 19 J. W. Moulted... a 1.63 101 Jan. 8 M. R. Stackpole...... a 1.92 106 Mar. 20 3.27 792 28 H. S. Price...... a2.21 109 29 3.77 1,170 Apr. 27 .....do...... 3.07 660 Apr. 23 .... . a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Westfield River at Knightwlle, Mass., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June July Aug. Sept. 1918-19. 1...... 106 95 151 275 115 1,050 512 210 240 59 40 54 2...... 108 89 141 1,050 140 780 485 435 210 52 47 73 3...... 100 79 160 485 145 568 390 370 188 45 40 715 4...... 93 73 14* 380 125 435 568 310 275 43 36 568 &...... 89 99 125 225 115 595 655 715 202 40 34 225 "6...... 109 113 110 210 120 910 780 485 163 49 41 139 7...... 168 102 115 175 115 540 71*5 390 148 70 «4 100 8...... 136 95 195 200 105 460 655 330 134 73 67 95 9...... 102 95 145 185 98 780 715 275 163 46 50 292 10...... 106 102 125 185 OS 1,200 625 330 210 65 38 330 11...... 89 99 110 165 Oil 625 655 1,360 173 1S6 36 240 12...... ss 99 100 156 CO 512 I qfin 1 J 7Rn440 1 Day. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May. Jane. July. Aug. Sept. 1919-20. 1...... 70 240 625 130 52 39 1,780 TW lid 210 126 37 2...... 73 780 390 125 56 40 1,870 623 113 MS 86 37 3...... 130 412 310 115 60 36 1,780 540 109 258 61 37 4...... 109 258 210 115 5$ 3ft 1,600 485 «6 249 55 37 8...... - 104 910 205 110 98 50 2,050 4J*S 310 163 50 35 6...... 113 .655 202 115 47 310 2,050 390 655 146 51 34 7...... 109 412 275 110 88 860 1 '»10200 370 330 117 44 . 38 8...... 100 350 310 100 go 72ft 350 202 102 38 37 9...... 95 292 390 125 32 720 655 685 165 92 40 32 M»...... 194 258 1,120 105 100 786 595 1918-19. 168 68 96.3 0.594 0.68 1,050 73 174 1.07 1.19 1,780 96 350 2.16 2.49 1,050 110 232 1.43 1.65 210 66 118 .728 .76 March ...... 3,450 240 754 4.65 5.36 April...... 1,360 240 554 3.42 3.82 May...... 5,050 210 810 5.00 5.76 June...... 275 59 128 .790 .88 July...... 540 40 97.7 .603 .70 310 32 70.5 .435 .50 715 54 174 1.07 1.19 5,050 32 298 1.84 24.98 1919-20. 310 70 141 .870 1.00 2,330 163 476 2.94 3.28 1,120 130 286 1.76 2.03 130 50 86.2 .532 .61 100 36 65.0 .401 .43 2,330 36 1,080 6.67 7.69 April...... 3,560 595 1,410 8.70 9.71 750 132 366 2.26 2.61 2,140 95 320- 1.97 2.20 July...... 255 39 106 .654 .75 412 37 122 .753 .87 275 28 69.7 .430 .48 The year ...... 3,560 28 377 2.33 31.66 158 SURFACE WATER SUPPLY, 1919-1920, PART I. WESTFIELD RIVER NEAR WESTFIELD, MASS. LOCATION. At Trap Eock Crossing, 3 miles east of Westfield, Hampden County, 1 mile below mouth of Big Brook, and 2 miles below mouth of Westfield Little Eiver. DRAINAGE AREA. 496 square miles. RECORDS AVAILABLE. June 27, 1914, to September 30, 1920. GAGE. Stevens continuous water-stage recorder on right bank, referenced to gage datum by means of a hook gage inside the well; an inclined staff gage is used for auxiliary readings. Recorder inspected by C. L. Pierce and Andrew Kelly. DISCHARGE MEASUREMENTS. Made from cable or by wading. CHANNEL AND CONTROL. Bed covered with gravel and alluvial deposits; riffle of" boulders about 200 feet below gage forms control at low and medium stages. At high stages control is probably formed by crest of storage dam at Mittineague, 3 miles below the station. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder, for the year ending September 30,1919,17.4 feet at 10.30 a. m. May 22 (discharge, by extension of rating curve, 17,400 second-feet); minimum stage, from water-stage recorder, 3.24 feet from 7 p. m. September 1 to 2 a. m. September 2 (discharge, 106 second- feet). Maximum stage from water-stage recorder, for the year ending September 30, 1920, 17.6 feet at 9 p. m. April 13 (discharge, by extension of rating curve, 16,800' second-feet); minimum stage, from water-stage recorder, 3.30 feet 12.15 a. m. September 28 (discharge, 124 second-feet). 1914-1920: Maximum stage recorded, 17.4 feet o^August 4, 1915, and May 22, 1919 (discharge, by extension of rating curve, 17,400*second-feet); minimum stage- recorded, 3.02 feet on September 24,1914 (discharge, 46 second-feet). ICE. Stage-discharge relation slightly affected by ice for short periods during most winters. DIVERSIONS. Water is diverted from Westfield Little River and carried to Springfield for municipal use. Monthly discharge corrected for diversion. REGULATION. There are several power plants above the station, but the diurnal fluctuation is small; the nearest dam is at Westfield. ACCURACY. Stage-discharge relation practically permanent, and probably not affected by ice during winters of 1918-19 arid 1919-20. Rating curve well defined be tween 60 and 7,500 second-feet. The operation of the water-stage recorder was satisfactory except for periods shown in footnote to daily-discharge table. Daily ' discharge ascertained by application of rating table to mean daily gage height, as determined from recorder sheets. Records good. Discharge ineasurements of Westfield River near Westfield, Mass., during the years ending- Sept. 30, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by ». charge. 1919. Feet. Sec.-ft. 1920. Fed. Sec.-ft. Apr. 22 5.21 1 '900140 8.01 3,680 26 .....do...... 4 89 3.45 158 July 1 B. L. Bigwood...... 3.75 290 COSrNEOTICtTT EIVER BASIN. Daily discharge, in second-feet, of Westfield River near Westfield, Mass., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. ' « 1...... 370 292 455 554 530 2,700 1,620 692 768 326 225 121 2...... 350 322 377 1,760 405 2,100 1,410 1,400 738 177 21S 214 3...... 325 206 391 1,590 425 1,780 1,400 1,260 660 225 258 698 4...... 300 ' 229 405 1,180 445 1,480 11,560 938 588 237 188 1,810 5...... 300 313 391 780 405 1,800 1,760 1,410 632 156 174 792 6...... 325 283 358 768 382 2,420 1,940 1,230 535 174 202 480 7...... 425 313 218 732 396 1,560 1,920 938 460 336 233 305 B...... 385 249 262 768 340 1,190 1,840 853 400 367 199 331 9...... 350 300 386 694 283 1,590 1,760 762 485 221 266 405 10...... 325 210 435 648 358 2,600 1,740 892 535 233 287 786 11...... 300 170 300 687 283 1,700 1,830 3,060 520 304 150 610 12...... 300 237 300 599 292 It550 2,600 2,480 480 344 153 560 13...... 330 292 335 615 245 1,250 2,030 2,660 386 250 153 510 14...... 370 262 840 530 340 840 1,590 1,770 296 184 177 405 15...... 349 229 2,100 621 410 900 1,320 1,330 300 218 177 425 16...... 266 237 1,400 610 400 970 1,320 1,200 415 210 160 460 17...... 254 195 970 560 485 930 2,600 1,230 391 184 225 410 18...... 222 959 750 550 349 1,170 2,100 4,080 331 233 250 363 19...... 214 1,760 600 525 340 2,030 i,aoo 2,230 363 206 377 322 20..i...... 270 1,090 550 550 266 1,920 1,500 1,560 318 230 480 283 21...... 210 792 580 525 254 1,850 1,290 1,610 326 270 367 262 22...... 313 638 600 525 283 1,850 1,120 11,600 262 300 245 270 23...... 287 5»£ 1,850 520 241 1,750 -, 998 6,000 420 840 184 349 24...... 309 415 1,300 1,110 322 1,650 931 3,050 367 600 326 440 25...... 254 450 1,900 2,150 279 1,440 957 2,290 237 450 163 510 26...... 249 480 1,700 892 555 1,290 898 2,050 304 400 400 445 27...... 249 292 1,250 762 535 1,270 853 1,670 309 380 3% 326 28...... 245 249 840 682 540 7,750 840 1,380 460 372 229 350 29...... 274 430 660 638 3,700 774 1,200 367 400 156 283 30...... 229 540 632 588 2,400 744 1,000 872 229 225 367 31...... 160 594 560 1 940 898 214 254 1919-20. 1...... 187 582 1,860 495 266 274 5,200 1,900 480 1,110 367 262. 2...... 180 1,270 1,270 480 304 300 5,470 1,700 363 780 300 270 3...... 210 1,410 1,000 555 300 250 5,070 1,550 354 732 363 254 4...... 245 810 692 372 283 237 4,910 1 400 344 970 231 210 5...... 241 1,820 637 377 296 340 6,300 l'300 550 730 214 287 6...... 254 2,040 665 335 NOTE. Water-stage recorder not operating satisfactorily Oct. 1-14. Dec. 14-29, 1918, Mar. 1. 2,10-16, 21-23, 29-31, Apr. 17-20, July 20, 23-27, Oct. 16-18, Nov. 13-16,1919, Mar. 13,14, Apr. 5, 7-10, 28-30, May 1-7, June 19. 21-26, and July 5-10, 1920. Discharge estimated by hydrograph comparison with records at Knightville and Goss Heights- 160 SUEFACE WATER SUPPLY, 1M&-1920, PAET I. Monthly cKsck&rge of Westfidd River near Weatfidd. Most., for the y«ar» ending Sept. 30, 1919 and J920. [Drainage area, 496 square miles.] Observed discharge (second-feet). Diversion Total discharge from West- (second-feet). field Little Run-off Month. River in inches. (millions Per square Maximum. Minimum. Mean. of gallons). Mean. mile. 1918-19. 425 160 294 401.7 314 0.633 0.75 1,760 170 432 379.6 452 .911 1.02 2.100 218 765 385.4 784 1.58 1.82 2,150 520 783 390.8 803 1.62 1.87 555 241 371 345.0 390 .786 .32 March...... 7,750 840 1,920 355.2 1,940 3.91 4.51 April...... 2,600 744 1,500 363.9 1,520 3.06 3.41 my...... 11,600 762 2,090 367.1 2,110 4.25 4.90 768 237 434 418.6 456 .919 1.03 July...... 840 156 299 406.7 319 .643 .74 480 150 242 392.5 262 .528 .81 1,810 121 463 398.9 484 .976 1.09 *824 The year. .. 11,600 121 804 4,605.4 1.66 22.55 1919-20. 660 180 322 420.02 343 2.36".692 .80 4J30 465 1,150 387.99 1,170 2.63 2,620 495 899 401.01 tie 1.85 2.18 676 254 362 420.53 383 .772 .8» 525 1S4 306 400.34 327 .659 .71 7,300 237 2,710 420.86 2,730 5.50 6.34 April...... 7,200 1,700 3,690 377.11 3,670 7.40 8.26 May...... 1,980 425 1,120 394.26 1,140 2.30 2.65 6,560 344 977 410.32 998 2.01 2.24 July...... 1,110 221 465 421.20 486 .980 1.13 3,080 184 565 440.11 587 1.18 1.36 1,180 150 316 410.39 337 .679 .76 The year. . . 7,300 150 1,070 4,904.14 1,090 2.20 29.90 NOTE. The effect of storage in Borden Brook reservoir not taken into account in computing the total dtocharge. MIDDLE BRANCH OF WESTFIELD RIVER AT GOSS HEIGHTS, MASS. LOCATION. At highway bridge in. GOBS Heights, Hampshire County, 1J miles above village of Huntington and half a mile above confluence of Middle and North branches of Westfield River. DRAINAGE AREA. 53 square miles. RECORDS AVAILABLE. July 14, 1910, to September 30, 1920. GAGES. Water-stage recorder on upstream side of bridge abutment on right bank, referenced to gage datum by means of a hook gage inside of well; an inclined staff is used for auxiliary readings. Prior to September 8, 1912, a chain gage on upstream side of bridge was used. Recorder inspected by Dorice Cady. DISCHARGE MEASUREMENTS. Made from highway bridge or by wading. CHANNEL AND CONTROL. Channel covered with coarse gravel and boulders. Con trol somewhat shifting. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder for the yeai ending September 30, 1919, 6.05 feet at 6 a. m. March 28 (discharge, by extension of rating curve, 3,350 second-feet); minimum stage, 0.83 foot July 1 (discharge 7.5 second-feet). Maximum open-water stage for the year ending September 30, 1920, 6.93 feet during the evening of April 13 (determined from high-water marks), (discharge, CONNECTICUT RIVER BASIN. 161 by extension of rating curve, 4,230 second-feet). A gage height of 7.8 feet was recorded at 6.30 p. m. March 13, but the channel was obstructed by ice. Mini mum discharge, 5 second-feet several days in February and March (stage- discharge relation affected by ice). 1910-1920: Maximum open-water stage recorded, 7.33 feet on July 8, 1915 (discharge, by extension of rating curve, 4,500 second-feet); a gage height of 7.8 feet was recorded on March 13, 1920, but channel was obstructed by ice; minimum stage recorded, 0.70 foot on October 26-27, 1914 (discharge, practically zero). ICE. River usually frozen over during the greater part of the winter; ice jams occa sionally form below the gage causing several feet of backwater. REGULATION. Flow somewhat affected at times by operation of small power plant about 2 miles above station. ACCURACY. Stage-discharge relation changed at time of high water, December 15, 1918, and at breaking up of ice March 17, 1920. Three rating curves used for the two years, 1919 and 1920, all well denned below 1,000 second-feet. Operation of water-stage recorder not entirely satisfactory. Daily discharge ascertained by,applying rating table to mean daily gage height determined by inspection of gage-height graph, except for periods as noted in footnote to daily-dischaige table. Gage heights corrected for effect of ice during winter. Records good October 1 to December 15, 1918, March 1 to July 31, and October 1 to December 15, 1919, and May 26 to September 30, 1920; for other periods during the years 1918-19 and 1919-20, records fair. Discharge measurements of Middle Branch of Westfield River at Gfoss Heights,.Mass., during the years ending Sept. 30, 1919 and 1920. Gage Dis. Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1919. Feet. Sec.-ft. H.W.Fear...... 1.61 132 Dec. 13 M. B. Stackpole...... 1.61 154 J.W. Moulton...... ol.27 19.8 1920. Mar. 20 1.96 247 .....do...... 01.86 24.5 28 2.80 642 28 H.S. Price...... o2.14 39.5 29 .....do...... 2.24 359 Mar. 12 .....do...... 03.12 92 Apr. 23 .....do...... :...... 1.41 105 26 2.66 569 23 .....do...... 1.41 106 Apr. 26 H.S. Price...... 1.82 223 .....do...... 01 11.4 27 .....do.....'...... 1.66 181 2 .....do...... 95 16.2 July 17 Pierce and Lamson .... .91 15.1 2 B. L. Bigwood...... 94 14.7 Sept. 4 .86 13.2 a Stag&discharge relation affected by ice. 102721 23 WSP 501 11 162 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Middle Branch of Westfield River at Ooss Heights, Mass., for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May, Jane. July. Aug. Sept. 1918-19. i...... :.. . 24 24 43 230 32 458 200 66 70 7.6 18 15 2...... 21 20 50 330 76 244 189 187 60 8.0 23 22 3...... 22 16 48 210 60 179 150 127 52 12 18 250 4...... 22 15 34 122 52 160 177 111 56 12 10 180 5...... 19 19 34 115 50 241 214 208 56 12 14 130 6...... 28 22 44 110 43 250 238 146 39 12 20 102 7...... 50 21 51 110 39 155 226 113 60 22 19 60 8...... 33 19 66 98 30 115 202 98 35 20 14 40 9 25 18 60 90 39 281 208 93 41 16 12 100 10...... 22 19 40 78 20 358 200 146 46 18 10 120 11...... 20 20 34 72 21 205 217 430 39 34 10 80 12...... 19 17 72 62 24 162 348 284 35 23 9.0 80 13..,.-;...... 24 16 65 60 43 155 223 303 23 20 8.5 41 14...... 22 16 75 58 60 132 172 194 30 16 9.5 38 15 576 56 82 116 146 139 20 15 9.5 36 tt.l.'...... 17 15 253 43 80 111 174 139 20 13 12 60 17...... 16 17 156 43 46 104 474 253 19 13 11 60 18...... 14 244 127 33 41 174 267 463 19 12 20 37 19 r 16 219 127 30 24 229 194 202 16 26 44 35 20...... 17 101 150 21 32 335 162 153 15 26 32 33 01 24 66 160 21 30 425 141 340 32 23 16 34 22...... 24 50 . 185 20 41 327 118 1,810 16 82 13 36 23...... 21 44 340 26 48 229 100 624 13 217 14 38 24...... 18 44 200 230 52 197 100 288 12 122 15 41 26...... 17 37 380 175 43 172 102 229 12 56 90 44 26...... 14 33 280 145 110 156 93 197 13 32 36 40 27...... 17 43 200 110 115 157 89 162 '4620 41 25 35 28...... 17 125 90 153 1.380 84 129 30 10 28 29...... 15 43 122 at 425 80 111 12 20 17 22 30...... 16 47 162 80 267 73 93 8.5 12 14 19 31...... 21 175 72 226 37 14 13 1919-20. 1...... 17 89 174 41 6 6 682 '215 30 108 44 13 2...... 19 253 132 41 26 6 703 190 27 66 32 11 ' 2423 162 109 41 28 5 650 166 24 68 19 11 109 115 39 oO 8 495 24 94 15 11 5...... 23 420 23 13 14 721 163 88 72 15 10 6...... 21 250 146 no23 ' 30 16 650 145 187 54 13 10 7...... 35 127 *' 16 54 32 339 132 120 32 13 11 8...... 77 13Q 111 OQ 105 254 132 83 30 13 77 ,127 157 23 43 105 212 220 56 30 14 12 10...... 75 120 315 23 23 130 190 165 44 29 15 52 11...... 50 120 174 19 28 100 212 125 34 27 80 fU 12...... 28 153 146 16 OQ 100 209 115 32 26 101 42 13...... 23 235 132 20 23 800 1,200 100 34 37 147 52 14...... 21 9/19 195 24 OQ 1,100 780 on 40 1ft 212 48 15...... 32 136 127 23 10 470 540 100 34 13 ,150 32 16...... 43 109 110 12 6 380 450 190 38 15 134 26 17...... 93 100 no 12 9 315 370 115 242 15 200 OQ 18...... 64 OS 82 12 10 31ft 85 877 15 150 20 19...... 39 86 95 12 14 254 307 76 286 26 Qi 16 20...... 77 82 12 £ 196 293 68 174 29 74 16 21...... 32 86 90 13 6 160 382 100 142 23 54 14 22...... 33 62 100 10 g 152 435 190 147 1o 48 1°. 23...... 33 82 78 12 12 158 460 135 125 16 44 12 24...... 33 60 66 16 1°. 325 115 on 27 19 12 25...... 28 . 37 66 17 10 540 270 90 70 36 29 1°. 26...... 24 19Q 15 6 Q7O 207 7O 52 24 20 12 27...... 33 828 60 10 5 1,140 198 72 46 19 12 28...... 68 278 fLA 30 5 904 535 60 38 10 13 11 29...... 82 179 41 23 5 626 395 48 36 16 15 12 30...... 56 288 24 608 258 42 115 15 47 c 31...... 66 41 7 715 36 15 15 NOTE. Stage-discharge relation affected by ice from Jan. 6 to Feb. 27,1919, and Dec. 20,1919, to Mar. 17, 1920; discharge for these periods based on gage heights corrected for effect of ice by means of discharge measurements, observer's notes, weather records, and comparison with records at other stationsin the West- field River basin. Operation of water-stage recorder unsatisfactory Oct. 12-16, Nov. 4-8, Dec. 21-28,1918, Jan. 1-3. June26-28, July 7-11,29, Aug. 1,3,5,6,10-12,25-27, Sept. 1-30, Dec. 14-31,1919, Jan.1-20, Feb.28-'29. Mar. 1-9, Apr. 13-17, 23-25; May 9-17,20-25, July 7-|, Aug. 10-11,17-18, and Sept. 1-2, 21-22,1920. CONNECTICUT EIVER BASIN. 163 Monthly discharge of Middle Branch of Westfield River at Goss Heights, Mass., for the years ending Sept. 30, 1919 and 1920. < % [Drainage area, 53 square miles.) Discharge in second-feet. Bnn-off Month. Per in inches.- Maximum. Minimum. Mean. square mile. 1918-19. 50 14 21.1 0.398 0;46' 244 15 43. 8 .826 .92- December ...... 576 34 143 2.70 3.11 330 20 97.5 1.84 2.12- February ...... 153 20 53.1 1.00 1.0* March...... 1,380 104 262 4.94 5.70 April...... 474 73 179 3. 38 3.77 May...... 1.810 37 251 4.74 5.46 70 8.5 31.1 .587 .65 July...... 217 7.5 31.6 .596 .69 August ...... 80 8.5 19.2 .362 .42 250 15 61.5 1.16 1.2» The year...... 1,810 7.5 100 1.89 25.63, 1919-20. October...... 93 17 42.3 .798 .92 828 37 173 3.26 3.64 December ...... 315 41 112 2.11 2.43 January. . . 41 7 20.2 .381 .44 February...... 54 5. 17.3 .326 .35 1.140 5 349 6.60 7.61 April...... 1,200 190 442 8.33 9.29 May...... 220 36 120 2.27 2.62 877 24 111 2.09 2.33 July...... 108, 13 33.0 .623 .72 212 13 - 58.7 1.11 1.2& 475 10 36.0 .679 .76 1,200 5 126 2.38 32.3» WESTFIELD LITTLE RIVER NEAR WESTFIELD, MASS. LOCATION. At diversion dam of Springfield waterworks in Russell, Hampden? County, 3 miles below confluence of Pebble and Borden brooks and 3 miles west of Westfield. ' Originally (July, 1905, to December, 1909) a short distance below Borden Brook, near Cobble Mountain. DRAINAGE ABEA. 43 square miles at original site; 48.5 square miles at present site-. RECORDS AVAILABLE. July 13, 1905, to September 30, 1920. DETERMINATION OP DISCHARGE. At the original site below Borden Brook (used! 1905-1909) the discharge was determined by methods commonly employed at current-meter gaging stations. From August, 1906, to September, 1907, a SO^foot weir was maintained a short distance below the gage.9 Since March 1, 1910, high-water flow determined from continuous record of head on concrete diversion dam (crest length, 155.4 feet); for which coefficient* have been deduced from experiments at Cornell University; low-water flow, les» than 163 second-feet, determined from continuous record of head on a 12-foot sharp-crested weir without end contractions, the crest being 2.55 feet below that of the dam. Water diverted to city of Springfield is measured by a 54-inchs Venturi meter, using continuous record chart. Daily record corrected for storage- in a reservoir on Borden Brook about 5 miles above station, but owing to the- time required for water to reach the dam and the natural storage along the stream, the record as corrected does not represent exactly the natural flow of th© stream at all times. »Results obtained by weir and current-meter methods are compared in U. S. Geol. Survey Water Supply Papers 201, pp. 105-110, and 241, pp. 164-168. 164 SURFACE WATER SUPPLY, 1919-1920, PART I. EXTREMES or DISCHARGE. Maximum discharge for 24 hours for the year ending September 30, 1919, 1,470 second-feet, May 22: minimum discharge for 24 hours 5.0 second-feet, July 13. Maximum discharge for 24 hours, for year ending September 30, 1920, 1,940 second-feet, March 13; minimum discharge for 24 hours, 2»7 second-feet, Septem ber 13. 1909-1920: Maximum discharge for 24 hours, 1,940 second-feet, March 13, 1920; minimum discharge apparently zero at various times when the water released from the reservoir was equal to or greater than the total flow at the diver sion dam. DIVERSIONS. Record of water diverted at station for municipal supply of Spring field included in records as published. COOPERATION. Data collected and compiled under the direction of E. E. Loch- ridge, chief engineer, board of water commissioners, Springfield, Mass. Daily discharge, in second-feet, of Westfield Little River near Westfield, Mass., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 26.2 22.9 35.7 102 26.2 489 169 .71.0 30.2 9.1 14.8 12.2 2...... 22.6 17.2 34.2 252 26.0 253 142 142 30.0 9.2 14.4 34.6 3...... 26. 8 13.4 35.2 153 38.5 176 139 106 38.4 10.4 13.1 85.1 4...... 26.6 15.9 25.9 107 27.0 144 172 86.3 35.1 9.7 11.2 74.4 5...... 22.4 27.2 32.5 88-9 26.4 197 230 105 28.6 9 a 12.7 35.2 6...... 22.1 23.8 25.2 71.2 23.1 244 254 85.7 23.9 20.6 15.6 21.9 7...... 20.9 19.8 «>o 7 53.5 32.5 145 270 70.4 21.8 21.2 21.8 14.2 8...... 17.5 17.3 23.3 66.5 21.2 110 2S4 67.2 22.8 15.8 18.4 15.6 g 16.6 16 9 34.4 59.3 16.6 286 327 61.6 24.5 19 o 14.8 45.2 10...... 15.2 16.6 19 1 Sfi 7 25.9 306 328 160 24.4 18.9 13.7 46.1 11...... 13.3 14.2 27.8 39 4 15.4 ISO 346 400 21.1 ^20. 5 12.8 35.8 12...... 21.6 16.5 24 9 43 Q 16.0 127 363 306 22.6 6.0 12.5 ti n 13...... 17.1 11.7 26.6 51.3 17.7 118 278 294 18.2 5.0 12.2 32.5 14...... 21.3 13.8 72.7 45.8 32.7 96.0 237 185 18.1 30.6 11.6 23.8 15...... 13.8 15.0 267 AT 9 CO Q 85.3 173 140 22.4 14.5 11.3 20.5 16...... 14.0 15.4 211 40 6 50.5 77.4 250 110 19.2 9.3 10.8 21.7 17...... 11.0 32.8 36.6 30.0 74.6 526 281 17.9 8.8 11.6 27.2 18...... 12.9 131 £3.3 qo Q 99 ft 140 *>in 381 21.4 9 9 27.6 15.4 19...... 15.1 165 KQ Q VA Q 17.6 193 99Q 207 15.5 14.6 36.3 13.4 20...... 20.2 125 Aft Q Oyl Q n o 273 191 156 15.9 15.0 25.5 9 0 21...... 22.8 5°, Q 44 3" 17.6 288 235 527 15.9 13.2 20.1 15.9 22...... 17.7 53.0 70.0 33.1 45.5 2S4 191 1,470 15.8 46.3 15.7 17.9 23...... 17.6 41.5 309 65.0 AO 0 187 105 512 17.0 78.8 15.8 35.0 24...... 17.4 80.6 244 162 49 d. 141 103 272 20.3 59.7 12.6 38.7 25...... 18.3 40.6 333 109 OO ft 130 107 254 17.2 2&7 14.2 45.5 26...... 17.7 22.7 239 79 7 49 1 114 97.5 201 16 9 18.0 12.1 33.3 27...... 18.0 36.4 121 66.6 59.9 229 93.8 132 23.1 15.9 11.6 26.8 28...... 12.3 34.6 30.4 CO O QO Q 1.330 88.0 9Q 1 38.2 17.2 11.4 VA Q 29 13.5 55.0 57.5 61.2 389 70.2 00 K 13.6 16.6 in Q 24.6 30...... 18.2 56.0 40 8 54.1 999 EQ *> OQ A S 7 12.9 12.1 24.1 31...... 19.7 62.2 49.1 190 29.6 15.5 15.1 CONNECTICUT EIVEE BASIN. 165 Daily discharge, in second-feet, of Westfield Little River near WestfieMr Mass., for the year ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 22.8 44.9 192 41.5 19.1 19.9 250 222 32.6 138 17.1 18.0 2...... 19.9 154 139 51.3 31.3 31.3 224 187 31.2 81.4 14.1 18.6 3...... 19.1 99.4 105 31.6 93 A 31.2 Ojtrt 142 26.4 87.8 12.0 18.3 4...... 99 1 70.4 75.1 no Q nt Q 46 7 332 too O1 R 97.5 1O Q , 15.4 5...... 22.3 292 67.4 21.1 23.7 2S.8 378 118 186 78.5 10.2 14.7 6...... 21.6 172 62.3 19 1 OO fi 110 338 106 223 9.4 13.4 7...... 22.0 91.0 68.3 21.4 25.0 50.7 566 96.4 115 50.7 8.3 16.3 8...... 19.1 66.4 77.3 22.5 36* 90.2 747 132 83.7 43.3 7.5 13.9 9...... 18.9 57.6 206 24.1 41.6 70.8 886 231 59.6 93.8 11.6 12.0 10...... 20.6 49.4 328 23.6 39.4 75.6 1,110 146 51.1 141 23.7 40.0 11...... 25.2 46 4 227 30.8 22.5 106 1,020 123 37.4 78.7 35.4 12...... 16.5 50.4 149 50.9 32.5 288 992 116 32.7 68.8 84.4 36.6 13...... 14.0 137 153 37.5 22.7 1,940 494 126 36.7 63.7 73.3 41.3 14...... 14 9 132 91 ^t 24.4 *J1 A 1,590 151 121 40 6 43 4 85.5 39.0 15...... 20.1 83.2 125 21.8 20.3 207 101 33.3 40.5 74.4 25.9 16...... 23.6 63.1 85.5 32.5 32.0 350 99Q 27.3 34.9 250 17.3 17...... 41.6 56.9 79.6 21.0 23.0 =493 m 84:8 418 25.0 311 14.8 18...... 29.9 52.4 52.2 91 ft 21.3 406 229 68.1 841 22.0 444 12.4 19...... 22.1 63.8 55.3 21.0 21.3 334 218 65.0 354 29.6 187 11.1 20...... 19.5 44.9 36.7 20.5 32.0 340 235 65.7 206 35.1 111 9.6 21...... 43.3 98 7 20.1 21.1 184 215 111 154 24.5 70.6 10.1 22...... 16.9 46.5 27.5 30.8 191 161 124 144 18.5 56.2 9.5 23...... 15.5 47.5 28.0 21.2 30.0 290 185 122 102 19.8 39.7 2.7 24...... 52.5 4.9 9 334 154 104 83.0 29.3 30.3 10.4 25...... 18.2 53.0 33.4 31.8 388 205 94.2 54.6 25.1 24.4 9.5 26...... 17 S 173 32.8 21.1 20.6 424 75.6 50.8 17.4 21.2 7.9 27...... 24.0 528 20.0 31. « 426 365 65.9 38.2 14.2 27.0 7.2 28...... 36.1 QQ 1 Q-l A 419 226 CQ Q 34.5 11.4 22.9 10.1 29...... 42.5 191 34.3 21.6 336 286 48.5 146 5.3 22.2 20.6 30...... 34.2 309 36,8 19.6 276 277 40.7 265 4.8 19.9 629 31...... 34.3 41.1 19.2 275 33.8 19.2 18.4 NOTE. Discharge determined by subtracting from the total flow at the diversion dam the amount of water apparently released from the Borden Brook reservoir or by adding the amount of water apparently stored in the reservoir, as indicated by the elevation of the water surface in the reservoir. As no allowance has been made for evaporation and seepage from the reservoir, the records are not an accurate indication of the natural flow at the diversion dam. Monthly discharge of Westfield Little River near Westfield, Mass., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 48.5 square miles.) Discharge in second-fee^. Mon^h. Per Run-off in Maximum. Minimum. Mean. square inches. mile. 1918-19. October...... 26.8 11.0 18.5 0.381 0.44 November...... 165 11.7 41.1 .847 .94 December ...... 333 19.1 91.3 1.88 2.17 252 33.1 70.1 1.45 1.67 98.8 15.4 32.8 .676 .70 March. 1,330 74.6 233 4.81 5.54 April...... 526 58.3 212 4.37 4.88 May...... 1,470 29.3 223 4.60 5.30 38.4 8.7 22.0 .454 .51 July...... 78.8 5.0 19.1 .394 .45 36.3 10.8 15.3 .315 .36 September...... 85.1 9.8 30.2 .623 .70 1,470 5.0 84.5 1.74 23.66 1919-20. 42.5 14.0 23.0 .474 .55 528 43.3 , 117 2.41 2.69 December ...... '...... 328 27.5 ' 92.7 1.91 2.20 51.3 19.1 26.3 .542 .62 February...... 41.6 19.1 27.4 .565 .61 1,940 19.9 335 6.91 7.97 April...... 1,110 151 382 7.88 8.79 &j...... 231 33.8 108 2.23 2.57 June...... 841 21.6 131 2.70 3.01 July...... 141 4.8 48.8 1.01 1.16 444 7.5 70.5 1.45 1.67 September...... 629 2.7 38.1 .786 .88 1,940 2.7 117 2.41 32.72 SURFACE WATER SUPPLY, 1919-1920, PART I. FARKINaTON RIVER AT HEW BOSTON, MASS. LOCATION. At highway bridge a quarter of a mile below Clam River and 1 mile south of New Boston, Berkshire County. DRAINAGE AREA. 92.7 square miles. RECORDS AVAiLABLE.r-^May 27, 1913, to September 30, 1920. GkoE. Ourley 7-day water-stage recorder on left bank, downstream side of bridge,' referenced to gage datum by a hook gage inside the well; a vertical staff on bridge abutment is used for auxiliary readings. Recorder inspected by George Snow. DISCHARGE MEASUREMENTS. Made from a cable or by wading. CHANNEL AND CONTROL. Channel rocky and covered with boulders; control practi cally permanent. JExTREMES OF DISCHARGE. Maximum stage from water-stage recorder, for the year ending September 30, 1919, 7.11 feet at 7 a. m. March 28 (discharge, by extension of rating curve, 2,640 second-feet); minimum stage from water-stage recorder, 2.58 feet at 7 a. m. June 25 (discharge, 21 second-feet). Maximum stage from water-stage recorder, for the year ending September 30, 1920, 6.99 feet at 2.30 p. m. April 13 (discharge, by extension of rating curve, 2,390 second-feet); minimum stage, from water-stage recorder, 2.67 feet at 8 a. m. October 1, 1919 (discharge, 27 second-feet). 1913-1920: Maximum open-water stage from water-stage recorder, 7.64 feet on October 26, 1913 (discharge, by extension of rating curve, 3,200 second-feet); minimum stage, from water-stage recorder, 2.22 feet on August 27,1913 (discharge, 4.4 second-feet). ICE. River usually frozen over during greater part of winter; stage-discharge relation seriously affected. Ice jams occasionally form below the gage causing several feet of backwater. REGULATION. Flow affected by storage in Otis reservoir about 5 miles above New Boston, which has a capacity of 880 million cubic feet, and by operation of a woodworking shop just above the station. ACCURACY. Stage-discharge relation practically permanent except when affected by ice. Rating curve well defined below 1,700 second-feet. Operation of water- stage recorder was satisfactory throughout both years. Daily discharge ascer-,; tained by applying rating table to mean daily gage height determined by inspec tion of gage-height graph, with correction for ice during winter. Records good for open-water periods, and fair during winter. Discharge measurements of Farmington River at New Boston, Mass., during the'years ending Sept. SO, 1919 and 1920. Dis Gage Dis Pate. Made by height. charge. Dat6. Made by- charge. 1918. Feet. Sec.-ft. 1920. Feet: ""# D«c. 16 4.30 328 « 3/98 '1919 July 29 2.79 32.7 Feb. 20 J.W.Uoalton...... <>3.06 46.9 Apr. 25 3.70 164 Stage-discharge relation aflected by ice. CONNECTICUT RIVER BASIN. Daily discharge, in second-feet, of Farmington River at New Boston, Mass., for the years endmg Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 80 52 73 185 68 A7ft 302 118 127 40 32 112 2...... -'""'82 TO 47 71 455 56 320 254 266 120 36 31 131 3...... 40 71 302 52 254 254 210 |08 32 35 192 4...... 80 62 70 238 44 238 286 173 99 27 78 127 5...... 68 75 64 162 48 $20 415 190 93 38 122 91 6....'...... 66 60 67 162 42 435 478 178 82 84 131 82 7:...... 74 61 82 151 38 flffiQ 478 156 78 88 137 ..; 66. 8J.1...... 68 40 105 151 36 478 139 73 81 129 66 9...... 64 37 75 151 34 302 378 131 75 78 120 6fi 10...... 68 39 65 151 36 455 435 235 60 91 118 73 11...... 46 41 85 14ft 40 OCA 435 535 63 104 116 65 12...... 46 39 68 120 36 224 525 510 75 86 114 77 13...... 47 40 60 105 36 210 415 610 64 76 112 73 14...... 49 42 73 90 36 173 337 645 60 73 114 62 16...... 56 40 550 84 36 151 289 525 44 74 65 63 16...... 50 37 375 74 44 141 302 279 49 73 65 67 17...... 47 KX 254 74 56 141 626 431 49 74 65 66 18...... 43 28» 185 74 48 238 415 770 48 73 94 60 19...... 44 455 141 70 60 302 356 423 44 77 90 54 aa...... 44 302 131 62 60 O*7K 269 326 47 75 80 52 21...... 44 210 112 60 46 435 238 535 45 76 73 77 22...... 44 162 120 56 40 395 210 1,760 37 127 78 127 23...... 43 131 337 64 40 302 185 1,100 36 185 64 169 24...... 42 107 302 220 M\ 9fiQ 162 768 33 122 62 154 25...... 44 87 500 185 44 210 147 496 31 93 63 167 26...... 49 75 356 140 52 185 153 316 75 67 59 137 27...... 46 78 238 98 64 185 147 260 99 61 58 66 28...... 41 76 173 80 88 1,220 137 216 87 50 81 58 29...... 44 90 141 76 600 129 183 £5 40 114 53 30...... 41 88 162 68 478 123 162 49 34 114 49 31...... 49 162 58 Q*7K 135 29 114 1919-20. 1...... 46 160 334 78 100 1,030 379 60 173 35 114 2...... 48 387 266 74 86 84 1,060 316 58 123 43 105 3...... 49 312 160 74 86 cn 938 257 51 147 38 96 4...... 68 241 123 72 88 O4 833 232 58 156 37 9088" 6...... 125 419 143 72 125 165 1,020 197 137 118 34 6...... 122 312 131 74 185 370 980 178 238 99 31 88 7...... 123 QlQ 122 idn 195 620 RA9 151 156 84 54 99 8...... 112 162 123 140 170 480 4.Q1 1QO 114 74 75 98 9...... 84 139 224 155 160 jUSfl 375 286 96 131 73 96 10...... 91 110 464 170 160 ac\ 352 224 70 185 98 125 11...... 94 102 299 170 145 450 341 210 58 114 320 104 12...... 80 110 232 160 135 470 ^*>a 227 47 98 263 164 13...... 84 224 247 155 125 620 1,260 224 65 J17 167 164 14...... 86 230 345 160 120 900 1,140 213 68 74 250 123 15...... 137 163 213 . 140 120 aim 7AR 178 53 71 167 98 16...... 137 125 149 140 110 800 662 154 49 65 395 86 17...... 185 116 133 150 105 win 590 133 269 59 600 76 18...... 171 102 125 160 120 650 530 120 CQO 51 399 67 19...... 169 91 130 125 115 464 486 112 460 63 260 63 20...... 162 77 115 125 110 14R 451 282 68 185 55 21...... :. 151 77 110 105 110 306 570 11S 230 51 141 99 22...... 151 74 10» 110 105 272 R&n 171 202 48 123 137 23...... 147 90 105 115 110 295 600 iu 156 43 106 135 24...... 145 131 100 120 105 431 650 136 123 67 90 135 25...... 135 129 100 90 100 600 468 131 102 64 80 137 26...... 125 269 100 90 90 777 360 107 90 52 74 139 27...... 125 650 84 105 84 1,020 306 OR 84 42 65 137 28...... 151 299 84 105 90 QSft 575 82 81 40 87 139 29...... 145 269 ,76 98 98 889 535 73 90 40 86 147 30...... 139 500 74 98- SU5 4ft3 70 208 ^i 84 730 31...... 149 78 90 980 66 34 105 NOTE. Stage-discharge relation affected by ice Jan. 11 to Feb. 27, 1919, and Dec. 18,1919, to Mar. 18t 1920; discharge for these periods based on gage heights oorrected for effect of ice by means of discharge measurements, observer's notes, and weather records. 168 SURFACE WATER SUPPLY, 191£-1920, PART I. Monthly discharge of Farmington River at New Boston, Mass., for the fyears ending Stpt. 30, 1919 and 1920. [Drainage area, 92.7 square miles. Discharge in second-feet. Run-off in Month. Per inches. Maximum. Minimum. Mean. square mile. 1918-19. Odtober...... 82 41 53.8 0.580 0.67 N ovember ...... 455 37 97.9 1.06 1.18 550 60 170 1.83 2.11 455 56 132 1.42 1.64 February...... 88 34 46.4 .501 ..52 1,220 141 328 3.54 4.08 625 123 315 3.40 3.79 1,750 118 411 4.43 5.11 June...... 127 31 66.8 .721 .80 July...... 185 27 73.0 .787 .91 137 31 88.0 .949 1.09 192 49 89.6 .967 1.08 The rear...... 1,750 27 157 1.69 22.88 1919-20. 185 45 120 1.31 1.51 650 74 209 2.26 2.52 464 74 164 1.77 2.04 January ...... "...... 170 62 118 1.27 1.46 195 84 119 1.28 1.38 March. ... 1,020 SO 534 5.76 6.63 AprU...... 1,260 306 646 6.96 7.76 May...... 379 66 171 1.84 2.32 June...... 882 47 155 1.67 1.02'1.86 July...... :...... 185 34 82.4 .889 600 31 147 1.59 1.83 ' t 758 55 131 1.41 1.57 The year ...... 1,260 31 216 2.33 31.70 HOCKANUH RIVER NEAR EAST HARTFORD, OONN. LOCATION. At bridge on private road just below Case & Marshall paper mill, three- tenths mile west of East Hartford-Manchester town line, Hartford County. South Branch joins Hockanum River \\ miles above station. DRAINAGE AREA. 75.5 square miles (measured on topographic maps'). RECORDS AVAILABLE. September 13, 1919, to' September 30, 1920. GAGE. Friez water-stage recorder on left bank referenced to gage datum by hook gage inside the well;'an outside staff gage is used for auxiliary readings. Recorder inspected by W. T. Dunne. DISCHARGE MEASUREMENTS, Made from bridge or by wading. , CHANNEL AND CONTROL. Stream bed covered with gravel and deposits of manufac turing waste and sediment; control is at well-defined riffle 200 feet below gage. EXTREMES OF DISCHARGE. Maximum stage recorded, 8,1 feet at 5 p. m. March 13 (discharge, by extension of rating curve, 1,450 second-feet). Discharge practically zero at various times when water was held back by dams. ICE. Some ice forms along the river banks but not in sufficient quantities to affect stage-discharge relation. REGULATION. Distribution of flow affected by operation of mills above the gage and by storage in Shenipsit Lake. ACCURACY. Stage-discharge relation is apparently permanent. Rating curve fairly well defined between 10 and 500 second-feet; above 500 second-feet the rating curve is extended as a tangent, the slope being 220 second-feet per foot gage height. Operation of water-stage recorder was satisfactory throughout the year except for the two periods indicated in footnote to daily-discharge table. Daily discharge ascertained by applying rating table to gage heights for short intervals of time during which stage remained practically constant, and dividing the sum of weighted products of time and discharge by 24 hours. Records good. CONNECTICUT RIVER BASIN. : 169 Discharge measurements of Hockanum River, near East Hartford, Conn., during the years ending September SO, 1919 and 1920. Gage Dis «age Dis Date.- Made by height. charge. Date. Made by tatigM. charge. 1919. Feet. Sec.-ft. 1920. Feet. See.-ft. Aug. 24 M.R. Stackpole...... O Q1 12.2 1.61 92 26 2.01 160 3 1.61 88 Oct. 15 .....do...... 2.00 161 Mar. 30' .....do...... 3.74 491 Nov. 4 Oil 160 July 29 1.39 67 » Sept. 27 M.R. Stackpole...... 1.72 101 Daily discharge, in second-feet, of Hockanum River near East Hartford, Conn., for the period 'September 13, 1919, to September SO, 1920. Day. Sept. Oct. Nov. Dec. Jan. Feb. Mat. Apr. May. June. July. AUg. Sept. 1.'...... 09 87 0**Q 100 1 ft 68 OAO 238 Ill 160 62 2.9 2...... 70 26...... 81 21 127 93 ftl 101 460 271 164 73 150 65 16 27...... 103 93 185 71 100 88 \M\ 206 156 91 140 124 84 28...... 6 75 235 91 on 419 97Q 152 228 130 128 72 29...... 80 96 141 7Q in 18 423 352 84 140 127 54 57 30...... HA. 78 149 103 91 410 9ft A. 91 114 125 80 90 31...... 111 103 77 idi 116 78 44 NOTE. Water-stage recorder not in operation March 21-27 and July 24-28; discharge estimated by com parison with records in other basins. Monthly discharge of Hockanum River near East Hartford, Conn., for the year ending September SO, 1920. [Drainage area, 75.5 square miles.] Discharge in second-fee^. Run-ofl in Mon^h. Per Maximum. Minimum. Mean. square I eh . mile. October ...... 155 5 74.8 0.991 .14 235 37 119 1.57 .75 December...... 233 21 122 1.61 .86 January 120 15 73.8 .977 .13 February ...... 122 5 80.0 1.06 .14 1,190 68 406 5.37 6.19 April...... 352 104 235 3.12 3.48 May...... 353 84 210 2.78 3.20 June...... 527 26 174 2.30 2.57 July...... 264 42 124 1.64 1.89 August...... 208 26 84.2 1.12 1.29 200 1.2 85.8 1.14 1.27 The year...... 1.190 1.2 149 1.97 26.91 170 SURFACE WATER SUPPLY, 1919-1920, PART I. HOUSATONIC RIVER BASIN. HOUSATOWrC RIVER NEAR GREAT BARRniGTON, MASS. LOCATION. At highway bridge one-fourth mile northeast of Van Deusenville station of New York, New Haven & Hartford Railroad (Berkshire division) and 2 miles north of Great Barringtoh, Berkshire County, DBAINAGE AREA. 280 square miles. RECORDS AVAILABLE. May 17, 191$ to September 30, 1920. GAGE. Inclined staff attached to concrete anchorages on downstream side of left abutment of highway bridge; vertical high-water'section attached to bridge abutment; read by Mrs. Herbert Armstrong. DISCHARGE MEASUREMENTS. Made from upstream side of highway bridge or by wading. CHANNEL AND CONTROL. Bed composed of sand and gravel; control for high stages is not well defined; at low stages control is at well-defined riffle a few hundred feet below the gage. EXTREMES OP DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 5.02 feet at 7 p. m. May 23 (discharge, by extension of rating curve, 2,490 second-feet); minimum stage recorded, 0.32 foot at 6 p. m. November 10, (discharge, 3.2 second-feet). ! Maximum stage recorded for the year ending September 30, 1920, 7.00 feet March 28 and April- 3 (discharge, by extension of rating curve, 4,300 second-feet); minimum stage recorded, 0.68 foot at 6 p. m. November 10 (discharge, 11 second- ' feet). 1913-1920: Maximum stage recorded, 8.0 feet on March 31, 1916 (discharge, by extension of rating curve, 5,300 second-feet). Zero flow occurred at various times.; caused by storage of water at dams above. ICE. Stage-discharge relation affected by ice for short periods during some winters. REGULATION. Storage above dam of a paper mill about a mile above station causes low flow on Sundays and holidays. ACCURACY. Stage-discharge relation practically permanent, not affected by ice dur ing winters of 1918-19 and 1919-20. Rating curve well defined below 2,000 sec ond-feet. Gage read to quarter-tenths twice daily, except from February 15 to March 31, when it was read once daily. Daily discharge ascertained by applying rating table to mean daily gage height. Records good. Discharge measurements of Housatonic River near Great Barrington, Mass., during the years ending Sept. SO, 1919 and 1920. Dis Dis Date. Made by SB. charge. Date. Made by St. charge. 1918. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Dec. 14 1 Oft ooo Jan. 7 M. R. Stackpole...... 1.58 189 Sept. 30 Stackpole and Lamson. .82 21.4 1919. 30 .....do...... 82 22.4 Apr. 24 .....do...... 2.81 751 HOUSATONIC RIVER BASIN. 171 Daily discharge, in second-feet, of Housatonic River near Great Barrington, Mass., for the years ending Sept. SO, 1919 and 19W. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 405 215 125 570 290 1,490 1,410 570 540 250 215 155 2...... 215 185 335 1,060 68 1,650 1,200 600 630 215 170 250 3...... S3 40 290 1,200 250 1,340 920 630 540 185 20 250 4...... 185 142 335 1,130 458 990 1,130 570 458 150 232 600 S:...... 125 250 312 690 380 920 1,270 660 430 52 155 485 6...... 51 155 33$ 850 270 1,130 1,340 720 430 68 185 380 7...... 155 155 290 250 990 1,810 815 430 155 250 200 8...... 215 215 215 720 358 815 1,570 720 120 200 150 290 9...... 185 215 335 660 232 630 1,490 540 485 358 152 250 10...... 215 14 290 540 358 1,200 1,340 630 250 232 28 250 11...... 232 118 335 512 270 1,340 1,340 920 458 215 200 270 12...... 215 215 335 232 232 990 1,570 1,200 335 155 185 290 13...... 115 150 290 570 250 885 1,570 1,340 290 120 132 430 14...... 155 232 250 512 250 690 1,490 1,270 270 170 215 85 15...... 120 185 690 430 290 512 1,200 1,060 85 200 142 430 16...... 95 128 1,490 540 215 485 1,200 780 290 215 142 215 17...... 101 21 1,200 540 250 690 1,490 815 335 185 31 232 18...... 270 358 920 380 430 885 1,570 1 340 290 155 250 290 19...... 215 815 750 132 290 1,060 1,270 1,340 185 130 1S5 250 20...... 56 1,200 lift 485 290 1,060 920 1,200 215 OQ Mtf, 185 21...... 335 885 512 600 290 1,130 1,060 1 1^ft 185 270 170 70 22...... 270 690 358 458 101 1,200 920 1,730 83 215 170 250 23...... 128 512 815 405 215 990 780 2,470 140 430 185 215 24...... 130 290 920 540 290 885 690 2,290 270 660 87 215 25...... 170 335 1,200 312 920 660 1,490 200 458 120 103 26...... 155 430 1 340 485 250 850 570 1,270 200 485 155 155 27...... 37 358 1^130 660 458 750 380 1,200 185 150 135 185 28...... 185 59 885 600 430 2,290 600 1,060 150 270 ' 132 115 29...... 250 312 570 540 2,050' 600 850 115 232 132 185 30...... 130 290 600 540 1,650 512 660 290 200 152 185 31...... 215 600 540 1,970 690 250 115 1919-20. 1...... 170 405 1 340 155 130 200 4,100 1,810 312 600 110 232 2...... 232 215 l'060'990 630 215 155 4,200 1,410 312 540 357 185 3...... 200 850 335 232 232 4,300 1,270 270 430 312 125 4...... 91 *\ 815 7cn 115 185 335 3,910 1,200 270 122 170 170 5...... 66 660 720 660 215 200 3,730 990 200 232 170 22 6...... 312 990 720 232 200 300 3.640 920 200 430 185 . 34 7...... 200 1,060 512 200 170 58 3,010 885 600 405 290 270 8...... 155 920 630 250 59 458 2,560 850 215 335 77 232 9...... 185 750 690 335 335 458 1,890 885 380 335 380 125 10...... :. 215 720 990 312 232 485 1,490 1,130 290 250 108 457 11...... 290 600 1,130 110 232 458 1,200 1,200 155 24 312 215 12...... 125 780 920 430 132 458 1,490 920 200 170 357 70 13...... 232 1,130 920 250 335 1,060 2,650 920 , 64 290 335 290 14...... 215 1,060 990 290 185 1,490 3,820 885> 232 290 380 335 15...... 200 850 990 270 95 1,650 3,730 815 200 335 89 290 16...... 170 850 750 270 312 1,490 3,010 570 312 270 540 232 17...... 215 850 720 290 232 2,130 2,650 600 250 215 312 270 18...... 430 780 815 155 2,470 2,130 513 1,130 97 457 200 19...... 358 570 485 405 290 2,380 1,570 513 1,130 290 380 44 20...... 458 630 458 215 270 1,970 1,730 513 , 815 335 250 270 21...... 250 600 250 250 155 1,490 1,810 606 660 232 215 215 22...... 290 540 1 570 . 44 1,200 2,130 720 380 200 68 232 23...... 232 215 7sn 215 270 1,130 2,290 380 430 155 185 170 24...... 270 690' 600 290 170 1,410 2,830 600 405 312 232 290 25...... 215 540 250 115 312 2,130 3,190 335 405 170 200 215 26...... 46 512 920 380 270 2,560 2,210 430 380 357 150 16 27...... 1,410 458 250 250 4,200 1,810 485 63 170 170 185 28...... 335 1,730 600 215 232 4,300 1,890 430 215 155 200 200 29 405 1,410 750 250 122 4,100 2,210 335 250 155 31 200 30...... 430 1,340 358 215 4,100 2,210 127 335 170 215 . 200 31...... 512 335 335 4,100 185 185 270 172 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Housatonic River near Great Barrington, Mass., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 280 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 405 37 175 0.625 0.72 1,200 14 306 1.09 1.22 December...... 1,490 125 600 2.14 2.47 1,200 132 600 2.14 2.47 February...... 458 68 287 1.02 1.06 2,290 485 1,110 3.96 4.56 April...... 1,810 380 1,130 4.04 4.51 May...... 2,470 540 1,050 3.75 4.32 June...... 630 83 296 1.06 1.18 July...... 660 28 228- .814 .94 August ...... 250 20 154 .550 .63 September...... 600 70 249 .889 .99 The year...... 2,470 14 517 1.85 25.07 1919-20. 512 46 255 .911 1.05 November...... 1,730 215 816 2.91 3.25 l;340 250 724 2.59 2.99 January...... 660 108 280 1.00 1.15 335 44 208 .743 .80 March...... 4,300 58 1,590 5.68 6.55 Acril...... 4,300 1,200 2,650 9.46 10.55 May...... 1,810 127 756 2.70 3.11 June...... 1.130 63 368 1.32 1.47 July...... '600 24 266 .950 1.10 August ...... 540 31 242 .864 1.00 September...... 457 16 200 .714 .80 The year...... 4.300 16 695 2.48 33.82 , HOUSATONIC RIVER AT FALLS VILLAGE, CONN. LOCATION. Half a mile below power plant of Connecticut Power Co. at Falls Village, Litchfield County. DRAINAGE AREA. 644 square miles. RECORDS AVAILABLE. July 11,1912, to September 30,1920. GAGES. Stevens continuous water-stage recorder on left bank; referenced to gage datum by hook gage inside the well; a vertical staff on river bank 25 feet upstream and chain gage 300 feet upstream are used for auxiliary readings. Recorder inspected by J. K. MacHe. DISCHARGE MEASUREMENTS. Made from cable 150 feet above gage or by wading. CHANNEL AND CONTROL. Channel deep and fairly uniform in cross-section; one channel at all stages. Control not clearly defined except at low stages; probably permanent. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder, for the year ending September 30, 1919, 8.34 feet at 2.30 a. m. March 28 (discharge, 4,320 second-feet); minimum stage from water-stage recorder, 0.70 foot at various times when water was held back by dam (discharge, 39 second-feet). Maximum stage, from water-stage recorder, for the year ending September 30, 1920, 12.44 feet at 1 a. m. March 29 (discharge, 7,950 second-feet); minimum stage, from water-stage recorder, 0.49 foot at 6 p. m. October 18, when water was held back by dam (discharge, 14 second-feet). 1912-1920: Maximum stage recorded, 13.3 feet on March 29, 1914 (discharge, 8,830 second-feet); minimum stage recorded, zero flow at various times owing to storage of water above power plant. HOUSATONIC RIVER BASIN. 173 ICE. Stage-discharge relation affected by ice during some winters. REGULATION. Low-water flow is completely regulated by the power plant at Falls Village. ACCURACY. Stage-discharge relation practically permanent; affected by ice Decem ber 18, 1919, to March 27, 1920. Rating curve well defined between 200 and 7,000 second-feet. Operation of the water-stage recorder satisfactory except for short periods as shown in footnote to daily-discharge table. Daily discharge ascertained by use of discharge integrator. Records good. Discharge measurements of Housatonic River at Falls Village, Conn., during the years ending Sept. SO, 1919 and 1920 Gage Dis Date. Made by height. charge. 1919. i Feet. Sec.-ft. Apr. 24 4.86 1,900 1920. o3.61 760 .....do...... :...... 2.58 o Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Housatonic River at Falls Village, Conn., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 860 335 370 1,100 1,100 2,500 3,200 1,120 1,250 420 '240360 58 2...... 670 415 770 1,700 440 3,600 2,700 1,1<50 1,150 430 245 3...... 680 186 540 2,350 888 3,199 2,420 1,400 1,000 450 90 640 4...... 640 320 560 2,230 650 2,400 2,350 1,280 910 50 360 840 5...... 630 305 570 1,660 610 1,920 2,650 1,400 840 85 350 1,OCO 6...... 310 400 550 1,540 650 1,960 2,900 1,220 850 150 355 850 7...... 485 335 415 1 430 610 1,980 3,000 1,250 820 520 350 235 8...... 700 340 350 l'400 590 1,700 3,080 1,220 395 345 375 235 9...... 650 430 570 1,300 320 1,540 3,050 1,170 640 330 194 265 10...... 600 240 560 1,200 540 2,150 2,900 1,120 730 355 54 420 11...... 530 310 510 1,140 560 2,320 2,800 1,360 590 365 315 365 12...... 520 340 435 1,440 440 2,150 2,900 1,840 630 390 295 400 13...... 320 355 570 1 560 440 1,900 3,000 2,050 570 104 200 495 14...... 360 265 650 1,360 440 1,620 2,900 2,100 570 465 225 250 15...... 370 325 1,280 1,200 285 1,180 2,700 1,860 335 385 230 450 16...... 400 340 2,000 1,080 580 1,120 2,500 1,540 510 360 156 330 17...... 450 150 1,980 1,080 610 1,390 2,720 1,360 510 295 65 350 18...... 500 710 1,680 1,040 510 1,440 2,940 2,120 510 255 240 350 19...... 390 1,500 1,260 560 520 2,250 2,720 2,400 485 305 230 350 20...... 140 2,050 1,100 870 seo 2,250 2,350 2,200 455 63 300 460 21...... 405 1,800 1,020 870 520 2,150 1,940 1,920 245 290 295 180 22...... 440 1,440 690 820 530 2,150 1,780 2,450 96 420 310 250 23...... 450 1,200 1,280 820 174 2,100 1,650 3,250 465 1,020 150 500 24...... 340 760 1,560 1,260 450 1,880 1,540 3,300 335 1,320 102 450 25...... 230 950 2,050 1,360 410 1,720 1,440 3,150 415 850 270 425 26...... 260 810 2,300 1,390 820 1,560 1,200 2,700 360 850 240 320 27...... 225 790 2,100 1,350 850 1,520 1,070 2,250 420 530 250 360 28...... 270 435 1,720 1,250 880 3,200 1,440 1,860 560 650 240 124 29...... 360 660 1,280 1,200 3,600 1,220 1,600 400 580 225 430 30...... 490 700 1,440 1,200 3,200 1,020 1,500 400 520 144 340 31...... 375 1.220 1.200 3.300 1,350 440 fiO 174 SURFACE WATER SUPPLY PART I. Daily discharge, in second-feet, of Housatonic River at Falls Village, Conn., for the years ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 310 600 2,500 400 195 135 7,100 3,200 590 850 260 490 2...... 285 820 2,000 500 340 150 7,100 2,850 520 940 305 410 3...... 275. 1,320 1,860 600 320 200 7,200 2,500 970 930 300 420 4...... 280 1,340 1,360 340 310 195 6,800 2,200 500 620 340 390 5...... 61 1,240 1,120 520 340 310 6,200 2,050 830 580 335 205 6...... 300 1,560 1,020 500 340 310 6,400 1,860 680 850 315 132 7...... 290 1,680 790 420 330 760 5,700 1,700 1,180 670 340 395 8...... 270 1,380 1,140 320 175 960 4,950 1,640 950 630 230 365 9...... 310 1,040 1,180 420 320 1,000 4,000 1,780 820 435 260 385 10...... 290 1,040 1,740 460 310 1,000 3,150 1,860 640 540 250 390 11...... 440 790 1,980 430 260 1,150 2,800 1,840 500 430 910 670 12...... 154 810 1,800 540 280 1,050 2,600 1,880 360 580 1,420 810 13...... 385 1,220 1,680 380 260 2,200 3,150 1,840 280 405 830 920 14...... 395 1,440 1,740 390 230 3,400 5,100 1,760 580 405 870 1,000 15...... 470 1,560 1,900 390 . 3,900 5,300 1,580 530 470 1,180 800 15...... 410 1,380 1,380 360 320 3,900 5,000 1,380 400 415 1,660 680 IT...... 475 1,360 1.320 400 270 3,900 4,500 1,380 770 475 2,800 600 18...... 440 1,060 1,300 210 270 3,000 3,700 1,180 2,100 340 2,050 500 19...... 445 910 1,300 390 250 3,000 3,250 870 2,550 400 1,440 160 20...... 620 920 1,350 240 280 3,500 2,950 950 1,960 410 1,080 480 21...... 415 850 1,350 260 230 4,000 2,800 1,020 1,480 485 720 460 22...... ;.. 415 820 1,100 350 MO 3,600 2,900 1,030 1 260 385 500 440 23...... 430 490 960 350 270 2,800 3,100 1,160 1,020 390 750 400 24...... 400 820 840 350 280 2,800 3,500 1,260 920 410 570 380 25...... 425 780 800 240 250 2,900 3,700 1,040 760 420 510 365 26...... 126 920 880 310 300 4,200 3,300 990 580 430 540 91 27...... 415 1,620 840 390 260 6,000 2,950 880 420 415 370 395 28...... 270 2,600 780 240 220 7,600 2,800 820 510 380 470 360 29...... 415 2,400 780 320 210 7,800 3,550 630 445 365 410 330 30...... 480 2,400 680 330 7,300 3,400 485 640 355 320 1,200 31...... 580 660 350 7,100 530 380 370 NOTE. Stage-discharge relation affected by ice Dec. 18,1919, to Mar. 27,1920; discharge for this period based on gage heights corrected for effect of ice by means of one discharge measurement, power plant records, and climatic data. Water-stage recorder not operating satisfactorily Oct. 15-17 ,1918, Jan. 27 to Feb. 1, Mar. 30-31, May 30 to June 3, June 29 to July 3, July 25 to Aug. \, 1919, and Sept. 13-23,1920; discharge estimated by comparison with records of Housatonic River near Great Barrington, Monthly discharge of Housatonic River at Falls Village, Conn., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 644 square miles.] Discharge in second-feet- Month. Per Run-off Maximum. Minltnnm. Mean. square in inches mile. 1918-19. 860 140 453 0.703 0.81 2,050 150 640 .994 1.11 2,300 350 1,080 1.68 1.94 January...... 2,350 560 1,290 2.00 2.31 1,10Q 174 568 .882 .92 March...... 3,600 1,120 2,160 3.35 3.86 April...... 3,200 1,020 2,340 3.63 4.05 May...... 3,300 1,120 1,820 2.82.904' 3.25 1,250 96 582 1.01 July...... 1,320 50 438 .680 .78 375 54 235 .365 .42 September ...... 1,060 58 401 .623 .70 The year ...... 3,600 50 1,000 1.55 21.16 1919-20. 620 61 364 .565 feP65 November...... 2,680 490 1,240 1.32 2.14 2,500 660 1,290 2.00 2.31 January ...... 600 210 377 .585 .67 340 140 267 .415 .45. 7,800 135 2,910 4.52 5.21 April...... 7,200 2,600 4,300 6.68 7.45 May...... 3,200 485 1,490 2.31 2.66 2,550 280 858 1.33 1.48 July...... 940 340 509 .790 .91 2,800 230 732 1.14 1.31 September...... 1,200 91 487 .756 .84 7,800 61 1,240 1.92 26.08 HOTJSATONIC BIVEB BASIN. 175 NAITGATTTCK RIVER NEAR NATTGATTTCK, CONN. LOCATION. One-fifth mile above Beacon Hill Brook and 1.3 miles below Naugatuck, ,New Haven County. DRAINAGE AREA. 247'square miles (measured on topographic maps). RECORDS AVAILABLE. June 15, 1918, to September 30, 1920. GAGE. Gurley water-stage recorder on left bank installed August 12,1919, refer enced to gage datum by hook gage inside the well; an outside staff gage is used for auxiliary readings. From June 15, 1918, to August 12, 1919, a Sanborn recorder was used. DISCHARGE MEASUREMENTS. Made from cable or by wading. CHANNEL AND CONTROL. Channel deep and fairly uniform in section at the gage; control is well-defined riffle a few hundred feet downstream. EXTREMES OF DISCHARGE. 1918-1920: Maximum stage recorded, 8.0 feet at 4.50 p. m. March 13, 1920 (discharge, by extension of rating curve, 5,700 second-feet); minimum stage recorded, 0.83 foot at 9 p. m. August 12, 1919 (discharge, by extension of rating curve, 50 second-feet). ICE. Some shore ice forms in the vicinity of the gage, but the stage-discharge is apparently not affected. REGULATION. Distribution of flow somewhat affected by operation of mills at Nauga tuck and towns above, also by several small reservoirs. ACCURACY, Stage-discharge relation is apparently permanent. Rating curve well defined between 90 and 2,500 second-feet. Daily discharge ascertained by applying rating table to mean daily gage height, as taken from recorder sheets. Records good. Discharge measurements of Naugatuck River near Naugatuck, Conn., during the years ending Sept. SO, 1918-1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet Sec.-ft. 1919. Feet. Sec.-ft. July 16 1.43 160 Nov. 3 2.40 . 568 Nov. 18 2.88 880 Dec. 3 2.37 530 1919. 1920. Aug. 10 J.W.Moulton...... 1.12 Q7 1.58 201 12 .....do...... 1.28 146 Mar. 29 .....do...... 4.47 2>170 Oct. 17 M. R. Stackpole...... 2.24 506 29 .....do...... ,4.40 .2,120 18 .....do...... 1.96 341 Sept. 28 .....do...... 1.45 178 Daily discharge, in second-feet, of Naugatuck River near Naugatuck, Conn., for the years ending Sept. 30, 1918-1920. Day. June. July. Aug. Sept. Day. June. July. Aug. Sept. 1918. 1...... 156 134 134 16...... 181 134 114 114 2...... 156 134 114 17...... 156 209 94 114 3...... 156 114 114 18...... 181 278 76'76 114 4...... 156 94 114 19...... 156 181 181 5...... 156 181 114 20...... 156 134 76 181 6...... 156 209 114 21...... 134 13476' 76 1278 7...... 134 150 i 114 22...... 515 76 .209 8...... 134 120 114 23...... 465 94 94 1 156 9...... 134 114 134 24...... 240 94 76 ' ' f!34,114 10...... 134 114 134 25...... 209 114 76 111...... 134 114 114 26...... 181 114 76 365 12...... 134 134 94 27...... 181 94 60 750 13...:...... 134 114 134 28...... 156 76 76 320 14...... 114 134 114 29...... 156 94 134 209 15...... 209 ' 181 134 94 30...... 156 94 114 181 31...... 94 94 176 SURFACE WATER SUPPLY, 1919>-19SO, PART I. Daily discharge, in second-feet, of Naugatuck River near Naugatuck, Conn., for the years ending Sept. SO, 1918-1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. AufT. Sept. 1918-19. 1...... 156 134 181 543 181 1,520 630 240 350 134 120 130 2...... 134 114 181 1.470 134 1,000 515 750 325 114 110 270 3...... 134 94 209 1,110 240 700 465 515 300 209 105 1,210 4...... 240 114 181 995 224 500 600 365 278 94 100 823 5...... 134 181 181 543 224 365 690 365 240 94 110 405 6...... 156 156 181 543 209 365 750 320 209 181 105 258 7...... 209 156 156 465 209 278 690 209 209 278 100 190 8...... 181 156 181 440 168 195 690 320 181 156 95 181 9...... 134 134 181 415 181 925 630 278 181 114 95 192 10...... 134 134 209 342 168 1,600 570 465 209 134 90 178 11...... 134 134 156 320 181 750 690 1,110 240 134 90 234 12...... 114 134 181 224 168 543 1,150 750 278 114 92 490 13...... 114 134 240 278 181 440 890 820 209 114 88 298 14...... 134 134 278 298 240 258 690 630 181 114 96 234 15...... 134 134 1,350 298 415 195 570 515 156 114 94 210 16...... 114 134 890 298 543 298 750 365 156 134 88 195 17...... 114 181 515 278 342 465 2,390 570 156 134 86 181 18...... 114 820 365 298 298 785 1,270 1,430 156 134 278 166 19...... 114 890 278 298 209 855 890 820 181 209 270 161 20...... 94 515 240 278 209 465 690 570 156 156 171 152 21...... 156 320 240 258 209 690 630 1,190 156 156 148 143 22...... 156 240 278 320 209 465 515 1,750 134 200 130 154 23...... 134 209 1.270 1,190 278 440 465 2,200 114 500 110 338 24...... 114 181 690 690 365 543 415 2,030 114 340 92 435 25...... 134 209 1,110 465 342 550 415 1,770 114 200 118 258 26...... 114 181 750 415 1,350 500 365 1,520 114 150 136 206 27...... 134 114 570 365 750 450 320 1,000 240 130 112 181 28...... 134 156 415 415 543 2,000 320 700 365 120 104 150 29...... 156 240 320 298 1,500 320 500 209 110 96 154 30...... 181 278 278 298 1,100 278 450 156 105 116 154 q-i 134 320 240 SOO 400 100 141 1919-20. 1...... 145 338 932 266 192 195 1,960 925 360 785 227 184 2...... 145 548 654 262 201 198 2,070 820 329 465 215 166 3...... 156 612 521 224 198 195 1,980 660 316 738 187 156 4...... 150 415 395 215 198 227 1,520 660 320 1,310 173 152 5...... 136 642 360 195 195 750 1,490 624 974 630 16S 156 6...... 195 702 338 190 210 2,310 1,690 537 1,470 455 156 166 7...... 190 480 475 204 215 1,430 1 220 490 806 351 163 176 8...... 161 410 515 209 210 1,080 1,030 600 531 298 168 166 9...... 150 375 630 278 210 869 855 1,430 415 266 163 156 10...... 171 365 1,270 278 200 806 750 890 342 240 152 278 11...... 176 298 1,030 247 200 862 714 714 311 204 171 395 12...... 176 320 750 247 187 1,120 684 876 278 270 311 320 13...... 187 582 785 237 195 3,840 2,070 980 324 672 240 425 14...... 187 764 1,080 227 190 2,940 2,250 960 420 380 227 262 15...... 258 505 897 204 244 1,790 1,290 750 311 338 298 204 16...... 251 390 570 204 245 1,690 1,090 600 234 347 254 187 17...... 445 351 521 206 240 3>320 1,310 553 360 247 642 184 18...... 342 333 320 209 240 2,610 1,020 500 1,800 570 946 168 19...... 234 316 282 198 254 1,730 841 465 995 440 827 152 20...... 221 274 294 204 237 1,330 720 465 570 274 455 154 21...... 204 240 298 212 230 1,090 1,020 600 618 266 298 156 22...... 215 244 320 204 224 1,110 1,210 1,270 764 342 251 156 23 212 251 320 204 224 1,490 1,130 1,290 654 925 237 152 24...... 195 270 329 209 227 2,210 1,150 834 500 630 206 154 25...... 184 258 307 201 224 2,750 841 696 390 515 192 152 26...... 176 465 298 204 215 2,880 690 600 339 440 176 132 27...... 176 1,370 320 224 198 3,070 636 543 282 311 168 141 28...... 215 995 311 274 195 2,700 1,170 495 282 254 156 166 29...... 258 672 294 251 212 2,410 1,290 450 278 215 138 161 30...... 270 995 262 234 2,300 855 400 415 198 145 2,250 31...... 300 262 209 2,100 370 209 181 NOTE. Water-stage recorder not operating satisfactorily, Mar. 2-5, 25-31, May 22,23, 27-31, June 1-3, July 22-31, Aug. 1-11, Sept. 15,16, Oct. 30,31,1919, Feb. 5,6, 8^11,16-18, and Sept. 5,6,1920. Discharge estimated by hydrograph comparisons with records in other basins. BIVEB BASIN* 177 Monthly discharge of Naugatuck River near Naugatuck, Conn., for the years ending Sept. 30, [Drainage area, 247 square miles.] Discharge in second-feet. 'Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918. June 16-30...... 4 515 214 0.866. 0.52 July...... ; 278 138 .547 August...... 209 109 .441 .51 , September...... 750 172 .78 1918-19. October...... 240 94 140 .567 .65 November...... 890 94 224 .907 1.01 December...... 1,350 156 406 1.64 1.89 January...... j 1,470 224 474 1.92 2.21 February...... 1.350 134 313 1.27 1.32 March...... 2,000 195 695 2.81 3.24 April...... 2.390 278 675 2.73 3.05 May...... 2,200 209 804 3.26 3.76 June...... j 865 114 202 .81* .91 July...... 500 161 .652 .75 August...... 278 119 .482 .56 September...... *...... 1,210 130 278 1.13 1.26 Theyear...... :... 2,390 375 1.52 20.61 1919-20. October...... 445 136 209 .98 November...... 1,370 240 493 2.00 2.23 December...... 1,270 262 514 2.08 2.40 January...... 5.'...... 278 190 224 .907 1.05 February...... 2,54 190 214 .866 .93 March...... 3,840 195 1,720 6.96 8.02 April...... 2.250 636 1,220 4.94 5.51 May...... 1,430 370 711 2.88 3.32 June...... 1,800 234 533 2.16 2.41 July...... 1,310 198 438 1.77 2.04 August...... 946 138 267 1.08 1.24 September...... 2,250 132 261 1.06 1.18 Theyear...... 3,840 132 568 2.30 31.31 MIANUS RIVER BASIN. MIANTJS RIVER AT NORTH MIANT7S, CONN. LOCATION. At Palmer dam, North Mianus, 1 mile north of Mianus, Greenwich Township, and 2 miles west of Stamford, Fairfield County. DRAINAGE AREA. 29.9 square miles (measured on topographic map). RECORDS AVAILABLE. February 4 to September 30, 1920. GAGE. Friez water-stage recorder on right bank about halfway between dam and highway bridge; referenced to gage datum by hook gage inside the well. Re corder inspected by E. N. Sampson. DISCHARGE MEASUREMENTS. Made at cable section about one-fourth mile above the gage, and also from highway bridge. CHANNEL AND CONTROL. The old mill pond extends back to the highway bridge; water opposite gage is smooth, with low velocity at ordinary stages. Control is formed by crest of 6-foot sharp-crested weir without end contractions, built in old canal at right end of dam; water begins to go over crest of dam at gage height 1.85 feet; dam has a spillway length of 79.2 feet, with smooth rounded crest. 102721 23 WSP 501 12 178 SURFACE WATER SUPPLY^ 191&-1920, PART I. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder during the period February 4 to September 30, 3.67 feet at 5 p. m. September 30 (discharge, by extension of rating curve, 810 second-feet); minimum stage from water-stage recorder, 0.38 foot at 11.50 a. m. July 23 (discharge, 3.4 second-feet). ICE. Weir remains clear of ice, stage-discharge relation not affected. REGULATION. The operation of a mill about one mile above the gage causes large fluctuations in discharge during ordinary stages. ACCURACY. Stage-discharge relation has remained unchanged since gage was established. Rating curve well defined below 260 second-feet. Operation of water-stage recorder satisfactory. Daily discharge ascertained by averaging discharge for 12 two-hour periods. Records excellent. Discharge measurements of Mianus River at North Mianus,* Conn., during the year' ending Sept. SO, 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. Feet. Sec.-ft, Feet. Sec.-ft. Mar. 28 t u OEO July 11 0.82 15.5 28 2.52 944 11 .....do...... J82 15.7 Apr. 11 .....do...... 1.98 71 25 .....do...... 1.77 49.4 11 .....do...... 1.98 70 Sept. 25 M. R. Stackpole...... 42 4.1 May 30 1.41 35.1 25 .41 4.0 30 .....do...... 1.40 34.8 25 .....do...... 40 4.0 Daily discharge, in second-feet, of Mianus River at North Mianus, Conn., for the year ending Sept. SO, 1920. Day. Feb. Mar. Apr. May. June. July, Aug. Sept. 1...... 22 157 96 30 49 18 28 2..:...... 18 183 94 28 27 19 23 3...... 16 185 78 27 55 14 18 i...... 17 150 73 26 78 11 11 5...... 15 73 138 69 109 51 9.8 14 6...... 20 198 125 60 159 33 10 14 7...... 15 138 106 56 96 27 17 19 8...... 20 124 93 67 55 19 38 13 9...... 21 100 83 101 43 19 29 15 10...... 18 82 76 76 36 14 18 57 11...... 16 101 69 64 32 16 28 70 12...... 18 127 67 72 29 20 23 109 13...... 17 469 209 93 An 16 59 82 14...... 14 365 257 114 47 16 55 43 15...... oo 971 162 130 33 10 58 32 16...... 41 202 128 95 26 54 142 21 17...... :...... 46 530 192 73 27 24 310 24 18...... ^i 471 163 65 72 8.0 166 . 11 19...... '...... 30 297 122 61 56 21 110 4.0 20...... 27 195 100 57 38 24 78 28 21...... 25 154 144 86 39 20 59 9.0 22...... 24 212 155 123 40 12 55 7.7 23...... 26 263 134 89 31 13 47 13 24...... 23 298 120 68 29 64 39 14 25...... 23 315 98 63 23 48 34 9.0 26...... !...... 24 307 84 54 20 31 32 3.8 27...... 20 289 78 48 19 20 31 20 28...... 15 238 113 45 22 16 22 11 29...... 20 246 113 39 15 13 23 58 30...... 258 91 35 64 11 20 ' 416 31...... 1QS 32 11 : 22 HUDSOK RIVER BASIN. 17& Monthly discharge of Micmus River at North Miunus, Conn.,for the year ending Sept. SO, 1920. [Drainage area, 29.9 square miles.] * Discharge in second-feet Run-oft Month. Per La inches. Maximum. Minimum. Mean. square mile. 46 14 23.1 0.773 0.75 530 16 213 7.12 8.21 AmU...... 257 67 130 4.35 4.85 l&y...... 130 32 73.4 2.45 2.82 159 15 43.7 1.46 1.63 July...... 78 8.0 27.4 .916 1.06 310 9.8 51.5 1.72 1.98 416 3.8 39. 9 1.33 1.48 HUDSON RIVER BASIN. HUDSON RIVER AT GOOLEY, HEAR INDIAN LAKE, N. Y."> LOCATION. About 1 mile above Gooley, Essex County, 1 mile below mouth of Cedar River, 1J miles above mouth of Indian River, and 6 miles northeast of Indian Lake village, Hamilton County. DRAINAGE AREA. 418 square miles (measured on topographic maps). RECORDS AVAILABLE. August 30, 19X6, to September 30, 1920. GAGE. Gurley printing water-stage recorder on right bank. Inspected by 'John A. Bol'ton. DISCHARGE MEASUREMENTS. Made from cable 100 yards below gage or by wading. CHANNEL AND CONTROL. Solid ledge overlain with coarse gravel; probably perma nent. EXTREMES OP DISCHARGE. Maximum stage from water-stage recorder, for year end ing Sept. 30. 1919, 8.7 feet from 2 to 4 p. m. April 12 (discharge, 10,400 second- feet); minimum stage, from water-stage recorder, 1.5 feet at noon August 17, (discharge, 73 second-feet). Maximum stage from water-stage recorder for year ending September 30, 1920, 7.88 feet at 8 a. m. April 22 (discharge, 8,500 second-feet); minimum stage from water-stage recorder, 1.57 feet during most of June 15 and 16 (discharge, 93 second-feet). 1916-1920: Maximum qtage from water-s.tage recorder, 9.87 feet at 11 a. m. June 12, 1917 (discharge, 13,500 second-feet); minimum stage from water-stage recorder, 1.43 feet from 11 a. m. September 11 to 8 a. m. September 13, 1916, (discharge, 56 second-feet). ICE. Stage-discharge relation affected by ice. REGULATION. Large diurnal fluctuation due to logging operations during spring. Seasonal distribution of flow slightly affected by storage. ACCURACY. Stage-discharge relation practically permanent except as affected by ice from December to March, and by backwater from logs from April 27 to June 3, 1920. Rating curve fairly well defined between 70 and 600 second-feet and well defined between 600 and 6,000 second-feet. Operation of water-stage recorder satisfactory except for periods indicated in footnote to daily-discharge table. Daily discharge ascertained by applying to rating table mean daily gage height obtained by averaging the hourly gage heights, or for days of considerable variation in stage by averaging the hourly discharge. Records good except for periods of ice effect and when stage-discharge relation was affected by backwater from logs, which are fair. 10 Formerly published as Hudson River near Indian Lake, N. Y. 180 SURFACE WATEE SUPPLY, 191£-1920, PART I. Discharge measurements of Hudson River at Gooley, near Indian Lake, N. Y., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1919. Feet. Sec.-ft. Oct. 25 1 3.12 956 Oct. 23 2.84 749 1919. 1920. Jan. 14 ....do...... o2.94 389 o2.91 255 Feb. 12 .....do...... o2.47 240 23 02.48 185 Mar. 12 CflK Feb. 20 o2.95 181 3.29 1,160 Mar. 10 .....do...... o3.37 240 May 8 .....do...... 4.70 2,920 May 12 .....do...... 65.08 2,960 8 .....do...... <\ i Stage-discharge relation affected by ice. 6 Stage-discharge relation affected by logs. Daily discharge, in second-feet, of Hudson River at Gooley, near Indian Lake, N. Y., for the years ending Sept* 30, 1919 and!920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1,100 2,480 850 800 300 240 1,500 1,150 280 234 224 2...... 932 2,600 750 700 280 260 1,200 065 180 207 224 3...... 810 2,220 700 700 280 280 1,000 488 207 175 247 4...... 735 1,750 600 650 280 300 800 416 143 164 229 5...... 735 1,440 550 600 240 280 1,000 \2,000 399 104 153 247 6...... 772 1,240 562 550 240 360 1,290 372 187 160 220 7...... 1,120 1,060 735 550 240 460 1,750 491 267 211 183 8...... 3,490 932 772 500 240 440 2,470 700 282 167 167 9...... 3,660 810 735 480 240 420 2,510 1,630 630 179 142 700 10...... 2,600 772 630 440 240 480 3,360 1,770 476 202 132 1,150 11...... 1,860 772 665 400 200 550 5', 250 394 428 109 1,200 12...... 1,540 772 850 380 220 550 9,490 1,100 367 361 108 1,020 13...... 1,340 700 890 380 200 500 6,400 336 290 90 890 14...... 1,340 665 700 380 200 500 5,270 315 242 82 700 15...... 1,060 630 595 360 220 420 2,830 4,010 367 252 82 595 16...... 777 562 975 400 240 400 2,960 4,210 508 346 82 488 17...... 595 530 1,060 500 220 400 4,000 1,930 772 399 SO 405 18...... 530 595 1,100 380 260 460 2,750 2,100 735 394 100 336 19...... 506 1,200 1,290 280 240 900 2,000 2,700 506 320 200 285 20...... 494 1,800 1,290 320 220 1,100 1,890 1,930 388 259 200 261 21...... 476 1,920 850 260 220 1,100 2,820 1,560 325 235 190 252 22...... 562 1,700 665 220 220 1,000 1,560 1,620 524 261 170 280 23...... 824 1,390 890 180 220 950 1,160 2,760 665 266 157 388 24...... 1,240 1,100 1,290 280 240 800 1,650 3,780 512 252 157 530 25...... 1,200 890 1,340 600 260 650 1.740 305 247 224 530 26...... 975 735 1,390 600 280 600 3,390 234 224 229 494 27...... 890 630 1,240 480 280 700 1,470 382 238 207 434 28...... ;. 975 562 1,150 400 260 1,600 1,360 j *UU 470 295 183 378 750 1,020 340 1,100 2,520 351 305 179 330 30...... 975 900 950 320 2,400 2,100 310 285 179 295 31 ...... l.Ofifl 850 300 1.900 261 211 HUDSON RIVEH BASIN'. Daily discharge, in second-jeet, oj Hudson River at Gooley, near Indian Lake, 'JW- Y.,for the years ending Sept. SO, 1919 and 1980 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 256 700 190 140 2,470 1,930 280 325 290 280 2...... 266 772 220 190 140 2,730 1,920 295 271 295 256 3...... 285 700 140 180 140 3,140 1,590 1,230 247 295 224 4...... 285 650 100 180 140 2,930 1,340 967 271 271 216 5...... OCR 600 100 170 140 2 firm 1,060 290 336 234 203 6...... 369 550 100 160 170 2,860 1,800 238 410 203 195 7...... 694 500 110 160 240 2,600 1,240 496 452 171 191 8...... QOO 480 120 160 280 2,040 1,570 1,510 494 157 183 9...... 850 460 120 160 260 1,590 890 513 518 146 '164171 10...... 735 440 130 160 240 1,200 1,020 135 576 157 11...... 735 460 140 170 240 1,150 2,270 125 588 204 153 12...... 700 480 140 170 260 1,020 1,560 1,200 536 315 153 13...... 630 550 150 170 360 1,580 346 376 470 300 171 14...... 562 600 160 180 480 2,730 700 115 440 320 199 15...... 464 650 ten 550 9 9?n 1,280 96 470 562 203 16...... 600 180 : 180 650 2,020 271 96 422 530 207 17...... A tin KEfl 180 iftn 700 2,400 1,010 115 434 434 216 18...... 458 Kflfi ion tot) 700 1 490 1,010 l.OOQ 440 351 207 19...... 440 460 Iftfi 170 1,000 1,670 440 153 526 300 199 20...... 434 400 ISA 160 1,000 1,960 735 142 S26 247 187 U...... 416 OQA 1 Qfi 150 1,100 2,360 2,780 125 1,060 195 175 22...... 538 150 1,100 3,840 1,360 125 932 167 1«4 23...... 700 340 180 140 1,200 4,700 2,160 959 735 157 157 24...... 772 340 IDA '140140 1,400 5,530 1,540 399 595 197 406 26...... 735 340 180 1,500 4,230 1,440 464 488 229 368 26...... 340 140 2,000 2,760 1,660 383 399 211 229 27...... 340 190 140 536 1,210 330 199 179 28...... 320 190 140 2,800 2,720 810 810 271 187 164 29...... 320 190 140 3,000 3,200 1,220 530 216 179 171 30...... , 300 190 3,000 3,760 1,200 399 234 187 . 187 31...... 280 2,800 266 280 207 NOTE. Stage-discharge relation affected by ice, Dec. 30,1918, to Mar. 30,1919; discharge for this period is approximate. Daily discharge estimated, Oct. 1, Nov. 29 to Dec. 5,1918, Mar. 31,1919, to Apr. 5, Apr. 30, May 18,19, June 1, July 4,5,20 and 21,19ia J *Braeed figures show mean discharge for periods included, determined by hydrograph comparison with flow of Hudson at North Creek, minus flow of Indian River near Indian take. Water-stage recorder did not operate Oct. 26,1919, to Nov. 30} 1919, Jan. 10-22,1920, Feb. 8-19, 25-29 and Mar. 1-4,1920. Discharge, Oct. 26-31,1919, estimated at 1,020 second-feet, and Nov. 1-30,1919,910 second- feet, by comparison with the record derived by subtracting the discharge of Indian River near Indian Lake from that of Hudson River at North Cieek. Discharge, Dec. 4,1»1», to Mar. 26,1920, determined from gage heights corrected for ice effect by means of four discharge measurements, and study of gage height graph and weather records and comparison with records for the station at North Creek and Indian River near Indian Lake. Discharge, Apr. 27,1920, to June 3,1920, determined from gage heights corrected for backwater from logs, on basis of current-meter measurement on May 12. , 182 SURFACE WATER SUPPLY, 1919-1&20, PART I. Monthly discharge of Hudson River at Gooley, near Indian Lake, N".' Y., for the ye&rs ending Sept. 30, 1919, and 1920. [Drainage area, 418 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 3,660 476 1,170 2.80 3.23 2,600 530 1,140 2.73 3.05 1,390 550 901 2.16 2.49 800 180 443 1.06 1.22 300 200 242 .579 .60 March...... 2,400 240 713 1.71 1.07 April...... 9,490 800 2,650 6.34 7.07 May...... 2,120 5.07 5.84 1.150 234 485 1.16 1.29 July...... 428 104 264 .632 .73 234 80 160 .383 .44 1,200 167 456 1.09 1.22 The year ...... 9,490 80 897 2.15 29.15 1919-20. 256 630 1.51 1.74 November...... 910 2.18 2.43 798 280 480 1.15 1.83 260 100 164 .392 .45 190 140 163 .390 .42 March...... 3,000 140 991 2.37 2.73 5,530 1,020 2,610 6.24 6.96 May...... 2,780 266 1,260 3.01 3.47 1,510 96 493 1.18 1.32 July...... 1,060 216 471 1.13 1.30 562 146 255 .610 .70 406 153 206 .493 .55 5,530 96 718 1.72 23.40 HUDSON RIVER AT HOBTH CREEK, H. Y. LOCATION. At two-span steel highway bridge in village of North Creek, Warren County, immediately above mouth of North Creek. DRAINAGE AREA. 804 square miles. RECORDS AVAILABLE. September 21, 1907, to September 30, 1920. ' GAGE. Chain at upstream side of left span of the bridge; read by William Alexander. DISCHARGE MEASUREMENTS. Made from the upstream side of the highway bridge. CHANNEL AND CONTROL. Heavy gravel; fairly permanent. EXTREMES OP DISCHARGE. Maximum stage recorded for year ending September 30, 1919, 8.5 feet at 7.30 a. m. April 12 (discharge, about 13,800 second-feet); mini mum stage recorded 2.25 feet, at 8 a. m. July 6, and 6 p. m. September 6 (discharge- 302 second-feet). Maximum stage recorded for year ending September 30,1920, 7.52 feet at 7.30 a. m. April 24 (discharge, 10,700 second-feet); minimum stage recorded, 2.10 feet, morning and evening, June 12, 22, and 23 (discharge, 230 second-feet). 1907-1920: Maximum stage recorded, 12.0 feet, during the evening of March 27, 1913 (discharge, about 30,000 second-feet); minimum stage, 2.05 feet at 7.05 a. m. September 30, 1913 (discharge, 168 second-feet). ICE. Stage-discharge relation affected by ice. REGULATION. The numerous lakes and ponds in the basin of the upper Hudson, especially the reservoir at Indian Lake, have a decided effect on the low-water flow. Many of the reservoirs are vused to make flood waves in the spring in con nection with log driving. HUDSON RIVER BASIN. 183 ACCURACY. Stage-discharge relation practically permanent; affected by ice from December 20, 1919, to March 25, 1920. Eating curve well defined between 250 and 6,000 second-feet. Gage read to half-tenths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Open-water records good except for log-driving season when mean daily gage height com puted from two gage readings may be in error owing to large variations in stage caused by operation of sluice gates in logging dams above station. Records fair for period of ice effect. Discharge measurements of Hudson River at North Creek. N. Y., during the years ending Sept. SO, 1919 and 1920. Dis- Gage Dis Date. Made by height. charge. Date. Made by- height. charge. 1919. Feet, Sec.-ft. 1920. Feet Sec.-ft. Jan. 14 E. D. Burchard. .... 2,75 665 Jan. 2 Da vison and Howe. .... 03.52 1,280 Feb, 10 .....do...... o3.31 1.160 3 .....do...... o3.50 1,170 May 9 O. W. Hartwell...... 5.46 4,790 26 B. F.Howe..,...... o3.53 1,010 .....do...... 4.59 3,280 Feb. 17 03.66 835 Mar. 12 .....do...... o4.30 811 May 11 .....do...... 5.68 5,800 o Stage-discharge relation affected by ice. - Daily discharge, in second-feet, of Hudson River at North Creek, JV. Y., for the years ending Sept., SO, 1919 and 19W. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1,220 4,010 1,350 1,100 1,100 1,100 3,050 3,230 2,370 610 425 940 2...... 1,100 3,230 1,220 1,040 1,100 1,160 2,530 1,350 1,620 530 390 1,100 1,160 2,700 1,100 1,350 1,100 1,220 2,210 2,870 1,840 342 360 990 4...... 940 2,700 1,100 1,160 1,040 1,420 2,060 2,530 990 330 330 530 5...... 940 2,210 990 990 990 1,350 1,760 4,440 700 330 330 342 6...... 1,420 1,480 890 990 990 1,220 1,760 5,120 610 446 655 vtn 4.440 1,220 790 890 1,160 990 3,230 2,140 700 610. 610 610 8...... 4,660 1,220 790 890 1,350 990 4,010 5,360 990 6101 610 745 9...... 3,420 1,160 745 790 1,350 990 3,810 4,440 890 570 530 2,060 iO...... 2,210 1,100 700 700 1,350 990 5,120 3,230 790 655 790 2,370 11...... 1,910 1,100 700 745 1,160 1,040 9,100 1,690 610 1,100 700 1,910 19 1,620 1,100 700 700 1,220 990 13,400 1,840 530 745 610 1 480 13...... >...... 1,480 990 700 700 1,220 940 8,240 1,760 530 530 840 1^280 14...... 1,350 890 700 655 1,160 790 5,360 2,060 530 425 890 1,100 15...... 1,100 840 840 700 1,220 790 4,010 1,910 700 390 790 840 16...... 1,160 790 1,220 700 1,160 745 4,660 3,230 790 610 790 700 17...... 1,100 745 1,220 890 1,100-' 745 7,400 2,210 1,480 610 890 610 18...... 1,100 890 1,100 790 1,160 745 <5 K4fl 2,870 1,100 610 1 040 700 19...... 990 2,060 1,100 610 1,160 1,350 3,230 3,230 940 530 ijioo 790 20...... 990 2,700 990 610 1,160 1,760 2,870 2,870 700 495 1,160 TOO 21...... 890 2,700 990 745 1,220 2,210 3,610 2,530 610 460 1,100 son 22...... 1,100 2,530 990 1,100 1,100 3,230 3,810 3,420 700 530 840 1,160 23...... 1,350 2,060 1,100 1,220 1,040 3,230 3,610 5,600 700 530 530 1,220 24...... 1,420 1,690 1,910 1,350 1,100 3,420 8,610 6,600 790 4fln ?on son 25...... 1,220 1,480 1,980 1,620 1,220 2,870 2,870 5,600 610 460 1,160 790 26...... 1,100 1,220 1,980 1,760 1,100 2,630 3,810 4,840 655 425 1,220 700 27...... 1,100 1,100 1,760 1,480 1 040 3 01 A 2,870 5,360 745 404 1,100 610 28...... 1,350 1,100 1,350 1,480 I'lOO 5,360 2,700 3,420 i fun 530 890 7on 29...... 1,350 MOO 1,220 1,350 5,360 4,220 2,530 700 530 790 840 30...... 1,280 1,350 1,160 1,220 ...... 5,120 3,230 2,210 610 530 700 745 31...... 3,420 1.100 1.160 4.010 1.760 446 700 184 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Hudson River at North Creek, N. Y., for the years ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May.. June. July. Aug. Sept. 1919-20. 1...... 700 2,530 1,350 1,300 1,000 750 4,010 6,340 1,100 460 1,100 1,220 2...... 840 2,700 1,420 1,300 1,000 709 4,660 4,890 940 460 1,100 1,220 3...... 890 2 i7ft 1.160 1 400 1,000 650 4,660 3,230 1,220 446 1, MO- , 945 4...... 790 2,060 990 l',300 950 650 4,010 3,420 2,870 460 990 530 5...... 840 1,980 940 1,200 950 700 4,440 2,210 570 495 890 330 6...... 1,350 1,910 890 1,200 950 750 5,840 3,610 404 570 790 990 7...... 1,220 1,620 990 1,200 900 900 4,660 4,890 460 840 840 1,040 8...... 1,220 1,350 940 1,200 900 950 3,230 3,610 1,040 1,220 1,040 990 9...... 1,160 1,160 940 1,200 900 950 2,370 2,210 2,140 1,220 1,100 990 10...... 1,040 1,100 890 1,200 850 950 2,080 1,910 286 1,160 1,100 990 11...... 1,100 1,100 1,040 1,200 800 950 1,910 4,890 252 1,100 1,220 745 12...... 1.040 1,220 1,100 1,000 800 1,000 1,690 2,370 230 1,140 1,220 840 13...... 890 1,760 1,160 1,000 800 1,100 2,210 700 275 840 990 940 14...... 790 1,910 1,280 1,100 700 1,200 5,120 700 446 700 700 940 15...... 745 2,210 1,280 1,100 750 1,300 4,010 2,060 495 700 1,100 890 16...... 700 1 980 1,280 1,100 QAA 1,400 3,610 700 530 610 1,100 460 17...... 745 l'840 1,220 1,200 800 1,500 3,610 1,620 610 570 990 530 18...... 790 1,480 1,100 1,200 800 1,400 3,610 2,370 2,870 610 890 570 19...... 745 1,280 940 1,200 750 1,600 4,440 1,420 610 1,840 840 890 20...... 655 1,100 850 1,200 650 1,600 5,360 1,160 330 1,480 790 940 21. 655 1,040 1,200 1,100 650 1,800 4,890 3,230 275 1,350 745 890 22...... 940 890 1,200 1,000 600 1,800 10,000 1,480 230 1,280 890 890 23...... 1,100 890 1,200 1,000 600 2,000 6,600 1,350 230 1,100 1,100 890 24...... 1,220 890 1,100 1,100 550 2,200 9,100 2,210 700 840 990 1,040 25...... 1,160 840 1,000 1,100 500 2,400 5,360 1,760 610 700 1,040 790 26...... 1,100 790 1.000 1,000 500 2,700 5,840 5,600 530 610 990 890 27...... 1,550 790 950 1,000 750 3,610 4,010 1,100 1,480 530 990 890 28...... 1,690 790 850 1,000 900 4,890 4,220 2,140 1,910 610 890 890 29...... 1,690 745 800 ftsn 750 5,120 5,360 2,210 940 700 990 700 30...... 1,760 1,040 950 1,000 4,890 7,960 2,060 610 790 1,100 530 31...... 1,910 1,200 1 ' 000 4,440 840 890 1,100 NOTE. Discharge, Dec. 20,1919 to Mar. 25,1920, determined from gage heights corrected for ice effect by means of five dissharge measurements, observer's notes, and weather records. Monthly discharge of Hudson River at North Creek, N. Yl, for the years ending Sept. 30, 1919 and 1920. [Drainage area, 804 square miles.] Discharge in second-feet. * Month. Per Run-off Maximum. Minimum. Mean. square in inches. mile. 1918-19. 4,660 890 1,610 2.00 2.31 4,010 745 1,650 2.05 ^ 2.2» 1,980 700 1,110 1.38 1.5& 1,760 610 1.020 1.27 1.46 1,350 990 1,150 1.43 1.4* March...... 5,360 745 2,020 2.51 2..» 13,400 1,760 4,270 5.31 5.92 Mav 6,600 1,360 3,300 4,10 4.73. 2,370 530 886 1.10 1.23 July...... 1,100 330 528 .657 .76 1,220 330 763 .949 1.09- September ...... 2,370 330 962 1.20 4.34 The year ...... 13,466 330 1,600 1.99 27.10 1919-20. . - 1,910 655 1,070 1.33 1.53. 2,700 745 1,450 1.80 2.01 1,420 800 1,070 1.33 1.53. 1,400 950 1,130 1.41 1.63- 1,000 500 788 .980 1.06 5,120 650 1,840 . 2.28 2.63 April...... 10,000 1,690 4,630 S.76 6.43. May...... 6,340 700 2,530 3.15 3.63 2,870 230 840 1.04 1.16 July...... 1,840 446 849 1.06 1.22. 1,220 700 991 1.23 1.42 September...... 1,220 330 846 1.05 1.17 10,000 230 1,500 1.87 25. 4£ NOTE. The monthly discharge in second-feet per square mile and run-off in inches shown by the table do not represent the natural flow from the basin because of artificial storage, mainly in Indian Lake reser voir. The yearly discharge and run-off doubtless represent more nearly the natural flow. HUDSON RIVER BASIN.. 185 HUDSON RIVER AT THTJRMAN, N. Y. LOCATION. At Delaware & Hudson Railroad bridge near Thurman railroad station, Warren County, half a mile below mouth of Schroon River and 13 miles above mouth of Sacandaga River. DRAINAGE AREA. 1,550 square miles. RECORDS AVAILABLE. September 1, 1907. to September 30, 1920, when station was discontinued. <*AGE. Chain at upstream side near center of left span; read by William E. Daggett. DISCHARGE MEASUREMENTS. Made from upstream side of bridge. CHANNEL AND CONTROL. Bed composed of sand and gravel; fairly permanent. EXTREMES OF DISCHARGE. Maximum stage recorded for year ending .September 30, 1919, 8.25 feet at 9 a. m. April 12 (discharge, 18,600 second-feet); minimum stage recorded 2.2 feet at 9 a. m. August 3, (discharge, 460 second-feet). Maximum open-water stage recorded for year ending September 30, 1920, 7.28 feet in afternoon of April 22 (discharge, 14,800 second-feet); minimum stage recorded, 2.10 feet in afternoon of September 5, and morning of September 6 (discharge, 485 second-feet). 1907-1920: Maximum stage, 12.5 feet, during late evening March 27, 1913, determinedly leveling from flood marks (discharge, about 46,000 second-feet); minimum stage recorded, 2.12 feet at 8.55 a. m. and 6.20 p. m. September 30, 1913 (discharge, about 290 second-feet). ICE. Stage-discharge relation affected by ice. REGULATION. Discharge is regulated to some extent by the storage reservoirs at Indian and Schroon lakes and the mills on Schroon River. ACCURACY. Stage-discharge relation practically permanent between shifts; affected by ice during large part of the period from December to March, and by logging during spring and summer. Stage-discharge relation changed sometime during high water in last of March or early in April, 1920. Rating curves used before and after change in control are well defined between 550 and 20,000 second-feet. Gage read to half-tenths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Open-water records good; winter records fair. COOPERATION. Gage-height record furnished by the International Paper Co. Discharge measurements of Hudson River at Thurman, N. Y., during the years ending Sept. 30, 1919 and 1920. Dis Gage Dis Date. Made by «& charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1919. Feet. Sec.-ft. Oct. 26 Q3.41 1,980 2.39 584 Nov. 15 .....do...... 3.38 2,030 .....do...... 2.33 576 1919. 1920. Feb. 13 .....do...... 64.75 1,470 68.09 1,310 Mar. 13 J.W.Moulton...... 64.12 2,050 Aug. 20 2.92 1 290 May 10 4.43 4,460 B. F.Howe...... 2.98 l|330 Aug. 14 2.93 1,180 3 .....do...... 2.96 1,290 o Stage-discharge relation affected by logs. * Stage-discharge relation affected by ice. 186 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Hudson River at Thurman, N. Y.,for the years ending Sept. 30, 1919 and 19ZO. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 2.010 6,460 2,780 2,120 6,780 3,610 3,360 1,280 1.060 1,130 2...... 1,530 5.540 2,440 2,660 5,840 3,120 3,240 1,200 1,000 1,620 1,280 4,950 2,440 2,550 5,540 3,610 2,660 1,000 460 1,440 4...... 1,360 4.390 2,440 2,550 5,840 3,860 2,660 880 880 1,280 5...... 1,440 4,120 2,220 2,010 4,670 8,440 2,010 735 880 610 6...... 1,720 3,610 2,010 4,670 5,540 1,440 780 940 530 7...... 4,120 3,240 2,120 6,150 5,240 1,360 1,280 830 735 6,460 3,000 2,010 6,780 4,670 1,620 1,280 880 880 9...... 5,240 2,660 1,810 7,760 8,440 2,120 1,000 940 2,220 10...... 3,860 2,440 1,810 8,790 3,860 2,010 1,000 690 3,120 11...... 3,000 2,440 1,720 11,000 3,360 1,810 2,010 1,060 3,120 12...... 2,780 2,120 1,620 18,400 5,540 1,720 1,810 940 2,330 13...... 2,780 1,910 2.010 13,300 3,860 1,530 780 1,000 2,010 14...... 2,550 1,910 1,910 11,400 4,390 1,810 780 1,130 2,010 15...... 2,220 1,810 2,33u 1,710 9,500 3,360 1,360 940 1,000 1,440 16...... 1,360 1,910 2,440 3,950 8,440 3,860 1,620 1,130 1,000 1,280 17...... 1,280 1,810 2,660 9,500 3,610 2,890 1,280 1,060 1,280 1ft 1,810 1,910 2,440 10,200 5,540 2,220 1,280 1,280 1,130 1,440 4,120 2,010 1,880 7,430 6,460 2,010 1,280 1,360 1,280 1,360 5,540 1,910 780 1,620 1,280 20...... 4,670 1,910 5,840 i, 21...... 1,200 4,950 1,810 6,460 4,950 1,530 1,200 1,620 1,200 22...... 1,530 4,670 1,910 6,150 5,540 1,440 1,280 1,440 1,280 23...... 1,810 4,120 2,220 5,540 9,140 1,440 1,530 940 1,720 24...... 2,220 3,860 2,890 5,840 10,200 1,440 1,280 940 1,810 25...... 2,220 3,360 2,890 3,860 9,500 1,440 1,280 1,620 1,280 26...... 2,120 3,000 3,360 5,240 8,790 1,130 1,280 1,720 1,200 27...... 1,910 2 660 3,360 5,240 9,140 1,910 1,000 1,530 1,130 28...... 2,120 2^550 3,000 4,950 7,430 1,720 1,280 1,130 1,130 29...... 2,120 2,550 2,330 5,840 5,540 1,440 1,200 1,000 1,200 30...... 2,220 2,660 2,220 4,390 4,950 1,280 1,130 1,000 1,200 31...... 4,950 1,810 4,120 1,200 1,060 1919-20. 1...... 1,200 3,360 3,000 1,400 1,300 1,600 12,000 8,440 2,720 960 1,460 2...... 1,280 3,610 2,780 1,600 1,300 1,400 13,300 6,470 2,480 1,550 1,460 1,360 3,360 2,330 1,800 1,200 1,100 19 win 6,170 2,260 960 1,380 1,280 1,910 2,000 1,200 1,100 10,200 6,170 2,040 960 680 1,280 3,120 1,810 2,000 1,500 1,100 9 NOTE. Discharge, Jan. 6, 1919, to Mar. 31, 1919, Dec. 7,8, 1919. and Dec. 11, 1919, to Apr. 1. 1920, deter mined from gage heights corrected lor ice efEect by means of discharge measurements, weather records, and comparison with record at North Creek. No gage-height record July 1-9, 1920; discharge estimated from study of North Creek record. Braced figures show mean discharge for period included. HUDSON HIYER BASIN. 187 Monthly discharge of Hudson River at Thurman, N. Y.,for the years ending Sept. SO, 1919 and 1920. [Drainage area, 1,550 square miles.] Discharge in second-feet. Run-off in Month. Per inches. Maximum. Minimum. Mean. square mile. 1918-19. 6,460 1,200 2,390 1.54 1.78 6,460 1,810 3,310 2.14 2.39 3,360 1,620 2,290 1.48 1.71 January ...... 1,960 1.26 1.45 1,710 1.10 1.14 March ...... 3,950 2.55 2.94 April...... 18,400 3,860 7,380 4.76 5.31 May...... 10,200 3,120 5,650 3.65 4.21 3,360 1. 130 1,870 1.21 1.35 July...... 2,010 735 1,170 .755 .87 1,720 460 1,100 .710 .82 3,120 530 1,460 .942 1.05 18,400 460 2,860 1.85 25.02 1919-20. 2,660 1,130 1,660 1.07 1.23 3,860 1,620 2,540 1.64 1.83 3,000 1,400 2,, 010 1.30 1.50 2,000 1,200 1,480 .955 1.10 1,700 800 1,190 .768 .83 12,000 1,100 3,440 ... 2.22 2.56 Ajwil...... 13,300 5,290 9,770 6.30 7.03 May...... 9,500 2,480 4,550" 2.94 3.39 3,590 760 1,620 1.05 1.17 July...... 1,740 610 1,160 .749 .86 1,5&) 578 1,100 .710 .82 1,460 545 906 .584 .65 The year ...... 13,300 545 2,620 ] 1.69 22.97 NOTE. The monthly discharge in second-feet per square mile and run-off in inches shown by the table do not represent the natural flow from the basin because of artificial storage. The yearly discharge and run-off doubtless represent very nearly the natural flow. 188 SURFACE WATER SUPPLY, 1919>-1920, PART I. HUDSON RIVER AT SPIER FALLS, S. Y. LOCATION. Half a mile below Spier Falls dam, Saratoga County, and 11 \ miles below mouth of Sacandaga River. DRAINAGE AREA. 2,800 square miles (measured on topographic maps.) RECORDS AVAILABLE. October 7, 1912, to September 30, 1920. GAGE. Gurley 2-day water-stage recorder in brick shelter on the right bank. Re corder inspected by T. F. Malone, employee of Adirondack Electric Power Cor poration. DISCHARGE MEASUREMENTS. Made from a cable about 1,000 feet downstream from the gage. CHANNEL AND CONTROL. Bed composed of coarse gravel and boulders. Control probably permanent. EXTREMES OF DISCHARGE. Maximum stage, from water-stage recorder, for year end ing September 30, 1919, 11.64 feet at 1 and 6 a. m. April 13 (discharge, 32,000 second-feet); minimum stage, 0.99 foot at 4 and 5 a. m. August 16 (discharge, 155 second-feet). Maximum stage from water-stage recorder, for year ending September 30, 1920, 11.03 feet at 1 a. m. April 1 and 8 p. m. April 3 (discharge, 29,000 second-feet); minimum stage, 1.05 feet, 3 to 5 a. m. February 29 and 4 to 5.30 a. m. Septem ber 9 (discharge, 170 second-feet). 1912-1920: Maximum stage from water-stage recorder, 18.59 feet at 12.25 a. m. March 28, 1913 (discharge, about 89,100 second-feet); minimum stage, 0.12 foot at 4 p. m. September 23,1917 (discharge, about 5.5 second-feet). ICE. Stage-discharge relation not affected by ice except for a short time during extremely cold periods. REGULATION. Large diurnal fluctuation in discharge is caused by operation of the Spier Falls power plant. Seasonal flow affected by storage at Indian Lake and many small lakes and reservoirs in the upper part of the drainage basin. DIVERSIONS. Water is diverted from Hudson River through the Glens Falls feeder and the, old Champlain canal into the summit level of the Barge Canal. A part of the diverted water flows north into Lake Champlain. No correction has been made for this diversion. ACCURACY. Stage-discharge relation practically permanent; not affected by ice during either year. Rating curve well defined for all stages except about 9 feet, where curve may be 4 or 5 per cent too large. Operation of the water-stage recorder satisfactory throughout both years. Daily discharge ascertained by averaging the results obtained by applying gage heights for one-hour intervals to the rating table. Records good. Discharge measurements of Hudson River at Spier Falls, N. Y., during the years ending Sept. SO, 1919 and 1920. Gage Dis Date. Made by height. charge. 1919. Feet. Sec.-ft. May 11 O. W. HartweU...... 5.99 8,380 1920. May 7 6.59 10,400 : HUDSON BIFER BASIS'. Daily discharge, in second-feet, of Hudson River at Spier Falls, N. Y., for the years Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 4,070 12,600 4,940 5,230 3,190 2,070 15,700 7,480 5,900 2,700 1,950 2,000 2...... 3,700 12,200 4,610 6J)80 2,810 3,790 13,200 8,500 6,280 2,780 2,560 3.290 3...... 2,780 11,000 3,860 6^70 3,230 4,150 11,300 9,120 4,480 2,730 878 2,950 4...... 3,290 9.730 4,170 6,480 2,890 4,250 10,400 9,880 4,220 1,000 1,660 2,810 5...... 2,750 8,570 4,020 4,480 2,860 5,030 9,680 12,000 3,910 1,080 1,430 2,440 6...... 2,210 7,510 3,700 3,980 2,980 5.530 9,810 11,400 2,760 839 1,350 1,950 7...... 4,810 6,430 2,670 3/810 2,990 5,350 11,600 12,600 2,310 1,990 1,010 900 8...... 8,320 6,240 1,670 4,050 2,180 5,070 13,700 9,230 1,640 2,310 1,470 2,200 9...... 7,340 4,620 4,280 4,030 2,160 5,570 15,600 13,500 3,170 1,950 1,700 3,010 10...... 5,900 4,430 2,700 3,900 3,420 7,820 16,200 9,150 3,080 2,220 832 3,770 11...... 4,500 4,420 2,980 3,150 2,660 7,820 19,800 8,900 3,080 3,230 1,580 4,660 12...... 4,100 5,250 2,420 2,900 2,270 7,210 29,400 9,530 3,060 2,840 1,800 4,600 13...... 3,780 3,770 2,940 3,240 2,330 7,320 30,900 9,910 2,650 2,940 1,430 3> 890 14...... 3,980 3,490 3,400 2,250 2,540 6,200 26,700 9,290 2,360 3,230 1,400 2,050 15...... 3,480 3,230 3,500 3,040 2,120 5,500 22,100 9,040 1,390 2,180. 1,790 3,510 16...... 2,920 3,500 5,380 2,820 1,710 4,990 18,000 8,350 3,190 1,540 1,490 2,120 17...... 2,440 2,730 5,720 3,200 3,240 4,760 18,800 8,400 3,370 2,360 920 1.950 18...... 2,310 »,940 5,250 3,010 2,740 5,230 18,700 9,420 3,830 3,010 2,160 2,020 19...... 2,460 7,600 4,680 2,700 2,430 7,600 15,400 11,300 3,310 2,260 1,700 2,020 20...... 1,620 9,700 4,230 2,500 2,170 9,080 14,300 10,500 3,000 1,040 2,420 1|990 21...... 2,470 9,770 3,400 2,300 2,720 11,200 12,700 9,260 2,460 1,800 3,010, 1.440 22...... 3,590 8,960 3,410 2,640 1,700 13,500 12,600 10,700 1,820 3,000 2,880 2,740 23...... 3,630 7,940 5,500 2,850 1,400 13,900 9,780 16,300 2,760 3,580 1,870 2,920 24...... 4,370 6,910 6,700 4,040 2,740 14,400 10,100 18,100 2,100 3,100 722 3,340 25...... 3,740 6,060 9,290 4,700 2,300 14,800 8,940 18,500 1,920 2,190 2,180 3,490 26...... 4,050 5,190 12,100 5,030 2,230 13,200 9,420 16,700 1,860 1,900 2,460 3,500 27...... 2,300 4,760 11,500 5,020 2,390 13,100 9,270 16,200 2,280 905 2,800 2; 120 28...... 4,130 3,260 9,900 4,670 2,340 21,200 7,620 13,600 2,780 2,360 1,800 1.42C 29...... 3,740 4,5SO 8,240 4,200 20,300 8,430 10,900 3,800 3,100 2,370 2,980 30...... 4,240 4,720 6,640 3,940 20,000 7,790 8,640 3,140 2,520 2,180 2,010 31...... 7,230 5,240 3,680 18,300 7,340 2,150 738 1919-20. 1...... 2,110 6,970 7,600 1,960 1,740 2,000 25,200 18,700 4,120 1,450 1,260 1,580 2...... 2,100 8,190 7,180 2,820 2,120 1,910 25,700 15,300 2,610 1,300 2,440 1,980 3...... 2,570 8,200 6,030 3,320 2,020 1,850 27,300 13,400 2,530 3,030 2,210 2,080 4...... 2,730 7,480 4,450 1,280 2,210 1,330 26,200 12,600 3,320 2,880 1,890 2,000 5...... 1,660 8,090 4,400 2,640 2,040 1,830 24,500 10,200 3,570 335 2,000 892 6...... 3,430 8.140 4,080 2,400 2,170 1,380 27,000 8,820 1,020 1,520 1,820 638 7...... 3,450 7,410 2,590 2,300 1,680 1,620 25,400 9,410 2,640 1,940 1,730 1,790 8...... 4,720 6,260 4,290 2,340 1,660 2,030 21,000 7,200 1,990 1,850 718 1,500 9...... 4,020 5,480 4,250 2,930 2,240 2,290 17,500 7,530 3,580 2,810 1,950 1,640 10...... 3,630 5,290 4,920 2,830 2,090 2,360 14,600 6,710 2,980 2,210 1,880 1,560 11...... 4,240 4,770 4,900 1,210 1,690 2,760 12,600 8,050 1,470 1,560 1,780 2,100 12...... 3,290 4,550 4,700 2,660 1,860 3,000 11.400 7,780 1,640 2,980 2,320 861 13...... 4,290 6,580 4,700 2,370 1,850 2,850 15,600 6,780 1,900 2,430 3,490 1,760 14...... 3,501) 8,570 5,870 2,250 2,080 2,160 21,700 5,270 2,440 2,650 2,580 2,080 15...... 2,280 8,820 5,900 2,350 1, 810 4,770 20,900 4,700 1,420 2,580 2,770 2,070 16...... 2,550 8,130 5,010 2,050 1,860 4,140 20,400 5.660 1,720 2,360 4,230 1,610 17...... 3,560 7,550 4,440 1,890 2,020 4,880 21,500 5,160 2,050 2,160 3,180 1,670 18...... 3,850 6,500 3,800 1,580 1,930 5,600 21,200 5,480 3,560 1,000 2,910 2,050 19...... 3, 670 5,850 3,320 2,350 1,680 6,170 19,600 4,480 3,510 3,000 2,230 865 20...... 3,540 5,450 3,230 2,240 1,750 5,570 18,300 4,500 1,990 3,670 2,280 1,510 21...... 3,600 4,740 2,200 2,140 2,180 4,970 18,800 4,430 2,780 3,710 1,630 1,750 22...... 4,240 3,870 3,520 1,980 1,010 5,490 21,800 7,750 2,160 3,680 . 582 1,540 23...... 4,680 2.770 3,440 2,320 1,710 4,840 23,400 6,330 2,180 3,090 2,470 1,400 24...... 5,780 4,510 3,760 1,910 1,600 5,820 24,600 7,420 2,660 2,720 1,440 1,710 25...... 5,700 4,450 1,870 1,760 1,650 8,580 24,300 6,410 2,560 960 1,840 1,440 26...... 4,440 4,180 3,280 2,260 1,960 11,400 20,000 7,690 2,550 2,610 1,610 1,100 27...... 5,380 3,220 2,600 1,700 1,930 15,600 17,500 6,180 815 1,800 1.610 1.790 28...... 5,370 5,400 1,800 2,240 2,070 18,600 18,200 4,620 2,350 1,850 1,960 1,580 29...... 5,660 5,200 3,130 2,400 442 22,200 19,400 3,920 2,410 1,410 930 1,720 30...... 5,890 6,120 2,220 2,270 24,200 20,500 4,990 1,760 1,850 1,660 2,010 31...... 5,650 2,340 1,870 ...... 25,900 4,370 1,540 1,970 190 SURFACE WAfER SUPPLY, 1919-1920, PART I. Monthly discharge of Hudson River at Spier Falls, N. Y., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 2,800 square miles.] Discharge in second-feet. Run-off in Month. Per inches. Maximum. "Minimum. Mean. square » mile. 1918-19. 8,320 1,620 3,880 1.38 1.59 12,600 2,730 6,440 2.30 2.57 12,100 1,670 5,130 1.83 2.11 6,570 2,250 3,890 1.39 1.60 3,420 1,400 2,530 .904 .94 March...... 21,200 2,070 9,300 3.32 3.83 April...... 30,900 7,620 14,600 5.21 5.81 May...... 18,500 7,340 11,100 3.96 4.56 6,280 1,390 3,060. 1.09 1.22 July...... 3,580 839 2,280 .814 .94 3,010 722 1,760 .629 .73 4,660 900 2,670 .964 1.06 The year ...... '...... 30,900 722 5,550 1.98 26.96 1919-20. 5,890 1,660 3,920 1.40 1.61 8,820 2,770 6,090 2.18 2.43 7,600 1,800 4,060 1.45 1.67 3,320 1,210 2,210 .789 .91 2,240 442 1,830 .654 .71 March...... 25,900 1,330 6,710 2.407.46' 2.77 April...... 27,300 11,400 20,900 8.32 May...... 18,700 3,920 7,480 2.67 3.08 4,120 815 2,410 .861 .96 July...... 3,710 335 2,220 .793 .91 4,230 582 2,040 .729 .84 2,100 638 1,610 .575 .64 The year...... 27,300 335 5,110 1.82 24.85 NOTE. The monthly discharge in second-feet per square mile 'and run-off in inches shown by the table do not represent the natural flow from the basin because of artificial storage. The yearly discharge and run off doubtless represent very nearly the natural flow. HUDSON RIVER AT. MECHANICVILLE, N. T. LOCATION. At Duncan dam of West Virginia Pulp & Paper Co., in Mechanicville, Saratoga County, 3,700 feet above mouth of Anthony Kill, \\ miles below mouth of Hoosic River, and 9 miles above mouth of Mohawk River. DRAINAGE AREA. 4,500 square miles. RECORDS AVAILABLE. 1888 to September 30,1920. GAGE. Water-stage recorder at the dam, installed in 1910; previous to that date, staff COMPUTATIONS OP DISCHARGE. Discharge over spillway determined from a rating curve based on coefficients derived by United,,States Geological Survey for dams of ogee section. Discharge through turbines computed from records of their operation. Discharge at lock and through Barge canal turbines at lock computed from records of the number of lockages a day. EXTREMES OF DISCHARGE. Maximum daily discharge for year ending September 30, 1919, 31, 600 second-feet, April 13: minimum daily discharge, 1,060 second-feet September 1. Maximum daily discharge for year ending September 30, 1920, 36,100 second- feet, April 6; minimum daily discharge, 1,090 second-feet, September 26. 1888-1920: Maximum discharge 120,000 second-feet at 6 a. m. March 28, 1913. The plant is occasionally shut down and the flow of the river stored in the pond so that the discharge below the station becomes practically zero. DIVERSIONS. Water is diverted from Hudson River through the Glens Falls feeder and the old Champlain canal into the summit level of the Barge Canal. A part of the diverted water flows north into Lake Champlain. No correction has been made for this diversion. COOPERATION. Discharge over the spillway and .through turbines of the Wort Virginia Pulp & Paper Co. furnished by Mr. W. J. Barnes, engineer of the company. HUDSON RIVER BASIN. 191 Dotty discharge, in second-feet, of Hudson River at Mechanicville, N. Y., for At years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 6,410 14,400 6,830 8,690 5,000 10,400 14,700 9,340 6,900 3,680 2,620 1,060 2...... 5,660 14,800 6,800 13,400 3,580 7,190 12,500 9,990 8,480 2,910 2, 110 2,300 3...... 4,460 13,300 5,440 11,400 4,770 6,490 11,400 10,100 7,180 2,890 2,080 3,740 4...... 4,920 13,100 5,340 10,400 4,450 5,820 11,500 10,300 6,090 1.980 1,740 3,500 5...... 4,000 11,600 6,070 7,760 4,210 8,270 11,000 14,400 5,390 2,040 1,840 3,250 6...... 3,260 10,300 5,280 6,960 3,670 7,660 10,600 13,400 4,990 1,700 2,040 2,750 7...... 4,780 8,460 4,660 6,600 3,980 7,240 12,700 14,400 4,000 1,840 1,590 1260 8...... 9,190 7,660 4,190 6,680 3,710 6,490 14,100 11,700 3,070 2,100 1*410 1,»« 9...... 8,900 6890 3.390 6,520 2,280 8,800 14,700 13,700 4,020 2,210 1,420 3 210 10...... 7,460 6,280 4,890 6,220 3,150 12,400 14,900 11,800 5,200 2,520 1,450 4,670 11...... 6,480 5.870 4,340 5,340 3,760 10,400 17,300 11,800 4,620 3,080 1,330 5,950 12...... 5,490 6,380 4,080 4,140 3,300 9,010 27,300 ,11,300 4,170 4,200 1,680 5,910 13...... 4,940 6 190 4,270 4,880 2,890 7,760 31,600 '12,200 3,930 1,840 1,750 5*60 14...... 4,920 4,380 4,610 4,960 3,040 6,460 29,400 10,800 3,320 3,660 1,860 4,870 15...... 4,970 3,770 8,420 4,560 3,480 6,860 23,300 11^000 2,340 3,010 1,350 8,220 '16...... 4,200 4,620 11,400 4,680 2,160 5,980 20,300 9,840 2,920 2,590 1,820 4,780 17...... 3,780 3,520 9,750 4,380 3,280 7,250 20,400 10,700 3,760 2,060 1,220 3,420 18...... 3,480 8,320 7,950 4,730 3,540 9,040 20,200 13,800 4,940 1,900 1,400 3^450 19...... 3,100 12,200 7,170 3,730 3,380 10,700 17,300 13,800 4,500 3,050 2,370 2,660 20...... 1,520 13,400 6,740 4,960 2,790 10,900 15,900 12,500 4,200 1,950 1,880 2*230 21...... 3,360 13,100 6,250 4,340 2,510 13,000 13,900 11,600 3,870 1,880 2,720 2,440 22...... 4,240 12,200 7,240 4,010 2,800 14,300 13,400 16,600 2,260 2,280 3,130 2,250 23...... 4,730 10,800 11,900 4,790 1,840 13,000 11,300 18,600 2,980 5,020 2,960 3,700 24...... 5,090 9,860 13,100 8,510 2,590 13,500 11,100 19r,300 2,520 4,600 1,540 4,780 25...... 4,760 9,570 17,400 7,790 3,300 13,700 10,600 19,600 2,430 3,140 1,390 4,980 26...... 5,090 7,800 16,700 7,790 4,690 12,400 10,100 19,000 2,320 3,030 2,330 5,210 27...... 4,960 6,910 15,700 8,010 4,010 12,300 11,100 17,200 2,400 1,910 2,520 4450 28...... 4,280 4,880 13,500 7,000 3,920 26,000 9 560 15,600 2,260 1,520 3,160 3,050 29...... 5,030 6,660 11,400 6,510 21,500 9,150 13,500 2,800 2,360 2,410 2,170 30...... 4,790 6,720 9,600 6,140 18,500 9,500 10,300 4,440 3,280 2,330 3,780 31...... 5,010 8,620 5,900 16,500 9,550 2,810 1,730 1919-20. 1...... 2,860 10,300 12,000 2,610 1,430 1,740 34,500 21,900 4,770 2,290 1,550 1,920 2...... 2,520 12,200 11,100 2,690 1,880 1,800 34,900 19,000 4,080 1,990 2,360 2,040 3...... 2,890 12,300 9,380 3,170 1,800 1,900 35,500 16,700 2,650 1,730 2,920 2,250 4...... 3,070 11,000 7,510 2,980 1,860 2,050 33,400 15,200 2,520 2,480 2,670 2,410 5...... 2,700 16,300 6,63a 2,470 1,970 2,070 34,800 14,200 4, 130 2,680 2,440 1,400 6...... 3,170 14,200 6,180 2,650 2,330 2,280 36,100 11,700 3,180 2,330 1,990 1,240 7...... 4,720 12,000 5,160 2,540 2,470 1,690 32,300 11,200 2,340 1,850 1,630 1,490 8...... 5,420 10,400 6,310 2,510 1,260 2,980 27,100 10,400 3,000 1,890 1,400 1,620 9...... 5,420 9,120 8,470 2,640 2,150 3,650 22,800 10,100 3,250 2,460 1,420 1 790 10...... 5,480 8,700 9,510 3,040 2,490 4,190 19,100 9,610 4,120 2,860 1,790 1,660 11...... 4,580 8,190 8,060 2,440 2,390 4,180 17,100 9,800 3,040 1,380 3,340 1,880 12...... 3,340 8,390 7,300 2,310 2,140 5,510 16,000 11,000 2,450 2,650 3,460 1 420 13...... 5,520 11,400 7^540 2,650 2,010 17,100 21,700 9,530 1,950 3,950 3,750 1,920 14...... 5,480 13,200 9,880 2,540 2,000 15,500 29,900 7,780 2,320 3,050 4,330 2,080 15...... 4,580 12,700 9,150 2,420 1,420 12,100 26,000 6,030 2,850 3,450 3,720 2,640 16...... 3,830 11,600 7,860 2,370 2,080 12,100 25,200 7,190 2,450 3,180 5,570 2,640 17...... 4,800 10,800 6,330 2,050 2,190 20,100 24,700 7,060 3,100 2,540 5,190 2,080 18...... 5,160 9,430 5,980 1,620 2,220 17,700 25,200 7,030 4,530 1,410 4,510 2,230 19...... 3,610 8,510 5,480 1,610 1,890 14,600 23,100 6,030 5,950 2, 230 4,020 1,380 20...... 5,580 7,670 4,610 1,740 2,090 12,000 21, 900 6,120, 4,180 3,870 2,950 1,580 21...... 5,470 7,030 4,070 1,740 2,140 10,000 22,500 6,020 4,970 4,380 2,570 2,160 22...... 5,070 6,360 4,690 1,820 1,230 10,200 25,700 7,700 3,740 4,220 1,600 2,200 23...... 5,900 5,290 5,010 1,580 2,200 12,200 27)600 9,150 3,560 4,140 1,740 2,140 24...... 6,340 6,530 4,890 1,550 2,050 17,100 29,400 9,090 3,440 3,500 2,260 2,070 25...... 6,180 6,850 4,350 1,540 2,100 21,800 28,400 8,250 4,010 1,640 2,140 2,080 26...... 5,020 6,630 4,660 1,820 1,930 26,600 23,800 7.560 3,740 2,120 2,020 1,090 27...... 6,540 11,100 4,860 1,870 2,010 31.700 20,400 8,380 2,590 2,690 2,160 1,480 28...... 7,080 9,080 3,500 1,850 2,000 32,500 23,200 5,520 2,100 2,440 1,840 1,930 29...... 7,630 9,580 3,260 1,900 1,330 33,700 24,700 5,040 2,600 2,260 1,220 2! 150 30...... 7,570 11,600 3,930 1,850 35,900 23,500 5,230 2,930 1,920 2,110 4,100 31...... 7' 960 3,360 1,920 ...... 34,900 5,950 1,630 1,880 192 SURFACE WATER SUPPLY, 1919KL920, PART I. Monthly discharge of Hudson River at Mechanicville, N. Y., for the years ending Sept. 30, 1919 and 1920. [Drainage area, 4,500 square miles.] Discnarge in second-feet. Run-off Month. Per in inches. Maximum. MinimiiTn. Mean. square mile. 1918-19. October...... 9,190 1,520 4,940 1.10 1.27 November...... 14,800 3,520 8,800 1.96 2.19 17,400 3,390 8,160 1.81 2.09 January...... 13,400 3,730 6,510 1.45 1.67 February...... 5,000 1,840 3,430 .762 .79 March...... 26,000 5,820 11,000 2.44 2.81 April...... 31,600 9,150 15,400 3.42 3.82 May 19,600 9,340 13,200 2.93 3.38 5,020*8,480 2,260 4,080 .907 1.01 My...... 1,520 2,680 .596 .69 3,160 1,220 1,970 .438 .50 8,220 1,060 3,710 .824 .92 31,600 1,060 6,990 1.55 21.14 1919-20. October...... 7,960 2,520 5,020 1.12 1.29 November...... 16,300 5,290 9,950 2.21 2.47 December ...... 12,000 3,260 6,480 1.44 1.66 3,170 1,540 2,210 .491 .57 February...... 2,490 1,230 1,970 .438 .47 March...... 35,900 1,690 13,600 3.02 3.48 April...... 36,100 16,000 26,400 5.87 6.55 May...... 21,900 5,040 9,530 2.12 2.44 5,950 1,950 3,350 .744 .83 July...... 4,380 1,380 2,620 .582 .67 5,570 1,220 2,660 .591 .68 4,100 1,090 1,970 .438 .49 The year...... 36,100 1,090 7,140 1.59 21.60 NOTE. The monthly discharge in second-feet per square mile and run-off in inches shown by the table do not represent the natural flow in the basin because of artificial storage. See " Diversions" above. Dur ing January and February, 1920, above record indicates a smaller relative discharge than at other stations in the Hudson River basin. This may be due to the effect of ice. INDIAN LAKE RESERVOIR NEAR INDIAN LAKE, N. Y. LOCATION. At masonry storage dam at outlet o£ Indian Lake, 2 miles south of Indian Lake village, Hamilton County, and 1\ miles above mouth of Indian River. DRAINAGE AREA. 131 square miles, including about 9.3 square miles of water sur face of Indian Lake at the elevation of crest of spillway (measured on topographic maps). RECORDS AVAILABLE. Records of stage and gate openings from July 22, 1900, to September 30, 1920. GAGES. Elevation of water surface in reservoir is determined by chain gage near crest of dam near gate house; prior to November 17, 1911, a staff gage was used at same site. Mean elevation of crest of spillway is at gage height 33.38 feet. Widths of sluice gate openings determined by gage scales at sides of gate stems inside gate house. Gages read by Lester Sevarie. EXTREMES OF STAGE. Maximum elevation of water surface in reservoir for year ending September 30, 1919, 35.0 feet May 3 and 4; minimum elevation 19.8 feet March 5. Maximum elevation of water surface in reservoir, for year ending September 30, 1920, 34.7 feet December 14; minimum elevation, 9.0 feet March 13,17, and 18. 1900-1920: Maximum elevation recorded, 38.8 feet March 28, 1913; minimum stage recorded, 2.0 feet March 9-18, 1907 and January 3-17, 1910. REGULATION. At ordinary stages the flow from Indian Lake is completely regulated by the operation of the sluice gates. Water is held in storage until needed to supplement the flow of the upper Hudson during the low-water period. The storage capacity is about 4.7 billion cubic feet, equivalent to a flow of about 600 second-feet for 90 days. HUDSON EIVEB BASIN. 198 Daily gage height, iri feet, of Indian Lake reservoir near Indian Lake, N. Y., for the years ending Sept. 30, 1919 and 1920. Day. Oct. NOT Dec. Jan. Feb. Mar. Apr. May. June July. Aug. Sept. 1...... 19.95 22.8 27.25 31.1 29.9 20 8 27.1 34.75 33.65 34.1 33.8 27.55 2...... 20.0 23.0 27.35 31.3 29.7 20.6 27.3 34.8 33.65 34.1 33.8 97 9 3...... 20.1 23.2 27.45 31.5 29.5 20.3 27.6 35.0 33.66 34.05 33.8 27.25 4...... 20.2 23.4 27.55 31.6 29.3 20.0 27.8 35.0 33.65 34.05 33.75 97 3 5...... 20.3 23.6 27.6 31.7 29.1 19.8 27.9 34.8 33.65 34,0 33.55 27.35 6...... 20.4 23.8 27.65 31.8 28.85 20.0 28.0 34.6 33.65 33.85 33.45 97 9t 7...... 20.65 24.2 27.7 31.9 28.7 20.2 28.2 34.4 33.65 33.75 33.35 27.05 8...... 20,8 24.« 27.75 31.95 28.45 20.35 28. P5 34.4 33.65 33.6 33.25 26.85 9...... 20.95 24.5 27.8 32.0 27.6 20.5 29.3 34.4 33.7 33.45 33.1 26.8 10...... 21.05 24.75 27.9 32.05 27.3 20.75 30-0 34.4 33.7 33.5 33.0 26.6 11...... 21.1 24.9 27.95 32.1 26.9 20.9 30.8 34.4 33.75 33.55 32.9 26.75 12...... 20.2 25.2 28.0 32.1 26.5 21.0 32.5 34.35 33.75 33.6 32.7 28.8 13...... 20.25 25.3 28.05 32.15 28.15 21.1 33.3 34.35 33.75 33.6 32.45 28.85 14...... 21.3 25.45 28.15 32.2 25.8 21.2 33.8 34.35 33.8 33.6 32.2 23.85 15...... 21.35 25.5 28.3 32.2 25.4 21.3 34.1 34.35 33.9 33.65 31.9 26.85 16...... 21.4 25.6 28.5 32.25 25.1 21.4 34.2 34.15 33.95 33.7 31.7 26.9 17...... 21.45 25.7 28.6 32.25 24.8 21.5 34.3 34.25 34.0. 33.75 31.25 26.9 18...... 21.6 25.8 28.7 32.25 24.55 21.75 34.5 34.6 34.0 33.8 30.95 26.7 19...... 21.55 25.9 28.8 32.25 24.15 22.0 34.66 34.7 34.0 33.8 30.65 26.6 20...... 21.6 26.05 28.9 32.3 23.75 22.3 34.75 34.7 33.95 33.75 30-3 26.5 21...... 21.7 26.2 29.0 32.0 23.35 22.6 34.8 34.7 33.95 33.75 30.0 26.2 22...... 21.8 26.35 29.1 31.7 23.05 23.0 34.8 34.75 33.95 33.85 30.0 26.1 23...... 21.85 26.5 29.3 31.5 22.8 23.45 34.8 34.85 33.95 33.9 29.9 25.95 24...... 22.0 28.6 30.0 31.3 22.45 23.9 34.85 34.95 33.9 33. 95 29.55 26-1 25...... 22.1 26.7 30.3 31.2 22.05 24.2 34.9 3495 33.9 33.9 29.15 26.15 26...... 22.2 28.75 30'.5 31.1 21.7 24.5 34.85 34.75 33.9 33.9 28.9 26.2 27...... 22.3 26.8 30.7 30.95 21.45 24.9 34.8 34.55 34.05 33.95 28.65 28...... 22.4 26.85 30.85 30.7 21.1 25.8 34.75 34.4 34.15 34.0 28.4 26.1 29...... 22.5 26. 95 30.95 30.5 26.2 34.75 34.4 34.15 34.0 28.2 25.85 30...... 22.6 27.1 31-0 30.3 26.6 34.75 34.3 34.2 33.95 28.15 25.7 31...... 22.7 31.05 30.1 28.9 33.7 33.85 27.9 1919-20. 1...... 25.7 29.5 34.1 32.0 20.25 11.85 14.7 29.5 32.3 31.7 30.2 23.2 2...... 25.45 29.8 34.3 31.6 19.9 11.6 15.35 29.3 32.1 31.6 29.95 22.8 3...... 25.4 30.05 34.4 31. i 19.6 11.35 16.8 29.5 32.1 31.7 29.7 22.5 4...... 25.25 30.25 34.45 30.7 19.25 11.1 17.5 29.7 32.1 31.75 29.45 22.6 5...... 25.05 30.4 34. 5 30.3 18.95 10.85 17.9 29.9 32.1 31.8 29.2 22.4 6...... 25.0 30.55 34.5 29.5 18.6 10.65 18.4 30.1 32.15 31.8 29.0 22.0 7...... 25.15 30.65 34.5 29.1 18.25 10.4 18.7 30.3 32.2 31.6 28.75 21.6 8...... 25.3 30.75 34.5 28.7 17.95 10.15 18.9 30.5 32.25 31.35 28.35 21. 2 9...... 25.4 30.85 34.55 28.3 17,65 9.9 19.05 30.8 32.3 31.15 27.9 20.9 10...... 25.55 30.95 34.6 27.9 17.3 9.75 19.2 31.0 32.35 31.0 27.5 20.6 11...... 25.7 31.1 34.65 27.85 17.0 9.5 19.35 31.15 32.35 30.85 27.3 20.4 12...... 25.8 31.25 34.6 27.1 16.7 9.25 19.5 31.25 32.35 30.75 27.3 20.2 13...... 25.9 31.6 34.65 26.7 16.4 9.0 20.25. 31.35 32.25 30.85 27.5 19.95 14...... 26.0 31.95 34.7 26. £ 16.1 9.2 20.9 31.5 32.15 30.95 27.55 19.7 15...... 26.1 32 2 34.65 25.9 15.8 9.2 21.45 31.65 32.0 31.0 27.5 19.6 16...... 26.2 32.45 34.6 25.5 15.5 9.1 22.05 31.75 31.75 31.1 27..4S 19.5 17...... 34 6 25.6 15.2 9.0 22.55 31.95 31.5 31.0 27.25 19.35 18...... 26.6 32.75 34.55 25.2 14.9 9.0 23.0 32.05 31.25 30.75 27.1 19.15 19...... !. . 23.7 32.8 34.55 24.8 14.6 9.4 23.4 32.2 31.4 30.75 27.0 18.8 20...... 26.85 32.85 34.5 24.45 14.35 9.65 23.65 32.35 31.55 30.85 26.9 18.4 21...... 26.95 32,9 34.3 24.1 14.1 9.85 23.8 32.45 31.65 30.9 18. t 22...... 27.25 32.95 34.1 23.8 13.9 10.0 24.5 32.6 31.65 30.95 26.3 17.8 23...... 27.5 33.0 33.9 23.5 13.7 10.15 25.2 32.75 31.7 31.0 25.85 17.4 24...... 27.7 33.05 33.75 23.2 13.45 10.35 25.95 32.85 31.7 31.0 25.6 17.2 25...... 27.9 33.1 33.6 22.85 13.2 10-65 26.5 32.95 31.7 31.0 25.3 17.05 26...... 28.05 33.2 33.45 22.45 12.95 11.1 26.85 33.5 31.7 31.0 25.05 16.7 27...... 28.25 33.35 33.3 22.1 12.7 11.7 27.2 32.8 31.7 31.0 24.75 16.35 28...... 28.5 33.5 33.15 21.75 12.35 12.4 27.7 32.65 31.75 30.95 24.45 16.15 29...... 28.8 33.6 33.0 21.45 12.05 13.1 28.2 32.7 31.75 30.8 24.1 16.05 30...... 29.0 33.75 32.8 21.05 13.65 28.7 32.75 31.8 30.7 23.7 16.0 31...... 90 91; 32.4 20.65 14 2 32.55 30.55 23.5 102721 23 WSP 501 13 194 SURFACE WATER SUPPLY, 190.9-1920, PART I. Gate openings, in inches, at Indian Lake reservoir near Indian Lake, N. Y., for the years ending Sept. 30, 1919 arid 1920. From T<) ' Sluice Sluice gate A. gate B. Date. Hour. Date. Hour. 1918-19. Oct. 1...... Jan. 20 Oct. 1 ...... Feb. 6 Jan. 20 ...... Mar. 5 2 p. m. 54 Feb. 6...... Mar. 5 60 Apr. 15...... Apr. 17 7 p. m. 60 Apr. 18 ...... Apr. 18 7 p. m. 60 May 6...... :...... May 7 May 31 ...... 1 p. m. 60 July 5 Mar. 5...... Aug. 12 July 5...... July 11 30 Aug. 4...... Aug. 26 if) Aug. 12...... Aug. 16 30 Aug. 16...... Aug. 21 - Aug. 23.'...... Aug. 29 11 a. m. 54 Aug. 30 on Aug. 31...... Sept. 3 . 30 Sept. 6...... Krf Sept. 17 ...... Sept. 23 60 Sept. M...... Sept. 23 °.f> Sept. 27...... 60 1919-20. Oct. 1...... Oct. 6 60 Oct. 1...... 10 a. m. Oct. 2 30 Oct. 4...... 30 Dec. 20...... Mar. 18 60 Dec. 29 ...... w Dec. 30...... Mar. 18 54 Apr. 19...... Apr. 21 Apr. 20...... Apr. 21 60 May 27...... 9a.m. 54 May 28...... May 28 54 May 31...... May 31 54 30. June 15. 1 ...... June 30...... July 2 60 July 6...... July 12 54 July 17...... Ttiiv IQ 11 a. in. KA July 27...... 8 p. m. ;*ttg:''-l 4 p, HI. 80 July 31...... 3 p. m. ci Aug. 7...... Alter 11 60 Aug. 14...... 1p.m. 60 Aug. 21 ...... *ui Alter 9S i Oft Aug. 28...... RA Sept. 5...... Sept. 30 60 Sept. 5...... Se.pt. 11...... Sept. 14 54 Sept. 18...... 54 Sept. 25...... Sept. 28 NOTE. In 1919 the main logway was open 15 feet during the following periods: May 5,5 a. m. to 4 p. m.; May 16, 5 a. m. to 3 p. m.; May 29, 5 a. m. to 6 p. m.; May 27,1 p. m. to 6 p. m.; May 28, 6 a. m. to 5 p. m. It was also open 7J feet from 1 p. m. May 31 to 1 p. m. June 1. In 1920 the main logway was open 15 feet during the following periods: May 27, 8 a. m. to 7 p. m.; May 28, 7 a. m. to 1 p.'M.; May 31, 8 a. m. to 1 p. m. June 1, 7 a. m. to 5 p. m.; June 2, 7 a. m. to 5 p. m. HUDSON RIVER BASIN. INDIAN RIVER NEAR INDIAN LAKE, N. Y. LOCATION. Three-fourths mile below dam at outlet of Indian Lake, 2 miles south of Indian Lake village, Hamilton County, 1 mile above mouth of TSg Brook, and!" 6$ miles above mouth of Indian River. DRAINAGE AREA. 132 square miles (measured on topographic maps). RECORDS AVAILABLE. July 1, 1912, to June 30, 1914; June 5, 1915, to September 30r 1920; also miscellaneous measurements in 1911. GAGE. Gurley 7-day graph water-stage recorder; installer! August 30, .1916, on right bank three-fourths mile below dam, at same datum as staff gage previously used. Recorder inspected by Lester Sevarie. DISCHARGE MEASUREMENTS. Made from cable about 75 feet below gage or by wading. CHANNEL AND CONTROL. Control is a reef of coarse gravel; permanent. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder, for year end ing September 30, 1919, 5.88 feet at 9 a. m. May 5 (discharge, 2,060 second-feet)^ minimum stage, from water-stage recorder, 0.04 foot at 5 a. m. October 2 (discharge,. 1.3 second-feet). Maximum stage from water-stage recorder, for year ending September 30r 1920, 4.92 feet at 4 p. m. May 27 (discharge, 1,500 second-feet); minimum stage from water-stage recorder, 0.07 foot during most of June 24, 25, 29, and 30 (dis charge, 1.6 second-feet). 1912-1920: Maximum stage recorded, 7.8 feet at 4 p. m. March 28, 1913 (dis charge, 3,460 second-feet); minimum stage from water-stage recorder, 0.04 foot October 2, 1918 (discharge, 1.3 second-feet).11 ICE. Stage-discharge relation not affected by ice. REGULATION. Discharge is regulated by operation of sluice gates at Indian Lake dam*- ACCURACY. Stage-discharge relation permanent. Rating curve well defined be tween 15 and 1,500 second-feet. Operation of water-stage recorder satisfactory except for periods indicated in footnote to daily-discharge table. Daily dis charge ascertained by applying to rating table mean daily gage height determined by inspection of the recorder graph, or for days when there have been changes in openings of sluice gates at Indian Lake dam, by averaging the discharge for bi-hourly intervals of the day. Records good except for periods for which recorder did not operate satisfactorily. Discharge measurements of Indian River near Indian Lake, N. Y., during t\e years end ing Sept. 30, 1919 and 1920. Dis Gage Dis Date. Made by height. charge. Date. Made by- height. charge.. 1918. Feet. Scc.-ft. 1919. Feet. 8ee.-ft. Nov. 14 0.25 5.22 0,54 19.4. 1919. Oct. 24 .25 7.97 Feb. 11 .....do...... 3.56 838 From rating table revised since 1918. 196 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Indian River near Indian Lake, N. Y., for the years ending Sept. 80, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June July. Aug. Sept. 1918-19. 1...... 1.5 5.2 12 51 584 .725 12 418 838 124 90 788 2...... 1.4 4.6 11 54 584 704 13 471 207 118 89 702 3...... 1.8 4.3 11 54 564 704 14 526 128 109 86 210 4...... 1.9 4.2 -12 60 564 684 16 545 59 103 142 4.5 5...... 1.7 4.0 19 59 564 396 18 1»310 62 164 420 2 7 6...... 3.7 4.0 13 60 716 6.8 21 703 63 359 322 208 7...... 3.7 3.9 15 60 875 3.9 23 890 66 341 316 508 2.4 3.9 15 62 875 3.4 24 436 67 328 313 489 1.9 3.9 15 62 853 3.0 29 436 69 313 307 EAQ 10...... -...-- 1.7 4.2 15 62 853 3.9 37 418 67 310 307 330 11...... 1.5 4.4 16 66 832 3.2 57 418 67 221 304 1 0 12...... 1.7 4.4 16 66 S32 2.4 76 436 66 57 445 2 7 11 1.6 4.4 16 66 832 2.6 82 436 66 56 643 2 n 14...... 1.6 5.2 17 65 810 2.6 103 436 79 53 643 1 Q 15...... 1.6 5.5 20 65 810 2.2 175 418 92 61 643 1.8 16...... 1.5 5.2 20 66 788 2.2 584 831 92 73 684 1.7 17...... 1.6 5.2 20 67 788 2.0 594 453 100 77 832 72 18...... 1.5 6.5 20 70 767 3.9 433 584 98 80 832 353 1Q 1.6 8.6 20 70 767 5.2 388 643 97 84 832 353 20...... 1.5 7.5 22 158 767 6.5 436 664 94 83 832 442 21...... 1.9 7.9 22 603 767 9.5 453 643 90 86 692 664 22...... 1.9 9.0 24 603 767 9.0 471 623 79 95 284 664 23 ...... 1.9 10 29 603 746 5.8 471 643 77 95 363 462 24...... 1.9 10 32 603 746 5.5 489 684 74 92 810 4.2 25...... 2.0 10 36 623 725 4.4 489 704 79 84 810 3 7 26...... 2.8 9.9 42 603 725 4.2 489 1,280 76 83 664 3.2 27...... 3.0 9.0 48 603 725 5.2 453 796 108 90 526 127 oo 3.0 9.0 51 603 725 13 436 651 127 100 508 353 OQ 2 0 12 51 603 14 415 436 131 100 404 347 30...... 3.9 13 49 584 11 405 402 129 95 320 14.1 Q1 9.0 49 584 11 820 95 658 1919-20. 1...... 338 7.5 66 941 704 453 5.0 570 344 784 767 2...... 334 6.8 89 941 704 453 5.0 540 206 526 746 3...... 328 7.2 101 941 684 436 4.7 46 5.0 526 193 4...... 322 7.6- 115 941, 684 436 3.7 7.9 3.9 526 0 Q 5...... 316 9.t) 125 919 684 418 5.7 7.9 3.5 526 482 6...... 200 9.5 133 919 664 418 4.4 10 7.5 227 526 725 7...... 10 142 897 664 415 2.9 7.2 545 680 725 8...... 11 148 897 643 408 3.1 6.8 545 853 7fl4 11 152 897 643 402 3,7 6.8 545 853 704 10...... 11 185 875 623 392 3.0 6.2 408 853 408 11...... 10 191 875 603 388 5.0 341 729 576 19 11 198 853 603 388 11 98 154 253 fifti iq 12 212 853 584 385 12 392 3.5"3.7 3.9 684 14...... 12 260 832 584 385 5.0 12 395 136 428 15:...... -...... 7.0 13 286 810 564 385 16 436 3.3 325 259 16...... 14 286 8ld 564 385 16 526 3.1 325 256 17...... 14 270 810 545 385 4.4 17 526 220 322 256 18...... 13 259 810 545 290 3.5 17 350 545 322 520 19 i. 13 242 810 526 165 18 4.0 292 319 664 20...... 12 311 788 526 560 18 2.9 4.4 319 643 21...... 13 603 788 526 650 17 2.5 3.7 612 643 22 ...... 13 545 767 526 15 2.3 3.5 832 fioo 23...... 13 508 767 508 16 1.8 3.3 765 623 24...... 5.2 12 471 746 489 16 1.7 3.5 603 OIA 25...... 5.2 12 453 746 489 7.0 16 1.7 3.3 603 dft! 7.0 26...... 6.8 11 418 746 471 16 1.7 3.1 603 603 27...... 7.2 12 418 725 471 738 1.7 23 584 584 28...... 7.2 13 418 725 453 181'530 1.7 350 620 jeo on 6.5 1Q 472 725 453 1.7 OCQ 767 OAT 30 6.2 44 815 725 176 36 363 767 1QA 31...... 8.3 941 725 558 533 767 NOTE. Discharge for following periods for which water-stage recorder did not operate satisfactorily, estimated from records of gate openings and elevation of water in Indian Lake reservoir: Nov. 2-7, 1918, Oct. 7-23, 1919, Mar. 18-31, 1920, Apr. 1,2,11-16,19-30,1920, May 1-11,1920. Braced figures show mean Monthly discharge of Indian River near Indian Lake, N, T.,for the years ending Sept. SO, 1919 and 1920. [Drainage area, 132 square miles.] Discharge in second-feet. r Run-off Month. Per . in inches. Maximum. 'Minimum. Mean. square mile. 1918-19. October ...... 9.0 1.4 2.31 0.018 0.02 November...... 13,0 3.9 6.63 .050 .06 51 11 24.2 .183 .21 January ...... 623 51 257 1.95 2.2$ February...... 875 564 748 5.«7 5:I March...... 725 2.0 108 .818 April...... 594 12 257 1.96 2.18 May...... 1.310 402 618 4.68 5.40 838 '5399 115 .871 .97 July...... 359 133 1.01 1.16 832 86 . 488 3.70 4.27 September...... 788 1.7 265 2.01 2.24 The year...... 1,310 1.4 249 1.89 25.60 1919-20. 338 64.6 .489 .56 44 6.8 12.5 .095 .11 December ...... 941 66 317 2.40 2.7T 941 725 827 6.26 7.22 February...... 704 453 577 4.37 4.71 453 . 236 1.79 2.0ft 650 50.6 .383 .43 M«ir 738 81.5 .617 .71 570 1.7 133 1.01 1.13 July...... 545 3.1 195 1.48 1.71 August...... 853 3.9 556 4.21 4.85 767 2.9 503 3.81 4.25 941 1.7 296 2.24 30.51 NOTE. The monthly discharge in second-feet per square mile and run-off in inches shown by the table do not represent the natural flow from the basin because of artificial storage in Indian Lake reservoir. 198 SURFACE WATER SUPPLY, 1919-1920, PART I. SCHROON RIVER AT RITTERBANK, S. Y. I/OCATION. At steel highway bridge near Riverbank post office, Warren County, near Tumblehead Falls, 9 miles below Schroon Lake, and 9 miles above Warrensburg. DRAINAGE ABE A. 534 square miles. RECORDS AVAILABLE. September 2, 1907, to September 30, 1920. GAGE. Chain, on upstream side of bridge; read by J. H. Roberts. DISCHARGE MEASUREMENTS, Made from upstream side of bridge. CHANNEL AND CONTROL. Gravel; occasionally shifting. Logs become lodged on the control at times nearly every year. EXTREMES OP DISCHARGE. Maximum stage recorded for year ending September 30, 1919,, 6.7 feet at 8 a. m. and 4 p. m. April 13 (discharge, 4,800 second-feet, prob ably greater during middle of day); minimum stage recorded, 1.40 feet at 4 p. m. August 12 (discharge, 145 second-feet). Maximum stage recorded for year ending September 30, 1920, 6.25 feet at 8 a. m. and 4 p. m. April 16 (discharge, 4,240 second-feet); minimum stage re corded (stage-discharge relation affected by logs), 1.55 feet at 5 p. m. August 8 and 8 a. m. August 11 (discharge, 145 second-feet). Minimum daily discharge, 100 second-feet January 26. 1907-1920: Maximum stage recorded, 10.7 feet at 5 p. m. March 28, 1913 (dis charge, about 13,500 second-feet); minimum stage recorded, 0.85 foot at 5 p. m. October 17, 1909 (discharge, 28 second-feet). ICE. Stage-discharge relation affected by ice. REGULATION. Flow affected by storage in Schroon and Brant lakes. ACCURACY. Stage-discharge relation probably permanent during year except as affected by ice January 9 to 14, 1919, and December 15, 1919, to March 23, 1920, and by logs on the control March 26 to June 30, 1919, and May 21, 1920, to Sep tember 30, 1920. Rating curve fairly well defined between 150 and 4,000 second- feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Records good except those for periods when stage-discharge relation was affected by ice or logs, for which they are fair. Discharge measurements of Schroon River at Riverbank, N. Y., during the years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Jan. 11 a 3.29 79Q Jan. 27 a 2.55 302 JTeb 14 .....do...... 425 Feb. 22 a 2.41 229 May 10 O. W. Hartwell...... ft Q Ot> 1,330 .....do...... 302 6 2.52 524 May 10 .....do...... 3.82 1.480 Aug. 15 .....do...... 1.62 t>1O July 28 C.C. Covert...... 6 2.57 491 Aug. 19 Howe and Currier...... b 1.68 217 1920. Sept. 26 Shupe and Currier.. . . . 6 1.74 228 Jan. 4 Howe and Davison. .... o 2.50 363 0 Stage-discharge relation affected by ice. h Backwater from logs. HUDSON RIVER BASHST. 199 Daily discharge, in second~feet, ofSchroon River at Riverbank, N. Y.,for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... :.... 388 1,460 1,290 800 610 407 3,200 1,100 1,100 690 316 186 2...... 333 1,550 990 860 585 427 3,000 1,100 1,100 585 281 186 3...... 388 1,550 990 860 560 427 2,600 1,200 1,000 351 264 186 4...... 351 1,640 990 860 535 447 2,400 1,100 1,100 201 232 186 5...... 407 1,550 920 860 535 490 2,200 1,300 1,100 248 216 316 6...... 490 1,460 920 920 535 468 2,200 1,200 850 232 232 351 7...... 690 1,370 800 920 512 512 2,400 1,200 650 264 216 298 8...... 1,060 1,290 800 745 490 512 2,600 1,400 750 232 216 369 1,130 1.130 772 750 4QO 635 2,800 1,400 700 216 201 407 10...... 1,060 1,060 772 750 468 690 2,800 1,400 650 264 201 407 n.'...... 990 1,130 718 750 447 662 3,000 1,600 1,000 316 172 407 12...... 920 920 745 700 447 662 4,000 1,500 750 298 145 ,407 13...... 1,210 920 800 700 447 718 4,800 1,500 900 298 186 407 14...... 1,290 860 ftftrt 700 427 662 4,600 1,500 500 298 186 388 ts...... 800 800 800 718 427 662 3,800 1,600 500 316 201 388 16...... 369 800 860 800 407 662 3,800 1,400 420 333 172 407 17...... 447 800 860 718 407 690 3,600 1,400 500 333 169 .388 18...... 468 QAO QfiA 690 407 745 3,400 1,400 500 351 186 369 19...... 468 1,210 860 662 407 860 3,200 1,500 360 333 186 351 20...... 447 1,550 SOA CQA OQQ 1,130 3,000 1,600 500 316 172 351 21...... 512 1,550 772 718 369 1,290 2,800 1,500 400 298 172 351 22...... 535 1 ft4fl 779 635 369 1,640 2,400 1,700 380 298 172 351 23...... 585 1.640 635 610 351 1,940 2,400 2,800 380 333 172 351 24...... 585 1,550 690 690 369 2 040 2,200 3,200 380 351 186 351 25...... 490 1,550 800 745 351 2' 150 2,000 3,400 420 369 172 351 26...... 585 1,370 QOA 690 333 2,000 1,800 3,400 460 333 172 351 27...... 535 1,290 920 690 333 2,000 1,600 2,600 500 351 172 407 28:...... ,..... 585 1,130 920 690 OKI 2,200 1,600 2,400 320 407 186 388 29...... 610 1,210 920 690, 3 AAA 1 400 1 900 Qftfl 407 172 OCQ 30...... 635 1,310 920 662 3,600 1 dnn 1,700 Wl 333 172 351 31...... 920 800 635 3,600 1,«00 333 172 1919-20. 1...... 388 585 800 280 170 170 3 340 3,210 635 158 201 2...... 369 585 860 280 200 140 3,470 2,840 585 \AK 172 201 QAA 3...... 351 635 860 200 3,470 2,720 wm 1 R& 186 4...... 388 610 779 340 200 170 3,600 2,480 490 1*Lft 172 186 5...... 407 Ron 745 q9f| 170 170 3,740 2 °. 7ft 490 1 KQ 186 6...... 497 690 772 300 OAA 170 4,020 2 QflA 560 i*ft 158 IQft 7...... 635 745 240 99ft 300 4,020 2 480 Kftn 186 172 186 8...... 407 Ron 240 200 q/v\ S oon 1 940 560 141 186 9...... 407 585 71ft 94fl 99ft onrt 3,340 i £i»fi 490 IQft tAK 10ft to...... 4fl7 610 690 300 99A qftft 2 Qftft 1,370 4ft7 216 158 IQft 11...... 388 635 ftA9 280 nl TOrt 1,370 OQQ Ofll IAK IQft 12...... 388 718 772 170 94ft 280 2 4£ft 1 9QA 369 9QQ 145 9ft1 13...... 407 920 772 9on 220 300 2 QflA 351 316 1 t& 316 14...... 388 1,060 fton 200 240 220 3,740 1,130 369 333 172 333 15...... 497 1,060 flCA 180 240 4,170 1,210 745 497 QOO 16...... 447 QQft 550 160 340 4,170 1,060 9fl1 RIO 316 17...... 468 OQA CAA ion 220 340 4,170 1,060 662 316 535 316 18...... 468 1,060 500 190 99H 220 3 88ft 1 ftftfk 662 316 316 298 19...... 447 990 600 260 340 3,740 1,210 610 351 201 Ofid 20...... 447 920 700 280 180 360 3,210 non 333 OKI 201 264 21...... 497 920 460 99ft OAA 320 3,340 960 610 468 9fi4 22...... 427 OAA 480 240 99ft OQA 3 fiAA 1,020 497 201 94ft 23...... 497 745 ecn 220 9OA OQA 3,740 *71ft 427 216 94ft 24...... 447 772 400 260 9ftn RftA 4,020 1,170 71ft 369 201 909 QQA QRI 25...... 468 320 160 Oftft 745 3 1,170 fUW 201 232 26...... 468 745 320 100 1 Aftft 3 RAA 1,100 610 407 1QC 216 coe 1 CO OK-I 27...... fton 280 QAA 1 ^A I ecA 3 91ft 1,020 Iflfi 216 28...... 4OH AA9 9ftft 260 170 1,840 3 91 A Qftft 172 OKI 201 909 29...... 512 635 Ofifl 9ftft im 2 Ann 3 9.4ft 1,170 90.1 OQQ 186 232 30...... 512 690 320 99ft 3,080 3 0JA 71ft Ofil 186 232 31...... 512 400 220 3,340 662 158 201 NOTE. Discharge, Jan. 9 to 14, 1919, Dec. 15, 1919, to Mar. 23, 1920, determined from gage heights cor rected for ice effect by means of discharge measurements, and study of gage-height graph and weather records. Discharge, Mar. 26 to June 30,1919, and May 21 to Sept. 30,1920, determined by shiftfng-control method because of backwater from logs. 260 SURFACE WATER SUPPLY, 191&-1920, PART I. Monthly discharge of Schroon River at Riverbank, N. Y., for the gears ending Sept, SO, 1919 and 1920. [Drainage area, 534 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 1,290 333 654 1.22 1.41 1,640 800 1,270 2.38 2.66 1.290 635 S54 1.60 1.85 920 610 739 1.38 1.59 610 333 441 .826 .86 3,600 407 1,220 2.28 2.63 April...... 4,800 1,400 2,770 5.19 5.79 Mav 3,400 1,100 1,730 3.24 3.74 1.100 320 635 1.19 1.83 July...... 690 201 332 .622 .72 316 145 196 .367 .42 407 186 346 .648 .72 4,800 145 932 1.75 23.72 1919-20. 535 351 437 .818 .94 1,060 585 767 1.44 1.61 December ...... 860 260 584 1.09 1.26 340 100 238 .446 ,51 260 150 207 .388 .42 March...... 3,340 140 676 1.27 1.46 April...... 4,170 2,480 3,540 6.64 7.41 Mav 3,210 662 1,510 2.83 3.26 745 158 510 .956 1.06 July...... 46S 145 .285 .534 «P 535 145 214 .401 .46 333 186 238, .446 .50 4,170 100 766 1.43 19.51 NOTE. The monthly discharge in second-feet per square mile and the run-off to inches shown by the table do not represent the natural flow from the basin because of artificial storage in Schroon and Brant lakes. HUDSON EIVEE BASIN. SACANDAGA RIVER HEAR HOPE, N. Y. LOCATION. About 1J miles below junction of East and West branches, 3£ miles above- Hope post office, Hamilton County, and 12 miles above Northville. DRAINAGE AREA. 494 square miles (measured on topographic maps). RECORDS AVAILABLE. September 15, 1911, to September 30, 1920. GAGE. Staff in two sections on left bank, the lower inclined, the upper vertical;, about one-half mile above inflow of Colombe Brook; read by Melvin Willis. DISCHARGE MEASUREMENTS. Made from cable 100 feet below gage or by wading. CHANNEL AND CONTROL. Rocky; probably permanent. EXTREMES OF DISCHARGE. Maximum stage recprded for year ending September 30, 1919, 7.00 feet at 7.15 a. m. April 12 (discharge, 9,540 second-feet); minimiTm stage recorded, 1.50 feet at 6.30 p. m. October 13, and 7 a. m. October 14 (die- charge, about 70 second-feet). Maximum stage recorded for year ending September 30, 1920, 6.10 feet at 7 a. m. April 22 (discharge, 6,640 second-feet); minimum stage recorded, 1.50 feet at 7 a. m. September 30 (discharge, about 70 second-feet). 1911-1920: Maximum of stage recorded, 11.7 feet during the flood of March 25-30, 1913, determined by leveling from flood marks (discharge above limits of rating curve); minimum stage recorded, 1,17 feet at 7.55 a. m. September 30, 1913 (discharge, about 16 second-feet). ICE. Stage-discharge relation affected by ice. ACCURACY. Stage-discharge relation permanent; affected by ice December 13, 1919,. to March 19, 1920. Rating curve well defined between 60 and 10,000 second-feet. Gage read to hundredths twice" daily. Daily discharge ascertained by applying mean daily gage height to rating table. Records good except those for periods when the stage-discharge relation was affected by ice, which are fair. Discharge measurements of Saeandaga River near Hope, N. Y., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis- Date. Made by height. charge. Date. Hade by height. charge. 1918. Feet. Sec.-/*. 1919. Feet. Sec.-ft. Oct. 24 *> fift 663 Aug. 13 i.87 1R» 1919. 1920. 2.12 272 Aug. 17 .....do...... 2.45 498 202 SURFACE WATER SUPPLY, 19W-1920, PAR4! I. Daily discharge, in second-feet, ofSacandaga River near Hope, N. Y.,for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 421' 1...... 1 740 1,060 eon 1 060 4 OOA 1,560 865 190 660 2...... 590 1,110 525 1 440 4,230 3,130 660 178 380 660 3...... ftOC 1,680 438 4,230 2,930 558 175 340 1,010 4...... 625 i iftfl 432 1,220 4 480 2,740 454 161 320 740 5...... 590 1 330 1,220 4 QQA 2 C£tft 385 154 qftl CQft 6...... 465 1,110 1,810 S OKft 2,560 4fiS 310 320 525 7...... 438 1,010 400 1 11...... 1,330 1,220 1,330 Oftft 150 800 3,330 1,280 273 230 260 12...... 1,220 1,680 1,220 1PU1 800 2 non 1,220 247 230 590 247 13...... 1,160 1,110 1,100 Oytft IBA 1,000 2 CAA 1,160 238 350 820 238 14...... 1,110 1,010 1,100 260 160 1 400 4 990 1,160 O1 0 320 820 225 15...... 910 OKA 220 left 1,800 4*990 1,110 198 287 660 242 16...... 1,280 1 940 850 Oftft 1 Cft 2 Oftft 5,520 172 269 590 OOft 17...... 1,560 1,680 800 200 1 en 2 Oftft 4,990 1,110 01 q 247 438 217 18...... 1 °.°.ft 1,680 Oftft 190 1 AftA 4 480 1,060 370 225 340 ion 19...... 1,220 7Bft i en 180 1,380 4^230 1,010 320 421 310 178 20 1,220 I qoA 7^ ISA 190 1 440 3 QQA 960 292 4QC 973 168 21...... 1 ooft 1,160 7>%n 180 ion 1 440 4 7qft 1,110 269 421 238 154 22...... 1 Kfift 1,110 700 170 OAft I qoft 6,640 1 440 255 07/\ 205 23...... 1,810 1,060 ftCft i "in 190 2 oqn 5,250 1^280 230 320 194 111 24...... 1,680 1,110 140 Oftft 2 560 4 730 1,110 217 273 Ifift 106 25...... 1,680 1,110 500 ion 220 3 1 Oft S QQft OAft 205 247 154 101 : 26...... I CQft 1 Oflft 460 140 240 3 7fift 820 ion 238 1 en NOTE. Daily discharge Dec. 13,1919 to Mar. 19,1920, estimated from gage heights corrected for ice effect and by comparison with Hadley station on basis of drainage areas. Daily gage heights Oct. 1 to Nov. 16, 1918, believed to be inaccurate; discharge estimated by comparison with records at other stations. Braced figures show, mean discharge for periods included. HUDSON RIVES BASIN". 203 Monthly discharge of Sacandaga River near Hope, N. Y.,for the years ending Sept, SO, 1919 and 1920. [Drainage area, 494 square miles.] Discharge in. second-feet. , Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. o600 1.21 1.40 November ...... 1,190 141 2.69 3,990 380 1,140 2.31 2.66 1,680 625 936 1.89 2.18 February...... 590 335 424 ,860 .90 March...... 5,790 1,060 2,940 5.95 6.86 April...... 8,830 1,220 3,380 6.84 . 7.63 May...... 3.130 1,010 2,190 4.43 5.11 865 141 317 .642 .72 July...... 1.440 154 504 1.02 1.18 625 147 342 .692 .80 Sept ember ...... 1,010 292 578 1.17 1.30 The year ...... 8,830 141 1,220 2.47 33.43 1919-20. 2,560 460 1,340 2.71 3.12 2,930 910 1,490 3.02 3.37 2,230 340 942 1.91 2.20 260 120 190 .385 ,44 240 150 172 .348 .38 5,250 190 1,910 3.87 4.46 April...... 6,640 2,560 4,560 9.23 10.30 May...... 2,560 495 1,230 2.49 2.87 465 135 283 .573 .64 July...... 495 141 275 .557 .64 820 119 279 .565 .65 260 75 150 .304 .34 ' 6,640 1,070 2.17 29.41 Estimated. SACANDAGA RIVER AT HAD LEY, K. Y. LOCATION. Half a mile west of railroad station at Hadley, Saratoga County, 1 mile above mouth of river, and 4£ miles below site of proposed storage dam at Conkling- ville. DRAINAGE AREA. 1,060 square miles (measured on topographic maps). KECORDS AVAILABLE. January-1, 1911, to September 30,1920. September 13,^1907, to December 31,1910, at upper bridge station; September 24,1909, to midsummer of 1911, at lower bridge station. GAGE. Gurley 7-day recorder in a concrete shelter on the left bank. Recorder in spected by J. F. Kelly. DISCHARGE MEASUREMENTS. Made from highway bridge half a mile below gage or by wading. CHANNEL AND CONTROL. Very rough but permanent. EXTREMES OP DISCHARGE. Maximum stage from water-stage recorder for year end ing September 30, 1919, 8.3 feet at 5 p. m. April 13 (discharge, 11,900 second- feet) ; minimum stage from water-stage recorder 2.78 feet at 6 a. m. August 18 (dis charge, 254 second-feet). Maximum stage from water-stage recorder, for year ending September 30, 1920, 8.67 feetat 3.30 p. m. March 30 (discharge, 13,300 second-feet); minimum stage from water-stage recorder, 2.70 feet, midnight to 4 a. m. September 28 (discharge, 218 second-feet). 1911-1920: Maximum stage from water-stage recorder, 12.36 feet from 11 a. m. to noon March 28, 1913 (discharge, about 35,500 second-feet); minimum stage from water-stage recorder, 2.25 feet all day September 16, 1913 (discharge, about 61 second-feet). 204 SURFACE WATER SUPPLY, 1919-1920, PART I. ICE. Stage-discharge relation affected by ice. ACCURACY. Stage-discharge relation permanent; affected by ice during a large part of period from December 12,1919, to March 16,1920. Eating curve well defined between 150 and 20,000 second-feet. Operation of water-stage recorder satisfac tory throughout both years except for a few days. Daily discharge ascertained by applying to the rating table mean daily gage height determined by inspecting gage-height graph, or for days of considerable fluctuation, by averaging discharge for intervals of the day. Open-water records good; records for period of ice effect fair. Discharge ^measurements of Sacandaga River at Hadley, N. Y., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Jan. 16 4 OQ 1,270 «5.83 46& Feb. 18 .....do...... 03.50 334 May 10 .....do...... 4.96 2,570 « Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Sacandaga River at Hadley, N. T.,for the years ending Sept. SO, 1919 and 19W.- Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1 660 5,210 1,800 2,780 1, ISO 865 6,980 2, £20 1,800 910 928 976 2...... l',340 5,600 1,290 2,960 1,060 1,170 5,860 3,990 1,520 770 804 966 3...... 5,080 1,270 3,560 966 1,520 4,950 5,080 1,270 660 652 1,060 4...... 1,090 4,340 1,390 3,460 910 1,780 4,340 5,470 1,090 573 539 1,380 5...... oni 3,660 1,390 2,690 864 1,950 4,220 5,340. 956 606 455 1,290 6...... 1,040 3,150 1,240 2,110 847 2,350 4,460 5,210 838 480 418. 1,060 7...... 1,600 2,«60 1,010 1,850 787 2,780 4,820 4,950 778 532 418 778 8...... 1,.710 2,270 1,040 1,«80 745 2,870 6,608 4,320 738 706 430 580 ^...... 1,540 1,880 1,170 1,900 698 3,060 6,270 4,700 778 622 461 539 10...... 1,310 1,720 1,350 1,720 722 3,990 6,980 4,220 873 652 474 864 11...... 1,1» : 1,650 1.240 1,450 869 1 4,220 7,740 4, 100 ; 882 1,220 378 1.240 12...'...... 996 1,529 1,060 1,356, 801 4,340 9,370 4,460 821 2,270 338 1,120 13...... 882 1 17ft 1,080 1,250 683 4,460 11,500 4,820 730 1.650 307 1,060 14...... 821 1,310 1,100 1,260 594 3,770 11,100 4,700 660 1,160 292 «10 15...... 778 I 220 1,390 l'-250 630 3,350 9,030 4,340 630 910 .288 746 16...... 736 i,150 2,350, 1,270 714 i 2,960 7,430 3,770 019 847 278 637 17...... 6» 1,090,, 2,780 1,280 939 .,2*430 6,70ft 1,070 1,100 273 687 18...... 683 1,630 2,600 1,090 910 2,780 6,270 s'sS) 1,HO 986 263 545 19...... 714 J 3,660 2,190 1,040 917 3,770 5,860 4^100 .947 787 331 480 20...... 675 4,100 1,770 1,040 824 4,580 6,210 3,990 746 668 716 424 21...... l.OK, 3,990 1,560 956 690 5,470 4,580 3,660 622 594 1,140 412 22...... 1,880 3,560 1,520 938 580 6, 160 3,990 4,22Qi 526 688 812 495 23...... 1,880 3,060 2,640 910 566 6,840 3,460 5,600 4fi7 L250 652 668 34...... 1,700 2,«00 8,770 1,430 652 «,980 3, ISO 6,270 401 1,220 683 1,240 25...... 1,440 2,110 4,460 l,95fl 587 6,080 B,25fl 6,700 366 1,060 676 1,170 36...... 1.270 1,740 6,840 .2,270 552 6,700 3,250 6,550 339 888' 864 1,120 27...... 1,430 1,260 7,130 2,110 601 6,410 3,060 5,860 339 864 778- 1,020 28...... 1,580 1.270 6,140 1,880 652 8,050 2,690 5/080 1,460 1,276 «98 882 29...... 1,490 1,530 4,950 1,650 £,370 2, 00 4,220 1,729 1,680 i362 762 30...... 1,490 1,760 3,880 1,490 8,050 2,600 3,250 1,160 1,340 60S 668 R.350 8.086 1.840 7.740 2.520 I'flBO 660 HUDSON RIVER BASIJT. 205 Daily discharge, in second-feet, ofSaccmdaga River at Hadley, tf.'Y.',for the years ending Sept. 30, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 191&-20. 1...... 587 3,150 3,770 340 280 360 11,500 7,280 882 395 552 323 2...... 532 3.660 3,770 320 400 400 12,200 6,410 804 387 683 361 3...... 559 3,770 3,150 340 420 380 12,600 5,470 730 913 645 355 4...... 980 3,660 2,270 400 400 360 11,900 4,700 660 956 545 328 £...... 675 3,660 1,770 460 420 400 11,500 4,100 630 882 474 297 6...... 722 3,770 1,620 340 460 800 11,100 3,560 690 738 418 278 7...... 1.740 3,660 1,520 360 420 1,200 10,400 3,060 804 608 378 273 8...... 2.030 3,350 1,650 460 420 1,400 9,030 2,690 830 573 355 297 9...... 1.640 2,780 1,740 400 400 1,400 7,280 2,520 762 637 328 302 10...... 1,480 2,430 2,110 400 400 1,300 6, 140 2,600 682 722 323 307 11...... 1,770 2,110 2,350 360 360 1,300 5,470 2,780 615 608 361 323 12...... 1,800 2,190 1,800 340 360 1,300 4,820 3,060 552 519 1.030 361 13...... 1.560 3,000 1,500 340 360 1,500 5,860 2,960 499 832 1,740 443 14...... 1,380 3,990 1,400 340 340 2,000 7,740 2,690 474 1,100 1,550 587 15...... 1,200 4,220 1,200 340 320 2,700 8,700 2,430 455 976 2,450 615 16...... 1,180 3,880 1,200 340 320 3,600 9,030 2,190 436 938 1,780 539 17...... 1,780 3,460 1,.100 340 280 4,700 9,370 1,800 513 804 1,380 493 18...... 2,190 2,870 1,000 340 360 5,210 9,370 1,760 821 645 1,010 455 10...... 2,030 2,430 850 360 320 5,470 9,030 1,580 1,090 722 821 412 20...... 1,770 2,030 800 360 340 5,470 8,370 1,440 1,280 1,540 690 361 21...... 1,560 1,540 750 360 »340 5,080 8,050 1,580 1,190 1,650 594 323 22...... 2,280 1,490 750 400 340 4 460 8,050 2,600 1,100 1,160 506 302 23...... 3,350 1,530 750 400 360 3,990 8,700 3,060 1,020 928 461 278 24...... 3,250 1,600 650 400 360 3,990 9,030 2,780 892 804 430 258 25...... 2,960 1,530 650 340 380 4,220 9,030 2,430 762 714 389 245 26...... 2,600 1,540 650 320 400 5,340 8,050 2,190 645 622 344 236 27...... 2,520 2,480 550 420 360 6,980 6,980 1,800 539 545 312 227 28...... 2,780 3,060 550 420 400 8,370 6,840 1,540 461 486 283 254 29...... 2,870 2,960 550 360 420 10,000 7,280 1,290 418 430 278 372 30...... 2,780 3,250 500 360 11,800 7,740 1,120 407 418 278 567 31...... 2,690 500 320 11,800 986 412 297 NOTE. Discharge, Dec. 12, 1919, to Mar. 16, 1920, determined from gage heights corrected for ice effect by means of two discharge measurements, weather records, and study ol gage-height graph. Monthly discharge of Sacandaga River at Hadley, N. Y., for the years ending Sept. SO, 1919 and 1920, [Drainage area, 1,060 square miles.) Discharge in second-feet. Run-ofl Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 3,350 '668 1,290 1.22 , 1-41 5,600 1,090 2,570 2.42 2.70 7,130 1,010 2,470 2.33 2.69 3,560 910 1.750 1.65 1.90 1,190 552 766 .723 .75 8,370 865 4,410 4.16 4; 80 April...... 11,500 2,600 5,580 5.26 5.87 May...... 6,700 2,520 4,560 4.30 4.96 1,800 339 886 .836 .93 July...... 2,270 480 964 .909 1.05.'ei 1,140 263 557 .525 1,380 412 855 .807 .90 11,500 263 2,230 2.10 28.57 1919-20. October ...... 3,350 532 1,840 1.74 2:01 4,220 . 1,490 2,840 2.68 2.99 3,770 500 1,400 1.32 1.52 460 320 367 .346 .40 460 280 370 .349 .38 11,800 360 3,780 3.57 4.12 April...... 12,600 4,820 8,710 8.21 9.17 7,280 986 2,790 2.63 3.03 1,280 407 721 .680 .76 July...... 1,650 387 763 .720 .83 2,450 278 700 .660 .76 615 227 359 .339 .38 12,600 227 2,050 1.93 26.35 206 SURFACE WATER SUPPLY, 1919^1920, PART I. HOOSIC RIVER NEAR EAGLE BRIDGE, N. Y. LOCATION. Half a mile below Walloomsae River ani 1| miles above Owl Kill and Eagle Bridge, Rensselaer County. DRAINAGE AREA. 512 square miles (measured on topographic maps). RECORDS AVAILABLE. August 13, 1910, to September 30, 1920. September 25, 1903, to December 31, 1908, comparable record at Buskirk, 4 miles below. GAGE. Chain gage on left bank near the farm house of James Russell about H miles above Eagle Bridge. Gage read by Dennis Mironowiez. DISCHARGE MEASUREMENTS. Made from cable half a mile below gage or by wading. CHANNEL AND CONTROL. Gravel; somewhat shifting. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30, 1919, 9.45 feet at 5 p. m. March 1 (discharge, 7,920.second-feet); minimum stage recorded, 2.25 feet at 7 p. m. August 3 (discharge, 65 second-feet). Maximum stage recorded for the year ending September 30. 1920, 10.33 feet at 7 a. m. March 27 (discharge, 9,750 second-feet); minimum stage recorded, 2.45 feet at 7 a. m. September 5 (discharge, 91 second-feet). 1910-1920: Maximum stage recorded, 13.5 feet at 7.30 a. m. July 9, 1915 (dis charge, about 16,700 second-feet); minimum stage recorded, 6.1 feet (old datum) at 5 p. m. September 14, 1913 (discharge, practically zero). ICE. Stage-discharge relation affected by ice during most years. REGULATION. Flow affected by storage on Walloomsac River and at Hoosic Falls about 2 miles above gage. ACCURACY. Stage-discharge relation practically permanent during the year 1919 and affected by ice during the period, January to March, 1920. Rating curve well defined between 150 and 9,000 second-feet. Gage read to half-tenths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Records good, except for periods of low water, when semidaily heights may not indicate the true mean, owing to abnormal fluctuation in stage, and for periods of ice effect, for which they are fair. Discharge measurements of Hoosic River near Ezqle Bridye, N. Y., during the years ending Sept. 30. 1919 and 1920. Gage Dis Gage Dis Date. Made by charge. Date. Made by height. charge. 1919. feet. 8ec.-ft. 1920. Feet. 8ec.-ft. Apr. 11 5.69 2.160 Mar. 23 6.13 2,440 Tiilv 4 O. W. Hartwell...... 2.66 146 27 .....do...... 10.00 8,730 Sept. 1 2.86 173 June 27 3.32 346 July 9 Shupe and Currier. .... 3.41 36» 1920. Aug. 25 3.16 298 Jan. 30 B.F.Howe...... 04.81 352 25 .....do...... 3.14 262 Feb. 2fr .....do...... "4.76 309 Stage-discharge relation affected by ice. HUDSON RIVER BASIN. 207 Daily discharge, in second-feet, of Hoosic River near Eagle Bridge, N. Y., for the yearv ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept.. 1918-19. 1...... 765 765 528 1,020 670 4,750 670 800 268 145 178 2...... 610 670 4£0 3,590 6JO 2,100 670 730 196 96 130 3...... 555 528 450 2,210 700 1,190 940 555 165 110 145 4...... 528 582 450 1,770 670 1,280 800 555 165 96 730 610 670 500 1,470 582 1,280 3,870 450 74 185 475, 2,OCO 6...... 980 582 428 1,400 555 1,770 1,880 405 140 152 405 7...... 1,190 610 382 950 640 1,370 1,670 405 205 152 170" 8...... 730 500 450 800 528 1,100 1,570 405 205 185 220- 9...... 700 528 800 750 360 1,100 1,470 360 196 152 1,100 10...... 610 475 450 750 528 2,810 1,670 428 165 185 980 11...... 500 450 360 750 500 1,770 2,210 2,100 450 730 160 610 12...... 428 500 450 528 1,280 3,320 1,990 450 320 178 1,470: 13...... 500 500 405 500 1,100 3,590 3,210 320 235 104 1,470 14...... 610 450 940 450 800 2,33C 1,670 285 214 100 800 15...... 555 382 3,870 500 730 1,990 1,280 302 196 136 670 16...... 450 405 2.450 700 302 800 1,670 1,1CO 360 285 120 730 17...... 405 320 1,670 428 1,190 1,990 1,370 320 360 136 670 18...... v 405 730 1,280 528 2,450 1,880 3.190 475 220 140 528 19 382 2,330 940 405 2,450 1,570 1,770 450 185 185 360 20...... 285 1.77C 870 ?40 1,880 1,370 1,770 450 165 285 302 21...... 700 1,370 800 750 340 2,450 1,28C 1,570 235 152 250 405 22...... 670 1,370 765 800 320 2,400 1,100 3,590 360 235 185 940 23...... 555 1,190 2,930 1,100 220 2,200 940 3,190 285 285 205 1,100 24...... 428 940 1,770 1,990 2£0 2,200 1,020 2,210 235 235 2C5 1,100 25...... 360 940 2,810 1,100 268 2,200 1,020 1,990 320 178 360 905 26 450 870 2,210 940 1,190 2,200 800 1,990 178 178 428 765 27...... 340 610 1,570 980 528 2,400 800 1,670 220 185 190 555 28...... 475 500 1,370 800 500 2,800 940 1,280 500 160 220 500 29...... 360 fM\ 940 800 800 1 '940190 268 152 450 v\ 405 610 800 765 2,400 670 196 14fi 214 382 ql 835 905 670 2,000 800 124 190 1919-20. 1...... 340 1,670 1,990 555 180 200 4,600 2,210 360 360 320 382 2...... 2,330 1,470 610 240 260 5,710 2,100 99/1 405 320 405 2,810 1,280 500 260 200 4,600 1,880 260 268 250 250 4...... 360 2,690 870 360 260 220 4,010 1,990 268 382 220 214 5...... 428 3,730 940 360 280 4CO 4,15C 1,770 28g 320 220 124 6...... 670 < CIO 94tl 750 280 1,«X> 4/600 '1,570 670 340 220 145 7...... 1,100 2,330 940 600 260 1,500 3,190 1,370 610 382 186 250 610 1,990 1,100 400 240 1,600 2,690 1,370 582 382 170 235 9...... 450 1,670 1,370 420 240 1,500 2.100 2,210 450 235 152 220 10...... 800 1,370 2,210 500 280 1,300 1,880 1,670 320 250 428 205 11...... 730 1,570 1,280 500 300 1,100 1,770 1,570 450 220 940 428 12...... 582 2,100 1,190 440 240 2,600 1,670 1,370 302 250 610 320 13...... 555 3,870 1,280 460 260 4,910 1,190 268 405 800 640 14...... 500 3,320 1,880 420 300 6,710 1,100 214 268 1,470 730 15...... 475 2,100 1,280 320 300 2,450 870 235 250 1,670 555 16...... 528 2,100 940 420 260 3,060 905 1,190 250 940 285 17...... 90S 1,470 940 420 320 3,320 905 800 235 700 360 18...... 670 1,370 640 260 340 3,000 3,060 730 2,330 205 670 360 19...... 670 1,190 940 440 320 2,930 765 1,370 320 555 340 20...... 555 1,100 870 500 260 3,060 980 980 670 405 382 21...... 555 940 835 400 260 3,190 1,190 800 360 360 250 22...... 555 870 835 480 240 4,4fO 1,190 730 268 360 235 23...... 556 1,100 905 400 260 3,730 3,870 870 670 220 405 250 24...... Wl 980 870 340 300 4,600 4,910 730 582 235 235 250 25...... 450 428 670 300 280 5,230 3,320 730 405 250 220 235 26...... 450 1,100 730 280 280 7,070 2,570 640 285 382 220 130 27...... 765 5,870 730 300 260 9,0V) 2,330 5?8 340 285 220 205 28...... 870 3,060 610 320 240 4,300 2.930 500 320 22P 196 196 29...... 1,370 1,990 Mff 300 ?20 6,890 3,870 450 382 2fO 152 285 30...... ons 2,690 555 260 fi, 370 2,810 475 382 250 120 670 31...... 1,100 555 280 4,600 340 220 205 NOT*. Discharge, Jan. 4 to Mar. 12, 1920, determined from gage heights corrected for ice eflect by means ol two discharge measurements, weather records, and study ofgage-height graph. Discharge, Jan. 6-23,1919; Mar. 22 to Apr. 10,1919; Mar. 13-22,1920, estimated by comparison with records for Sacandaga River at'Hadley; gage not read. Braced figures show mean discharge for periods included. 208 SURFACE WATER SUPPLY, 1919>-1920, PART I. Monthly discharge ofHoosic River near Eagle Bridge, N. Y.,for the years ending Sept. 30, 1919 and 1920. [Drainage area, 512 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 1,190 285 560 1.09 1.26 November...... 2,330 320 760 1.48 1.65 3,8'<0 360 1,130 2.21 2.55 3,590 670 1,050 2.05 2.36 1,190 220 498 .973 1.01 4,750 730 1,910 3.73 4.30 April...... 3,590 670 1,710 3.34 3.73 3,870 670 1,740 3.40 3.92 June...... 800 178 392 .766 .85 July...... 730 74 217 .424 .49 428 96 182 .355 .41 1,470 130 642 1.25 1.40 4,750 74 903 1.76 23.93 1919-20. 1,370 340 638 1.25 1.44 5,870 428 2,130 4.16 4.64 2,210 555 1,040 2.03 2.34 750 260 416 .812 .94 340 180 268 .523 .56> . 9,040 200 3,060 5.96 6.87 6,710 1,670 3,490 6.82 7.61 May...... 2,210 340 1,170 2.29 2.64 2,330 214 568 1.11 1.24 July...... 670 220 297 .580 .67 1,670 120 452 .883 1.02 730 124 315 .615 .69 The year...... 9,040 120 1,150 2.25 30.66 MOHAWK RIVER AT VISCHER FERRY DAM, TSt. Y. LOCATION. At Vischer Ferry dam on Barge Canal (lock No. 7), 1 mile above Stony Creek and Vischer Ferry, 7 miles below Schenectady, Schenectady County, and 11 miles above mouth. DRAINAGE AREA. 3,430 square miles (measured on topographic maps). RECORDS AVAILABLE. June 24,1913, to September 30,1919. GAGE. Stevens continuous water-stage recorder (showing head on crest of spillway) in the southerly corner of the basin near upper end of Barge Canal lock, installed August 18,1916. Staff gage in masonry of outer lock wall, just above upper gates.. Datum of staff gage 12.1 feet lower than that of recorder. Water-stage recorder inspected by engineers from the Albany office of the United States Geological Survey; staff read by lock tenders. CHANNEL AND CONTROL. The control is the crest of the spillway. EXTREMES OF DISCHARGE. Maximum for year ending September 30,1919, when waste gates in dam were open during spring floods see record at Crescent dam; mini mum stage, from water-stage recorder, 0.21 foot at 10 a. m. December 3 (discharge, 380 second-feet). 1913-1919: Maximum stage recorded, 7.6 feet just before noon March 28,1914, determined by leveling from flood marks (discharge, estimated by New York State engineer, about 140,000 second-feet). This stage lasted but a few moments and was caused by the breaking of an ice jam near Schenectady. Minimum stage from water-stage recorder 0.18 foot from 4 a. m. to 5 a. m. and 4 p. m. to 6 p. m. Oct. 31,1914 (discharge, about 290 second-feet). BASOT. 209 DIVERSIONS. Barge Canal lock No. 7, at the south end of daffi. was pat in openrtioa May 15, 1915. Discharge records inchide the flow over the spillway and through lock and water wheels. REGULATION. Flow affected by operation of dams upstream. ACCURACY. Stage^discharge relation practically permanent; probably not affected by ice. Rating curve well defined hetween 350 and 2,500 second-feet by discharge measurements made in 1913; above 2,500 second-feet, based on theoretic co efficients. Operation of water-stage recorder fairly satisfactory. Daily discharge ascertaroed by Tise of dischargeintegrator. On account of inaccuracies introduced through ^operation of gates «,nd incomplete record of gage heights, records of dis charge fear the y«ar ending September 30,1920, are withheld from publication. Daily discharge,, in 8fOOnd-feet,oJ' Mohawk River at Viseher Ferry dam, N. F.,/ Day. Oat. Nov. Dec. Jan. Feb. Mar. Apr. May. Jane. July. Aug. Siept. 1...... 3,090 15,300 4,030 4 *rtrt 3,520 6,870 10,800 4,380 2,980 1,580 3,080 2 ton 2...... 2,880 .10,500 3,000 10,900 2,650 12,400 9 QKrt « tdt\ 2 Oon 1 840 2 240 2 son 3...... 2,790 7,530 3,060 15,400 2,380 9,900 8,620 9,020 2,300 1^820 1,'370 7,100 4...... 3,640 7,230 3,510 10,200 3 540 8,520 e OCA 6,520 1,820 1 440 1,330 4,720 5...... 3,790 5,630 3,660 fi,580 S'620 8,620 it) aim 8,630 2,260 1,'620 1,390 6,530 6...... 2,950 4,290 4,fl90 4,820 3 4fifl a ssn 13,400 8,120 1,788 1,360 1,740 5,110 7...... 6,750 4,330 3,850 4,530 3,380 7,020 17,400 7.260 2,180 1,140 3,120 3,510 8...... 6,720 3,910 4,240 4,260 3,060 5,390 18,100 8,620 2,030 1,080 %800 2,060 9...... 4, 198 3,230 5,480 n sun 9 74fl 5,920 16,890 7,160 1,860 1 040 2; 190 3,390 10...... 4,300 4,170 7,030 4,390 2,430 14,000 18,800 7,f80 1,940 1,'580 1,980 2,810 11...... 3,290 8,010 7,110 3,260 2,340 12,300 20.200 15,000 1,770 3,670 1,550 3,030 12...... 2,430 3,390 &.88Q 2,650 2,160 8,820 31,700 16,800 1,960 2,740 1,720 2,flTO 13...... 2,720 3,300 5,839 2,480 2,320 7,720 35,100 17,900 1,430 2,400 1,780 2,430 14...... 2,380 3,270 5,510 2,890 2;4S6* -7420 26,600 12,300 1,380 1,920 1,660 2 400 15...... 2,780 2,530 Q Q(tf) a, 650 3 NOTE . Discharge for followingperiods of missing gage-heights taken from record at Crescent dam: Nov. 27-30, Dec. 1-44,18-81, Jan. l-SlTFete-1-3,12-14,17-20, Mar. 26-31, Apr. 1-17, June 21-28. 102721 23 WSP 501 14 210 SURFACE WATER SUPPLY, 1&191-1920, PART I. Monthly discharge of Mohawk River at Vischer Ferry dam, N. Y., for the year ending Sept. SO, 1919. [Drainage area, 3,430 square miles.] Discharge in second-feet. Run-off in Month. Per inches. Maximum. Minimum. Mean. square mile. 20,100 2,150 4,630 1.35 1.56 15,300 2,530 5,090 1.48 1.65 December...... 21,600 3,000 7,300 2.13 2.46 15,400 2,480 5,170 1.51 1.74 4,760 2,160 3,000 .875 .91 16; 800 4,940 9,770 2.85 3.29 April...... 35,100 4,770 12,500 3.64 4.06 May...... 17,900 2,930 8,390 2.45 2.82 3,320 1,310 2,050 .598 .67 July...... 7,930 1,000 2,670 .778- .90 3,150 1,330 '2,010 .586 .68 7,10ff 1,920 3,020 .880 .98 35,100 1,000 5,480 1.59 21.72 MOHAWK RIVER AT CRESCENT DAM, N. Y. LOCATION. At Crescent dam of Barge Canal, 3 miles above mouth of river at Cohoes, Albany County. DRAINAGE AREA. 3,490 square miles (measured on topographic maps by the State engineer department). RECORDS AVAILABLE. December 1, 1917, to September 30, 1920. GAGE. Gurley 7-day graph water-stage recorder on left bank about 50 feet above guard gate at head of Waterford flight of locks. It is about 200 yards from left end of spillway. Inspected by operator from Barge Canal power house at the dam. DISCHARGE MEASUREMENTS. Made;from steel highway bridge at Crescent, about 1J miles upstream. CHANNEL AND CONTROL. The control is the crest of the spillway. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder for year ending September 30, 1919, 7.59 feet at 2 a. m. April 13 (discharge, 38,100 second-feet); minimum stage from water-stage recorder, 4.31 feet at 2 and 8 p. m. July 9 (dis charge, 793 second-feet). Maximum stage from water-stage recorder for year ending September 30, 1920, 9.24 feet at 4 p. m., March 27 (discharge, 67,200 second-feet); minimum stage from water-stage recorder, 4.18 feet at 7 a. m. December 7 (discharge, 428 second-feet). 1917-1920: Maximum stage recorded, that of MareMf27, 1920. Minimium' stage recorded, 4.04 feet at 6 a. m. August 21, 1918 (discharge, 157 second-feet). DIVERSIONS. Water is diverted at this point for canal purposes through lock No. 6 and through the power plant located at this lock. The following tables of dis charge include the flow through lock No. 6 and through the power plant. REGULATION. Seasonal distribution of flow regulated by the Delta reservoir on the upper Mohawk, and by Hinckley reservoir on West Canada Creek. Large diurnal fluctuations occur during low water caused by operation of movable dams upstream. ACCURACY. Stage-discharge relation permanent; probably hot affected by ice. Rating curve well defined between 5,000 and 50,000 second-feet. Record trom water-stage recorder satisfactory. Records good. COOPERATION. Recorder inspected by an employee of the State Superintendent of Public Works. No discharge measurements made at this station during-1919 and 1920. HUDSON RIVER BASEST. 211 Daily discharge, in second-feet, of Mohawk River at Crescent dam, N. Y., for the yetiti ending Sept. SO, 1919 and 1920. Day. Oct. NOT. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 3,220 19,000 4,030 4 Qfln 3,520 6,750 10 800 5,580 3,330 1,320 2,490 1 Sffl 2...... 2 (VIA 12,300 3 AAA 10,900 2 aKf\ 1O OftA 9 ' orn 7,620 9 Q9/1 1 600 2,220 1 oofi 3...... 2,830 R win 15,400 2 OQA 11,600 8,620 ift QUO 3 140 l!.600 1 SfiA 5,870 4...... 3,750 7,080 3,510 10,200 3 080 9 470 8,540 2*510 1.310 1,270 15,600 .5...... 3,560 6,060 3,660 6,580 3' 260 9^470 12,400 1ft Vtrt 2,910 1,470 1,100 6,340 6...... 3 ftGA 4,870 4,690 4,820 3 AQA 1ft ftftft 15 400 9 970 2 EAA 1 OCA 1 240 4,560 7...... K, 7W1 4,420 3 OCA 4,530 2 960 7,830 1?' 400 8 * QOrt 2 7Sft 1,190 2,' 190 3,230 8...... 6',700 4,110 4 240 4,260 2^770 5,890 18' 100 9 O1 ft 2 54Q 1 '923040 2,310 2,580 9...... 4,390 3,560 5'48C 5,340 2 540 6,560 16,800 8.420 2' O^lft 1,800 2.730 10...... 4.080 3 940 7 030 4 3Qft 2' O-l A 1 Q OflA 8,620 2 280 1,160 1,830 2,330 11...... 3,140 3,240 7,110 S Ofift 2,100 15,400 20,200 17,700 3,010 1,400 2,360 12...... 2,720 3 ooA 6,880 2 /> en 2 160 11,200 31.700 2 090 2,470 2,560 13...... 2,580 3,310 5,830 2 AQ(\ 2^320 S OQfV 35,100 91 flftft 1 ? 940 2,220 1,370 2,110 14...... 2.420 3 350 5,510 2 SQft 2,480 26 600 15,100 1? 740 1,720 1 *»ftft 2,180 15...... 2,690 2 OCA 9 240 3,650 3 14ft 7,030 is' 100 10,700 2*220 1,520 1 3ftft 1,870 16...... 2 ccft S ftfift 14,100 4,190 4 ^OA 5,890 14,700 S fiJA 3,470 2 ARft 1,410 1,720 17...... 2,440 2 OCA 11,200 4,260 3 7QA 6,750 IA finfi 7,890 3 CKA 2 /VIA 1,300 2,02O 18...... 2,600 5,320 9,820 3 980 3,]40 15,700 19 fiftft 11,200 S ftfin 2,410 1,260 1,960 19...... 2,220 8,370 4,660 3^980 2 CAA 18,800 10,800 14,200 1,840 2,360 1,820 20...... 2,300 8,170 3 ion 3 01 ft 2 480 14,300 9 AOA 10,600 2 f|f»ft 1,360 1,590 1,S30> 21...... 6,720 4,620 3 01 ft 2,770 14,300 7,]20 Q 7Kft 1 940 1 94ft 1,550 1,540 22...... 7,700 5,620 4,480 2 GOf| 14,600 6,660' 1 J Q4fl 2,770 1,770 1,640 23...... 4 990 5 *>Qft 6,820 3 Q1 ft 2,770 19 ftftft 6,220 1ft Piftft 1 840 1,630 2, 110 24...... 4,190 4,100 14,300 5,120 2 QQA 10,400 in CAft l'&40 3,750 1,620 3,290 25...... s s>;n 4,310 QA onn 6,580 2 CQA 6 840 9 SI ft 1,'410 2 OCA 2,470 2,490 26...... 3,900 4,340 21,600 3,580 ift ^ftft 7,320 9 0Af) 1,310 2,470 1,960 2,130 27...... 7,840 3 CEA 13,400 5,580 3 460 9 OCA 6,840 7,160 1.570 2^220 1,630 2,22O 28...... 5 OCA °, *tW\ S QCn 4,970 3,650 n ftAft 5,800 i;830 7 230 1 CLIft 2,41O 29...... 5,090 3,210 6,150 4,600 16,800 7,120 41690 2,110 5' 940 1,630 2,020' 30...... 4,710 4,240 4,620 4,260 13,400 7,020 3,740 1,850 3,600 1,470 2,28» 31...... 21,500 4,480 3,910 11,800 2 ncn 2,890 2,190 1919-20. 2,200 14,100 10 400 2 QAft 2 980 1 ftQft OC OAft 18 900 2 050 1,820 1,630 1,910 2...... 2,210 9,060 2,770 2J sfift 1,740 14 Qflft 2J 040 1,580 1,580 3...... 2,430 7,670 2,480 2 4.7ft 1,790 35,200 12,200 2,270 1,690 1,520 4...... 2,430 8,680 5 4fift 2,480 2,410 1 ftQfl 28,300 8,710 2 AAft i ofin 1,900 1,490 5...... 2,480 13,100 8,260 2,160 2,920 1,840 23,800 5,350 2,720 1,860 1,260 1,350 6...... 2,450 4,490 2 ftCA 2 74ft 2,140 35,200 4 650 2 OCA 2,120 1,260 1,330 7...... 4,860 8,390 2,560 2,350 2,520 23,100 5.' 060 2:290 1,480 1,480 1.300 8...... 3,820 5 1 ^ft 2 630 2 0(^1 3 sin 17 VM1 4,620 2 0AA 1,870 1,700 1 320 9...... 4,010 5,560 6,070 2,' 980 4,350 13,500 5,760 2,780 1,620 1,520 1.170 10...... 4,960 5,310 12,900 3,110 2,090 4,690 11,500 5,910 2,420 1,670 1,460 1,580 11...... 5,820 5,320 13,600 2,980 2,090 4,690 11,100 5,520 2,100 1,440 3,080 1,580 12...... 4,370 9,620 9,500 2,630 1 QQfl 4,910 11,200 i oon 1,850 5,320 2,980 13...... 3,370 11,600 8,850 2,570 1,990 15,700 11,100 5,450 1,660 1,880 3,890 15,700 14...... 3,370 12,100 17,000 2,630 2,090 33,100 15,200 4,840 1,650 2.230 3,760 7,440 15...... 2,820 9,610 14,460 2,250 2,140 22,400 18,900 -4,860 1,760 2; 240 5,460 3,880 16...... 3,570 7,460 8,180 2,350 1,840 14,400 4,010 1,910 3,030 3,760 2,650 17...... 6,540 6,170 6 fUfl 3,110 1 7Oft 26 700 1C OAft 3,680 2,720 2,160 3,640 3,200 18...... 5,240 5,460 3,900 2,920 1 70ft *>A Aftf) 18,900 3,060 9,580 1,770 2,600 19...... 4,870 5 JAA Q osn 2 7dfl 1 740 26,700 i ^ unft 4,290 9 OCA 1,650 1,950 20...... 3,880 4,660 4,490 2,800 1*70ft 12 900 5,600 3,360 2,200 1,800 21...... 3,360 4,230 4,550 2,980 1,940 16,900 11,800 4,920 4,360 3,390 2,290 1,460 22...... 7,200 3,690 4,770 2,980 2,190 13,700 20,300 5,900 3,370 1,820 2,340 1,100 23...... 9,720 5,920 4,770 2,920 2 noft 10 fiAft 23,100 5,800 3 94A 1 (\Af\ 1,580 1,570 24...... 6,810 6,170 4,690 2,860 1 990 rtO 4AA 4,250 2,650 1,670 1,820 1,620 25...... 4,790 6,090 4,690 3,110 l!940 34,400 20,300 5,100 2,160 2,660 1,960 2,000 26...... 4,870 6,620 4,210 2 Qcn 1 Q4ft 42,500 14,900 3 AtZf\ 2,360 1,''8501 980 1,860 1,240 27...... 8,020 25,400 3,860 2,800 1,990 56,100 11,900 3,800 1,680 1,720 1,250 28...... 8,180 17,800 3,800 2,630 2,140 55,400 13,200 3,500 1,670 1,940 1.640 2,350 29...... 7,570 10,500 3,480 2,630 1 QQfl 2,850 1,670 1,680 1,510 2,870 30...... 6,530 3,220 2,570 40 000 91 finn 2 J.fcA 2,220 1,920 1,360 4,520 31...... 6,920 3,040 2,470 36,800 2,570 1,380 1,230 NOTE. Discharge through lock and power plant estimated May 31, 1919, Oct. 12-18,1919; data missing. No gage-height record May 23-29,1920, July 15-17, 1920; discharge estimated from record at Vise£er Ferry dam. "212 SURFACE WATER SUPPLY, 1919-1930, PART I. Monthly discharge of Mohawk River at Crescent dam, AT. Y., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 3,490 square miles.} Discharge in second-feet. Run-cff Month. Per in Maximum. Minimum. Mean. square inches. mile. 1918-19. 21,500 2,220 4,630 1.33 1.53 19,000 2,850 5,420 1.55 1.73 21,600 3,000 7,410 2.12 2.44 January ...... 15,400 2,480 5,170 1.48 1.71 4,390 2,100 2,930 .840 .87 Mardi ...... 18,800 5,890 11,200 3.21 3.70 35,100 5,800 13,100 3.75 4.18 "Way,, . . 21,600 2,980 9,980 2.85 3.29 3,550 1,310 2,290 .6.56 .73 July...... 7/230 923 2,390 .685 .79 2,490 1,100 1,700 .487 .56 15,600 1,540 2,990 .857 .96 35,100 923 5,790 1.66 22.49 1919-20. October...... 9,720 2,200 4,830 1.38 1.59 25,400 3,690 9,200 2.64 2.94 17,000 2,560 6,680 1.91 2.20 3,110 2,050 2,710 .777 .90 2,980 1,740 2.160 .619 .67 56,100 1,690 19,700 5.64 6.50 April...... 36,000 11,100 19,600 5.62 6.2-7 May...... 18,900 2,480 5,630 1.61 1.86 9,580 1,650 2,910 .834 .93 July...... 3,390 1,380 1.990 .570 .66 5,460 1,230 2,320 .665 .77 4,520 1,100 2,610 .748 .83 The year...... 56.100 1,100 6,700 1.92 26.12 WEST CANADA CREEK AT HIHCKLEY, W. Y. LOCATION. One mile below Hinckley dam at Hinckley, Oneida County, and one- fourth mile below New York Central Railroad bridge. DRAINAGE AREA. 373 square miles (measured on topographic maps). RECORDS AVAILABLE. June 14, 1919, to September 30, 1920. GAGE. Gurley 7-day graph water-stage recorder on the right bank, about 1 mile below Hinckley dam installed June 14, 1919. Recorder inspected by W. H. Thomas, gate tender at dam. DISCHARGE MEASUREMENTS. Made from a cable about 1,000 feet upstream from CHANNEL AND CONTROL. Large boulders on solid rock bottom; practically per manent. EXTREMES OP DISCHARGE. Maximum stage from water-stage recorder, for period ending September 30, 1919, 4.32 feet several times in September (discharge, 798 second-feet); minimum stage from water-stage recorder, 2.53 feet at 12.30 p. m. August 31 (discharge, 8 second-feet) due to closing of gates in dam. Maximum stage from water-stage recorder, for year ending September 30, 1920, 7.08 feet 8 a. m. to noon April 24 (discharge, 5,900 second-feet); minimum stage from water-stage recorder, 2.61 feet at 6.30 p. m. September 18 (discharge, 16 second-feet). 1919-1920: Maximum stage from water-stage recorder, 7.08 feet at 8 a. m. April 24, 1920 (discharge, 5,900 second-feet); minimum stage from water-stage recorder, 2.53 feet at 12.30 p. m. August 31,1919 (discharge, 8 second-feet), caused by closing of gates in dam. HUP8QN RiVEB BASIF. ICE. Stage-diecharge relation not affected by ice. REGULATION. Seasonal flow regulated by (storage in Hinckley reservoir. Diurnal flow affected slightly at low stage by operation of the Fibre Co.'e mill at Hinckley, DIVERSIONS. Consolidated Water Co. of Utica diverts water supply for Utka from Hinckley reservoir. ACCURACY. Stage-discharge relation permanent. Bating curve well defined between 100 and 4,000 second-feet. Operation of water-stage recorder satisfactory through out the year. Daily discharge ascertained by applying to rating table, mean daily gage height determined by inspection of gage-height graph, or for days of considerable fluctuation by averaging discharge for intervals of the day. Records good. COOPERATION. Station installed by Utica Gas & Electric Co. Discharge measurements of West Canada Creek at Hinckky, N. Y., during the years- ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge- 1919. Feet. See.-ft. 1919. Feet. See.-ft. J. W. Moulton...... 638 Oct. 14 1 &7ft 14 3.90 489 14 .....do...... 5.05 1,680 27 J. W. Moulton...... 3.81 417 19 4.36 845- 29 .....do...... 652 29 .....do...... 3.48 278 1920. 29 .....do...... 3.04 112 Apr. 17 B. F. Howe...... 5.10 1,790- Sept. 24 4.30 780 27 .....do...... 6.66 24 .....do...... 4.30 742 27 .....do...... 5.66 2,520 Oct. 13 4.71 1,190 30 .....do...... 6.22 3,490- 13 .....do...... 4.71 1,170 30 .....do...... 6.22 3,480- 13 .....do...... 4.89 1,440 July 21 S.M. Currier...... 3.77 402 13 .....do...... 4.89 1,420 Sept. 28 14 .....do...... 5.01 1,590 terhahn...... 4.20 736- Daily discharge, in second'fwt, of West Canada Creek at Hinckley, N. Y.,for the year ending Sept. 30,1919 and 1920. Day. June. July. Aug. Sept. Day. June. July. Aug. Sept. 1919. 1919. 1...... 434 468 204 16...... 479 451 484 700- 2...... 434 4S6 538 17...... 479 451 484 700' 3...... 434 434 550 18...... 479 456 502 700 4...... 64 445 600 !«...... 473 451 496 700 5...... 445 440 700 20...... 404 445 490 700 6 ...... 445 445 700 M...... 418 451 490 700> 7...... 451 462 700 22...... 413 451 490 700 8...... 445 473 700 23...... 418 446 831 780 9...... 445 479 660 24...... 418 451 532 780- W...... 462 484 660 25...... 418 451 53S .780 11...... 445 490 660 26...... 424 456 826 780 12...... 451 490 660 27...... 440 456 526 780 13...... 451 490 700 28...... 440 462 526 78O 14...... 473 456 484 700 29...... 386 468 665 780> 15...... 473 456 484 700 30...... 440 468 156 780» 31...... 473 75 1 214 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of West Canada Creek at Hinckley, N. Y., for the year ending Sept. 30, 1919 and 1920 Continued. Day. Cot. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aua;. Sept. 1919-20. 1...... 780 2,600 2,120 1,060 870 367 1,420 2,980 *;i4. 424 4on 620 2...... 825 2,600 1,830 1,060 870 353 1,480 2,440 514 408 520 620 ,3...... 870 2,040 1,420 1,060 870 324 1,550 2,040 520 403 550 620 4...... 870 1.690 1,180 1,010 Q7A 305 1,620 1,830 KOA 398 550 620 5...... 870 1,480 1,010 870 398 1,690 1,620 526 398 544 620 6...... 851 1,420 1,060 1,010 825 538 1,690 1,400 526 403 538 620 7...... 1,060 1,300 1 060 1,010 825 550 1,690 1,120 532 424 550 620 8...... 1 550 1,240 I'oio 1,010 7$m 1,690 1,120 526 dIS 550 620 9...... I'seo 1,060 1,060 1.010 780 1,690 1,180 526 413 550 620 10...... 1,480 1,010 1,080 Qfifl 7Ort 620 1,690 i ism dQfi dOQ «;v» 11...... 1,620 1,010 925 930 740 585 1,690 1,180 462 440 550 620 12...... 1,420 1,010 Ofifl 7jn 550 1,690 1,180 462 550 620 13...... 1,240 1, 930 1,050 960 700 620 1,690 1,120 440 445 550 620 14...... 1 200 1 Qftft Of fl 700 74n 1,760 1,180 451 445 550 620 15...... 1^060 2,120 1 Q7fl 930 700 825 2,040 1,060 445 434 550 6">o 16...... 1,060 1,690 1,480 915 fififi 740 2,600 960 451 434 550 660 17...... 1,420 1,360 1,180 915 660 700 3,380 960 451 440 585 700 18...... 1,760 1,180 Q1 f\ 700 3,380 870 445 4.9Q 620 361 19...... 1,480 1,030 s7n 915 620 780 2,980 780 456 445 620 293 20...... 1,240 1,060 870 870 660 740 2,980 740 451 434 620 700 21...... 1,120 1,060 870 870 740 740 3,600 740 462 429 620 700 22...... 1,970 1,060 QfiA 915 4,830 456 434 620 - ggo 23...... 2,780 1,060 1,030 9J5 620 5,390 740 445 434 620 660 24...... 2 (\A(\ 1,060 1,030 960 ecft 01 ^ 5,680 7dft 451 A9Q 620 660 25...... 1,690 1 060 1, 030 Ofifl 1,120 4,300 740 4.d^ 413 620 700 26...... 1 4'>0 1,060 1,030 960 1,120 3,180 740 451 620 700 27...... 1^760 1,060 1,030 915 440 1,240 2,600 740 440 434 620 700 28...... 1,970 1,080 1,050 Q1 f» 418 2,600 740 451 479 620 700 29...... 1,900 1,180 1,060 915 382 1,360 3,600 668 440 490 620 700 30...... 1,690 1,550 1,030 01 NOTE. Discharge, Jan. 18-20 and 27-31, 1820, determined from estimated gage-height graph; recorder pencil made no record. Monthly discharge of West Canada Creek at Hinckley, N. Y., for the years ending Sept. 80; 1919 and 1920. [Drainage area, 373 square miles] Discharge in second-feet. Run-off in Month. Per inches. Maximum. Minimum. Mean. square mile. 1919. June 14-30...... 479 386 440 1.18 0.75 July...... 473 434 451 1.21 1.40 665 75 462 1.24 1.43 780 204 688 1.84 2.05 1919-20. 2,780 780 1,420 3.81 4.39 2,600 1,010 1,420 3.81 4.25 2,120 825 1,170 3.14 3.62 1,060 870 958 2.57 2.96 870 382 688 1.84 1.98 1,420 305 762 2.04 2.35 April...... 5.680 1,420 2,660 7.13 7.96 2,980 520 1,120 3.00 3.46 532 434 473 1.27 1.42 July...... 496 398 434 1.16 1.34 620 490 579 1.55 1.79 700 293 630 1.69 1.89 5,680 293 1,020 2.73 37.41 HUDSON RIVER BASER. NINEMILE FEEDER NEAR HOLLAND PATENT, N. Y. LOCATION. At mouth of Ninemile feeder, half a mile below highway bridge near farm of P. A. Wade, 4 miles east of Holland Patent, Oneida County. RECORDS AVAILABLE. June 5, 1919, to September 30, 1920. GAGE. Gurley 7-day graph water-stage recorder on right bank, about 50 feet above spillway. Recorder inspected by P. A. Wade and D. G. Humphrey. DISCHARGE MEASUREMENTS. -Made from highway bridge half a mile upstream from gage or by wading. CONTROL. Suppressed weir of concrete with a lip about 1.5 feet high and a spillway inclined about 1:2. Permanent. REGULATION. Flow in the feeder is regulated by gates at the intake of the canal just below the power plant at Trenton Falls. DIVERSIONS. None. ICE. Feeder canal not in operation during winter. ACCURACY. Rating table well defined between 30 and 200 second-feet. A new rating table, based on results of later measurements was used beginning October 1, 1919. This table differs only slightly at medium stages from the one used in 1919. Daily discharge ascertained by applying mean daily gage height to rating table, or for days of considerable fluctuation by discharge integration. Records good. Ninemile feeder diverts water from West Canada Creek just below the Trenton Falls Power Co.'s plant at Trenton Falls and discharges into Ninemile Creek at a point one and one-half miles west of South Trenton and 4 miles east of Holland Patent, The diverted water flows down Ninemile Creek and feeds the summit level of the Barge Canal near Oriskany. Discharge measurements of Ninemile feeder near Holland Patent, N. Y., during the years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height charge. .919. Feet. Sec.-ft. 1919. ' Feet. Sec.-ft. 1.72 104 Oct. 30 12.17 143 14 .,.. .do...... 1.585 93.4 Nov. 1 .....do...... 2.43 173 28 .....do...... 1.50 89.8 1 .....do...... 2.43 175 July 19 O. W. Hartwoll...... 1.48 83.9 19 1.45 82.6 1920. 20 0. W. Hartwell. ...:.>.. 1 84 1.52 91.5 20 1.84 118 July 15 B. F. Howe...... 1.47 83.1 Oct. 14 1.83 119 Sept. 28 1.51 87.1 30 .....do...... 2.18 144 Lamoareux. SURFACE WATEK SUPPLY, ; 1919^1920, PART I. Daily discharge, in second-feet, of Nmentile feeder near Holland Patent, N. Y., for the years ending Sept. SO, 1919 and 1920. Day. June. July. Aug: Sept. Day. Oct. Nov. June. July. Aug. Sept. 1919. 1919-20. 1...... 85 80 1...... 107 166 88 81 90 2...... : 85 87 2...... 114 142 86 79 89 3...... 85 97 97 \...... 91 12» Ml SO - 88 85 120 93 4...... 16 124 86 79 ' 87 5...... 86 124 88 5...... 69 122 85 78 87 6...... 105 85 124 84 6...... 132 114 85 78 89 7...... 101 ce 123 83 7...... m 85 78 on 8...... 102 85 123 81 8...... 125 111 S3. 85 87 9...... 101 84 124 89 9...... 127 110 83 86 86 10...... 95 92 124 70 10...... 125 110 QA 86 O7 11...... 93 88 78 11...... 121 118 W 85 Sfi 12...... 94 85 77 12...... 116 1H 84 84 88 13...... 94 Rf» 86 13...... 114 122 S3 84 07- 14...... 94. 85 125 126 H...... 112 129 85 83 84 15...... QJ. 90 1OE 197 15...... 120 84 82 QA 16...... 94 86 125 126 16-...... 118 113 S3 83 86 17...... 94 85 124 191 17...... 114 109 S3 82 Ri 18...... 94 or 127 124 18...... m 106 QO 82 19...... Ot OK 10E 123 19...... 103 87 82 65 20...... 92 102. 125 123 20...... 110 102 83 82 97 21...... 92 100 124 122 21...... 191 102 82 83 63 22...... 90 99 123 123 22...... m 104 82 88 61 23...... 91 98 128 23...... 118 107 so 82 on 91 24...... iiy> 110 90 97 118 24...... HH 86 83 90 QK*60 25...... ofl Qfi 120 116 116 103 89 R* Qft 26...... 90 114 124 109 88 82 on Q^ 27...... 92 120 27...... 129 106 88 81 98 91 28...... 86 28...... 134 99 88 8? 89 89 29...... 85 112 110 29...... 126 87 81 90 86 .30'...... 86 95 109 30...... 142 8* 8t n 86 31...... 76 31...... 177 82 90 NOTE. Water-stage recorder not in operation July 26 to August 2, 1919. Daily discharge not Monthly discharge of Ninemile feeder near Holland Patent, N. Y., for the years ending Sept».#Q, "191$ aM 1920. Discharge in second-feet. Maximum. Minimum. Mew. IMS-lft June 6-30...... 105 85 93.3 July 1-25...... 102 84 88.9 A ugust 3-31 ...... 127 76 118 127 77 104 1919-20. 177 16 116 November 1-28 ...... 166 99 115 June 23-30...... 89 86 88.0 July...... 87 81 83.4 91 78 84.5 97 60 WALLKILL RIVER AT PELLETS ISLAKD MOUNTAIN, N. T. LOCATION. At highway bridge in village of Pellets Island Mountain, 4$ miles south of Middletown, Orange County, and 5J miles below mouth of Pochuck Creek. DRAINAGE AREA. 385 square miles (measured on topographic maps). RECORDS AVAILABLE. December 29-, 1919, to September 30, 1920. GAGE. Chain gage on downstream side of highway bridge, installed January 17, 1920. Previous readings were made from temporary staff gage attached to pile on right bank under bridge. Gage read by Leo Grohoski. DISCHARGE MEASUREMENTS. Made from downstream side of highway bridge. BASW. 21T CHANJCBI, AND e&wmoz>. Channel mostly silt and control coarse gravel; fairly permanent. EXTREMES OF UISCHAHOE, Maximum stage recorded during period of'record, 20. r feet at 7.30 a. m. March 16 (discharge, 8,350 second-feet; stage-discharge relation affected by ice). Minimum stage recorded, 8.2 feet at 7.30 a. m. and 6.30 p. m.. September 4. Minimum discharge, 136- second-feet on February 6. ICE. Stage-discharge relation affected by ice. ACCURACY. Stage-discharge relation practically permanent; affected by ice during: a large part of period from December to March. Bating curve well defined between 100 and 2,500 second-feet. Gage readings uncertain during parts o£ period; corrected by means of comparative hydrographs and gage heights ofc discharge measurements. Records fair for all periods. Discharge measurements of Wallkill River at Pellets Island Mountain, N. Y., during the year ending Sept. SO, 1920. Gage Dis Gage Dis Date. Made by charge. Date. Made by charge. Fett. Stc.-ft. Feet. Sec.-ft. Dec. 15 11.05 1,160 Apr. 2 12.82 2,180 29 .....do...... »9.23 378 3 Lautertiahn and I>ufly. 13.05 2,40ft. 29 .....do...... a 9. 33 393 22 C. C. Covert...... 11.33 1,350 Jan. 17 Covert and Lauterhahn »8.70 222 June 20 Howeapd Lauterhalm. 10.45 870- Feb. 11 »8.60 174 8.33 15T Mar. 19 a 19. 09 6,580 3 .....do...... 8.39 156- o Stage- Day. Dec. Jan. Feb. Mar. Apr. May. June, July. Aug. Sept. 1...... 280 we 160 2..420 890 476- 755 675 238 2...... 280 160 170 2,350 845 476 755 595 182 3...... 289 160 189 2,5*0 830 4ff5- 9«r 517 152 4...... 220 180 170 2.630 755 475 1,049 446 133. 5...... L tso 170 220' ,:$28ft 678 42& 635 448 152 6...... lift 130 220 2,560 517 800 276 319 182 7...... 320 M& 220 3,160 448 800- 263 259 204 8...... 320 190 390 3,426 412 715 268 236. 204 9...... 320 160 1.800 2,70B 380 555 235 201 226 19...... 468 170 1,900 1,899 334- 404 204 28$ 250- 11...... 600 170 1,988 1,590- 349 890 15Z 25(T r 276 12...... 606 180 2,260 1,M* 4*8 i 940, 23$ 33* 31& 13...... 480 180 3,600 1,040 517 890 715 517 380 14...... 380 160 5,500 1,040 446 843 99* 305 429> 15...... 300 160 7,5flO 94» 36* I 675 1,140 : 596 *29- 16...... 206" 19ft 8,000 946' 263 ! 517 i,a» 5*!v 4*1 17...... '...... 230 220 8,000 900 229 5J7 1,470 675 517 18...... 180 220 7,500 1,040 204 4*51 1,470 $00 517 19...... iao 20ff 6,500 1.090: 182 517 1,660. 755 517 20...... 150 228 4,800 1,04ft 215 715 1,590. 585 517 21...... 150 220 4,400 940 429 715 1,410 555 396 22...... 150 190 4,400 1.090 585 ' 785- 1,3SO 917 349> 23...... 150 200 4,800 .l'240 595 1,040 1,090 481 334 24...... 140 220 4,900 L190 517 940 755 429 270- 25...... 140 200 5,500 1,040 517 1,040 940 396 226 26...... 150 180 5,200 890 448 1,040 1,040 354 319 27...... 160 150 4,500 845 446 1,040 1,040 290 429 28...... 180 170 4,600 940 555 845 940 250 595- 29...... 380 190 160 3,,T70 949 51? . 845 845 226 «7S 30...... 34ft 206 3,2«0 800 5-17 i 755 736 220 75& 31...... 300 170 2,860 517 755 290. N«TE. Discharge, D«e. 28 to Mar. 22, determined from gage heights corrected for ice effect by means of five discharge measurements, study of discharge hydtograph, and comparison with other streams. Dis charge estimated" because of missing gage heights, Dec. 30, Tan. 1,2", 7-9, re, Way 31, June 1-4, and July I by interpolation and comparison witn records for other stations. 218 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Wallkill River at Pellets Island Mountain, N. Y., for the year ending Sept. 30, 1920. Discharge in second-feet. Run-oft in Month. Per inches. . Maximum. Minimum. Mean. square mile. December 29-31...... 380 300 340 0.884 0.10 600 140 253 .658 .76 220 130 178 .462 .50 8,000 160 3,520 9.15 10.55 3,420 800 1,560 4.05 4.52 May...... 890 182 480 1.25 1.44 1,040 429 722 1.88 2.10 July...... 1,650 152 870 2.26 2.61 800 204 440 1.14 1.31 755 133 355 .923 1.03 The period...... 8,000 130 931 2.42 24.92 DELAWARE RIVER BASIN. EAST BRANCH OF DELAWARE RIVER AT FISH'EDDY, N. Y. LOCATION. At railway bridge in village of Fish Eddy, Delaware County, 4 miles below mouth of Beaver Kill and 5J miles above confluence of East and West branches. DRAINAGE AREA. 790 square miles (measured on post route map). RECORDS AVAILABLE. November 19, 1912, to September 30, 1920. GAGE. Staff, in two sections, on downstream end of left pier of railroad bridge; read by J. P. Lyons. DISCHARGE MEASUREMENTS. Made from highway bridge about 200 feet above the gage or by wading. CHANNEL AND CONTROL. Coarse gravel; occasionally shifting. EXTREMES OP DISCHARGE. Maximum stage recorded for year ending September 30, 1919, 8.4 fe,et at 4 p. m. April 12 (discharge, 8,390 second-feet); minimum stage recorded, 2.18 at 6 p. m. June 26 (discharge, 292 second-feet). Maximum stage recorded for year ending September 30, 1920, 18.0 feet at 8 a. m. March 13 (stage-discharge relation affected by ice). Maximum daily dis charge, 19,500 second-feet on March 13; minimum stage recorded, 2.31 feet at 8 a. m. and 4 p. m. October 4 (discharge 344 second-feet). Minimum daily dis charge, 280 second-feet, February 27 to March 3. J912-1920: Maximum stage for open water, 17.4 feet during the afternoon of March 27, 1913, determined by leveling from flood marks (discharge, about 33,500 second-feet); minimum stage recorded, 1.64 feet at 5 p. m. October 12, 14, and 15, 1914 (discharge, 97 second-feet). ICE. Stage-discharge relation affected by ice. ACCURACY. Stage-discharge relation apparently permanent except as affected by ice. Rating curve well defined between 200 and 20,000 second-feet. Gage read to hun- dredths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Open-water records good; j*cords for period of ice effect, fair. Discharge measurements of East Branch of Delaware River at Fish Eddy, N. Y., during the years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by charge. Date. Made by- height. charge. 1019. Feet. Sec.-ft. 1920. Feet. Se:.-ft. Mar. 15 J.W.Moulton...... 4.25 1,770 05.00 327 May 8 .....do...... 3.92 1,480 Mar. 31 8.54 9,650 Ail". 26 9 V7 4.09 Apr. 23 5.64 3,380 26 .....do...... 2.56 437 2.55 452 Sept. 9 Currier and Lamoureux. 3.15 6SS a Stage-discharge relation affected by ice. DELAWARE BIVEE BASIN. 219 Daily discharge, in second-feet, of East Branch of Delaware River at Fish Eddy, N. Y:, for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19 1...... 920 1,080 650 2,100 1.000 3,180 2,200 2,100 650 362 1,040 430 2...... 850 1,080 650 5,440 920 3.3SO 2,000 2,210 590 362 850 408 0 710 1,080 650 3,910 920 2,550 1,690 2,100 560 340 815 4...... 710 1,040 59ft 2,670 850 2,210 2,100 1,890 560 340 650 3,180 5...... 710 1,000 505 2,430 850 2,210 3,050 1,690 530 300 620 6...... 2,920 1,000 430 2,100 780 2,100 3,610 1,690 530 320 745 2,210 7...... 2,550 920 430 1,890 710 2,100 3,460 1,500 505 430 2,920 1,890 8...... 2,100 920 430 1,790 590 1,890 3,320 1,410 505 . 385 2,100 1,500 9...... 1,890 850 480 1,790 530 3,180 3,180 2,210 480 362 1,360 1,500 10...... 1,590 780 530 1,690 505 3,050 3,320 3,320 480 385 1,320 1,320 11...... 1.500 780 590 1,690 480 2,320 4,230 4,730 480 362 745 1,160 12...... 1,320 680 590 1,690 455 1,890 8,180 4,560 480 340 590 850 13...... 1,320 590 850 1,690 455 1,690 7,360 4,390 430 340 530 590 14...... 1,320 530 1,320 1.590 1,080 1,690 4,560 4,230 430 340 480 590 15...... 1,160 530 3,460 1,590 920 1,690 4,390 3,180 1,160 340 455 590 16...... 1,040 ,- 530 2,790 1,410 920 1,690 4,560 2,550 1,320 340 408 590 17...... 920 590 2,320 1,240 850 1,890 4,900 2,320 920 320 385 560 18...... 850 780 2,210 1,080 620 3,610 4,230 3,050 850 300 430 530 19...... 850 780 2,100 1,080 590 3,460 4,230 2,670 680 1,080 385 530 20...... 920 780 1,690 1,080 590 3,320 3,610 2,550 560 1,500 385 505 21...... 1,000 710 1,320 1,000 560 3,050 2,790 2,320 530 1,500 362 530 22...... 1,080 710 1,320 1,000 530 2,790 2,790 2,550 505 6,380 362 505 23...... 1,080 710 6,380 1,160 505 2,210 1,890 3,050 430 5,260 745 530 24...... 1,160 710 7,160 2,920 505 1,990 1,790 2,670 300 4,900 620 680 25...... 1,240 710 3,320 2,100 505 1,990 1,690 2,100 300 4,560 560 590 X..'...... 1,160 710 2,790 1,690 505 1,890 1,500 1,790 300 3,320 530 530 27...... 1,080 710 2,210 1,320 505 3,910 1,500 1,690 480 3,910 530 480 28...... 1,080 680 2,100 1,160 590 4,230 1,410 1,690 850 2,670 530 480 29...... 1,080 650 1,890 1,080 3,760 1,410 1,590 560 2,210 480 430 30...... 1,080 650 1,790 1,000 2,430 1,590 1,410 505 1,990 455 - 385 31...... 1,080 1,790 1,000 2,320 960 1,690 430 1919-20. 1...... 1,500 3,610 650 300 280 8,820 2,550 590 74^ 1,320 620 2...... 362 1,410 3,460 600 300 280 10,100 2,210 560 650 1,320 590 3...... 340 3,610 1,790 550 300 280 9,700 2,100 480 620 1,320 590 4...... 340 5,080 1,690 500 300 300 7,970 2,100 505 1,080 1,240 590 5...... 385 4-560 1,500 480 320 700 6,760 2,100 1 710- 920 1,240 590 6...... 362 4,560 1,500 460 340 4,000 6,760 1,990 710 745 1,240 920 7...... 480 4,560 1,410 440 340 5,400 6,000 1,790 710 710 1,080 885 8...... 430 4,390 1,500 420 340 5,000 5,260 1,790 620 1,080 920 850 9...... 408 4,070 2,790 420 340 4,000 3,460 1,500 530 1,890 620 780 10...... 4W 3,910 2,100 420 340 3,400 2,550 1,500 505 1,590 455 11...... 530 3,610 1,890 420 340 4,400 2,550 1,240 480 1,500 1,240 12...... 590 3,050 1,790 420 340 7,160 2,430 1,160 480 2,320 2,320 ,2,660 13...... 590 2,320 1,790 420 340 19.500 5,440 1.320 710 1,990 3,320 14...... 530 2,790 1,790 380 340 9,480 5,260 1,690 650 1,790 3,760 15....:...... 560 2,550 1,690 ' 320 360 6,380 3,910 1,500 530 1,590 3,050 16...... fiw 2,320 1,690 320 380 4,730 3,760 1,500 4QA 1,410 2 790 1.890 17...... 1,500 2,210 1,600 300 380 9,260 3,610 1,500 1,160 1,240 2,550 ],500 18...... 1,410 2,210 1,500 360 340 6.000 3,460 1,410 3,910 1,240 2,550 1,320 19...... 1,320 2,100 1,400 380 340 4,560 3,050 1,410 1,890 1,160 3,610 1,240 20...... 1,320 2,100 1,300 340 340 3,910 2,550 1,410 1,500 1,160 2,790 1,240 21...... 1,320 2,100 1,300 340 340 3,050 3,050 1,320 1,080 1,160 2,430 1,160 22...... 1,160 2,100 1,200 340 340 3,050 3,610 1,320 920 1,080 1,500 1,080 23...... 1,160 1,990 1,200 340 300 4,230 3,460 1,320 815 2,100 1 000 1,080 24...... 1,000 1,880 1,200 340 300 6,380 3,320 1.160 885 9,700 920 1,040 25...... 1,890 1,100 360 300 8,390 2,790 1,000 850 6,960 885 745 26...... 920 3,180 1,100 360 300 10,100 2,320 780 650 3,760 710 680 27...... OCA IT 7ftA 1,000 360 280 13,200 2.210 620 620 2,550 710 590 28...... , 920 9 7ftA 900 340 280 10,100 2,100 590 590 1,990 710 710 29...... 1,160 5,440 850 300 280 9,260 2,100 590 590 1,690 650 710 30...... 1,240 4,230 800 300 9,040 2,550 590 850 1,410 650 2,920 31...... 1,590 750 300 8,820 590 1,320 620 NOTE. Discharge, Dec. 17,1919, to Mar.-ll and Mar. 13,1920, determined from gage heights corrected for ice effect By means of one discharge measurement and study of gage-height graph and weather records. Mean daily discharge Apr. 1-2,1919, Sept. 10-15,1920, estimated from comparative hydrographs; no gage- height record. Gage heights estimated oy observer Get. 20-26,1918. 220 SURFACE WATER SUPPLY, 19>19>~19'20, PART I. Monthly discharge of East Branch of Delaware River at Fish Eddy, N. Y., for the years ending Sept. SO,, 1919 and 19%0. [Drainage area, 780 square miles.] Discharge in second-feet. Run-off Month. Per in Maximum- Minimum. Mean. square inches. * mile. 1918-19. 2,920 710 1.230 1.56 1.80 November...... 1,080 530 776 .980 1.09 December ...... 7,160 430 1,780 2.25 2.59 5,440 1,000 1,790 2.27 2.62 1,080 455 672 .851 .89 March...... 4,230 1,690 2,570 3.25 3.75 April...... 8,180 1,410 3,220 4,08 4.55 May...... 4,730 960 2,460 3.11 3.58 June...... 1,320 300 582 .737 .82 July...... 6,380 300 1,520 1.92 2.21 2,920 362 736 .932 1.07 3,180 385 909 L15 1.28 The year...... 8,180 300 1,530 1.94 26.25 1919-20. 1,590 340 S12 1.03 1.19 No/ember...... 13.700 1,410 3,640 4.61 5.14 3,610 750 1,590 2.01 2.32 650 300 396 .502 .58 February...... 380 280 326 .412 .44 19,500 280 5,960 7.54 8.69 10,100 2,100 4,360 5.52 6.16 May...... 2,550 590 1,410 1.78 2.05 3,910 430 860 1.08 1.20 July...... 9,700 620 1,910 2.42 2.79 3,760 455 1,600 2.03 2.34 590 1,340 1.70 l.W 19,500 280 2,020 2.56 34.80 DELAWARE BITSR AT PORT JERVIS, XT. T. LOCATION. At toll bridge at Port Jervis, Orange County, 1 mile above Neversink River and 6 miles below Mongaup River. ^BAS&A&E. .AREA. 3,070 square milef (revised). RECORDS AVAILABLE, October 12, 1904, to September 30, 1920. GAGE. Staff jfl two sections; the upper section vertical and attached to downstream end of lefi'fcbutnaent; the lower section inclined, about 30 ieet downstream. On March 14, 1920, the facing board of the inclined section wae carried out. After that date a chain gage on the bridge was used. Gage read by John Bisland. DISCHARGE MEASUREMENTS. Made from the highway bridge or by wading. CHANNEL AND CONTROL. Gravel; occasionally shifting. EXTREMES OP DISCHARGE. Maximum stage recorded, during the year ending Sep tember 30, 1919, 7.12 feet at 5 p. m. March 10 (discharge, 21,300 second-feet); minimum stage recorded, 1.5 feet at 8 a. m. and 5 p. m. July 9 (discharge, 686 second-feet). Maximum stage recorded, during the year ending September 30, 1920, 14.0 feet at 5 p. m. March 13 (discharge, 75,500 SQpond-feet); minimum daily discharge, 1,100 second-feet March 1, 2, and 4. 1904-1920: Maximum stage 12 recorded, 16.0 feet at 8 a. m. March 28, 1914 (discharge, 92,700 second-feet); minimum stage recorded, 0.60 foot at 8 a. m. Sep tember 22 and 23, 1908 (discharge, 175 second-feet). ICE. Stage-discharge relation usually affected by ice during large part of January and February. * "The flood of Oct. 10-11,1903, reached a stage of 23.3 fe«t,according to Mr. Irring Rightw, city en gineer. The eorrespondiag dise'aa-ge was about 155,000 seeond-feet. DELAWARE BIVER BASIK. 221 ACCURACY. Stage-discharge relation practically permanent. Bating curve used fairly well defined below 2,500 second-feet and well defined between 2,500 and 30,000 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying mean daily gage height to rating tabte. Open-water records good except those for low and high stages which are fair. Records for period of ice effect fair. COOPERATION. Gage-height record obtained in cooperation with United States Weather Bureau. Discharge measurements of Delaware River at Port Jervis, JV. Y., during the years ending Sept. SO, 1919 and 1920. ^ Gage Dis. Gage Dis Date. Made by charge. Bate. Made by- freight. charge. 1919. Feet. Sec.-ft. 19?0. Feet. Sec.-ft. May 10 J.W.Moulton...... 3.90 5,310 Mar. 19 7.28 23,300 2.12 i ^ftn May 29 3.01 3,300 Aug. 28 2.42 1,820 5.09 9,310 July 31 Covert and Graver . . . . . 3,31 4,080 1920. S«pt. 4 Currier and Lamoureus, 2.44 1,870 Mar. 3 o3.04 1,260 .....do...... 135 1,7JO a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Delaware River at Port Jervis, N. Y.,for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. D«C. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1913-19. 1...... 2,920 7.810 2.470 5,680 3,650 7,090 7,488 4,750 8,400 1,550 2.690 1,470 2...... 2,690 6,350 2.070 7,430 3,910 16,200 6,350 5,360 2,920 1,390 2,920 1,390 3...... 2 4.7(1 5,050 1,980 12,600 2,470 11 600 6.010 7.060 2,690 1.110 2,470 1,470 4...... 2,680 4,460 1,980 10,300 2.260 9,010 5.680 6.010 2,470 1,1050 1,9% 6,500 5...... 2,920 3,400 1,980 7,430 2,690 7,810 7,430 5,050 2,260 935 1,890 10,300 6...... 3,160 4,460 1,800 5,360 2.690 7,810 8.200 4,750 2,070 1,050 1,980 2,920 7...... 13,100 3,910 1,720 5,680 2,260 7,810 8,600 4,460 2,470 1,180 9,840 2,260 8...... 8,600 3,910 1,640 6,700 1,890 6,700 8,600 4,460. 2,470 1,110 7,810 1,890 9...... 6,010 2.920 1.890 6,700 1,890 7,810 9.420 4,460 2,470 685 4,460 1,720 10...... 4,750 2,690 2,070 5,680 1,720 20,500 9,010 7,060 2,070 1,110 3,160 1,550 11...... 4,180 2,470 1,800 4,180 1,550 15,100 7,810 15,700 1,980 1,050 2,690 1,980 12...... 3,910 2,470 1,800 3,910 1,550 12,100 16,200 14,600 1,890 1,050 2,260 2,070 13...... 3,650 2,260 2,260 3,400 1,550 10,300 19,200 13.100 1,720 1,110 1,980 2,260 14...... 3,400 2,070 3,400 1 QSfl 8,200 14, 100 12, 100 1, 550 ' 1,320 2,070 2,070 15...... 2,920 1,980 4,180 3,650 3,400 6,700 11,600 9,840 1,550 1,110 2,470 1,730 16...... 2,690 1,890 8.600 4.180 4,750 6,700 6,350 8,600 3,400 990 2,690 1,550 17...... 2,470 1,800 7,430 3.650 4,180 8.200 16.800 8,200 3,400 990 2,470 1,470 18...... 2,260 2,470 6,010 3,650 3,650 10,700 15,700 10,300 3,160 1,110 2,260 1.470 19...... 1,980 3,910 4,750 3.650 2,690 13,600 12.100 9,010 2,690 1,640 2,470 1,640 20...... 1,890 4,460 3,910 3,400 1,980 10,700 10,700 7,430 2,070 2,260 3,160 1.640 21...... 1,720 3,910 3,910 2,920 1,990 9,010 8,600 7,060 2,070 3,650 2,690 1,180 22...... 1,720 3,400 3,910 2,920 1,890 8,600 8,200 12,100 2,260 7,430 2,070 1,110 23...... 2,690 2,920 9,010 2,260 7,810 7,060 8,200 1,890 12,100 1,980 1,470 24...... 2,470 2,690 12,600 5,680 2,260 7,060 6,350 9,420 1,550 8, 00 1,980 2,870 25...... 2,070 2,690 14,100 8,600 2,260 6,350 6,350 8,200 1,390 6,350 2.470 2,260 26...... 2,070 2,470 15,100 6,7«0 2.690 5,680 6,350 7,430 1,720 4,460 2,260 2,260 27...... 2,260 2 260 10,700 6.350 2 920 5.050 5,680 6,350 1,720 4,180 1,890 1,890 28...... 2,260 2,070 8,600 S.360 2,690 7,810 5,360 5,680 2,070 4.750 1,390 1,720 29...... 2,260 2,260 7,430 4,750 10,300 5,380 4,750 2,070 4,750 1,720 1,580 30...... 2,260 2,470 7,080 4,460 8,200 5,360 4,180 1,980 3,650 1,840 1,390 31...... 3,160 5,680 4,180 8,200 3,650 2,920 1,580 222 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Delaware River at Port Jervis, N. Y., for the years ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. APr- May. June. July. Aug. Sept. 1919-20. 1...... 1,390 4,460 12,100 1,600 1,200 1,100 29,700 7,430 2,470 3,160 3,910 2,260 2...... 1,130 11,200 11,600 i ^inn 1,100 OQ 7flfl 6 OKA 3ann 3 A(V\ 2,070 3...... 1,840 14,600 9,420 1,700 1 200 1 nf\f\ 00 AArt 7 060 2,070 S lftrt 2,920 1 890 4...... in ^nn 6,700 1,700 1,100 6,700 1 QQA 4 460 2,470 5...... 1,550 10,700 4 460 1 600 1 OrtA 91 ftftfl 2,470 3,650 9 9fin 1,550 6...... 1,390 10,700 4,180 1 600 1 400 2 600 24 600 5 QAA 3 400 2,070 1 t\%fl 7...... 1,390 10,700 4,750 1,600 1 Af)Ct 5,500 21,' 200 4,750 4,460 2^470 1,890 2,920 1 OQA OflA 8...... 8,200 5 ' l'1 600 1 CLflfl 11,000 15,700 3,650 1 890 3,160 9...... 1,390 7,060 6,010 1,500 9,500 i Q Ann 4 460 2 oon 2 1918-19. 13,100 1,720 3,340 1.09 1.26 November...... 1 ...... 7,810 1,800 3,260 1.06 1.18 15,100 1,840 5,200 1.69 1.95 12,600 2,920 5,340 1.74 2.01 4,750 1,550 2,560 .834 .87 March...... 20,500 5,050 9,310 3.03 3.4» April...... 19,200 5,360 9,070 2.95 3.29 15,700 3,650 7,720 2.51 2.88 3,400 1,390 2,250 .733 .82 July...... 12,100 685 2,790 .909 1.05 9,840 1,550 2,770 .902 1.04 September... . ^...... 10,300 1,110 2,210 .720 .80 20,500 685 4,670 1.52 20.64 1919-20. 3,650 1,130 2,000 .651 .75 25,300 3,400 8,650 2.82 3.15 12,100 1,900 5,830 1.90 2.19 1,800 1,200 1,500 .489 .56 February...... 1,500 1,200 1,330 .433 .47 50,900 1,100 21,200 6.91 7.97 32,000 6,700 13,500 i 4.40 4.91 May...... 7,810 2,470 4,980 1.62 1.87 June...... 10,300 1,800 3,490 1.14 1.27 July...... 29,700 1,800 5,120 1.67 1.92 8,600 1,720 3,670 1.20 1.38 15,700 1,650 4,140 1.35 1.51 The year ...... 50.900 1.100 6.300 2.05 27.95 DELAWABE EIVEE BASIN. 22S DELAWARE RIVER AT RIEGELSVILLE, N. J. LOCATION. At "toll suspension bridge between Riegelsville, N. J., and Riegelsville,. Pa., 600 feet above Musconetcong River and 9 miles below Lehigh^River. DRAINAGE AREA. 6,430 square miles. RECORDS AVAILABLE. July 3, 1906, to September 30, 1920. GAGE. Staff in three sections installed November 14, 1914, on left bank (New Jersey side) at upstream side of bridge; lower section inclined, middlejand upper sections vertical. Prior to November 14, 1914, chain gage attached to upstream side of bridge. Gage read by Herbert J. Bernholz to February 1, 1920, and after that date by Thomas A. Lippincott. DISCHARGE MEASUREMENTS. Made from bridge. CHANNEL AND CONTROL. Large boulders; practically permanent. EXTREMES OP DISCHARGE. Maximum stage recorded for year ending September 30^ 1919, 11,1 feet at 9 a. m. March 11 (discharge, 38,700 second-feet); minimum stage recorded 2.7 feet at 4 p. m. July 13 (discharge, 2,730 second-feet). Maximum discharge for year ending September 30, 1920, estimated, 120,000' second-feet (gage height not read) March 14; minimum stage recorded 2.45 feet at 3 p. m. February 28 and 3 p. m. February 29 (discharge, 2,250 second-feet). 1906-1920: Maximum stage 13 recorded,' 25 feet March 28, 1913 (discharge- 144,000 second-feet); minimum stage recorded, 1.55 feet at 8 a. m. September 20,. 1908 (discharge, 870 second-feet). ICE. Stage-discharge relation affected by ice during severe winters only. DIVERSIONS. The Delaware division of the Pennsylvania canal diverts about 230- second-feet from Lehigh River near its mouth from about the last of March to the- middle of December each year. ACCURACY. Stage-discharge relation practically permanent; not affected by ice during winter of 1918-19; seriously affected by ice during winter 1919-20; rating^ curve well defined. Gage read to quarter-tenths twice a day. Daily discharge- obtained by applying mean daily gage height to rating table; discharge for periods- of ice effect estimated from observer's notes, and records of precipitation and temperature. Records good. Discharge measurements of Delaware River at Riegelsville, N. J., during the year ending- Sept. 30, 1920. Gage Dis Date. Made by height. charge. Feet. Sec.jt. , Mar. 23 10.14 32,500- June 8 a H. L. Landis...... 4.67 8,320- a Delaware Division canal measured by G. C. Stevens and found to be carrying 235 second-feet. lllt has been estimated that the flood of October 10-11,1903, reached a discharge of 275,000 second-feet. 224 SURFACE WATEK SUPPLy, 1919-18®), PAST-I. .Daily discharge, in second-feet, of Delaware River at Rieqd&vitte, N. 3., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. F«b. Mar. Apr. May. Jane. July. Aug. Sept. 1...... 6,230 5,920 5,010 13,190 9, WO 12,000 17 100 10,800 3,150 «,230 9,166 4,710 2...... 5,310 8,480 4,420 17,100 7,490 23,009 15,400 11,600 7,490 5,610 8,150 4,42* 3...... 4,420 7,490 4,420 21,100 6,850 29,900 13,900 12,400 7,170 5,010 7,490 4,420 4...... 4,420 6,856 4,149 24,500 6,850 21,600 13)106 IS, 009 6.396 4, W8 6,*» 5,310 5...... 4,140 6,850 3,880 23,000 7,170 18,800 13,100 10,900 5,920 3,630 5,610 8,480 6...... 4,140 6,850 3,880 21,60Q 6,850 1«,790 H,«00 9,500 6,850 3,890 6,850 6,540 7...... 4,428 8,230 4,140 17,500 5,929 15,800 15,466 9,160 7,820 8,630 9,500 5,920 8...... 12,400 5,610 3,880 14,600 5,610 14,200 14,000 9,500 6,540 3,880 17,500 5,310 9...... 10,500 5,010 3,630 12,700 5,310 18,000 14,600 8,820 6,850 3,630 13,500 5,010 10...... 7,820 4,710 3,390 10,900 5/010 SB, 330 IS, 800 10,200 «,85O 8,380 9,840 4,430 11...... 6,540 4,420 3,390 »,MO 8,880 36,800 14,206 18, 400 6,28ft 3,880 8,150 5,010 12...... 5,610 4,149 3,880 7,829 4,140 96,680 W,700 28,800 5,618 3,39» 6,856 5,929 13...... 5,610 3,880 4,420 7,490 3,880 25,600 21,200 24,500 5,010 2,730 6,850 5,610 14...... 5,010 3,380 5.920 7,170 §,310 21,100 25,600 21,100 4,7*0 2,940 10,380 5,010 15...... 4,420 3,390 10,900 8,150 8,150 17,100 21,600 19,300 5,010 3,889 8,840 4,420 16...... 4,140 3,288 14,606 8,480 11,200 15,800 IS, 890 17,108 7,820 4,420 6,490 4,140 17...... 4,140 3,630 15,000 8,150 10,200 17,100 25,080 17,100 7,490 3,630 8,820 3,630 18...... 3,880 4,421 16,800 10,309 12,400 22,100 35,100 20,700 7,170 3,280 8, 849 4,140 19...... 3,630 7,170 12,700 9,849 9,840 25,«00 29,300 18,800 6,850 5, (HO 9.500 3,880 20...... 3,399 «,500 10,200 8,480 6,230 23,600 24,009 1«,300 6,546 7,496 8,820 3,880 ~2£21...... 3,390 7,820 8,480 8,150 5,920 20,700 18,800 15,400 6,230 13,500 8, 150 3,390 4,420 6,353 8,480 7,490 6,280 18,400 16,300 18,800 5,310 30,790 8,490 3,390 23...... 5,010 5,610 8,820 8,480 5,920 16,708 15.000 20,700 4,710 32,100 7, 170 3,280 24...... 4.420 5,310 8,820 13,100 6,850 14,600 13,980 21, MO 4,420 27,708 6,230 3,880 25...... 3,880 5,010 10,200 17,10ft 7,170 13,500 13,500 20,700 3,880 21,600 6,238 5,016 26...... 3,630 4,710 11,«60 17,1«0 8,820 12,400 13,100 17, 190 4,42® 15,860 5,920 4,71i 27...... 3,390 4,420 12,400 15,400 10.200 11,600 12,400 15,400 7,490 13,900 5,010 4,140 28...... 3,398 3,880 13,900 13,906 9,500 18,080 11,200 13,990 10,900 12,700 4,716 3,880 -29...... 3,630 5,010 15,000 11,600 23,000 10,900 12,400 8,820 11,206 4,426 3,630 30...... 3,888 5,010 12,400 10,000 20,200 10,580 10,500 7,490 9,840 4,420 3, 390 31...... 4,140 10,200 9,508 18,490 9,308 9, W0 4,710 1019-20. 3,390 7,820 24,500 5,310 3,050 2,340 5£,300 14,200 5,010 4,420 9,500 5,310 2...... 3,880 13,100 22,800 5,500 3,050 3,390 48,400 14,200 5,010 5,010 9,160 4,420 3...... 4,420 19,300 19.708 5,000 3,099 3,890 58,708 14,200 5,«1Q 5,819 7,490 3,880 4...... 3,880 23,000 15,400 5,000 2.940 4,140 48,400 14,200 5,010 5,610 6,540 3,880 5...... 3,160 25,«00 13,100 5,000 3,050 5,310 56,006 13,909 5,018 7,490 5,920 3,390 6...... 3,390 22,100 10,900 5,000 3,390 7,820 49,700 13,300 6,230 6,230 5,810 3,390 7...... 3,630 19,300 11,600 5,000 4,710 4,420 48,400 12,700 8,820 5,010 5,610 8,820 8...... 3,390 18,000 12,700 5,300 4,800 3,390 32,100 9,500 8,480 4,710 5,610 8,820 9...... 3,050 15,800 14,200 7,000 3,600 3,630 27,100 10,200 6,850 4,140 5,310 6,850 ao...... 3,160 13,500 15,400 9,500 3,200 5,920 22,60C 8,820 6,230 4,420 4,710 7.820 n...... 3,160 11,600 15,400 7,820 2,800 7,820 22,100 8,820 5.920 3,880 4,420 8,150 12...... 3,630 12,400 15,000 6,230 2,530 25,600 18,400 9,160 5,010 3,880 5,610 9,500 13...... 4,420 17,100 18,800 5,500 2,440 27,100 18,400 10,900 5,010 3,880 6,540 18,800 14...... 4,420 22,600 18,000 5,000 2,530 120,000 20,200 12,400 5,010 6,230 8,150 18,000 15...... 5,610 22,100 16,000 4,800 2,530 56,000 26,100 12,400 5,920 6,540 11,600 14,290 16...... 6,230 19,300 16,000 4,400 2,530 48,000 19,300 13,900 5,310 6,850 13,100 9,160 17...... 7,170 16,300 16,000 4,200 2,530 62,000 21^669 13,100 5,010 6 236 11,690 9,500 18...... 8,150 13,900 14,008 3,800 3,390 64,000 23,500 8,820 7,170 5,016 12,090 8,150 19...... 7,490 12.000 12,000 3,800 4,140 52,000 21,100 8,820 18,000 4,420 14,600 7,170 20...... 6,540 11,200 13,000 3,800 3,630 44,000 18,400 8,150 .14,200 7,490 13,100 6,230 21...... 5,610 10,200 12,000 4.400 3,390 35,000 18,800 7,820 11,200 7,170 10,900 5,610 22...... 4,710 8,820 10,200 4,420 3,630 33,000 20,700 11,286 9,500 6,230 10,500 4,420 23...... 4,710 8,150 8,150 4,420 3,880 32,700 19,700 11,600 8,150 15,400 8,150 5,010 24...... 5.920 8,480 7,500 4,420 4,140 48,400 19,300 11,600 7,490 18,000 7.170 5,010 25...... 5,610 7,820 7,000 3,880 3,880 6b,800 18,400 9,840 6,540 35,000 6,230 4,420 26...... 5,010 10,200 6,000 3,880 3,630 89,200 16,300 9,500 5,610 32,100 5,920 3,880 27...... 4,420 13,900 6,000 3,880 3,390 102,000 14,600 8,820 5,010 18,000 5,010 4,710 28...... 5,610 27,700 5,610 3,880 2,340 92,300 14,200 8,480 4,710 17,100 4,400 4,140 29...... 5,310 28,800 5,310 3,880 2,250 63,100 14,600 6,540 4,140 13,100 4,200 5,010 30...... 5,310 26,600 6,230 3,280 61,700 14,600 6,540 3,880 10,900 4,420 7,170 31...... 6,540 6,230 3,050 54,600 6,230 9,500 5,010 NOTE. Middle section ol gage removed by ice during winter of 1917-18. Chain gage used during high water. During March, 1920, observer made high-water readings on a staff gage at railroad bridge at mouth of Musconetcong River. No determined relation between this gage and regular gages. Gage not read Dec. 12, 15-21, 24-27, 1919; Jan. 5-9; Feb. 8-11, 1920; discharge estimated. Discharge also estimated Jan. 2-4 and 13-21,1920. when stage-discharge relation was affected by ice and Mar. 14-22 and July 25,1920, when gage at railroad bridge was read. DELAWARE RIVER BASIN. 225 Monthly discharge of Delaware River at Riegelsville, N. J., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 6,430 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 12,400 3,390 4,950 0.806 0.93 9,500 3,280 5,510 .893 1.00 16,300 3,390 8,340 1.30 1.50 24,500 7,170 12,700 1.98 2.28 12,400 3,880 7,220 1.12 1.17 36,300 11,600 20,000 3.13 3.61 35,100 10,500 17,200 2.71 3.02 May...... 28,800 8,820 15,600 2.46 2.84 10,900 3,880 6,530 1.05 1.17 July...... 32,100 2,730 8, 750 1.40 1.61 17,500 4,420 7,970 1.28 1.48 8,480 3,280 4,630 .756 .84 36,300 2,730 9,980 1.57 21.45 1919-20. 8,150 3,050 4,870 .793 .91 28, 800 7,820 16,200 2.55 2.84 24,500 5,310 12, 700 1.99 2.29 9,500 3,050 4,860 .756 .87 4,800 2,250 3,2fiO .507 .55 120, 000 2,340 39,600 6.16 7.10 56,700 14,200 27,500 4.31 4-81 May...... 14,200 6,230 10,600 1.70 1.96 18,000 3,880 6,820 1.09 1.22 July...... 35,000 3,880 9,340 1.49 1.72 14,600 4,200 7,670 1.23 1.42 18,800 3,390 7,160 1.15 1.28 120,000 2,250 12,600 1.98 26.97 NOTE. No water in canal Dec. 7, 1918, to Mar. 16,1919, and Dec. 6, 1919, to Mar. 22, 1920. To allow for water, diverted by the canal, 230 second-feet was added to daily discharge Oct. 1, to Dec. 6,1918, Mar. 17 to Dec. 5,1919, and Mar. 23 to Sept. 30, 1920, before computing discharge per square mile; the first three columns of the table therefore indicate actual quantity of water flowing in river; the two remaining columns represent the total run-off from drainage area above Riegelsville including the discharge of the canal. BEAVER KILL AT COOKS FALLS, N. Y. LOCATION. At covered highway bridge in Cooks Falls, Delaware County. DRAINAGE AREA. 236 square miles (measured on post route and topographic maps). RECORDS AVAILABLE. July 25, 1913, to September 30, 1920. GAGE. Vertical staff in three sections, bolted to rock on left bank under the bridge; read by H. B. Couch. DISCHARGE MEASUREMENTS. Made from the bridge or by wading. CHANNEL AND CONTROL. Coarse gravel, boulders, and solid ledge; shifts occasionally. EXTREMES OF DISCHARGE. Maximum stage recorded for year ending September 30, 1919, 7.5 feet at 11 a. m. July 22 (discharge, 3,720 second-feet); minimum stage recorded, 1.26 feet at 11 a. m. and 7 p. m. July 18 (discharge, 86 second-feet). Maximum stage recorded for year ending September 30, 1920, 9.5 feet at 11 a. m. March 13 (ice effect), (discharge, 5,000 second-feet); minimum stage re corded, 1.90 feet 11 a. m. and 7 p. m. January 31 (ice effect), (discharge, about 65 second-feet). 1913-1920: Maximum stage recorded, 12.4 feet at 5 p. m. October 30, 1917 (discharge, about 9,700 second-feet); minimum stage recorded, 0.70 foot from 7 a. m. October 12 to 7 a. m. October 13,1916 (discharge, 30 second-feet). 102721 23 WSP 501 15 226 SURFACE WATER SUPPLY, 1919-1920, PART I. ICE. Stage-discharge relation somewhat affected by ice. ACCURACY. Stage-discharge relation not permanent. Three rating curves used; two used from October 1, 1917, to March 31, 1918, and from April 1, 1918, to March 13,1920, well denned between 50 and 4,500 second-feet; and one used from March 18,1920, well defined between 300 and 4,000 second-feet. Gage read twice daily to hundredths until March 13, 1920, and to tenths after March 18. Daily dis charge ascertained by applying mean daily gage height to rating table. Open- watej; records good; records for period of ice effect fair. Discharge measurements of Beaver Kill at Cooks Falls, N. Y., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.Jt. 1920. Feet. Sec.-ft. Mar. 15 J.W.Moulton...... o2.88 522 Feb. 12 o2.28 122 .....do...... 2.73 458 Mar. 2 .....do...... o2.10 90 Aug. 27 1 64 1 fV7 1 Q 4.72 1,540 27 .....do...... 1.65 159 Apr. 1 6.88 3,420 Nov. 17 3.11 624 23 C.C. Covert...... 4.29 1,360 ihahn. June 18 Howe and Lauterhahn. 4.18 1,220 Aug. 3 2.20 340 1920. Sept. 8 Covert and Lamoureux. 1.86 218 o2.26 124 a Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Beaver Kill at Cooks Falls, N. Y.,for the years ending Sept. 30, 1918-1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1917-18. 1...... 186 1,730 371 200 130 1,240 750 415 167 68 212 2...... 186 1,400 355 190 130 1,690 660 330 167 64 106 3...... 175 1,080 355 190 120 1,690 570 287 136 61 68 244 805 325 190 120 1,830 530 261 146 59 61 5...... 269 705 310 190 120 1,370 1,180 490 261 136 74 58 6...... 208 615 282 190 110 950 450 236 119 66 57 7...... -- 186 282 256 200 110 850 415 315 119 60 58 8...... 175 404 244 190 110 750 330 287 119 58 57 220 325 232 190 110 805 1,300 315 224 115 58 57 10...... 164 310 220 200 110 830 1,360 315 224 136 58 55 11...... 154 296 200 200 805 1,180 315 200 146 103 56 12...... 310 282 200 200 755 1,000 301 315 136 97 56 13...... 244 296 200 200 855 850 315 301 156 82 65 14...... 340 296 200 200 1,020 950 490 248 224 66 58 15...... 355 296 200 200 755 1,240 615 224 274 105 56 16...... 310 269 190 200 705 1,300 450 189 156 75 55 17...... 256 282 200 200 855 1,120 415 178 136 65 54 is 232 325 200 200 1,260 1,830 380 167 136 59 56 232 310 200 200 1,730 1,300 345 167 115 58 106 20...... 530 296 200 190 584 2,240 1,000 345 146 105 56 89 21...... 490 282 200 180 2,720 1,690 380 136 95 54 274 22...... 325 404 200 180 3,310 2,590 345 800 91 53 146 23...... 282 1,140 190 170 2,960 1,620 345 see 85 53 114 24...... 530 615 186 170 2,160 1,300 315 287 81 52 160 25...... 910 371 197 170 1,940 1,060 301 224 79 98 91 26...... 570 355 197 160 1,660 8% 415 200 77 60 490 27...... 1,590 340 208 160 1,400 750 380 167 74 55 850 28...... 1,260 325 197 160 1,020 660 345 156 69 53 450 29...... 1,940 340 200 150 910 660 287 156 71 64 287 30...... 7,110 387 200 140 1,260 750 415 146 70 60 236 31...... 2.400 200 130 1,260 490 76 53 DKLAWAEE BIVEE BASIN. 227 Daily discharge, in second-feet, of Beaver Kill at Cooks Falls, N. Y.,for the years ending Sept. 30, 1918-1920 Continued, , Day. Oct. Nov. Dec. ' Jan. Feb. Mar. Apr. May. June. July. Aug. Sept 1918-19. 1...... 224 750 274 615 261 2,910 660 530 300 126 415 146 2...... 212 570 236 1,760 261 1,060 570 1,000 274 119 330 189 3...... 380 530 236 1.060 261 705 615 750 261 108 287 490 4...... 274 450 236 1,060. 301 660 750 650 248 102 261 660 5...... 248 450 224 850 261 800 850 570 224 92 236 345 6...... 530 415 189 705 248 900 1,420 530 236 136 490 274 7...... 660 362 156 615 236 850 1,060 490 248 146 1,420 224 8...... 450 330 189 660 224 660 1,000 450 230 113 750 200 9...... 345 301 236 570 212 2,040 950 490 212 95 490 178 10...... 301 287 200 530 200 1,690 850 1,120 189 124 380 178 11...... 274 274 212 450 156 1,180 1,000 1,300 167 167 345 212 12...... 261 261 236 450 189 900 2,430 1,060 156 126 287 212 13...... 261 248 212 362 200 750 1,240 1,000 146 105 274 178 14...... 261 236 236 330 236 705 1,180 800 136 97 287 167 15...... 236 224 1,120 380 315 530 1,000 750 400 91 287 146. 16...... 224 146 1,060 362 224 530 1,420 705 570 105 261 146 17...... 212 112 750 345 189 570 2,110 950 330 100 274 167 18...... 200 301 615 345 212 1,420 1,420 950 236 86 287 146 19...... 200 415 490 345 136 1,060 1,180 850 189 850 274 126 20...... 189 362 415 248 146 850 950 705 189 800 248 122: 21...... 950 315 345 236 189 850 850 750 212 1,000 212 122. 22...... 415 301 415 570 189 800 750 750 200 3,260 212 122' 23...... 345 261 2,590 236 167 750 660 1,000 136 1,550 200 224 24...... 301 261 1,300 1.060 167 705 615 750 126 900 200 189- 25...... 274 248 2,430 615 136 615 615 660 122 705 200 156 26...... 287 248 1,550 570 287 570 800 615 124 570 167 136 27...... 315 236 1,180 450 189 570 615 530 345 1,360 156 124 28...... 301 236 950 380 189 1,690 615 450 315 705 189 112 29...... 287 345 750 362 1,120 570 450 285 570 167 105 30...... 345 315 660 345 950 530 380 156 415 146 102 31...... 1,060 570 315 750 330 345 146 1919-20. 1...... 102 450 950 190 80 90 3,490 805 222 320 390 165 2...... 105 420 750 150 90 90 4,650 760 210 260 320 155 3...... 126 1,100 660 130 100 95 3,760 715 210 760 320 136 4...... 110 1,500 490 130 100 95 2,800 625 187 625 275 127 5...... 105 1,360 415 140 120 360 3,400 585 338 505 260 124 6...... 136 800 490 140 120 1,700 2,880 545 408 320 235 129- 7...... 146 750 490 150 120 1,700 1,920 465 290 425 222 39O 8...... 121 660 490 150 120 1,400 1,430 465 260 290 210 210- 9...... 106 570 660 150 120 1,100 1,060 425 210 260 198 165 10...... 156 530 1,060 150 120 900 905 425 187 210 187 355 11...... 189 490 660 140 130 750 905 465 165 187 505 390 12...... 167 660 660 140 120 1,000 855 1,060 165 372 355 620 13...... 146 1,970 750 140 130 5,000 3,490 625 320 390 545 805 14...... 146 1,180 1,480 130 130 2,500 2,080 625 235 320 465 585- 15...... 224 900 850 130 110 1,500 1,500 545 165 625 390 465 16...... 212 750 660 130 90 1,200 1,500 505 165 372 290 390 17...... 530 660 570 120 90 2,000 1,430 465 260 290 275 238 18...... 362 615 450 120 140 1,300 1,360 465 1,180 290 715 290 19...... 301 570 450 110 140 1,180 1,240 425 625 305 505 260 20...... 274 450 570 100 110 1,010 1,120 390 505 390 390 235 21...... 236 380 530 100 100 855 1,180 465 425 290 320 222 22...... 274 415 450 95 100 805 2,400 545 390 260 260 210 23...... 261 415 415 90 100 1,300 2,320 505 355 1,010 260 198 24...... 224 362 415 85 100 2,400 1,500 425 320 4,870 210 187 25...... 212 345 362 80 90 2,960 1,240 390 290 2,560 198 176 26...... 212 705 330 80 85 3,220 855 355 235 1,920 176 176 27...... 224 2,990 301 100 80 3,140 805 320 210 1,240 165 165 28...... 261 1,690 236 110 80 3,050 905 290 210 905 145 338. 29...... 261 1,300 189 100 80 3,140 1.010 260 585 625 248 26O 30...... 261 1,300 224 90 3,220 1,010 235 390 505 210 625 31...... 615 220 65 3,400 235 425 176 NOTE. Discharge Dec. 11-23, 1917, and Dec. 29, 1917, to Feb. 10, 1918, estimated, because of ice, from discharge measurements, weather records, study of gage-height graph and comparison with similar studies for East Branch of Delaware River at Fish Eddy. Braced figures show mean discharge for periods indi cated. Discharge, Apr. 1,1918, to Sept. 30,1918, has been revised and supersedes data published in Water- Supply Paper 471, p. 164. Discharge Dec. 31,1919, to Mar. 13,1920, determined from gage heights corrected for ice effect by mean& of three discharge measurements and study of gage-height graph and weather records. Discharge. May 4, 1919, June 1, 8,15, 22, and 29,1919, Nov. 1-4,1919, Mar. 14-17,1920, and Sept. 12,1920, estimated by com parison with records for East Branch of Delaware River at Fish Eddy; gage not read. 228 SURFACE WATER SUPPLY, 1919^-1920, PART I. Monthly discharge of Beaver Kill at Cooks Falls, N. Y., for the years ending Sept, SO, 1918-1920. [Drainage area, 236 square iniles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1917-18. October ...... 7,110 154 722 3.06 3.53 1,730 269 505 2.14 2.39 371 176 230 .975 1.12 200 130 184 .780 .90 417 1.77 1.84 3,310 705 1, 420 6.02 6.94 2,590 660 1,220 5.17 5.77 750 287 414 1.75 2.02 800 136 250 1.06 1.18 July...... 274 69 123 .521 .60 August ...... 105 52 66 .280 .32 850 54 149 .631 .70 7,110 52 475 2.0JL 27.31 1918-19. October...... 1,060 189 349 1.48 1.71 750 112 326 ' 1.38 1.54 2,590 156 654 2.77 3.19 1,760 236 554 2.35 2.71 February...... 315 136 214 .911 .95 2,910 530 972 4.12 4.75 2,430 530 976 4.14 4.62 May...... 1,300 330 720 3.05 3.52 570 122 232 .983 1.10 July...... 3,260 86 486 2.06 2.38 1,420 146 319 1.35 1.56 660 102 197 .835 .93 3,260 86 503 2.13 28.96 1919-20. 615 102 220 .932 1.07 2,990 345 876 3.71 4.14 1,480 189 556 2.36 2.72 January ...... 190 65 120 .510 .59 140 80 107 .453 .49 5,000 90 1,690 7.16 8.26 4,650 805 1,830 7.75 8.65 1,060 235 497 2.11 2.43 Juue...... 1,180 165 324 . 1. 37 1.53 July...... 4,870 187 714 3.03 3.49 715 145 304 1.29 1.49 805 124 296 1.25 1.40 5,000 65 629 2.67 36.26 NOTE. Monthly discharge April to September, 1918, supersedes that published in Water-Supply Paper 471, p. 164. WEST BRANCH OF DELAWARE RIVER AT HALE EDDY, N. Y. LOCATION. At highway bridge in village of Hale Eddy, Delaware County, 8 miles below power dam of Deposit Electric Co. and 8£ miles above junction with East Branch of Delaware River. DRAINAGE AREA. 611 square miles (measured on post route map). RECORDS' AVAILABLE. November 15, 1912, to September 30, 1920. GAGE. Vertical staff, in four sections, attached to rocks near the right abutment of the bridge and to the abutment; read by W. J. Shanly. DISCHARGE MEASUREMENTS. Made from the cable installed in July, 1916, about 400 feet below the gage. Previous measurements made from the highway bridge or by wading. CHANNEL AND CONTROL. Coarse gravel and boulders; practically permanent. DELAWARE RIVEE BASIN". 229 EXTREMES OP DISCHARGE. Maximum stage recorded for year ending September 30, 1919, 7.5 feet at 4 p. m. April 12 (discharge, 5,420 second-feet); minimum stage recorded, 1.50 feet at 4 p. m. July 9 (discharge, 65 second-feet). Maximum stage recorded for year ending September 30,1920,13.0 feet at 4 p. m. March 13 (discharge, 18,100 second-feet); minimum stage recorded, 1.7 feet at 4 p. m. June 11, 12, and July 6 (discharge, 103 second-feet). 1912-1920: Maximum stage 14 recorded, 15.3 feet at 5 p. m. March 27,1913 (dis charge, 25,000 second-feet); minimum stage recorded 1.0 foot at 6 p. m. September 21,1913 (discharge, 34 second-feet), ICE. Stage-discharge relation affected by ice. ACCURACY. Stage-discharge relation practically permanent. Rating curve for the year ending September 30, 1920, has been revised slightly so as to average the current-meter measurements made at the station, and is well defined between 80 and 24,000 second-feet. Gage read to tenths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Open-water records good; records for period of ice effect fair. Discharge measurements of West Branch of Delaware River at Hale Eddy, N. Y., during the years ending Sept. 30, 1919 and 1920, Gage Dis Gage Dis Date. Made by height. charge. Date. Made by- height. charge. 1918. Feet. Sec.-ft. 1919. Feet. Sec.-ft. Oct. 12 3.65 1,010 Nov. 17 Covert and Lauterhahn 3.56 891 .....do...... 4 44 1,550 Dec. 23 o3.90 815 1919. 1920...... do...... o2.94 Ecn .....do...... 04.88 254 J. W. Moulton...... 3.57 855 Feb. 13 .....do...... 04.09 272 2.14 .....do...... 233 Aug. 26 2.08 192 31 .....do...... 7.42 4,890 26 .....do...... 2 f\C 206 B.F.Howe...... 2.02 179 Atie. 4 C.C. Covert...... 2.35 288 o Stage-discharge relation affected by ice. Daily discharge, in second-feet, of West Branch of Delaware River at Hale Eddy, N. Y. , for the years ending Sept. SO, 1919 and 19%Q. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1,040 2,560 455 1,180 690 3,540 1.420 970 480 95 305 170 2...... 870 1,940 410 3,280 632 2,340 1,260 970 432 95 200 250 3...... 1,180 1,940 480 2,790 580 1,760 1,260 970 388 95 215 285 4...... 1,040 1,760 505 2,140 632 1,500 1,940 970 365 85 170 325 5...... 1,110 1,420 432 1,670 720 1,420 1,940 970 325 81 142 480 6...... 4,810 1,110 365 1,420 632 1,580 2,140 970 305 95 365 305 7...... 3,540 1,110 410 1,180 530 1,420 2,240 870 268 95 780 268 8...... 2,140 970 432 900 455 1,260 1,940 900 285 95 455 268 9...... 1,760 970 530 810 432 2,040 1,940 870 268 75 345 250 10...... 1,580 900 530 720 388 3,280 2,140 1,760 250 85 268 200 11...... 1,260 870 432 660 305 2,560 2,140 3.410 170 95 232 170 12...... 1,040 810 605 632 305 1,940 5,260 3,030 118 118 215 200 13...... 1.110 720 530 632 388 1,670 4,080 3,280 118 170 170 170 14...... 970 580 840 780 580 1,420 3,280 2,790 105 142 142 185 15...... 870 505 1,580 900 1,260 1,260 2,560 2,140 200 170 155 170 16...... 690 505 1,670 760 970 1,260 2,140 1,760 200 215 170 155 17...... 632 480 1,260 780 605 1,760 2,790 1,760 250 200 118 170 18...... 605 1,260 1,180 750 530 2,450 2,140 1,760 305 200 118 200 19...... 530 1,180 1,110 690 480 2,140 1,940 1,340 232 200 142 200 20...... 530 1,110 970 660 432 1,940 1,580 1, 110. 232 200 170 200 21...... 505 970 970 632 505 1,760 1,420 1,110 268 250 142 170 22...... 505 970 970 555 432 1,580 1,260 1,040 200 388 365 118 23...... 580 870 2,040 580 455 1,420 1,110 1,340 118 345 ' 388 365 24...... 555 780 1,580 1,940 432 1,260 1,110 1,180 118 305 268 690 25...... , 555 720 2,450 1,580 432 1,110 1,110 118 91 ^ QOE 506 26...... 555 690 2,140 1,420 632 1,110 1 040 1QK 200 250 432 27...... 605 632 1,940 1,260 555 1,110 1,110 r 870 215 690 232 Daily discharge, in second-feet, of West Branch of Delaware River at Hale Eddy, N. Y., for the years ending Sept. SO, 1919 and 1920 Continued. Day. 0/t. Ngv. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 165 3,950 1,880 300 140 220 4,790 1,520 300 380 540 565 2...... 165 3,320 1,520 280 220 180 4,940 1,520 262 280 422 615 3...... 282 2,470 1,360 220 260 180 4,490 1,360 228 280 380 422 4...... 195 1,970 1,070 200 280 400 3,820 1,360 228 262 360 360 5...... 195 2,270 240 240 500 3,200 1,210 228 195 300 340 6...... 245 1,070 300 94rt 2,200 3,320 1,070 252 124 262 320 7...... 245 1,700 1,070 380 240 2,800 2,670 930 238 195 180 340 8...... 245 1,440 1,210 420 220 2,400 2,270 840 245 340 195 340 9...... 180 1,280 1,280 400 220 2,200 2,070 930 195 300 165 360 10...... 210 1,070 1,880 380 240 2,000 1,700 840 137 245 165 422 11...... 262 1,210 1,700 380 240 2,400 1,520 1,070 114 300 468 1,880 12...... 262 1,210 1,360 320 240 4,200 1,520 1,880 114 1,210 1,360 2,770 13...... 280 1,700 1,520 320 240 14,900 1,360 1,520 210 930 1,210 2,670 14.. . . 262 1,360 1,520 280 220 8,680 1,360 1,360 195 722 1,360 2,170 15...... 245 1,210 1,700 280 240 5,580 1,700 1,210 195 590 1,070 1,700 16...... 280 1,070 1,360 260 240 6,030 2,070 1,070 195 515 810 1,280 17...... 722 930 1,210 280 220 6,450 1,700 930 245 400 1,700 930 18...... 615 870 QQn 5,260 1,610 1,000 1,070 280 1,520 930 19...... 722 780 722 300 240 4,080 1,520 930 930 340 1,210 780 20...... 490 780 930 280 240 3,320 1,360 722 750 668 870 695 21...... 445 780 320 280 2,670 1,520 750- 565 490 ni 615 22...... 468 722 800 260 300 2,370 1,360 668 515 468 722 540 23...... 400 668 280 260 3,090 1,520 615 445 1,210 68 468 24...... 360 640 650 260 240 4,790 1,360 565 422 3,820 565 422 25...... 320 615 260 280 6,630 1,360 515 340 2,470 515 380 26...... 280 930 460 220 260 7,010 1,210 5)5 300 1,790 422 380 27...... 300 6,450 440 240 280 10,900 1,210 468 245 1,360 352 360 28...... 565 4,080 380 220 240 6,820 1,210 422 195 1,070 320 668 29...... 930 3,200 200 ORft 6,270 1,790 422 228 930 565 930 30...... 930 2,470 280 160 5,920 1,700 340 540 780 56? 2,270 31...... 1,700 120 5,100 320 615 515 NOTE. Discharge, Dee. 22,1919, to Mar. 12,1920, determined from gage heights corrected for ice effect by means of five discharge measurements, study of gage-height graph and weather records. Monthly discharge of West Branch of Delaware River at Hale Eddy, N. Y.,for the years ending Sept. 30, 1919 and 1920. ' [Drainage area, 611 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 4,810 505 1,170 1.92 2.21 2,560 480 998 1.63 1.82 2,450 365 1,040 1.70 1.96 3,280 555 1,140 1.87 2.16 1,260 305 556 .910 .95 3,540 1,110 1,750 2.86 3.30 April...... 5,260 970 1,910 3.13 3.49 3,410 580 1,390 2.27 2.62 480 105 236 .386 .43 July...... 690 75 213 .349 .40 780 118 246 .403 .46 690 118 274 .448 .50 The year...... 5,260 75 913 1.50 20.30 1919-20. 1,700 165 418 .684 .79 6,450 615 1,770 2.90 3.24 1,880 280 1,040 1.70 1.90 420 120 279 .457 .53 300 140 243 .398 .43 14,900 180 4,370 7.15 8.24 April...... 4,940 1,210 2,110 3.45 3.85 1,880 320 932 1.52 1.75 1.070 114 338 .553 .62 July...... 3,820 124 760 1.24 1.43 1,700 165 661 1.08 1.24 2,770 320 897 1.47 1.64 14.900 114 1,160 1.90 25.72 DELAWARE ItfVER BASIN. WALLENPATTPACK CREEK AT WILSONVILLE, PA: LOCATION. At two-span steel highway bridge, at Wilsonville, 1J miles south of Hawley, Wayne County. DRAINAGE AREA. 239 square miles. RECORDS AVAILABLE. July 3,1908fcto September 30,1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Vertical staff attached to downstream end of pier and a Barrett and Law rence water-stage recorder installed on top downstream end of pier. Elevation of zero of gages, 1,146.78 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Right bank is overflowed at extreme high stages; left is high and not subject to overflow. Bed is composed of rock. Control is at a log weir about 70 feet below gage. EXTREMES OP DISCHARGE. Maximum stage recorded during the year ending Sep tember 30, 1919, 2.87 feet, March 10 (discharge, 1,794 second-feet); minimum stage, 0.70 foot, July 16 (discharge, 61 second-feet). Maximum stage during the year ending September 30, 1920, from water-stage recorder, 4.00 feet at 6 a. m. July 25 (discharge, 3,420 second-feet); minimum, normal flow of stream, from water-stage recorder, 0.78 foot at 6 p. m. October 9, 11 p. m. July 11 and 6 p. m. September 3 and 24 (discharge, 86 second-feet); a stage of 0.60 foot was recorded on September 4 (discharge, 33 second-feet), when dashboards'were placed on the dam above the gage and a portion of the stream flow was temporarily held back. ICE. Stage-discharge relation not usually affected by ice. REGULATION. Flow during low stages regulated, for the operation of silk mills, by use of flashboards on a 3-foot concrete dam about 35 feet above gage. COOPERATION. Records furnished by L. B. Still well and H. S. Putnam, consulting engineers, New York City. Discharge measurements of Wallenpaupack Creek at Wilsonville, Pa., during the years ending Sept. 30, 1919 and 1920. Dis Date. Made by J& charge. 1919. Feet. Sec.-ft. July 14 0.81 83 1920. June 11 H. L. Landls...... 1.14 267 V. 232 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Wallenpaupack Creek at Wilsonville, Pa., for the years ending Sept. SO, 1919 and 1920. ' Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 178 273 150 528 172 826 576 342 282 126 249 120 2...... 150 327 142 COO 1,110 ACf7 ino 288 108 3...... 142 297 148 664 982 483 400 234 Q7 250 104 4...... 146 232 146 727 163 799 508 399 212 83 199 111 5...... 144 190 i/tfl QAQ 1 c\fi 701 V)d. 349 7Q 212 155 6...... 138 174 136 772 146 612 532 272 170 76 224 130 7...... 267 240 128 736 IOQ 475 211 NOTE. Stage-discharge relation not affected by 'ice. On' Sept. 4,1920, flashboards were placed on the dam above the gage and some portion of the stream flow was stored temporarily. DELAWARE RIVER BASIN. 238 Monthly discharge of Wallenpaupack Creek at Wilsonville, Pa., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 239 square miles.] Discharge in second-feet. Run-ofl Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 373 107 168 0.703 0.81 327 109 191 .799 .89 754 106 302 1.26 1.45 808 194 422 1.77 2.04 540 130 248 1.04 1.08 1,746 420 ' 846 3.54 4.08 April...... 1,445 376 688 2.88 3.21 May...... 1.375 242 625 2.62 3.02 318 108 . 203 .849 .96 July...... 1,456 61 351 1.47 . 1.70 516 122 225 .941 1.08 401 87 167 .699 .78 The year .^ ...... 1,746 61 371 1.55 21.09 1919-20. 330 85 161 .673 .78 November ...... 1,483 294 627 2.62 2.93 1.150 172 614 2.57 2.96 219 130 169 .707 .82 180 130 156 .653 .71 2,910 163 1,657 6.93 7.99 April...... 1,460 489 800 3.35 3.73 May...... 889 336 503 2.10 2.43 898 266 506 2.12 2.38 July...... 3,223 94 496 2.08 2:39 377 102 201 .841 .97 885 47 205 .858 .96 3,223 47 510 2.13 29.03 LEHIGH RIVER AT TANNERY, PA. LOCATION. At single-span steel highway bridge at Tannery, Carbon County. DRAINAGE AREA. 335 square miles. RECORDS AVAILABLE. June 23, 1914, to September 30, 1920. Records prior to October 1, 1919, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain attached to downstream side of bridge; read by G. D. Heimbaeh. Elevation of zero of gage 1,029.41 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Banks are high and not subject to overflow. Bed is composed of gravel and large stones. Control is at a riffle about 300 feet below gage; probably permanent. EXTREMES OF DISCHARGE. Maximum open-water stage during the year ending September 30, 1920, 8.10 feet at 4 p. m. March 12 (discharge, 6,930 second-feet); a stage of 8.70 feet was observed at 4 p. m. March 6, but the water was held back by an ice jam; minimum stage 2.85 feet at 4 p. m. September 26 (discharge, 152 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year, except as affected by ice January 3 to March 10, 1920. Rating curve fairly well defined between 150 and 3,000 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records fair. 234 SURFACE WATER SUPPLY, 1919-1920, PART I. Discharge measurements ofLehigh River at Tannery, Pa., during the year ending Sept. 30, 1920. Gage Dis Date. Made by height. charge. Feet. Sec.-ft. Jan. la 5.47 289 Feb. 5a .....do...... 4.23 244 .....do...... 3.50 236 May 15 H. L. Landis...... : ...... 4.08 721 a Measurement made through incomplete ice cover. Daily discharge, in second-feet, of Lehigh River at Tannery, Pa., for the year ending Sept. 30, 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 201 1,OQO 1,830 545 160 360 2,900 1,180 295 274 515 219 2...... 213 1.490 1,380 405 160 300 2,900 1,180 281 270 405 207 3...... 225 1.380 1,180 340 160 240 2,900 1,180 303 288 344 195 4...... 219 1,180 870 280 160 260 2,750 1,040 303 288 303 183 5...... 189 1,830 750 280 220 700 2,900 1,000 680 295 267 183 6...... 232 1,710 750 280 260 4,600 2,900 830 910 274 253 207 7...... 219 1,380 830 300 280 3,600 2,470 790 715 260 246 380 8...... 219 1,180 910 500 300 2,600 1,950 790 515 264 253 267 9...... 222 1,000 1,280 600 340 2,000 1,600 750 485 256 250 267 10...... 219 870 1 600 550 340 2,000 1,490 715 457 232 228 344 11...... 213 830 1.280 480 360 4,230 1,380 680 430 213 260 380 12...... 288 870 1,090 380 380 6,700 1,180 715 371 335 232 430 is...... :... 295 1,380 1,280 340 440 5,190 1,710 870 515 405 222 405 H...... :... 299 1,380 2,070 320 480 4,990 1,600 870 645 295 232 344 15...... 331 1,180 1,600 300 600 4 230 1,380 790 515 292 288 281 16...... 610 1,040 1,380 300 600 3,700 1,380 715 457 319 311 253 17...... 750 910 1,180 340 550 4,990 2,200 645 545 288 340 232 18...... 578 830 870 380 500 4 230 2,200 545 1,490 232 910 201 is...... :... 485 750 1,040 380 480 3^870 1,830 485 1,380 327 1,090 177 20...... 430 645 1,000 340 460 3,370 1,830 515 1,000 371 830 204 21...... 371 578 1,000 300 440 2,900 1,710 680 750 344 610 195 22...... 344 545 910 280 400 1,600 1,000 680 340 371 183 23...... 315 545 910 280 400 2,750 1,600 790 578 750 327 171 24...... 430 515 790 260 400 3,210 1,380 715 457 1,180 299 183 25...... 405 485 610 260 400 4,790 1,180 545 405 1,380 267 183 26...... 380 1,000 578 260 400 5,390 1,180 515 371 1,000 260 154 27...... 430 3,530 610 200 340 5,390 1,180 485 335 680 253 180 28...... 405 2,610 545 180 240 4,410 1,280 430 319 485 228 344 29...... 405 2,330 405 160 240 4,230 1,180 371 288 430 219 430 30...... 430 2,070 485 160 3,870 1,180 335 267 362 267 750 31...... 680 578 160 2,900 311 327 253 NOTE. Discharge Jan. 3 to Mar. 10-estknated, because of ice, from discharge measurements, weather records, and study of gage-height graph. Monthly discharge of Lehigh River at Tannery, Pa., for the year ending Sept. 30, 1920. [Drainage area, 335 square miles.] Discharge in second-feet. Run-oft Month. Per in inches. Maximum. Minimum. Mean. square mile. 750 189 356 1.06 1.22 3,530 485 1,240 3.70 4.13 2,070 405 1,020 3.04 3.50 600 160 327 .976 1.13 600 160 362 1.08 1.16 March...... 6,700 240 3,370 10.06 11.60 April...... 2,900 1,180 1,830 5.46 6.09 May...... 1,180 311 725 2.16 2.49 June...... 1,490 267 558 1.67 1.86 July...... 1,380 213 421 1.26 1.45 1,090 219 359 1.07 1.23 September...... 750 154 271 .809 .90 6,700 154 906 2.70 36.72 DELAWARE RIVER BASIN. 235 LEHIGH RIVER AT BETHLEHEM, PA. LOCATION. At nine-span steel highway bridge, three of which are over the normal river channel at New Street, Bethlehem, Northampton County. DRAINAGE AREA. 1,240 square miles. RECORDS AVAILABLE. September 22, 1902, to February 13, 1905, and April 26, 1909, to September 30, 1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain attached to downstream side of bridge; read by William E. Roberts. Elevation of-zero of-gage 210.64-feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Right bank is high and not subject to overflow; left is low and subject to overflow at high stages. Bed is composed of sand and gravel. Control is at a riffle about 1.000 feet below gage; shifts occasionally. Monocacy Creek enters from left just below the low-water control. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Sep tember 30, 1919, 8.23 feet at 7 a. m. March 10 (discharge, 14,400 second-feet); minimum stage, 1.76 feet at 7 a. m. November 17 (discharge, 448 second-feet). Maximum stage recorded during the year ending September 30, 1920, esti mated from hydrograph, 12.0 feet at 8 p. m. March 5 (discharge, 25,800 second- feet) ; minimum stage, 1.72 feet at 4.30 p. m. July 11 (discharge, 416 second-feet) < ICE. Stage-discharge relation seldom affected by ice. DIVERSIONS. During navigation season water is diverted past the gage through the Lehigh Coal & Navigation Co.'s canal, which follows the left bank and pasee& under the left span of the bridge. ACCURACY. Stage-discharge relation permanent throughout the year, except as affected by ice for short periods in January, February, and March. Rating curve fairly well defined between 300 and 31,000 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good for medium and high stages; fair for low stages owing to uncertain amount of water diverted by canal. Discharge measurements of Lehigh River at Bethlehem, Pa., during the years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by- height. charge. Date. Made by height. charge. 1919. Feet.. Sec.-ft. 1920. Feet. 8ec*-ft. July 12 2.42 01,100 Feb. 3 2.17 814 Mar. 1 .....do...... 1.97 661 1920. 19 .....do...... 6.36 9,300. Jan. 56 2.36 942 2.73 c 1,500 » Flow in Lehigh canal 64 second-feet additional. 6 Measurement made through incomplete ice cover. c Flow in Lehigh canal 304 second-feet additional. 236 SURFACE WATER SUPPLY, 1919-1920, PART I. ' Daily discharge, in second-feet, of Lehigh River at Bethlehem, Pa., for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 600 1,240 1,060 3,090 1,920 4.040 4,040 2,230 1,920 2,230 2,570 770 2...... 660 995 938 5,280 1,370 7,210 3,640 3,450 1,770 1,840 2,230 825 3...... 620 880 938 5,730 1,560 5,500 3,450 4,040 1,630 1,770 1,920 995 4...... 650 770 880 4,850 1,770 4,440 3,270 2,230 1,560 1,500 1,840 995 5...... 660 770 770 3,640 1,700 3,840 3,640 2,070 1,440 1,300 1,770 880 6...... 640 880 770 3,450 1,560 3,450 3,450 2.070 1,630 1,180 1,920 770 7...... 825 880 770 2,910 1,500 3,270 2,910 2,910 2,400 1,120 2,740 770 8...... 1,060 770 720 2,910 1,440 2,910 2 740 3,450 1,920 1,060 2,400 720 9...... 880 670 670 2,740 1,370 6,210 2,570 3,090 1,920 1,060 1,700 678 10...... 770 610 720 1,840 1,300 13,300 2,570 3,640 1,630 995 1,630 720 11...... 770 590 825 1 990 1,300 8,830 2,570 4,240 1,560 1,180 1,560 825 12...... 720 570 1,120 1,560 1,370 6,450 4 040 3,840 1,500 1,120 1,560 1,240 13...... 720 534 1,370 1,920 1,370 5,060 3,840 3,450 1,440 1,060 1,500 1,180 14...... 670 489 1,770 2,070 1,560 4,440 3,270 3,090 1 300 1,060 1,500 825 15...... 600 516 2,910 2,230 2,740 4,040 3,090 3,090 1,240 995 1,440 770 16...... 570 480 2,910 1,920 2.570 3,840 3,270 2,910 1,700 995 1,440 770 17...... 590 456 2,910 1,840 1,920 4,240 5,970 3,090 1,560 1,060 1,440 720 18...... 570 1,630 2,400 1,920 1,770 4,240 5,280 3,840 1,500 1,060 1,440 650 19...... 498 2,400 2,070 2,070 1 370 4,640 4,640 2,910 1,440 1,300 2,070 660 20...... 472 1,700 1,840 2,070 938 4,240 4,040 2,570 1,300 2,070 1,840 720 21...... 552 1,440 1,700 1,840 1,440 3.840 3,840 2,570 1,370 9,390 1,770 670 22...... 670 1,240 1,920 1 700 1,440 3,640 3 450 2,910 1,300 10,500 1,630 620 23...... 670 1,120 6,450 2,230 1,560 3.270 3,090 3,270 1,120 8,550 1,500 620 24.... . 600 995 5,280 4,440 1,840 2,910 3,090 4,640 1,060 6,210 1,440 770 25...... 561 938 6,210 4^240 1^770 2,740 2,910 4,040 995 4,640 1,370 720 26...... 516 995 5,730 3,640 2,910 2,570 2.740 3,640 995 3,640 1,240 630 27...... 480 880 5,500 3,270 2,570 3.090 2,570 3,270 4,440 3,270 1,120 28...... 534 770 3,840 2,910 2,230 8,550 2,400 3,270 5,280 2,910 995 570 29...... 489 938 3,270 2,570 5,500 2,230 2,740 3.450 2 740 938 561 so:...... 489 1,240 2,910 2,400 4,850 2,070 2,230 2,400 2,570 825 552 31...... 600 2,570 2,230 4,440 2,070 2,570 770 1919-20. 1...... 720 2,070 4,440 1,400 850 600 6,210 2,740 938 770 1,240 770 2...... 720 2,910 4,040 1,300 850 650 6,450 2,740 1,050 825 1,440 570 3...... 670 3,090 3,640 1,100 750 750 6,700 2,230 880 880 1,050 525 4...... 670 2,910 3,090 1,000 880 1,770 6,700 2,230 880 825 770 525 5...... 670 4,850 2 Q1A onn 995 15,300 7,210 2,070 1,120 825 825 498 6...... 720 4,640 2,740 onn 1,240 7,470 2,070 995 720 880 770 7..... 670 3,840 3,090 1,100 1 37fl 6,210 6,500 2,070 1,700 670 880 2,230 8...... 670 3,270 3,270 1 600 1,180 4,850 4,800 2,070 1,560 516 825 1,240 9...... 670 2,910 3,640 2,400 4,640 4,000 2,070 1,370 640 825 1,120 10...... 670 2,740 5,280 2,070 1,050 6,700 3 QJA 1,700 1,120 464 825 1,500 11...... 720 2,570 5,060 1,700 938 8,550 3,450 1,920 938 432 938 1 fi^lA 12...... 995 3,090 1,560 880 11,600 3 non 2,070 770 552 938 1,370 13...... 995 4,640 1,440 880 18,500 3,270 1,920 995 1,240 938 1,370 14... 1,120 5,060 4,640 1,240 800 14,200 3,640 1,920 1,560 1,180 995 i 3nn 15...... 1,240 4,440 1,120 son 3 4.cn 1,920 1,440 1,120 l(050 995 16...... 2,230 3,640 3,640 QQe 750 19 fifift 3 *V7ft 1,700 1,240 1,240 1,120 Qon 17...... 3,090 3,270 2,570 880 7V\ 15,600 4 040 1,700 1,240 825 1,180 OOK. 18...... 1,920 3,090 938 750 11,400 5*060 1,500 2,070 1,500 1,500 770 19...... 1,920 2,400 2 oqrt QQE 9,670 4 440 2 4fifi 1,240 2,230 580 20...... 1,840 2,400 2,570 One itjn 7,470 1,440 2' 230 1,050 1,770 770 21...... 1,700 2,400 2 74ft QQC 700 6,700 S fifift 1,630 1,920 770 1,440 770 22...... 1,560 2,230 2,740 QQt 700 6 QRft 4.240 2,070 1,630 938 1 180 720 23...... 1,500 2,070 2,570 995 7,470 3 640 2,070 1 fWI 3,270 1 240 770 24...... 1,060 2,070 2,400 QQC 670 7,730 - Q' 4*\n 1,700 2,400 938 770 25...... 938 1,920 QOO cen 9,670 3,090 1,630 1,120 2,400 770 UTO 26...... 1,060 2,910 1,770 QOD «ert 9 Q£fi 2 740 1 Wl 1 '938050 2,070 770 498 27...... 1,180 6,450 2 230 QOO 600 9 950 2*740 1 AAf\ 1,630 770 oat 28...... 1,770 5,970 l'920 938 600 S OQft 2 910 1 240 QOA 1 440 1,050 29...... 1,500 4,850 1,700 950 fi/m 7,470 2' 740 1*120 OOC 1,'370 770 1 *JM\ 30...... 1,560 5,280 1,700 900 6,700 2,740 one 770 i snn 880 2 e.7A 31...... 1,560 1,630 900 6,450 938 1,120 880 NOTE. Discharge does not include water diverted past the gage by Lehigh Coal & Navigation Co.'scanal. Canal closed Nov. 30,1918, to Mar. 21,1919; Nov. 22,1919, to Apr. 14,1920. In previous years flow of the canal has been estimated at 45 second-feet. Discharge Dec. 51919, Jan. 13-24,1920, Feb. 4-5 and Apr. 7-9, 1920, estimated because of unsatisfactory gage-height record. Discharge Jan. 1-8,1920, Jan. 28 to Feb. 3, Feb. 14-22, and Feb. 25 to Mar. 3, 1920, estimated because of ice, from discharge measurements, weather records, and study of gage-height graph. DELAWARE EIVER BASIN. 237 Monthly discharge of Lehigh River at Bethlehem, Pa., for the years ending Sept. 30, 1919 and 1920. [Drainage area, 1,240 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 1,060 472 636 0.513 0.59 N ovember...... , 2,400 456 946 .763 .85 6,450 670 2,380 1.92 2.21 5,730 1,560 2,820 2.27 2.62 February...... 2,910 938 1,720 1.39 1.45 13,300 2,570 4,820 3.89 4.48 5,970 2,070 3,360 2.71 3.02 May...... 4,640 2,070 3,120 2.52 2.90 5,280 995 1,830 1.48 1.65 July...... 10.500 995 2.680 2.16 2.49 2,740 770 1.620 1.31 1.51 1,240 552 760 .613 .69 The year...... 13,300 456 2,230 1.80 24.46 1919-20. 3,090 670 1,240 1.00 1.15 6, 450 1,920 3,470 2.81 3.14 5,280 1,630 3,090 2.49 2.87 January ...... 2,400 880 1,160 .935 1.08 February...... 1,370 600 836 .674 .73 March...... 18,500 600 8,450 6.80 7.84 7,470 2,740 4,370 3.52 3.93 2,740 938 1,SOO 1.45 1.67 2,400 770 1,290 1.04 1.16 July...... 3,270 432 1,170 .944 1.09 2,230 770 1,050 .847 .98 2,570 498 1,020 .823 .92 18,500 432 2,420 1.95 26.56 NOTE. Eischargc does not in lude the water diverted past the gage through the Lehigh Coal & Navi gation Co.'s canal. See footnote to daily-discharge table. LITTLE SCHTTYLE3LL RIVER AT TAMAQTTA, PA. LOCATION. At Broad . Street three-span stone-arch highway bridge, Tamaqua, Schuylkill County. DRAINAGE AREA. 44 square miles. RECORDS AVAILABLE. June 23, 1916, to September 30, 1920. Records prior to October 1, 1919, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to upstream side of bridge; read by W. P. Griffiths. DISCHARGE MEASUREMENTS. Made from upstream side of bridge or by wading. CHANNEL AND CONTROL. Section is entirely walled in above and below theT>ridge. Banks subject to overflow only during extreme floods. Bed is composed of gravel and rocks. Low-water control is a gravel bar extending diagonally across the channel at downstream side of bridge. Stage-discharge relation not permanent, owing to changes in the gravel bar and lodging of debris and waste on the control. EXTREMES OP DISCHARGE. Maximum stage recorded during the year ending Sep tember 30, 1920, 4.00 feet March 13 (discharge, 1,020 second-feet); minimum stage, 1.85 feet October 9 (discharge, 5 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year, except as affected by ice January 3 to March 6, 1920. Rating curve fairly well defined between 50 and 300 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Rec ords good, except for extreme stages, which are fair. 238 SURFACE WATER SUPPLY, 1919-1920, PART I. Discharge measurements of Little Schuylkill River at Tamaqua, Pa., during the year end- ing Sept. 30, 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by- height. charge. Feet. Sec.-ft. Feet. Sec,-ft. 2.35 105 Mar. 4c 9 7/1 42.0 2 27 51.4 May27<* 2.10 41.4 Feb. 6« .....do...... 3.19 38.9 a Measurement made from downstream side of bridge. * Measurement made through complete ice cover at Cedar Street bridge, c Measurement made through complete ice cover 300 feet below gage. <* Measurement made by wading 50 feet above gage. Daily discharge, in second-feet, of Little Schuylkill River at Tamaqua, Pa., for the year ending Sept. SO, 1920. , Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 30 109 162 46 30 40 325 91 36 15 56 22 2...... 18 115 162 38 30 40 350 85 30 15 30 16 3...... 10 103 145 30 30 40 121 60 40 62 20 16 4...... 8 100 145 20 40 40 145 62 42 48 18 15 5...... 18 180 127 20 40 460 350 65 85 26 18 14 6...... 15 180 124 30 40 850 220 65 82 14 18 40 7...... 10 180 124 40 40 460 200 60 40 15 18 50 8...... 7 145 115 ' 50 40 260 200 60 38 19 15 20 9...... 5 130 300 70 40 200 200 60 36 14 15 19 10...... 12 115 260 85 30 220 180 56 36 14 14 91 11...... 14 115 180 60 30 162 145 60 30 20 14 50 12...... 20 180 162 50 30 755 145 60 30 109 14 40 13...... 14 300 200 40 30 1.020 240 85 38 44 18 30 14...... 24 240 200 40 40 685 280 72 30 36 32 20 15...... 54 180 200 30 40 430 240 72 30 44 36 20 16...... 70 145 200 20 40 685 260 60 30 30 28 20 17...... 54 145 180 20 40 720 325 56 60 20 180 20 18...... 42 145 180 20 40 650 260 56 65 22 100 14 19...... 44 121 220 30 40 615 220 50 40 22 80 8 20...... 50 115 240 30 40 430 220 56 40 18 56 8 21...... 46 100 145 30 40 850 220 60 40 14 40 8 22...... 44 100 30 40 300 180 60 40 14 dn 8 23...... 48 100 85 30 40 430 162 60 36 145 36 8 24...... 65 85 72 30 40 520 145 50 30 100 30 & 25...... 48 72 62 30 40 460 145 48 20 52 24 8 26...... 50 220 52 30 40 430 112 44 20 24 20 30 27...... 91 220 44 30 40 400 115 40 14 24 20 24 28...... 133 220 48 30 40 325 115 40 14 24 24 136 29...... 85 220 56 30 40 260 88 38 15 20 38 100 30...... 85 220 78 30 240 85 38 16 20 28 650 31...... 85 58 30 OOA 36 9rt 24 NOTE. Discharge Jan. 3 to Mar. 6 estimated, because of ice, from discharge measurements, weather rec ords, and study of gage-height graph. DELAWARE RIVER BASIN. 239 Monthly discharge of Little Schuylkill River at Tamaqua, Pa., for the year ending Sept. SO, 1920. [Drainage area, 44 square miles.] Discharge in second-feet. Run-off Month, Per in inches. Maximum. Minimum. Mean. square mile. 133 5 41.9 0.952 1.10 300 72 153 3.48 3.83 300 44 143 3.25 3. 75 85 20 35.5 .807 .93 40 30 37.6 .855 .92 1,020 40 410 9.32 10.74 April...... 350 85 200 4.55 5.08 91 36 . 58.2 1.32 *1.52 85 14 36.8 .836 .93 July...... 145 14 34.3 .780 .90 180 14 35.6 .809 .93 650 8 50.4 1.15 1.28 1,020 5 103 2.34 31.96 SCHTJYLKILL RIVER. AT READING, PA. LOCATION. At concrete viaduct at Perm Street, Reading, Berks County. DRAINAGE AREA. 900 square miles. RECORDS AVAILABLE. May 6,1914, to September 30,1920. Records prior to October 1, 1919, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by H. J. Kline. Elevation of zero of gage 188.50 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Right bank is high and not subject to overflow; left is low, and stream begins to overflow the canal tow-path at a stage of 6.8 feet. Bed is composed of gravel. Low-water control is at a slight riffle about 700 feet below gage; may shift occasionally. Control for high stage is probably at the Pennsyl vania Railroad bridge about 900 feet below gage; probably permanent. EXTREMES OP DISCHARGE. Maximum open-water stage during the year ending September 30,1920, estimated from hydrograph, 11.6 feet at 3.30 p. m., March 12 (discharge, about 25,000 second-feet); a stage of 18.2 feet, determined from levels, was reached at 2 a. m., March 6, but the water was held back by an ice jam; mini mum: stage determined from hydrograph, 1.0 foot at 10 a. m., September 24 (discharge, 150 second-feet). ICE. Stage-discharge relation usually affected by ice. DIVERSIONS. During navigation season water, is diverted past the gage through the Schuylkill Navigation Co.'s canal, which follows along the left bank. ACCURACY Stage discharge-relation permanent throughout the year except as affected by ice for short periods in December, January, February, and March. Rating curve fairly Well defined below 15,000 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good, except for low stages, which are only fair, owing to uncertain quantity of water diverted by canal. Discharge measurements of Schuylkill River at Reading, Pa., during the year ending Sept. 30, 1920. Gage Dis Gage Dis- , Date. Made by height. charge. Date. Made by height. charge. f Feel. Sec.-ft. Feet. Sec.-ft. 0.43 768 May 6 R. A. Boehringer...... 0.83 1,050 Feb. 2 oon R. J. Ferris...... -.39 365 6 .....do...... -.01 488 176 H. L. Landis...... -.01 531 Mar. 4 .....do...... 1.53 1580 a Discharge in canal, 58 sec.^ft. 6 Discharge in canal, 35 sec.-ft.' 240 SURFACE WATER SUPPLY, 191&-1920, PART I. Daily discharge, in second-feet, of Schuylkill River at Reading, Pa., for the year ending Sept. SO, 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June July Aug. Sept. 1...... 330 1,180 2,760 950 320 660 1,920 1,590 605 390 1,260 430 2...... 330 1,690 2,180 750 320 720 2,610 1,340 630 350 630 390 3...... 505 1,500 1,920 480 320 1,030 3,070 1,260 530 690 480 330 4...... 390 1,260 1,500 480 3W 1,590 2,320 1,100 530 580 430 310 5...... 350 3,800 1,500 500 380 6,000 2,910 1,100 720 530 370 310 6...... 370 2,760 1,500 600 400 15,000 3,800 1,020 810 390 310 430 7...... 390 2,320 1,690 650 460 6,500 3,420 1,020 780 350 1,020 1,590 8...... 350 1,920 1,800 750 500 4,200 2,910 1,020 580 630 660 880 9...... 330 1,590 2,610 1,420 550 2,910 2,460 1,020 530 430 555 630 10...... 310 1,340 4,620 2,320 600 3,240 2,180 1,020 530 390 455 950 11...... 390 1,340 3,800 1,260 700 7,430 1,920 950 350 410 580 950 12...... 480 1,800 '3,420 QV1 690 12,200 1,690 1,020 430 390 605 750 13...... 530 5,460 3,070 1,020 750 18,800 2,460 950 555 430 505 690 14...... 505 5,460 4,410 780 750 11,500 2,180 1,020 555 480 530 605 15...... 1,500 4,000 3,240 580 Q£ft 6,320 1,920 1,180 455 605 480 530 16...... 1,020 2,910 2,040 Q£ft 6,320 1,800 880 455 580 950 580 17...... 1,920 2,460 2,610 480 810 11,200 3,070 880 455 505 750 605 18...... 1,340 2,180 2,610 420 780 7,890 2,910 880 1,590 480 810 580 19...... 1,020 1,690 1,690 400 880 6,760 2,610 530 780 750 810 430 20...... 950 1,500 1,600 880 5,040 2,460 505 605 480 690 410 21...... 810 1,340 1,500 400 750 4,000 2,760 810 580 410 660 390 22...... 750 1,260 1,400 400 750 4,620 2,460 1,340 660 390 605 480 23...... 750 1,180 1,300 400 950 4,410 2,180 880 555 1,180 605 410 24...... 810 1,180 1,300 400 880 4,620 1,920 660 530 750 505 330 25...... 880 1,020 1,200 400 810 4,620 1,690 880 530 580 480 350 25...... 690 1,800 1,180 400 780 4,200 1,590 750 455 480 430 410 27...... 660 3,800 1,180 400 780 4,200 1,500 750 430 410 410 430 28...... 1,420 3,240 1,1 SO 420 810 3,420 1,590 480 410 370 390 530 29...... 1,340 2,910 1,100 420 690 3,070 1,500 390 370 430 880 30...... 1,180 4,620 1,020 400 2,610 1,260 580 410 350 505 950 31...... 1,020 950 380 2,180 605 430 530 NOTE. Discharge docs not include the water diverted past the gage through the Pchuylkill Navigation Co.'s canal. Canal was closed Dec. 4 to June 15. Discharge Dec. 20-25, Jan. 5-7, Jan. 16 to Feb. 11 and Mar. 5-7 estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. Monthly discharge of Schuylkill River at Reading, Pa., for the year ending Sept. 30, 1920. [Drainage area, 900 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1,920 310 762 0.847 0.98 5,460 1,020 2,350 2.61 2.91 4,620 950 2.060 2.29 2.64 2,320 380 650 .722 .83 February...... 950 320 674 .749 .81 18,800 660 5,720 6.36 7.33 3,800 1,260 2,300 2.56 2.86 May...... 1,590 480 922 1.02 1.18 1,590 350 581 .645 .72 July...... 1,180 350 502 .558 .64 1,260 310 . 595 .661 .76 1,590 310 5S5 .650 .72 18,800 310 1,480 1.64 22.38 NOTE. Discharge does not include the water diverted past the gage through Schuylkill Navigation Co.'s canal. Canal was closed Dec. 4 to June 15. BASIN. 241 BRANDYWINE CREEK AT CHADDS FORD, PA. LOCATION. At two-span steel bridge -of Pennsylvania Railroad at Chadds Ford, Delaware County. DRAINAGE ABBA. 285 square miles. RECORDS AVAILABLE. August 1, 1911, to September 30, 1920. Records prior to October 1,1918, are contained in the annual reports of the Water Supply Commis sion of Pennsylvania. GAGE. Chain gage attached to upstream side of bridge; read by H. W. Guest. Ele vation of zero of gage 150.18, United States Geological Survey datum. The San- born water-stage recorder, installed on the upstream end of pier to same datum as the chain gage, was damaged by ice and the record discontinued on March .21, 1920. On July 15 and 16 the water-stage recorder was repaired and the record resumed on July 23. DISCHARGE MEASUREMENTS. Made from upstream side of bridge. CHANNEL AND CONTROL. The right bank is low and the stream begins to overflow a flat 700 feet wide at a stage of about 6 feet^ Left bank is high and not subject to overflow. Bed is composed of mud, gravel, and stones. Control is at the first of a series of low riffles, where the bed is composed of gravel, extending downstream from about 150 feet below gage; practically permanent. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Septem ber 30,1919,10.25 feet at 2 p. m. July 22 (discharge, 10,500 second-feet); minimum stage 0.38 foot at 6.15 p. m. November 15 (discharge, 62 second-feet). Maximum stage during the year ending September 30, 1920, determined from levels, 15.0 feet at 8 p. m. March 5, discharge not determined; minimum stage from water-stage recorder, 0.7 foot at 5.30 p. m. January 14 (discharge, 73 second-feet). ICE. Stage-discharge relation usually affected by ice. REGULATION. Fluctuations in stage during low water are caused by the operation of a mill above the station. ACCURACY. Stage-discharge relation changed at high water in March, 1920, and during short periods of ice effect. Rating curves used before and after March 5, 1920, well defined from 100 to 2,000 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating . table. Records good for medium stages. Discharge measurements of Brandywine Creek at Chadds Ford, Pa., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by- height. charge. Date. Made by height. charge. 1919. Feet. See.-ft. 1920. Feet. Sec.-ft. July 15 1.77 388 Mar. 5 9.37 8,890 May 5 .....do...... 1.80 332 1920. July 13 1.48 273 Feb. 7 a 1.70 333 o Measurement made through incomplete ice cover. 102721 23 WSP 501 16 242 SURFACE WATER SUPPLY, 193.9-1920, PART I. Daily discharge, in second-feet, of Brandywme Creek at Chadds Ford, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Tan. Feb. Mar. Apr. May. Tone. July. Aug. Sept, 1918-19. 1...... 109 123 103 234 174 1,110 835. 335 218 203 512 372 2...... 109 109 105 821 148 512 335 640 234 188 470 335 3...... 100 96 109 1,980 160 372 317 353 234 174 430 335 4...... 100 109 109 640 160 317 335 300 266 160 430 353 5...... 103 103 98 266 203 335 335 317 234 160 450 353 6...... 95 106 103 266 174 410 353 391 234 160 512 335 7...... 135 100 OS 218 148 317 317 335 353 174 470 317 «...... 104 103 $0 234 160 283 283 353 250 160 430 335 9...... 108 90 109 218 148 1,800 300 353 266 143 391 317 10...... 98 95 106 160 148 1,160 283 821 234 174 353 335 11...... 109 88 109 188 148 597 283 730 234 218 353 410 12...... 88 108 410 203 160 450 1,010 470 218 188 353 450 13...... 88 103 203 148 160 410 470 430 250 266 430 353 14...... 88 108 14fi 160 640 391 353 372 218 188 2,110 317 15...... 85 89 730 174 1,060 372 335 353 203 283 597 283 16...... 95 92 317 174 450 470 372 335 266 430 554 283 17...... 90 102 174 174 283 554 1,010 430 234 372 685 317 18...... 104 353 135 188 250 554 1,010 554 234 1,010 1,580 300 19...... 98 188 148 IfiS 218 450 430 353 203 2,170 915 250 20...... 88 127 190 188 203 391 372 317 188, 2,810 1,010 283 21...... 115 108 131 174 218 335 372 470 283 3,420 640 266 22...... 121 100 174 218 300 317 470 203 4,930 512 250 23...... 108 103 1,160 174 512 300 335 430 174 1,860 470 685 24...... 109 Qt 335 1,210 372 300 372 391 188 1,210 430 512 26...... 103 Qi! 685 391 266 283 372 353 174 915 430 353 26...... 98 94 730 266 554 300 300 317 218 775 410 283 27...... 93 95 218 266 353 470 300 300 775 685 391 250 28...... 109 98 188 218 266 1,530 317 . 266 554 640 391 266 29...... 109 129 148 218 512 300 234 266 597 372 250 30...... 108 no 148 203 391 266 234 218 512 372 250 11 109 148 -100 372 234 512 391 1919-20. 1...... 250 266 353 283 218 234 459 1,060 287 200 184 207 2...... 283 821 250 283 250 391 727 588 287 200 241 203 3...... 283 391 250 260 597 1,370 1,160 500 269 774 197 187 4...... 266 283 234 200 1,110 2,100 1,160 480 269 439 184 174 5...... 266 730 234 190 234 12,300 1,210 439 269 361 184 174 6...... 266 450 250 190 110 3,870 1,060 439 287 305 255 174 7...... 283 317 554 234 340 868 915 439 305 305 342 269 8...... 218 283 470 283 320 657 868 439 269 400 287 217 9...... 234 283 730 2,300 300 611 459 439 266 342 217 248 10...... 250 300 1,420, 775 300 1,210 439 439 241 305 241 238 11...... 250 300 597 391 320 2,240 439 439 234 269 459 231 12...... 283 512 470 300 372 2,510 439 439 380 269 305 227 13...... 470 1,110 597 250 685 4 270 459 480 380 252 727 214 14...... 391 640 730 174 1,110 1,690 634 459 361 262 342 197 15. 4 ...... 391 410 512 150 i Qsn 962 459 459 324 269 262 181 16...... 335 372 234 150 512 1,310 439 419 774 269 361 171 n...... 77= 353 200 140 512 1,980 439 419 542 266 241 165 18...... 335 353 190 140 821 1,010 480 380 . 439 209 305 1M 19...... 283 317 ion 14A 1,210 774 459 380 962 342 287 154 20...... 218 317 190 150 512 727 439 342 727 255 287 156 21...... 218 283 200 160 410 727 542 324 542 234 305 151 22...... 250 283 220 190 4an 680 634 324 361 200 342 154 23...... 317 283 240 240 640 611 500 324 305 439 727 151 24...... 410 300 220 821 915 634 480 DOJ 269 241 680 142 25...... 353 300 220 730 685 611 480 324 241 227 439 174 Z6...... 283 353 220 353 300 565 459 324 234 194 542 -168 27...... 266 470 240 353 335 542 439 324 231 168 588 194 28...... 250 317 240 470 335 500 480 324 207 168 419 184 29...... 250 317 230 353 300 480 439 305 207 168 324 207 SO...... 250 512 250 372 480 521 287 200 168 241 611 SI...... 250 266 300 439 287 168 227 NOTE. Discharge Dec. 17-29, 1919, Jan. 3-6, 15-23, and Feb. 6-11,1920, estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. SUSQUBHANNA BIVEB BASIN. Monthly discharge of Brandywine Creek at Chadds Ford, Pa., for the years ending Sept. SO) 1919 and 1920. [Drainage area, 285 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 135 85 102 0.361 0.42 353 89 114 .400 .45 December...... 1,160 80 243 .853 .98 1,980 148 332 1.16 1.34 February ...... 1.060 148 284 .996 1.04 1,800 283 527 1.85 2.13 April...... 1.010 266 403 1.41 1.57 May...... 821 234 395 1.39 1.60 775 174 261 .916 1.02 July...... 4,930 148 829 2.91 3.36 2,110 353 576 2.02 2.33 September...... 685 250 333 1.17 1.3t The year...... 4,930 80 368 1.29 17.5* 1919-20. October...... 775 218 304 1.07 1.23 November...... 1,110 266 408 1.43 1.60 December...... 1,420 190 362 1.27 1.46 2,300 140 365 1.28 1.48 February...... 1,980 110 557 1.95 2.10 12,300 234 1,530 5.36 6.18 April...... 1,210 439 604 2.12 2.36 May...... 1,060 287 418 1.47 1.70 962 200 356 1.25 1.40 July...... 774 168 282 .989 1.14 727 184 347 1.22 1.41 September...... 611 142 203 .712 .79 12,300 110 478 1.68 22.85 STTSQTTEHANNA BIVEB- BASIN. STJSQTJEHANNA RIVEE AT CONKLIN, N. Y. LOCATION. At steel highway bridge just below Conklin, Broome County, 5 miles below Big Snake Creek and 8 miles above Chenango River. DRAINAGE AREA. 2,350 square miles. RECORDS AVAILABLE. November 13, 1912, to September 30, 1920. GAGE. Stevens continuous water-stage recorder on left bank just below highway bridge, used since October 4,1914, except January 21,1919, to May 29,1920, when a Gurley 7-day graph water-stage recorder was used. DISCHARGE MEASUREMENTS. Made from the bridge or by wading. CHANNEL AND CONTROL. Coarse gravel and boulders; probably permanent. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder for year end ing September 30, 1919, 10.65 feet at 3 p. m. October 31 (discharge, 17,900 second- feet); minimum stage, from water-stage recorder, 2.27 feet at 4 a. m. September 2JJ (discharge, 395 second-feet). Maximum stage from water-stage recorder, for year ending September 30, 1920, 15.05 feet at noon March 29 (discharge, 35,200 second-feet); minimum stage from water-stage recorder, 2.36 feet, 4 to 6 a. m. October 8 (discharge, 446 second-feet). 1912-1920: Maximum stage recorded, 18.3 feet on the morning of March 28,1913 (discharge, 52,000 second-feet); minimum stage recorded, 1.32 feet at 8.20 a. m. and 4 p. m. September 16, 1913 (discharge, 106 second-feet.) 244 SURFACE WATER SUPPLY, 191&-1920, PART I. ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation probably permanent except as affected by ice. Rating curve well defined between 250 and 55,000 second-feet. Operation of water-stage recorder satisfactory except for periods indicated in footnote to daily- discharge table. Daily discharge ascertained by applying mean daily gage height to rating table, except for days when mean gage height would not give the discharge within 1 per cent, for such days the discharge is the mean of 24 hourly determinations. Records good except for periods when water-stage recorder did not operate satisfactorily and for period of ice effect, for which they are fair. Discharge measurements of Susquehanna River at Conklin, N. Y., during the years ending * . Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Jan. 21 E. D, Burchard...... 4.32 2,390 Jan. 14 ofi.38 717 %tay 7 fi sn 3 QQA Mar. 20 10.10 16,400 A tip* 94. 2.84 700 B.F.Howe...... 2.92 765 Dec. 31 04.18 1,880 14 3.03 791 <* Stage-discharge relation aflected by ice. Daily discharge, in second-feet, of Susquehanna River at Conklin, N. Y., for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 2,830 14,000 1,750 3,680 2,510 A. 3fifl 4,640 3,590 1,810 650 1,100 579 2...... 2,750 9,360 1 7^ft 6,400 2 QCA 9 onn 4 040 3,500 1,630 550 1,100 642 3...... 3,330 6,400 1 880 10, 200 2,360 7,100 3,950 3,500 1,460 500 1,060 684 4...... 3,240 5,380 1 Qftft 2 9Sft 5 nan 5,280 3 eon 1,350 480 997 834 5...... 2,750 4,950 2,200 5,940 2,210 4. fUO 6,860 3,160 1,240 460 882 914 6...... 8,380 4,640 2,200 4,640 2,140 5,500 7,330 4,140 1,180 500 1,030 850 7...... 9,500 4 040 2,200 S Qflft 2,070 5,060 7,100 A (\Af\ 1,100 506 1,630 70ft 8...... 5,980 3^590 2,200 4,230 1 7^ft 4 040 7,100 3,860 988 476 2,000 712 9...... 4,330 3 94/1 2 9ftn 4 040 1,520 5^050 7 eon 4 040 970 1,880 656 10...... 3,500 3,080 2 Af\f\ 3' 500 1,570 8,520 7,330 6^790 OftO 500 i Ann 705 11...... 2,990 2,830 2,800 2,670 1 4.AO 9 240 7,800 11,500 QR9 530 1,120 684 12...... 2,670 2,750 4,000 3,330 1,460 7^100 11,800 12,100 988 500 997 656 13...... 2,440 2,510 5,500 3,330 1,300 12,300 11,800 898 458 938 628 14...... 2 9sn 2 QAA 7,000 2 QQft 1 400 4,950 9 740 10,000 850 791? 874 WQ 15...... 2 J4Q 2 91ft ft ftftA ^ *ym o nAn 3 Q^n 8' fun 7 800 QC/V- 628 Q(\o 614 16...... 2,000 2,070 7,000 4,230 3,680 4 430 7,330 930 586 754 544 17...... 1,810 1 Q4.O 6,000 3 OOA 2 990 6J 7OA 7,800 5,720 1 040 591 656 e*79 18...... 1,690 P; ^tn S ftflft 3 OOA 2^140 9 240 7 son 5,720 i's«m 1,440 698 512 1,570 7-, 100 4 000 2,830 2,070 6,630 5,500 1,070 1,090 684 CIO 20...... 1,460 5 QAT\ 3^400 3 OOA 1,880 7,100 5 CAA i A3n QJ.A aw 893 Piftft 21...... 1,690 4 fun 3 Daily discharge, in second-feet, of Susquehanna River at Coriklin, N. Y., for the years ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June, July. Aug. Sept. 1919-20. 1...... 572 5,040 4,740 1,700 750 800 21,500 6,860 1,020 1,250 1,220 1,750 2...... 537 5,940 3,860 1,500 750 800 17,700 6,170 970 1,300 1,650 1,750 3...... 506 5,500 3,240 1,400 750 850 16,400 5,280 1,010 1,170 1,880 1,750 4...... 500 4,230 2,590 1,200 750 900 14,000 4,840 922 1,020 1,400 1,320 5...... 500 5,280 2,280 1,100 750 13,100 4,330 946 954 1,160 1,120 6...... 551 4,840 2,160 1,000 750 12,800 5,060 962 914 1,030 1,100 7...... 506 3,860 2,210 950 800 3,420 1,060 866 997 1,330 8...... 488 3,240 2,280 900 800 9,000 3,160 962 988 1,090 1,330 9...... 733 2,830 2,940 850 800 5,700 8,040 3,160 979 890 914 1,259 10...... 677 2,440 4,840 800 800 5,500 7,330 3,160 946 782 898 1,420- 11...... 614 2,210 4,740 800 800 15,000'5,500 6,860 3,860 874 740 1,460 2,250 12...... 607 2,440 2,920 800 800 6,400 5,380 834 928 2,010 6,460- 10 705 3,580 3,370 800 850 32,500 6,400 4,430 818 1,130 2,990 12,600 14...... 691 4,530 5,260 800 850 30,200 8,280 3,590 874 970 2,910 12,100 15...... 670 3,950 5,720 850 850 24,400 8,520 3,160 803 988 4,530 7,850' 16...... 789 3,160 3,790 850 850 21,100 6,860 2,590 803 1,030 4,430 5,500" 17...... 1,040 2,670 2,600 850 850 22,900 7,800 2,280 879 946 6,900 4,740 18...... 997 2,440 2,400 850 850 22,600 2,070 2,940 818 6,630 4,140- 19...... 1,070 2,360 2,400 850 850 20,100 2,140 5,720 1,040 6,760 3,330 20...... 1,080 2,210 2,200 850 850 16,800 2,000 1,740 3,780 2,910* 21...... 946 1,880 2,200 850 850 13,400 1,810 2,910 1,810 2,830 2,670' 22...... 882 1,750 2,200 850 900 11,800 1,940 2,280 1,600 2,440 2,360 23...... 858 1,810 2,200 850 onfl 19 son 1,570 1,400 2,280 2,000' 24...... 1,020 1,940 2,200 850 900 16,400 5,940 1,690 1,810 13,200 2,000 1,750< 25...... 1,130 1,940 2,200 850 900 23,700 5,720 1,810 1,630 9,550 1,880 1,630 26...... 962 3,250 2,200 850 850 27,200 5,060 1,570 1,400 4,630 1,570 1,570- 27...... 858 12,100 2,200 850 850 30,200 4,330 1,460 1,210 3,160 1.350 1.460 28...... 941 10,600 2,000 850 800 33,200 5,280 1,300 1,080 2,360 1,310 1,750" 29...... 7,330 2,000 850 800 35,000 7,800 1,250 979 1,880 1,460 3,460 30...... 2,440 5,720 2,000 850 30.200 7,800 1,100 1,180 1,570 1 810 8,110- 31...... 2,670 2,000 800 24,000 1,060 1,320 1,940 NOTE. Discharge estimated Dee. 4-22. 25-28,1918; May 21-24, June 28 to July 5,1919. Hydrograph OB gage-height record intermittent and breaks estimated Nov. 12-16 and 24-27,1918. Chain gage observations made once daily, used Dec. 29,1918, to Jan. 21,1919, inclusive. Discharge, Dec. 17,1919, to Mar. 4,1920, and Mar. 10-12,1920. determined from gage heights corrected for ice effect by means of one discharge measurement at the station and results of 4 discharge measurements of Chenango River at ChenangoForks corrected for difference in drainage areas at the two stations. Water stage recorder did not operate satisfactorily for following periods: Mar. 15. 16, 24, 25, 28, Apr. 1, 2, 9,-ll. 26 and 27,1920; gage-height graph estimated; discharge, Mar. 5-8,1920, estimated at 3,000 second-feet and Apr. 18-23,6,740 second-feet by comparison with records for Chenango River at Chenango Forks; discharge, Mar, 27, estimated: discharge, Apr. 29,30, May 1, and 15-30,1920, determined from readings of chain gage.. 246 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly, discharge of Susquehanna River at Conklin, N. Y.,for the years ending Sept. 30, 1919 and 1920. [Drainage area, 2,350 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 15,100 1,350 3,200 1.36 1.57 14,000 1,940 4,120 1.75 1.95 8,000 1,750 4,140 1.76 2.03 10,200 2,440 4,110 1.75 2.02 3,680 1,300 1,960 .834 .87 9,240 3,500 5,760 2.45 2.82 12,300 3,500 6,180 2.63 2.93 May...... 12,100 1,940 5,200 2.21 2.55 1,810 719 1,060 .451 .50 July...... 3,150 458 973 .414 .48 2,000 586 965 .411 .47 914 464 645 .274 .31 The year...... 15,100 458 3,200 1.36 18.50 1919-20. 2,670 488 928 .395 .46 12,100 1,750 4,040 1.72 1.92 5,720 2,000 2,900 1.24 1.43 1,700 800 935 .398 .46 900 750 822 .350 .38 35,000 800 16,000 6.81 7.85 April...... 21,500 4,330 8,800 3.75 4.18 May...... 6,860 1,060 3,020 1.29 1.49 5,720 803 1,490 .634 .71 July...... 13,200 740 2,030 .864 1.00 6,900 898 2,440 1.04 1.20 12,500 1,100 3,420 1.46 1.63 The yea r ...... 35,000 488 3,910 1.66 22.71 SUSQUEHANNA RIVER AT TOWANDA, PA. LOCATION. At Bridge Street four-span steel highway bridge, Towanda, Bradford County. DRAINAGE AREA. 7,770 square miles. RECORDS AVAILABLE. December 1, 1892, to September 30, 1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Com mission of Pennsylvania and publications of the United States Weather Bureau. GAGE. Chain gage attached to downstream side of bridge; read by Hiram E. Bull. Elevation of zero of gage 693.4 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Banks are high and not subject to overflow. Bed is com posed of gravel and rock. Control is at a riffle extending downstream from right end of bridge to island and from left side of island to left bank; probably permanent. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Septem ber 30, 1919, 12.39 feet at 1 p. m. May 23 (discharge, 72,600 second-feet); mini mum stage, 0.87 foot September 23 (discharge, 1,540 second-feet). Maximum stage recorded during the year ending September 30, 1920, 17.2 feet at 6 p. m. March 13 (discharge, 124,000 second-feet); minimum stage, 0.82 foot October 6 (discharge, 1,480 second-feet). ICE. Stage-discharge relation usually affected by ice. StJSQITEHANNA RIVER BASIN. 247 ACCURACY. Stage-discharge relation probably pennaneht throughout the year except as affected by ice Jan. 12-17,1919, December 18,1919, to March 11,1920. Eating curve well defined between 1,150 and 167,000 second-feet. Gage read to hun- dredths twice daily; during high stages more frequently. Daily discharge ascer tained by applying daily mean gage height to rating table. Records upod, except those for low water in 1920, which are fair. Discharge measurements of Susquehanna River at Towanda, Pa., during the years ending Sept. 30, 1919 and 1920. Gage Dis Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Aug. 26 1.21 2,080 Feb. 9<* H. L. Landls...... 2.00 1,840 May 13 .....do...... 3.86 13,800 1920. Sept. 25 O.W. Hartwell...... 1.68 2,840 Jan. 7« H.L.Landis...... 2. 38 2,630 a Measurement made through complete ice cover. Daily discharge, in second-feet, of Susquehanna River at Towanda, Pa., for the years ending Sept. 30, 1919 and 1920. Day Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 7,600 36,100 6,150 9,120 5,720 7,600 14,400 10,700 7,600 2,400 4,550 2,110 2...... 7,600 24,500 5,720 16, 100 4,550 22,000 12,800 10,700 6,600 2,200 3,860 2,110 3 9,120 17,300 5,310 22,600 3,860 17,300 12,300 11,200 6,150 2,020 3,540 1,930 4...... 10,700 13,900 4,920 19,000 5,310 14,400 13,900 10,200 5,310 1,840 2,960 1,930 5...... 8,600 12,800 4,920 13,300 4,920 12,800 17,800 9,640 4,920 1,760 2,720 2,110 6...... 16,700 12,800 4,920 10,200 4,550 13,900 19,000 10,200 4,550 1,840 2,960 2,200 7...... 25,800 10,700 4,200 9,120 3,860 14,400 17,800 10,700 4,550 1,840 3,540 2,110 8...... 17,300 9,640 4,550 9,120 3,860 11,700 19,000 10,700 5,310 1,840 4,920 1,930 9...... 12,300 8,600 5,310 10,200 3,240 14,400 23,900 11,200 4,920 1,840 4,200 1,930 10...... 9,640 7,600 7,100 10,700 2,960 32,200 23,300 27,600 5,310 1,760 3,860 1,760 11...... 8,100 7,100 7,100 9,120 2,610 27,000 27,000 59,600 4,550 1,680 2,960 1,760 12...... 6,600 7,100 6,150 7,600 2,960 20,800 36,100 49,000 4,200 1,760 2,610 1,760 13...... 6,150 6,150 6,150 7,600 2,960 16,100 34,800 43,100 3,540 1,840 2,300 1,680 14...... 5,720 5,720 7,600 9,120 3,240 13,900 28,900 32,200 3,240 1,760 2,200 1,680 15...... 5,310 5,310 15,000 8,600 5,310 11,700 22,000 23,300 2,960 1,760 2,110 1,680 16...... 4,920 5,310 19,600 7,100 9,120 11,200 20,200 19,600 2,960 1,840 2,020 1,610 17...... 4,550 4,920 16,700 7,600 8,100 19,000 22,600 18,400 3,240 2,400 2,020 1,680 18...... 4,200 9,640 13,300 9,120 6,600 25,800 22,600 22,000 3,860 2,400 2,960 1,610 19...... 3,860 24,500 10,700 8,600 4,920 28,900 19,000 17,300 3,540 2,960 3,240 1,610 30...... 3,540 19,000 9,120 7,600 4,200 22,000 15,600 14,400 .3,240 2,720. 3,240 1,610 21...... 3,540 15,000 8,100 7,100 4,550 17,800 14,400 23,900 3,240 3,540 3,240 1,610 22...... 4,200 12,800 8,600 6.600 4,200 15,600 13,300 54,300 4,200 4,920 3,860 1,610 23...... 4,920 10,700 13,300 6,150 4,200 13,900 11,700 70,000 3,240 9,640 .3,240 1.540 24...... 4,200 10,200 16,100 8,600 4,200 12,300 10,700 49,000 3,240 10,200 .2,720 1,610 25...... 3,860 8,600 15,000 13,300 4,200 .10,700 10,700 37,500 2,720 7,100 2,400 1,760 26...... 3,540 7,600 17,800 12,800 4,200 9,640 11,200 26,400 2,500 4,920 2,110 2,020 27...... 3,540 7,100 16,100 16,700 4,920 9,640 11,200 .19,600 2,400 4,550 2,300 2.110 28...... 3,540 6,600 13,900 9,120 4,920 16,700 10,700 15,000 3,540 10,200 2,020 1,840 29...... 3.860 6,600 11,700 8,600 19,600 11,200 12,300 3,240 11,200 1,930 1,760 3l""I." 3 SfiO 6,150 10,200 7,600 15,600 11,700 10,200 2,720 7,600 1,930 1,760 23'3QO 9,120 7.100 15.000 8.600 5.310 2.020 248 SURFACE WATER SUPPLY, 1919-1920,, PART I. Daily discharge, in second-feet^ of Susquehanna River at Towanda, Pa., for the years ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1.. . . 1,610 12,800 15,000 4,200 2,000 1,800 36,100 15,600 2,720 2,200 3,240 3,540 2.. . . 1,610 19,600 11,700 3,600 2,000 1,800 32,200 15,000 2,610 2,200 2,720 3,240 3.. . . 1.610 19,000 9,640 3,000 2,000 1,800 30,200 12,800 2,500 2,200 3,540 3,240 4.. . . 1,540 13,300 7,600 3,000 1,800 1,800 27,600 11,700 2,500 2,110 3,540 3,240 5.. . . 1,540 16,100 5,720 2,800 1,800 6,000 24,500 10,700 2,500 1,930 2,960 2,720 6.. . . 1,480 17,300 4,920 2,800 1,800 24,000 25,800 9,640 2,500 1,840 2,610 2,720 7.. . . 1,540 13,900 6,160 2,600 1,800 46,000 25,100 8,600 2,610 1,760 2,400 2,500 8.. . . 1,540 11,200 6,600 2,600 1,800 38,000 22,000 7,600 2,720 1,760 2,300 2,500 9.. . . 1,540 9,640 6,600 2,400 1,800 30,000 18,400 7,600 2,500 1,760 2,720 2,610 10.. . . 1,680 8,100 9,640 2,200 1,800 28,000 16,100 7,100 2,400 1,760 4,550 2,720 11.. . . 1,840 7,600 13,900 2,200 1,800 36,000 14,400 7,100 2,300 1,760 3,540 2,720 12.. . . 1,760 7,100 10,700 2,200 1,800 59,600 12,800 13,900 2,200 1,760 7,100 5,310 13.. . . 1,760 9,120 7,600 2,200 1,800 111,000 13,900 13,300 2,110 1,610 8,400 12,300 14.. . . 1 760 11,700 12,300 2,200 1,800 87,000 22,000 10,200 2,020 1,760 8,600 20,500 15.. . . 1,930 10,200 14,400 2,000 1,800 55,000 20,200 8,600 2,020 1,930 8,900 15,800 16.. . . 1,930 8,600 10,700 2,000 1,800 49,000 17,300 7,100 2,110 1,840 9,640 12,000 17.. . . 2,110 7,600 5,310 2,000 1,800 69,200 19,000 6,160 2,110 1,840 11,700 8,100 18.. . . 2,500 6,600 4,200 2,000 1,800 62,800 18,400 5,720 2,110 1,760 23,900 7,100 19.. . . 2,960 6,150 3,600 2,000 1,800 60,500 15,000 5,310 4,200 2,110 20,800 6,150 20.. . . 2,720 5,720 3,200 2,000 1,800 38,900 13,900 4,920 7,600 2,200 14,400 4,920 21.. . . 2,720 5,310 3,200 2,000 1,800 30,800 12,800 4,920 5,720 2,720 9,120 4,550 22.. . . 2,610 4,920 3,200 2,000 1,800 29,600 12,300 8,100 4,200 3,240 6,800 4 200 23.. . . 2,500 4,920 3,600 2,000 1,800 32,800 13,900 7,600 3,540 5,310 5,720 3,860 24.. . . 2,500 4,920 3,600 2,000 1,800 43,100 13,300 5,720 3,240 27,600 4,920 3,540 25.. . . 2,720 5,310 3,600 2,000 1,800 53,500 13,300 4,920 2,960 41,000 4,550 3,240 26.. . . 2,720 7,600 3,600 2,000 1,800 62,800 11,700 4,550 2,720 15,300 3,860 2,960 27.. . . 2,610 26,400 3,600 2,000 1,800 71,700 10,700 4,200 2,500 9,640 3,540 2,720 28.. . . 2,720 31,600 3,600 2,000 1,800 71,700 10,700 3,860 2,300 6,800 3,240 3,100 29.. . . 4,200 19,600 3,600 2,000 1,800 60,400 16,100 3,540 2,110 5,310 2,960 3,860 30.. . . 7,100 15,000 4,200 2,000 ...... 49,000 17,300 2,960 2,110 4,200 3,100 5,500 31...... 7,600 ...... 4,200 2,000 ...... 41,700 ...... 2,960 ...... 3,540 3,540 ...... NOTE. Discharge Jan. 12-17, 1919, and Dec. 18, 1919, to Mar. 11, 1920, estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. Monthly discharge of Susquehanna River at Towanda, Pa., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 7,770 square miles.]* Discharge in second-feet. Run-off In Month. Per, inches. Maximum. Minimum. Mean. square mile. 1918-19. 25,800 3,540 7,760 0.999 1.15 36,100 4,920 11,300 1.45 1,62 T>ewnlw, , - ... . , 19,600 4,200 9,820 1.26 1.45 22,600 6,160 9,970 1.28 1.48 9 120 2,610 4,580 .589 .61 March ...... '.. 32,200 7,600 16,600 2.14 2.47 April...... 36,100 10,700 18,000 2.32 2.S9 70.000 8,600 24,100 3.10 3.57 7,600 2,400 4,050 .521 .58 July...... 11,200 1,680 3,860 .497 .57 4,920 1,930 2920 .376 .43 R^ptenilwf -- .-...,,...... , 2,200 1,540 1,810 .233 .26 The year...... _ . _ ...... 70,000 1,540 9,620 1.24 16.78 1919-20. 7,600 1,480 2,480 .319 .37 31,500 4920 11,600 1.49 1.66 "December _ 15,000 3,200 6,760 .870 1.00 4,200 2,000 2,320 .299 .34 2,000 1,800 1,820 .234 .25 March...... 111,000 1,800 43,400 5.59 6.44 April...... 36,100 10,700 18,600 2.39 2.67 May...... 15,600 2,960 7,810 1.01 1.16 7,600 2,020 2,860 .368 .41 July...... 4,100 1,610 5,250 .676 1 .78 23,900 2,300 6,420 .826 .95 September...... 20,500 2,500 5,380 .692 .77 111,000 1,480 9,590 1.23 16.80 SUSQUEHANKA BIVEK BASIN. 249 SUSQUEHANNA RIVER AT WILKES-BARRE, PA., LOCATION. At Market Street four-span steel highway bridge, Wilkes-Barre, Luzerne County. DRAINAGE AREA. 9,960 square miles. RECORDS AVAILABLE. November 1, 1890, to September 30, 1920. Eecords prior to October 1, 1918, are contained in. the annual reports of the Water Supply Com mission of Pennsylvania, and publications of the United States Weather Bureau, GAGE. Chain gage attached to upstream side of bridge; read by Milton Wentz. Elevation of zero of gage 511.03 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from upstream side of bridge, except in extreme high stages when they are made from the Port Bowkley railroad bridge, where the entire discharge of the, stream is confined to one channel without overflow* CHANNEL AND CONTROL. Eight bank is low and subject to overflow at stage of about 18.5 feet; left bank subject to overflow only at extreme high stages. Bed is composed of culm, sand, and gravel. Control for low stages is at a riffle about 4,000 feet below gage; occasionally shifting. For high stages the control is probably the dam at Nanticoke, 9 miles below the gage. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Sep tember 30, 1919, 16.61 feet at 8 a. m. May 24 (discharge, 66,900 second-feet); minimum stage, 2.28 feet September 22 (discharge, 1,670 second-feet). Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 26.0 feet at midnight March 13-14 (discharge, 155,000 second-feet); minimum stage 2.12 feet at 8 a. m. October 10 (discharge, 1,440 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation probably permanent throughout both years, except as affected by ice January 10-16, 1919, and December 18, 1919, to Febru ary 29,1920. Eating curve well defined between 1,700 and 160,000 second-feet. Gage read to hundredths twice daily, during high stages more frequently. Daily discharge ascertained by applying daily mean gage height to rating table. Eecords good. Discharge measurements of Susguehanna River at Wilkes-Barre, Pa., during the years endmg Sept. SO,' 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by charge. 1919. Feet. Sec.-jt. 1920. Feet. Sec.-ft. Aug. 28 2.99 *> QJA Jan. 116 3.35 2,620 Oct. 1 2.40 1,810 Feb. 126 .....do...... 2.95 2.830 NOV. 6a 8.66 24,600 May 12 .....do...... 5.32 9,910 7 .....do...... 7.90 19,900 .....do...... 3.08 3,200 a Measurement made by surface method. * Measurement made through, incomplete ice cover. 850 SURFACE WATER SUPPLY, 1919^1^0, PART I. Daily discharge, in second-feet, of Susquehanna River at Wilkes-Barre, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 10,500 36,400 7,250 10,900 9,000 9,750 18,200 12,100 9,000 3,270 6,290 2,290 2...... 9,000 34,900 6,920 13,300 7,250 17,400 16,100 12,900 7,920 2,660 5,990 2,200 3...... 8,270 24,500 6,920 22,200 6,600 25,400 13,700 11,700 6,920 2,470 4,150 2,470 4...... 12,500 18,700 6,290 23,600 5,700 21,400 14,500 12,500 6,290 2,290 3,920 2,200 5...... 12,500 16,500 5,990 18,200 6,920 17,800 16,500 11,300 5,700 2,200 3,270 2,120 6...... 11,300 15,300 5,700 15,300 6,290 17,000 30,900 9,750 4,890 2,040 3,480 2,200 7...... 28,700 14,500 5,700 12,900 5,700 18,200 21,400 9,750 5,420 2,120 5,700 2,200 8...... 27,700 12,900 5,700 12,500 5,420 17,400 19,600 11,700 4,890 2,040 4,640 2,120 9...... 19,600 11,300 5,150 11,300 5,150 17,000 23,200 12,900 5,150 2,040 5,420 2,040 10...... 14,900 10,100 5,700 10,000 4,640 35,400 26,800 14,900 5,150 2,200 4,150 2,470 11...... 12,100 9,000 7,580 10,000 4,150 36,400 25,000 52,600 4,640 2,040 4,150 2,470 12...... 10,500 S,270 7,920 10,000 3,700 29,600 31,500 56,900 4,640 2,290 4,150 2,200 13...... 8,630 7,920 7,250 9,500 3,920 24,000 39,000 49,900 4,150 2,200 3,480 1,880 14...... 7,920 7,580 7,580 9,000 4,640 20,900 35,400 43,100 3,920 2,120 3,270 2,120 15...... 6,920 6,920 9,750 9,000 5,700 18,200 29,600 32,000 4,390 2,200 2, $60 1,960 16...... 6,600 6,600 17,000 9,000 9,000 14,900 25,400 26,800 3,920 2,200 2,660 1,880 17...... 6,290 6,290 21,400 9,370 11,300 19,600 27,700 23,600 4,150 2,200 3,060 1,880 18...... 5,700 6,920 17,800 9,750 10,100 26,300 27.700 24,500 3,920 2,200 2,860 1,810 19 5,420 18j700 14,500 9,750 7,920 32,000 25,000 25,900 4,390 2,660 3,270 1,740 20...... 5,150 28,200 12,100 9,750 6,600 29,600 22,700 20,900 4,390 3,920 3,920 1,670 91 4,640 22,200 10,500 9,000 5,990 24,500 18,700 17,400 4,150 4,390 3,700 1,670 99 4,640 18,200 9,370 9,000 5,990 21,400 17,400 34,500 3,920 7,580 3,480 1,670 no 4.890 15,300 12,100 9,000 5,990 18,700 16,100 55,000 5,150 14,500 3,920 1,880 24...... 5.420 12,900 19,100 11,300 5,990 16,500 14,100 63,100 3,700 9,370 3,480 1,810 25...... 5,420 11,700 20,000 14,100 5,700 14,500 12,100 42,500 3,480 9,000 3,270 1,810 26...... --..- 4,890 10,500 19,100 17,000 6,920 12,900 11,300 37,900 3,270 7,250 3,060 1,670 97 4,640 9,370 20,900 15,700 7,580 11,300 12,500 27,200 3,060 6,600 2,660 1,670 no 4,640 8,630 19,100 13,300 7,580 13,700 13,700 21,400 3,270 6,920 2,660 1,670 9O 4,640 7,920 15,700 11,700 20,900 12,900 16,100 3,270 9,750 2,660 1,810 30...... 4,890 7,250 13,700 10,900 21,800 12,100 10,500 3,920 10,500 2,470 1,810 31...... 5,990 12,500 9,750 19,100 10,500 8,630 2,470 1919-20. 1...... 1,810 8,630 20,400 4,600 2,400 2,660 43,100 20,400 3,480 2,660 4,890 4,890 2...... l'740 17,800 17,800 4,400 2,400 2,860 39,000 18,200 3,270 2,660 4,390 4,390 3...... 1,670 24,500 14,500 4,200 2,400 2,660 35,900 17,800 3,270 2,660 3,920 4,150 4...... 1,670 22,200 11,700 3,800 2,400 2,860 33,500 15,300 2,860 2,660 3,700 3,920 5...... 1,610 22,200 9,000 3,400 2,400 6,920 31,500 12,900 3,480 2,660 4,150 3,700 6...... 1,610 23,200 8,270 3,200 2,400 19,600 30,100 12,500 4,640 2,660 3,700 3,700 7...... 1,550 20,400 6,600 3,000 2,600 29,600 30,600 11,300 3,920 2,290 3,270 3,700 8...... 1,550 17,000 7,920 3,000 2,600 29,600 29,100 9,370 3,480 2,660 3,270 4,150 1,500 13,300 8,630 2,800 2,600 26,300 24,500 9,000 3,270 2,860 3,270 3,480 10...... 1,500 11,300 10,900 2,800 2,600 24,000 22,200 9,000 3,270 2,470 2,860 3,920 11...... 1,610 9,750 14,500 2,600 2,600 24,500 20,000 8,630 3,060 2,470 3,270 9,000 12...... 1,610 9,370 15,700 2,600 2,800 49,900 17,000 8,630 3,060 2,470 5,150 20,000 13...... 1,810 9,750 12,900 2,400i 2,800 130,000i 16,500 17,000 3,060 3,060 7,920 15.700 14...... 2,120 12,500 16,500 2,400 2,800 130,000 20,900 16,100 2,860 2,860 9,370 IT; ooo 15...... 2,200 13,700 18,200 2,400 2,600 77,400 25,900 12,500 2,660 2,660 10,500 21,400 16...... 2,120 12,100 18,700 2,400 2,600 58,200 23,600 9,750 2,470 3,270 10,900 16,500 17...... 2,660 10,500 14,500 2,400 2,600 69,200 21,800 9,000 2,860 2,860 12,100 12,100 18...... 3,480 9,000 6,000 2,400 2,600 80,700 23,600 7,920 5,150 2,660 13,700 9,370 19...... 3,700 7,920 4,000 2,400 3,000 63,100 22,700 6,920 5,150 2,290 25,900 6,920 20...... 3,920 7,250 3,400 2,400 3,000 51,500 19,100 6,290 4,890 3,060 22,200 5,990 21...... 3.480 6,920 3,400 2,400 3,000 42,000 17,000 6,290 9,000 3,060 16,100 5,990 22...... 3,270 6,290 3,400 2,400 3,000 36,900 17,000 6,600 6,920 2,860 11,300 5,150 23...... 3,270 5,990 3,600 2,800 3,000 39,500 17,000 7,920 5,990 4,390 8,270 4,640 24...... 2,860 5,700 4,000 2,800 3,000 47,200 17,400 9,000 4,890 23,200 6,920 4,390 25...... 2,860 5,700 4,000 2,800 3,000 58,200 16,500 7,250 4,150 48,300 5,990 4,150 26...... 2,660 9,750 4,000 2,800 3,000 70,800 15,700 6,290 3,920 34,500 5,150 3,700 27...... 2,860 30,600 4,200 2,600 2,800 79,800 14,500 5,700 3,270 18,200 4,640 3,480 28...... 3,060 42,500 4,400 2,600 2,800 81,500 13,300 5,150 3,060 12,900 4,150 4,150 29...... 3,060 34,000 4,400 2,400 2,800 72,400 14,100 4,640 2,860 9,000 4,640 6,290 30...... 4,150 25,000 4,600 2,400 59,600 19,600 3,920 2,660 6,920 7,250 9,000 81...... 6,920 4,600 2,400 ...... 49,300 3,920 5,700 5,420 NOTE. Discharge Jan. 10-16,1919, and Dec. 18.1919, to Feb. 29,1920, estimated, because of ice, from dis charge measurements, weather records, and study of gage-height graph. SUSQUBHANNA EIVEB BASIN. 251 Monthly discharge of Susquehanna River at WUkes-Barre, Pa., for the years ending Sept,. SO, 1919 and 1920. [Drainage area, 9,960 square miles.] Discharge in second-feet. Run-Off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 28,700 4,640 9,190 0.923 1.06 November...... 36,400 6,290 14,200 1.43 1.60 December...... 21,400 5,150 11,500 1.15 L33 23,600 9,000 12,100 1.21 1.40 February...... 11,300 3,700 6,480 .651 .68 March...... 36,400 9,750 20,800 2.09 2.41 April...... 39,000 11,300 20,700 2.08 , 2.32 May...... 63.100 9,750 26,200 2.63 3.03 9,000 3,060 4,700 .472 .53 July...... 14,500 2,040 4,580 .460 .53 August...... 6,290 2,470 3,690 .370 .43 .2,470 1,670 1,980 .199 .22 The year...... 63,100 1,670 11,400 1.14 15.54 1919-20. October...... 6,920 1,500 2,580 .259 .30 42,500 5,700 15,200 1.53 1.71 December...... 20,400 3,400 9,180 .922 1.06 4.600 2,400 2,840 .285 .33 February...... 3,000 2,400 2,710 .272 .29 March...... 130,000 2.660 49,000 4.92 5.67 April...... 43,100 3,300 23,100 2.32 2.59 May...... 20,400 3,920 9,840 .988 1.14 June...... 9,000 2.470 3,900 .392 .44 July...... 48.300 2,290 7,190 .722 .83 25,900 2,860 7,690 .772 .89 September ...... 21,400 3,480 7,500 .753 .84 130,000 1,500 11,800 1.18 16.09 StTSQUEHANNA RIVER AT DASVILLE, PA. LOCATION. At seven-span steel highway bridge between South Danville and Dan ville, Montour County. DRAINAGE AREA. 11,200 square miles. RECORDS AVAILABLE. March 25,1899, to December 31,1903, and March 23, 1905, to September 30,1920. Records prior to October 1,1918, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by E. F. Bell. Eleva tion of zero of gage 430.47 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Left bank is high and not subject to overflow; right bank subject to overflow at extremely high stages. Bed is composed of gravel and rock. Control is at a riffle a short distance below the gage; practically permanent. EXTREMES OF MBCHARGB. Maximum stage recorded during the year ending Septem ber 30,1919,13.7 feet at 12.30 p. m. May 24 (discharge, 80,800 second-feet); mini mum stage, 2.3 feet several daysin September (discharge, 2,030 second-feet). Maximum stage recorded during the year ending September 30, 1920, 20.9 feet at 7 a. m. March 14 (discharge, 170,000 second-feet); minimum stage 2.2 feet from 4 p. m. October 8 to 4 p. m. October 9 (discharge, 1,810 second-feet). ICE. Stage-discharge relation usually affected by ice. 252 SURFACE WATER SUPPLY, 1919-1920, PAET I. ACCURACY. Stage-discharge relation practically permanent throughout the year except as affected by ice January 11-13, 1919, and January 1 to March 7,1920. Rating curve well defined between 800 and 150,000 second-feet. Gage read to tenths twice daily; during high stages more frequently. Daily discharge ascer tained by applying daily'mean gage height to rating table. Records good. Discharge measurements of Susquehanna River at Danville, Pa., during the years ending Sept. 30, 1919 and 1920. Gage Dis Dis Date. Made by- height. charge. Date. Made by height. charge. 1918. Feel. Sec.-ft. 1920. Feet. Sec.-ft. Oct. 5« 5.23 12,900 Jan. 146 4.32 4,570 Feb. 166 .....do...... 4.30 3,600 1919. June 22 .....do...... 4.54 11,100 2.76 3,240 23 .....do...... 4.18 9,290 o Measurement made by surface method. 6 Measurement made through complete ice cover. Daily discharge, in second-feet, of Susquehanna River at Danville, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June/ July. Aug. Sept. 1918-19. 1...... 13.600 28,200 8.780 13, 100 10.700 10,700 21,800 13,600 12,600 4,640 8,780 2,800 2...... 11,200 45,000 7.870 15,100 9 o en 16,700 20,000 14,600 10,700 3,980 7,000 2,530 3...... 9,730 32,500 7,870 21,200 8.780 26,200 17,800 14,600 9,250 3,370 6,580 2,800 4...... 9,730 24,200 7 430 28,900 7 000 27,500 15,600 14,100 8,780 3,220 5,380 2,800 5...... 12,600 19,400 7^000 26,200 7^000 17 800 13,600 7,430 2,940 4,640 2,800 6...... 16,100 17,200 6,580 21,200 7,870 19,400 21,200 12,600 7,000 2,660 4,640 2,530 7...... 20,000 16,100 6.580 17,800 7.870 18,900 23,600 11,600 7,000 2,940 5,380 2,530 8...... 37,700 14,600 6,170 14,600 7,000 19,400 23,600 12,600 6,170 2,800 7,000 2,530 9...... 30,300 13,100 6,170 13,600 6,170 18,300 23,600 13,600 6,170 2,660 6,170 2,530 10...... 18,900 11,600 5,770 13,100 6,170 9Q fifYl 28,200 16,100 6,580 2,660 6,170 2,940 11...... 14,600 10,700 6,580 12,000 4,640 45,800 30,300 6,170 7,000 3,080 12...... 12,600 9,730 7,870 11 000 4 640 on oftfl 34 600 TO EflA 6,170 n QAt) 5 OQA 2 940 13...... 10,700 9,250 8,320 9! 500 4*640 30,300 45,000 63,600 5,770 2,660 4,640 2' 800 14...... 9,730 8,320 8,780 5,000 24 200 45,800 56,300 5,380 9 fifin 3,980 2,660 15...... 8,780 7,870 9,250 9 700 6,580 20 000 oo .inn 42,500 5,380 2 AAft 3,820 9 Mft 16...... 7,870 7,870 12,600 9,730 8,320 17,800 30,300 33,200 6,170 3,220 3,220 2,530 17...... 7,870 7,430 21,200 10,200 10,200 18.300 32,500 27,500 5,000 3,080 3,220 2,400 18...... 7,000 9,250 20,600 10,700 11,600 23,600 33,900 24,900 5,000 2,660 3,520 2,270 19...... 6,580 15,100 16,700 11,200 10,700 35,400 31,700 28,900 4 640 9 QJft Q Q7n 2 97ft 20...... 6,170 33,200 14,100 11,200 8,780 37,700 28,200 24,900 5^380 3 <59n 3,670 2,030 21...... 6,170 28,200 12,600 10,700 7,430 31,000 no Anft 21,200 5,380 8.320 A Run 2,030 22...... 6,170 21,800 11.200 10,200 7 ndo 24,900 21,200 23,600 4,640 9,730 4,300 2,030 23...... 5,770 17,800 14,100 10,200 7,000 21,800 18,900 64,500 4 (Uft 11 600 3 Qsn 2,150 24...... 5,770 15,100 20,000 14,100 7,000 19,400 17,800 79,800 6,380 13^600 4,300 2,530 25...... 6,170 13,600 24,900 16,700 7,000 17,200 15,600 63,600 4 640 9 730 S QSft 2,270 26...... 6,170 11,600 23,600 17,800 7,870 15,600 13,600 47,500 3,980 8,780 3,820 2,270 27...... 6,170 10,700 23,000 18,900 8,780 14,100 14.100 36,100 q Qsn 8,780 3,520 2,270 28 5,770 9 nn 22,400 16,100I s 7fin 16,000 lilOO 26 900 Q asft 7,870 3,220 2,030 29...... 5,770 9,250 19,400 14,100 21,200 13,6001 91 'win 3,820 8,320 3,370 9 naft 30...... 6,170 9,250 15,600 12,600 26,200 13,600 17,800 3,880 12,600 3,080 2,270 31...... 10,200 14,100 11.600 23,600 14.100 11.600 2,800 SUSQ17BHANNA SIVER BASIN. 253 Daily discharge, in second-feet, of Susquehanna Ritfer at Dawv&te, Pa., for the years ending Sept. 30, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20, 1...... 2,270 9,730 26,200 5,500 2,200 3,000 52,700 21,200 4,640 3,520 6,580 6,170 2...... 2,270 11,600 2-1,200 4,600 2,000 3,400 45,800 20,000 4,300 3,370 5,380 5,000 3...... 2,270 23,600 18,900 4,200 2,000 3,400 41,700 18,900 3.980 3,370 4,640 4,640 4...... 2,030 ,27,500 14,600 3,800 2,200 3,400 38,400 17,200 3,980 3,820 4,300 4,640 5...... 2,030 26,200 12,600 3,600 2,200 13,000 36,900 14,600 4,300 3,670 4,300 4,300 6...... 2,030 28,900 10,700 4,600 .2,000 .32,000 36,100 13,600 6,170 3,670 4,640 4,300 7...... 2,030 27; 500 9,730 6,500 2,000 40,000 33,200 12,600 5,770 3,220 4,300 4,640 8...... 1,920 21,200 8,780 9,000 2,000 49,200 33,900 11,600 5,380 4,640 3,980 4,300 9...... 1,810 17,200 10,700 9,000 2,000 36,100 29,600 10,700 4,640 3,980 3,670 4,640 10...... 2,030 14,600 14,600 7,000 2,200 30,300 24,900 9,730 4,300 3,820 3,670 4,300 tt:...... 2,030 12,600 15,100 5,800 2,200 31,700 21,200 9,730 3,980 3,370 3,670 5,000 12...... 2,030 11,600 17,800 5,000 2,200 43,300 18,900 9,250 3,820 3,980 4,300 9,250 13...... 2,270 11,600 16,700 4,400 2,200 129,000 18,300 11,600 3,670 4,640 6,170 17,800 14...... 2,400 12,600 18,900 4,000 2,600 164,000 21,200 17,800 4,300 4,300 9,730 15,100 15...... 2,800 14,600 22,400 3,600 3,000 120,000 24,900 14,600 3,980 4,640 10,200 19,400 16...... 2,800 15,100 23,600 3,600 3,600 79,800 26,200 12,100 3,670 5,000 11,200 20,000 17...... 3,370 13,100 20,600 3,000 4,000 83,000 27,500 10,700 3,820 4,640 11,600 14,600 18...... 3,820 11,600 15,600 2,800 3,600 101,000 28,900 9,730 7,870 3,820 14,600 11,200 19...... 4,640 9,730 10,700 2,400 3,400 86,300 28,200 8,320 8,780 3,670 22,400 8,780 20...... 3,980 8,780 8,780 2,200 3,400 69,400 24,200 7,870 7,870 3,670 26,200 7,870 21...... 3,980 7,870 7,430 2,400 3,400 54,500 21,200 7,430 8,320 3,820 20,600 7,000 22...... 3,980 7,870 8,780 2,600 3,400 45,800 19,400 7,870 10,200 3,820 14,100 6,170 23...... 3,980 7,430 9,730 2,600 3,600 44,100 18,900 7,870 8,320 3,980 10,700 5,380 24...... 3,980 7,000 9,730 2,800 3,600 51,000 18,900 10,200 7,000 5,770 8,780 5.000 25...... 3,980 6,580 10,700 2,800 3,600 65,500 18,300 9,250 5,770 39,200 7,000 4,640 26...... 3,670 8,780 9,730 3,000 3,400 77,700 17,200 7,870 5,000 50,100 6,170 4,300 27...... 3,980 23,600 8,320 3,000 3,400 88,500 16,700 7,000 4,640 26,200 5,380 3,980 28...... 3,980 51,000 7,870 3,000 3,600 95,300 15,100 6,580 4,300 15.600 5,000 5,000 29...... 3,980 47,500 8,320 2,800 3,400 88,500 14,100 6,170 3,980 11,600 5,380 5,380 30...... 3,980 33,200 7,430 2,600 77,700 17,200 5,380 3,670 8,780 7,430 7,870 31...... 5,770 6,170 2,200 61,700 5,000 7,430 7,870 NOTE. Discharge Jan. 11-13,1919, and Jan. l to Mar. 7,1920, estimated because of ice from discharge measurements, weather records, and study of gage-height graph. Discharge Mar. 28,1919, estimated from record of flow at Wilkes-Barre. Monthly discharge of Susquehanna River at Danville, Pa., for the years ending Sept. 30, 1919 and 1920. [Drainage area, 11,200 square miles.] Discharge in second-feet. Month. Per Run-off Maximum. Minimum. Mean. square in inches. mile. 1918-19. 37,700 5,770 11,000 0.982 1.13 N ovember...... 45,000 7,430 16,300 1.46 1.63 24,900 5 770 12,800 1.14 1.31 28,900 8,780 14,300 1.28 1.48 11,600 4,640 7,630 .681 .71 45,800 10,700 23,600 2.11 2.43 April...... 45,800 13,600 24,300 2.17 2.42 May...... 79,800 11,600 31,200 2.79 3.20 12,600 3,820 6,040 .539 .60 July...... 13,600 2,660 5,550 .496 .57 8,780 2,800 4,660 .416 .48 September ...... 3,080 2,030 2,470 .221 .25 79,800 2,030 13,400 1.20 16.21 1919-20. October...... 5,770 1,810 3,100 .277 .32 51,000 6,580 17,700 1.58 1.76 26,200 6,170 13,300 1.19 1.37 9,000 2,200 4,010 .358 .41 4,000 2^000 2,840 .254 .27 164,000 3,000 60,400 5.39 6.21 April...... 52 700 14,100 26,300 2.35 2.62 May...... 21,200 5,000 11,000 .982 1.13 10,200 3,670 5,350 .478 .53 July...... 50,100 3,220 8,230 .735 .85 26,200 3,670 8,510 .760 .88 20,000 3,980 7,690 .687 .77 The year...... 164,000 1,810 14,100 L26 17.12 254 SURFACE WATER SUPPLY, 1S1^-1920, PART I. STJSQTTEHA1INA RIVER AT HARRISBURG, PA. LOCATION. At Walnut Street 15-span steel highway bridge, Harrisburg, Dauphin County. DRAINAGE AREA. 24,100 square miles. RECORDS AVAILABLE. January 1, 1891, to September 30, 1920. Records prior to October 1, 1918, are contained in. the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to upstream side of bridge; read by employees of the Water Supply Commission of Pennsylvania. Elevation of zero of gage 289.4 feet, United States Geological Survey datum. Sanborn water-stage recorder is located on top, downstream corner, of left abutment and referred to same datum as chain gage. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Banks are high and not subject to overflow. Bed is com posed of gravel and boulders. A low dam 4,200 feet below the gage, completed on August 29,1916, is the control for all except high stages. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Septem ber 30, 1919, 15.98 feet at 9 p. m., May 23 (discharge, 294,000 second-feet); mini mum stage, 3.28 feet at 8.50 a. m., September 30 (discharge, 4,940 second-feet). Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 20.2 feet at 11 p. m., March 13 (discharge, 425,000 second-feet); minimum stage, 3.27 feet at 5 p. m., October 9 (discharge,, 4,840 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout both years, except as affected by ice, December 17,1919, to March 12,1920. Rating curve well denned between 4,000 and 300,000 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily discharge ascerjtained by applying daily mean gage height, computed from chain gage readings used in connection with water-stage recorder graph, to rating table. Records good. Discharge measurements of Susquehanna River at Harrisburg, Pa., during the years end ing Sept. SO, 1919 and 1920. Gage Dis Gage D's- Date. Made by charge. Date. Made by height. charge. « 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. May 13« 148,000 Jan. 226 4 77 10,800 22a 13.20 218,000 Feb. 66 4.52 9,620 23o .....do...... 15.62 296,000 256 4 60 14,100 24« .....do...... 14.96 261,000 a Measurement made by surface method. & Measurement made, through complete ice cover. STJSQUEBANNA BWEB BASIN. 255 Daily discharge, in second-feet, of Susquehanna,River at Harrisburg, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 24,000 62,000 19,100 33,100 25,800 29,400 47,200 25,800 36,900 19,100 18,300 9,600 2...... 20,700 90,000 17,600 35,000 22,300 36,900 43,000 27,600 31,200 16,800 15,400 9,000 3...... 18,300 83,500 16,800 49,300 20,700 51,400 40,900 29,400 27,600 14,000 14,000 9,000 4...... 16,800 57,700 16,100 66,300 19,900 57,700 36,900 27,600 24,000 12,700 12,700 9,000 5...... 16,800 45,100 15,400 66,300 18,300 51,400 35,000 27,600 22,300 10,800 11,400 9,000 6...... 22,300 38,900 14,700 51,400 16,8,00 45,100 35,000 27,600 20,700 10,200 12,000 9,000 7...... 25,800 33,100 14,000 40,900 16.&DO 40,900 36,900 25,800 19,900 9,600 12,700 8,400 3...... 47,200 29,400 14,000 35,000 17,600 22,300 36,900 24,'000 20,700 9,600 14,000 7,850 53,500 27,600 12,700 33,100 14,700 24,000 36,900 25,800 19,900 9,600 13,300 7,190 10...... 40,900 24,000 12,700 33,100 14,000 62,000 36,900 35,000 18,300 8,400 13,300 7,080 11...... 33,100 22,300 12,700 29,400 15,400 83,500 45,100 120,000 20,700 8,400 12,700 7,860 12...... 27,600 20,700 14,000 27,600 14,700 83,500 47,200 183,000 19,900 8,400 12;000 7,300 13...... 22,300 19,100 16,800 25,800 14,000 68,400 57,700 155,000 17,600 10,200 10,200 7,850 14...... t 19,100 18,300 20,700 20,700 14,000 57,700 68,400 118,000 17,-600 9,000 9,600 7>300 15...... 18,300 16,800 24,000 20,700 15,400 49,300 64,200 94,200 14,700 9,000 9,000 6,860 16...... 16,800 16,100 31,200 22,300 20,700 43,000 55,600 74,900 17,600 12,700 8,400 6,310 17...... 22,300 15,400 38,900 25,800 22,300 43,000 53,500 62,000 17,600 14,000 15,400 6,100 IS...... 14,000 16,800 45,100 24,000 22,300 51,400 59,800 55,600 17,600 17,600 18,300 5,990 19...... 13,300 36,900 40,900 24,000 24,000 68,400 59,800 59,800 15,400 16,100 20,700 5,780 20...... 12,700 45,100 35,000 25,800 20,700 79,200 57,700 62,000 14,700 14,700 29,400 5,570 21...... 12,700 57,700 31,200 24,000 19,100 72,800 49,300 .90,000 14,000 19,100 27,600 5,150 22 12,000 47,200 27,600 24,000 16,800 62,000 43,000 210,000 13,300 35,000 22,300 5,150 23....J...... 12,000 38,900 40,900 2'4,000 18,300 53,500 38,900 280,000 12,700 53,500 20,700 5,360 34...... 12,700 36,900 51,400 27,600 18,300 45,100 36,900 268,000 12,000 51,400 17,600 5,880 25...... 11,400 31,200 70,600 36,900 19,900 40,900 31,200 199,000 12,000 38,900 14,700 5,570 26...... 12,700 27,600 66,300 40,900 19,900 36,900 29,400 132,000 12,000 29,400 13,300 6,420 27...... 12,700 24,000 59,800 43,000 27,600 33,100 29,400 103,000 14,700 22.300 12,000 6,200 28...... 13,300 22,300 53,500 40,900 29,400 43,000 27,600 79,200 29,400 19,900 11,400 5,570 29...... 15,400 20,700 49,300 35,000 53,500 25,800 51,400 27,600 18,300 10,800 5,150 30...... 16,800 19,900 40,900 31,200 55,600 25,800 51,400 24,000 16,100 10,200 5,040 31...... 22,300 36,900 29,400 53,500 43,000 18,300 10,200 1919-20. 1...... 5,260 24,000 70,600 17,000 10,000 12,000 90,000 45,100 12,700 10,800 12,000 16,100 2...... 5,360 35,000 57,700 15,000 9,000 12,000 77,000 53,500 12,000 10,800 12,000 13,300 3...... 5,680 59,800 49,300 13,000 8,500 12,000 70,600 51,400 12,000 10,800 10,800 11,400 4...... 5,150 79,200 40,900 11,000 7,500 12,000 66,300 49,300 11,400 10,200 9,000 10,200 5...... 5,040 72,800 33,100 10,000 7,500 26,000 70,600 45,100 12,000 10,800 8.400 9,600 6...... 5,150 66,300 29,400 10,000 9,000 100,000 79,200 38,900 14,000 10,800 8,400 9,000 7...... 5,040 59,800 27,600 10,000 9,500 160,000 79,200 35,000 16,800 10,800 11,400 12,700 8...... 5,040 51,400 25,800 13,000 10,000 140,000 72,800 31,200 16,100 10,800 12,000 19,900 9...... 4,940 43,000 29,400 17,000 11,000 140,000 66,300 29,400 14,700 10,200 9,600 15,400 10...... 5,150 35,000 38,900 20,000 11,000 130,000 59,800 27,600 13,300 10,800 9,600 14,000 11...... 6,100 31,200 47,200 20,000 12,000 130,000 51,400 25,800 12,000 9,600 10,800 16,800 12...... 6,640 31,200 43,000 18,000 13,000 140,000 47,200 24,000 12,000 10,200 14,000 19,900 13...... 6,530 31,200 43,000 17,000 13,000 309,000 40,900 24,000 12,000 10,800 16,800 19,900 14...... 7,850 36,900 47,200 15,000 13,000 406,000 45,100 27,600 10,800 12,700 16,800 29,400 15...... 10,200 36,900 59,800 13,000 13,000 300,000 49,300 36,900 10,800 10,800 16,800 25,800 16...... 12,000 35,000 53,500 12,000 13,000 194,000 51,400 31,200 11,400 10,800 18,300 29,400 17...... 12.700 33,100 36,000 11,000 15,000 176,000 53,500 27,600 11,400 11,400 20,700 27,609 18...... 13,300 29,400 26,000 9,500 16,000 210,000 66,300 24,000 25,800 10,800 20,700 22,300 19...... 16,100 24,000 22,000 9,000 15,000 202,000 77,000 22,300 45,100 9,600 24,000 17,600 20...... 20,700 24,000 24,000 9,000 18,000 155,000 74,900 20,700 57,700 9,000 36,900 14,700 21...... 17,600 22,300 24,000 9,500 18,000 125,000 66,300 20,700 40,900 8,400 40,900 12,700 22...... 15,400 20,700 26,000 11,000 18,000 107,000 64,200 20,700 33,100 8,400 33,100 12,000 23...... 14,000 19,100 26,000 11,000 18,000 94,200 62,000 22,300 31,200 9,000 25:800 11,400 24...... 13,300 17,600 26,000 11,000 17,000 96,400 57,700 22,300 25,800 8,400 19,900 10,200 25...... 13,300 16,100 26,000 11,000 16,000 112,000 53,500 24,000 22,300 9,600 17,600 9,600 26...... 12,000 16,800 24,000 12,000 13,000 132,000 49,300 22,300 19,100 57,700 14,700 9,000 27...... 12,000 31,200 24,000 12,000 15,000 150,000 45,100 20,700 17,600 49,300 13,300 9,000 28...... 13,300 103,000 22,000 12,000 14,000 164,000 40,900 18,300 14,700 29,400 12,000 10,800 29...... 16,100 118,000 22,000 i2;ooo 13,000 146,000 38,900 16,800 13,300 19,900 13,300 10,800 30...... 17,600 92,100 20,000 12,000 129,000 40,900 15,400 12,000 15,400 13,300 15,400 31...... 22,300 19,000 12,000 ------105,000 14,700 13,300 14,700 NOTK. Discharge Dec. 17,1919, to Mar. 12,1920, estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. 256 SURFACE WATER SUPPLY, 1919-1920, PAET I. Monthly discharge of Susquehanna River at Harrisburg, Pa., for the years ending Sept. SO, 1919 and [Drainage area, 24,100 square miles.] Discharge in second-feet. Run-off Month.. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 53,500 11,400 20,600 0.855 0.99 90,000 15,400 34,800 1.44 1.61 70,600 12,700 31,000 1.29 1.49 66,300 20,700 33,800 1.40 1.61 29,400 14,000 19,300 .801 .83 83.500 22,300 51,600 2.14 2.47 April...... 68,400 25,800 43,100 1.79 2.00 280,000 24,000 89,300 3.71 4.28 36,900 12,000 19,600 .8J3 .91 July...... 53,500 8,400 18,200 .756. .87 29,400 8,400 14,600 .606 .70 September...... 9,600 5,040 6,920 .209 .23 The year...... 280,000 5,040 . 32, 100 1.33 17.99 1919-20. 22,300 4,940 10,700 .444 .51 118.000 16,100 43,200 1.79 2.00 70,600 19,000 34,300 1.42 1.64 20,000 9,000 12,700 .527 .61 18,000 7,500 13,000 .539 ,58 March...... 406,000 12,000 140,000 5.81 6.70 90,000 38,900 60,300 2.50 2.79 53,500 14,700 28,700 1.19 1.37 57,700 10,800 19,100 .793 .88 July...... 57,700 8,400 14,200 .589 .68 40,900 8,400 16,700 .693 .80 29,400 9,000 15,500 .643 .72 406,000 4,940 34,100 1.41 19.28 CHENANGO RIVER NEAR CHENANGO FORES, BT. T. LOCATION. About 1J miles below Tioughnioga River, 2 miles by road below Chenango Forks post office, Broome County, and 11J miles above Binghamton and the mouth. DRAINAGE ABBA. 1,420 square miles (revised measurement by State Conservation Commission of New York). See "Diversions." RECORDS AVAILABLE. November 11, 1912, to September 30, 1920. GAGE. Stevens water-stage recorder on the left bank on the farm of Erastus Ingraham, DISCHARGE MEASUREMENTS. Made from cable about 100 feet above the gage, or by wading. CHANNEL AND CONTROL. Sand, gravel, and small cobble stones; practically per manent. EXTREMES OF DISCHARGE. Maximum stage from water-stage recorder for year ending September 30, 1919, 8.1 feet at 7.50 a. m. October 31 (discharge, 11,800 second- feet); minimum stage from water-stage recorder, 2.46 feet at 3 p. m, September 30 (discharge, 194 second-feet). Maximum stage from water-stage recorder for year ending September 30, 1920, 11.33 feet at 3 p. m. March 27 (discharge, 24,300 second-feet); minimum stage from water-stage recorder, 2.47 feet, 2 to 6 p. m. October 1 (discharge, 198 second- feet). 1901-1920: Maximum stage recorded, 13.7 feet on the afternoon of March 27, 1913 (discharge, 35,500 second-feet); minimum stage recorded, 2.20 feet several times in August and September, 1913 (discharge, 92 second-feet). ICE. Stage-discharge relation affected by ice. SUSQTJEHAETFA BIVER BASIJT. DIVERSIONS ;---The run-off from 87.3 square miles at head of Chenango .River and from 15.7 square miles at head of TioughnJoga River is stored in reservoirs and, except for discharge over the spillways, is diverted out of the drainage area to the Erie Canal. The above-mentioned drainage area for Chenango River does not include these two areas. ACCURACY. Stage-discharge relation practically permanent; affected by ice for much of the period December, 1919, to March, 1920. Rating curve well defined between 120 and 35,000 second-feet. Operation of water-stage recorder fairly satisfactory throughout both years. Daily discharge ascertained by applying to the rating table, the mean daily gage height determined by inspecting gage-height graph or for days of considerable fluctuation, by averaging the discharge for intervals of the day. Records good except for periods when stage-discharge relation was affected by ice, for which they are fair. Discharge measurements of Chenango River at Chenango Forks, N. Y., during the years ' ending Sept. 80, 1919 and 1920.. Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. See.-ft. 1920. Feet. Sec.-ft. Jan. 21 C. C, Covert...... 3.63 1,400 Jan. IS o3.87 57g May 7 J.W.Moulton...... 4.35 2.370 Feb. 14 04.21 516 12 .....do...... 6.69 7.730 Mar. 9 .....do...... 06.78 3,420 2.82 381 22 6.16 6,130 Aug. 25 2.78 362 2.92 f>nA Dec. 22 Otto Lauterhabn...... a 5. 41 1,350 « Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Chenango River near Chenango Forks, N. Y:,for the years ending Sept. SO, 1919 and 19W. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 1,320 9,700 '1,090 2,650 1,270 6,480 2,880 2,610 1,340 375 1,120 368 2...... 1,420 7,370 994 6,830 1,180 5,890 2.700 2,970 1,210 352 970 345 3...... 1,660 3,350 1,030 5,310 1,260 3,650 2,790 2,700 1,080 338 805 368 4...... 1,520 2,610 1,140 3,860 1,210 3,060 4,280 2,270 994 322 700 368 5...... 2,100 2,100 1,220 2,970 1,190 3,450 5,070 2,970 904 309 631 360 6...... 2,610 1,940 1,220 2,610 1,14CT 3,750 5,190 2,880 849 360 1,210 322 7...... 3,160 1,750 1,220 2,610 959 2,700 4,840 2,610 893 360 1,600 303 8...... 2,970 1,600 1,280 2,520 926 2,360 4,720 3,060 838 368 1,030 267 9...... 2,440 1,490 1,350 2,520 849 4,600 5,310 2,880 750 338 805 267 10...... 1,780 1,490. 1,490 1,940 904 9,340 5,430 6,690 740 330 670 261 11...... 1,560 1,499 1,630 1,940 805 6,050 6,700 10,000 720 368 602 255 12...... 915 1,280 1,940 1,780 860 4,060 9,700 7,650 670 414 520 255 13...... 948 970 3,750 1,560 794 3,450 8,210 7,370 622 438 496 261 14...... 772 970 5,550 1,600 1,270 2,790 6,310 5,310 584 382 454 242 15...... 772 1,160 7,370 1,590 3,550 2,270 4,840 4,060 556 375 430 267 16...... 750 1,160 6,050 1,530 2,520 2,670 4,170 3,550 521 383 414 261 17...... 750 2,180 4,840 1,380 1,630 5,800 4,610 3,650 650 1,310 382 255 18...... 730 8,210 3 750 1,430 1,460 6,310 4,390 4,840 700 816 406 246 19...... 730 6,570 2,270 1,450 1,180 5,430 3,750 3,450 564 602 521 250 20...... 730 4,840 1,940 1,360 1,090 3,960 3,160 2,790 564 496 926 250 21...... 794 3,450 1,860 1,300 1,020 3,550 3,060 2,520 574 487 660 232 22...... 1,220 2,610 2,240 1,300 959 3,160 2,700 2,520 555 504 496 267 23...... 970 2,270 4,840 1,460 970 2,610 2,270 4,260 496 3,380 430 285 24...... 760 2,020 3,860 4,160 982 2,360 2.360 4,960 454 1,720 360 297 25...... 915 1,690 5,180 3,220 994 2,100 2,880 4,720 430 948 360 285 26...... 1,070 1,560 5,190 2,520 1,320 .1,860 2,610 3,860 422 750 345 273 27...... 994 1,490 3,650 2J 180 1,120 2,000 2,610 2,970 414 4,910 338 255 28...... 750 1,350 3,080 2,100 1,090 6,190 3,060 2,440 462 7,310 303 242 29...... 882 1,190 2,520 1,750 3,960 3,350 2,020 454 3,170 322 224 30;...... 1,380 1,120 2,520 1,630 3,260 3,080 1,700 406 1,860 330 210 31...... 11.500 2.270 1.480 3.350 1.490 1.320 375 102721 23 WSP 501 -IT 258 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Chenango River near Chenango Forks, N. Y., for the years ending Sept. 30, 1919 and 1920~Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 219 3,860 2,610 1,100 460 420 9,100 3,450 512 375 744 538 2...... 224 4,390 2,100 1,000 440 420 8,500 2,970 470 368 804 564 3 " > . 228 2,790 1,760 950 440 420 7,930 2,610 446 330 546 470 4...... 232 2,270 1,390 900 440 420 6,180 2,440 438 297 438 414 5...... 214 5,310 1,480 850 460 5,800 2,100 470 970 375 352 6...... 232 3,550 1,480 750 460 6,570 1,860 521 261 352 390 7...... 220 2,700 1,410 750 460 5,310 1,630 521 ' -285 315 430 200 2,100 1,500 750 480 3,000 4,500' 1,530 470 279 291 430 300 1,780 1,840 750 460 3,400 3,860 1,480 430 273 303 430 10...... 280 1,460 4,180 750 500 3,400 3,450 1,350 390 255 550 430 11...... 260 1,490 2,500 750 500 3,200 3,160 1,790 375 242 3,260 700 12...... 255 2,790 1,860 700 480 5,500 2,970 2,270 352 255 3,400 1,460 13...... 255 3,350 2,230 700 500 16,000 4,860 1,600 338 297 1,890 4,060 14...... 285 2,610 3,910 650 550 17,000 6,570 1,340 470 285 2,710 2,440 15...... 285 1,940 2.490 650 500 12,100 4,720 1,190 422 297 2,180 1,660 16...... 330 1,780 1,620 600 500 10,300 5,430 1,070 382 315 2,520 1,090 17...... 512 1,560 1,600 600 460 13,800 5,680 970 430 309 4,960 1,120 18...... 512 1,480 1,500 550 500 15,000 4,280 893 1,450 279 3,700 970 19...... 512 1,380 1,400 500 480 11,500 3,550 849 1,310 422 4,330 750 20 406 1,230 1,400 480 500 8,500 3,060 816 948 456 1,620 650 21...... 390 1,050 1,400 550 480 8,210 2,970 915. 710 504 1,170 584 22...... 470 1,160 1,400 550 480 6,570 3,860 1,230 593 446 937 546 23...... 805 1,570 1,300 550 480 8,500 3,350 994 530 521 816 512 24...... 631 1,560 1,300 550 500 13,XXX) 3,350 838 478 1,890 690 478 25...... 538 1,390 1,200 550 500 17,000 3,260 783 521 985 574 454 26...... 470 2,500 1,200, 600 500 19,000 2,610 750 422 710 521 446 27...... 882 6,000 1,200 550 440 23,400 2,440 690 375 538 470 43Q. 28...... 1,460 5,310 1,200 550 420 19,400 4,060 650 345 438 422 640 1.780 3,650 1,100 500 420 13,400 4,960 612 360 375 454 805 30...... 1,600 3,350 1,100 460 12,700 4,060 555 375 345 530 1,320 21...... 2.540 1. 100 460 10.300 530 330 478 NOTE. Paper suppl/ for gage exhausted Oct. 6, 1919; discharge Oct; 7-11 estimated by comparison with record for Susquehanna. River at Conklin. Discharge, Oct 12 to Nov. 16, 1919, Sept. 6-18. 1920, determined from twice-dail ? readings of slope gage; Nov. 28 and 27,1919, b y comparison with Susquehanna River at Conklin. Discharge, Dec. 17,1919, to Mar. 4 and Mar. 8-13,1923, determined from gage heights corrected for ice effect by means of four discharge measurements and study of gage-height graph and weather records. Discharge Mar. 5-7, 1920, estimated at 1,200 second-feet, Monthly discharge of Chenango River near Chenango Forks, N, Y.,for the years 1919 and 1920. [Drainage area, 1,420 square miles.] Discharge in second-feet. Month. Per Run-off Maximum. Minimum. Mean. square in inches. mile. 1918-19. 11,500 730 1,640 1.16 1.34 9,700 970 2,700 1.90 2.12 7,370 994 2,850 2.01 2.32 6,830 1,300 2,340 1.65 1.90 3,550 794 1,230 .866 .90 9,340 1,860 3,950 2.78 3.20 9,700 2,270 4,230 2.98 3.32 May...... 10,000 1,490 3,800 2.68 3.09 June...... i...... 1.340 406 680 .479 .53 July...... 7,310 309 1,140 .803 .93 1,600 303 613 .432 .50 September...... 368 210 278 .196 .22 The year 11,500 210 2,130 1.50 20.37 1919-20. 2,540 200 565 .398 .46 6,000 1,050 2,580 1.82 2.03 4,180 1,100 1,730 1.22 1.41 1,100 460 665 .468 .54 550 420 476 .336 .36 23,400 420 9,010 6.35 7.32 April...... 9,100 2.440 4,680 3.29 3.67 May...... -...... 3,450 530 1,380 .972 1.12 1,450 338 528 .372 .42 July...... 1,890 242 427 .301 .35 4,960 291 1,370 .965 1.11 September...... 4,060 352 852 .600 .67 23,400 200 2,030 1.43 19.46 SUSQUEHANNA KIVEE BASIN. 259 TIO6A RIVER NEAR ERWINS, N. T. LOCATION. At highway bridge one-quarter mile below mouth of Canisteo River, near village of Erwins, Steuben County, and 3 miles above town of Painted Post, where Tioga and Cohocton rivers unite to form Chemung River. DRAINAGE AREA. 1,320 square miles (furnished by Mr. Robert O. Hayt). RECORDS AVAILABLE. July 12, 1918, to September 30, 1920. GAGE. Chain near left abutment, downstream side of bridge; read by Miss Jane Sexton and Loren King. DISCHARGE MEASUREMENTS. Made from bridge or by wading. CHANNEL AND CONTROL. Bed composed of well-compacted gravel; probably per manent. EXTREMES OF DISCHARGE. Maximum stage recorded for year ending September 30, 1919, 16.4 feet at 4 p. m. May 22 (beyond the limits of present rating curve); , minimum stage recorded, 1.10 feet at 5.30 p. m. September 29 and morning and afternoon readings, September 30 (discharge, 100 second-feet). Maximum stage recorded for year ending September 30, 1920, 15.0 feet on morning of March 11 (beyond present limits of rating curve); minimum stage recorded, 0.90 foot July 18 (discharge, 50 second-feet). 1918-1920: Maximum stage recorded, 16.4 feet at 4 p. m. May 22, 1919 (beyond the limits of present rating curve); minimum stage recorded, 0.90 foot July 18, 1920 (discharge, 50 second-feet). ICE. Stage-discharge relation affected by ice. REGULATION. Storage not sufficient to affect the seasonal flow. ACCURACY. Stage-discharge relation practically permanent during both years, except as affected by ice December 16,1919 to March 6,1920. Rating curve fairly well defined from 100 to 200 second-feet and well defined from 200 to 13,000 second- feet; extended beyond these limits. Gage read to quarter-tenths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Open-water records good; records for period of ice effect and when gage was not read, fair. COOPERATION. Station established by the Lamoka Power Co. under the direction of the United States Geological Survey. . Maintained by the Survey in cooperation with the power company and the State of New York. Discharge measurements of Tioga River near Erwins, N. Y., during the years ending Sept. 80, 1919 and 1920. Gage Dis Gage Dis Date. Made by , height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1919. Feet. See.-ft. Nov. 21 3.38 1,770 May 12 J. W. Moulton...... 8.38 12,000 21 .....do...... 3.36 1,710 26 5.84 5,900 1919. 1920...... do...... 2.27 798 ol.83 145 Mar. 6 .....do...... 3.97 2,680 20 Lattterhahn and Covert ol.85 167 Apr. 4 J. W. Moulton...... 3.43 1,920 Feb. 17 01.95 209 13 4.97 4,300 Mar. 23 .....do...... 4.79 3,800 15 .....do...... 3.74 2, 170 1.48 263 21 .....do...... 3.47 1,900 10 1.47 256 o Stage-discharge relation affected by ice. 260 SUEFACE WATER SUPPLY, 1919-1&20, PART I. Daily discharge, in second-feet, of Tioga River nearBrwins, N. Y'.,for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 562 1,840 anK 700 wn 2,920 1,620 940 1,200 548 820 660 2...... KAA 1,280 dQ9 3 AQA con 1,730 1 san 1 '986060 1 060 450 740 513 3...... 1,100 1,060 eon 1,730 1,330 1,420 AAfl QAA 648 583 4...... 1,100 980 «M **TO 1,2.00 1 7^ft QOA 00A one 457 478 5...... QOA 1,100 *U1 414 1,100 2 9in 980 780 419 420 432 6...... 4 QQft 1,020 KO7 2 340 1 Qftrt Qnn 700 OJQ 860 AX\O 7...... 2 g^Q 860 478 1,420 1,620 QOA Old 348 8...... -- 1*520 780 534 980 ^79 1,380 5,370 940 1,100 426 700 °.19 | 1 CA 7AA 3 750 4 QQA 940 ww 270 10...... -.-. 940 660 1,020 QOA 4' 990 4 OOA 19 Ann 1,100 AfV7 260 OCA 11..-..----. 780 625 780 QQA 2,930 5 f7Of\ 11 iftrt 49K 396 19 700 KQA 740 QAA 260 1 QAA 7.010 11,500 660 OCA 13 625 KA1 QOA, OCA 1,730 4,090 6,160 *&tn OAA KOA 14...... 660 1,420 ftKfi 1,240 OAA OCA 15.....-.--- 576 47fi 2,620 7dn 1,420 1,100 2,770 457 270 94A 16....--.-.- 648 464 1,960 1 1 VI 215 400 1,200 1,520 590 17....:.---. 49ft 1 420 1,060 3,240 4,450 700 205 10 464 6,160 l' len 820 AOK 2,770 tge 408 3 QOA 1,020 414 2,210 4oo 190 OA OQA 2 olA QAA 2,210 7 *ou 4n l'420 24...... Q7Q i 7OA CAA OOA 2,620 OQA QftA 00 K 22....--..-- 1,420 l'520 owu 2,620 oq oe>( 1 94n 1 840 QOA Ifift ojo 1^380 1,280 625 24.....--.-. '940 i*^an 471 1,200 1,200' X. ffVa 348 25-...... 348 I OQA 1,200 414 900 630 26-...-...-. 31$ QOA i ^an 590 5,370 740 830 230I-RS 97 348 660 1,020 1,200 1,620 C0A 28...... ^*v± 980 do EJ.1 29...... 366 660 7QA 7OA 1 960 1,200 2 OSO 740 499 109 30...... 700 700 625 I'TVI 1,100 1^730 CQA 438 100 31...... 2 jon 1,420 940 1919-20. 1...... 1 ^IfiA 1 960 140 170 n/u\ 2 ^Af\ QAA 112 348 134 2...... 1KA 5,960 i'^Wft 140 1 VI onA 1,620 QQA 109 306 127 3...... QQA 1 PLA ^flH 109 85 2,920 150 ton 200 1,420 263 112 1 OAfl 900 300 1 240 OOA QQ 235 85 5...... qpLt 4 090 QOA 120 140 600 1 ' 7AA 1* 1 5A 354 100 200 88 6...... 1^4 2 080 1,060 QA 170 1-,200 oftn RIO 73 175 103 7...... i ^n 1,620 1 060 95 140 2,080 QAA 464 m 170 1,330 120 120 2 77A 820 414 79 366 134 7QA i^n OJO 9KA ton 1,150 100 5,560 780 118 10...... 1,020 i 7<>A 90 1 VI 24 490 740 J-IQ lAa 235 112 11...... 190 OAft 1 060 idft 35,000 1,330 OOA oc^» 103 980 146 12...... OKA 1,100 ' KQA idn 160 21,600 1 330 1,020 oje 660 700 iq o<2A 1 240 1,520 130 ISft 10 onn 2' 080 1 240 225 CO 485 2,480 14...... 270 1 'QOA060 °. "y*n 140 4,810 9 AREA l'420 276 70 450 820 15...... 265 1,620 160 140 4 450 1,620 QQA ortft 85 478 541 QOA- 16...... 270 1 CA i=;n S Ojin 1,730 fiAA OKA 68 700 390 17...... 900 740 120 200 4,450 2,620 740 294 68 980 255 1 ft 780 700 160 220 6,370 2 AQA 780 CQfl 56 3,240 220 19...... 660 900 120 200 4 090 1,620 780 700 235 1 240 166 OA 450 JQO 427 160 160 5' win 1,420 fiAA CAfi 444 ' 7«A 142 21...... --. 450 534 160 140 1,420 1,700 384 220 583 134 00 °.Qn 520 160 140 1,620 2.620 276 175 485 112 23...... 384 534 180 220 1,380 1,280 276 150 396 112 24...... 360 583 160 220 1,420 1,020 265 19,500 336 97 25...... 360 590 140 150 4,540 1,200 920 220 4,990 294 100 26 336 562 160 140 140 1,100 800 190 1,730 235 112 27...... 336 9,110 160 130 190 980 175 1,100 175 103 28...... 780 160 180 190 576 175 820 200 142 90 1.240 1 840 175 2,480 534 146 569 175 190 °.n 860 2^210 150 160 2,480 450 166 478 158 600 di...01 ...... 820 140 140 OAA 366 146 NOTE. Discharge, Tec. 26,1919, to Mar. 6, 1920, determined from gage heights corrected for ice effect by means of three discharge measurements ana study of gage-height graph and weather records. Discharge for following periods when gage was not read, estimated from the record derived by subtracting the dis charge of Cohocton River near Campbell from that of Chemung River at Chemung: Jan. 10-14. Feb. 11-13, Apr. 25, Aug. 25-27, Dec. 16-25,1919, Mar. 21-31, April 1-10, May 20,21,25, and 26,1920. Discharge, Sept. 30,1920, estimated from gage-height hydrograph. EIVEE BASIN. 261 Monthly discharge of Tioga River near Erwins, N. Y., for the years ending Sept, SO, 1919 and 1§20. [Drainage area, 1,320 square miles.] Discharge in second-feet. iRas-off ' Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 4,990 312 864 0.655 0.76 November...... 6,160 432 1,200 .; .909 L01 2,620 478 1,010 .765 -.88 3,080 506 1,000 Si .87 February ...... 1,420 250 498 .39 March...... 5,960 980 2,110 1.60 1.84 April:...... 7,010 1,100 2,580 2.1« May 38,000 820 7,040 6.14 2,620 414 850 !e44 .72 July...... 2,770 294 772 * 585 .67 1.840 270 705 .534 .62 660 100 287 .217 .24 38,000 100 1,590 1.30 16.32 1919-20. 1,240 85 400 .303 .35 9,110 492 1,790 1.36 1.52 3,580 140 812 .615 .71 January...... 180 90 140 .106 .12 220 120 165 .125 .14 March ...... 35,000 200 6,140 4.65 5.36 2,620 980 1,740 1.32 1.47 May...... 2,620 390 1,050 .795 .92 700 146 326 .247 .28 July...... 19,500 56 1,040 .788 .91 3,240 146 507 .384 .44 2,480 85 290 .218 .24 35,000 56 1,210 .917 12.46 CHEMtTNG RIVER AT CHEMITWG, W. 7. LOCATION. At new highway bridge about midway between Chemung, Chemung County, N. Y., and Willawana, Pa., half a mile upstream from State line and 10 miles above mouth. DRAINAGE AREA. 2,440 square miles. RECORDS AVAILABLE; September 11, 1903, to September 30, 1920. GAGE. Tape gage at the upstream side of the right span of the bridge; read by Di L. Orcutt. DISCHARGE MEASUREMENTS. Made from the bridge or by wading. CHANNEL AND CONTROL. Sand and gravel; occasionally shifting.. EXTREMES OF DISCHARGE. Maximum stage recorded for year ending September 30, 1919, 16.72 feet at 6.30 a. m. May 23 (discharge, 57,900 second-feet); minimum stage, 1.92 feet at 5 p. m. September 29, and at 7 a. m. and 5 p. m. September 30 (discharge, 266 second-feet). Maximum stage recorded for year ending September 30, 1920, 17.18 feet at 1 p. m. March 13 (discharge, 61,200 second-feet); minimum daily discharge, 160 second-feet January 8. 1903-1920: Maximum stage recorded, 17.96 feet at 7 a. m. March 15, 1918 (dis charge, about 67,000 second-feet); minimum stage recorded, 1.47 feet at 7 a. m. August 14, 1911 (discharge, about 49 second-feet). ICE. Stage-discharge relation affected by ice. REGULATION. Power is developed above the station, the largest plant being at Elmira, N. Y. 262 SURFACE WATER SUPPLY, 191£-1920, PAET I. ACCXTUACY. Stage-discharge relation practically permanent, except aa affected by ice December 17, 1919, to March 11, 1920. Rating curve well defined between 200 and 45,000 second-feet. Gage read to hundredths twice daily. Daily dis charge ascertained by applying mean daily gage height to rating table. Open- water records good; records for period of ice effect, fair. Discharge measurements of Chemung River at Chemung, N. Y., during %ffie years ending Sept. 30, 1919 and 1920. X Dis Gage Dis Date. Made by height. charge. Date, Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-/*. Jan. 22 E. D. Burchard...... 3.17 1,270 Jan. 19 Covert and Lauterhahn <>3.03 261 May 6 J.W.Moulton...... 3.76 1,910 Feb. 15 03.38 430 O QJ, 1,380 Mar. 8 .....do...... 07.56 3,480 Aug. 23 3.04 1,090 30 .....do...... 5.43 '5,070 June 11 Howe and Lauterhahn. 2.34 586 o Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Chemung River at Chemung, N. Y.,for the years ending Sept. SO, 1919 and 1920* Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. !...... ». 960 4,040 960 1,250 790 1,540 3,460 2,140 2,600 915 670 870 2...... 870 2,440 790 2 7fift 710 4,240 2 7fift 2,440 2,140 790 915 710 3...... 1,150 2,000 870 3,840 710 2,290 2,600 2,290 1,860 710 750 574 4...... 2,000 1,730 830 2,290 Q7A 2 nnn 2 930 1,8% 1,730 623 609 630 5...... 1,360 1,540 790 1,600 750 2,000 4 240 1,880 1,540 KQC 567 532 6...... 3 460 1,730 790 1,860 3,100 4 040 2,000 1 3AA 630 553 490 7...... T ttfirt 1,420 710 2,440 cco 2,600 3'lAA 1,730 2 rtAn eft7 1,000 464 8...... 6 240 1 250 750 2,290 630 2,140 5,300 1,830 2 AAf\ 750 960 419 9...... 4,650 1,150 915 2,290 490 3,280 8 1 An 2,000 i ftfirt 609 750 383 10...... 4 040 1,730 1,880 K0f\ 11,400 6,750 12,800 2,930 firqo 602 354 11...... 3,650 1,000 1,300 1,600 458 5,530 11,700 28,000 2,140 518 539 332 12 1,420 960 1,200 2,000 ASfl 4,240 14,600 20,000 1,600 710 484 343 13...... 1,100 915 1,250 2,000 J.ftl 3,280 9 380 15,700 1,420 623 444 326 14...... 1,100 830 1,730 1,540 609 2,600 6,750 9,060 1,150 560 419 332 15...... 1,000 790 3,840 1,540 1 QHrt 1 RftA 5,080 6,490 1,050 CQQ 395 343 16...... 1,050 750 4,240 1,480 1,600 2,000 5,530 5,300 1,000 525 383 326 17...... QIC 710 2,930 1,480 1,100 5,530 8 Ten 5,300 1,250 1 J 790200 560 321 18...... 710 3,280 2,290 1,360 8,140 6,000 8,440 1,250 1,360 299 19...... 670 6,490 1,860 1,-480 7%n 7,560 4,650 4,650 1,000 670 1,660 282 20...... 630 4,440 1,540 1,250 790 4,650 3 QJA 6,000 870 630 1.800 238 21...... 630 1,420 1,250 G7n 3 840 3 JAA 20,000 980 ofin 1,300 277 22...... 616 2,600 1,420 1,200 790 3,460 3 o on 44,800 1,730 1,860 1,000 277 23...... 630 2,290 2,000 1,250 750 3,100 2,600 53,500 1,100 1,000 310 24...... eot 1,860 1 360 790 2 440 2 OQA 32,000 870 2 rtAn 790 377 25...... EJR 2,140 790 2 140 2,600 24,800 790 1,300 670 438 26...... 574 1,360 2,440 1,730 870 1,880 2,290 14,200 710 1,000 750 371 27...... 546 1,150 2,000 O1 ^ 1 7^ft 2,290 9,060 Ton 830 710 310 28...... 574 1,050 1,600 OQA 2,290 6,490 2,600 1,480 588 310 29...... 602 1,000 1,420 1,200 4 040 2 440 4,860 1 EJA Q1 f\ 560 272 30...... 630 1,000 1 f> e\f\ 1 1 ^ifl S JflA 2*440' 3,650 1,100 750 574 266 31...... 1,860 1.100 870 4.240 3.100 670 546 EIVER .BASIN. Daily discharge, in seesnd-feet, of Ghemung RiDer at Chemung, N. Y., for the years ending Sept. 30, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr, May. June. July. Aug. Sept. 1919-20. 1...... 246 T 3,100 180 240 380 3,280 2,440 670 * 332 830 438 .2...... 227 4*880 2,000 180 280 400 2,930 3,100 630 288 no 389 3...... 241 5^300 1,540 180 300 400 2,760 2,440 623 630 670 365 4...... ;... 232 2,930 1,200 280 , 300 420 2,440 2,140 574 343 588 338 5...... 236 4,040 1,100 260 320 900 2,290 1,860 588 310 646 326 6...... 227 3,460 870 220 280 4,600 4,240 1,600 616 277 504 326 7...... 23fr 2,440 1,100 190 360 8,000 3,460 1,480 750 266 464 343 8...... 232 2,000 1,100 160 360 4.000 3,280 1,300 670 277 484 . 326 9...... 266 1,730 1,050 170 380 3,000 2,600 1,250 602 246 670 354 10...... 288 1,480 1,420 200 400 2,600 2,290 1,150 560 299 609 365 11...... 260 1,300 2,290 260 420 9,500 2,140 1,200 511 288 1,200 354 12.... 288 1,200 1,100 280 420 35,600 2,000 2,440 484 299 1,420 870 13...... 299 1,360 1,600 280 440 59,900 2,760 2,600 451 282 1,000 1,600 14...... 407 1,480 4.240 320 420 19,600 4,240 1,860 438 277 1,000 1,730 45...... 377 1,200 2,930 380 480 9,700 2,930 1,540 438 260 870 1,050 16...... 377 1,050 1,150 340 340 9,380 2,600 1,360 464 236 1,000 790 17...... 401 960 600 320 440 28,000 3,460 1,250 444 241 1,360 616 18...... 870 915 460 OOA 440 13,100 3,650 1,100 =axi 227 7,850 525 19...... 710 870 800 280 420 Q rtfift. 2,760 1,000 Ton 438 3,650 ' 458 20...... 567 790 650 4Ofl 480 2,290 960 7CA 407 2,140 401 21...... 490 TV\ 500 320 420 4,860 2,000 1,480 630 630 1,540 371 22...... 464 710 460 280 440 5 EQA 2 OQA 3,650 coo 470 1 200 354 23...... 425 710 420 inn 440 6,750 2,290 2,760 477 616 1,000 343 24...... 458 710 340 320 420 9 380 2,290 1,860 444 13,500 870 332 25...... 432 710 340 onA 420 10^700 2 AAA 1,480 ilQ 15,300 750 299 26...... 413 7KA 4 an OQfl 400 11,000 1,730 I Ofifl OQQ 4.440 670 310 27...... 401 8 11A 420 320 320 12,800 1 ASfl 1 1ttf\ ^£4. 2,600 560 299 28...... 525 5,080 260 320 400 8 idn 2 nnn 1,050 348 1,730 546 3S9 29...... 1,000 2 QOA 280 QAft OQA 6,000 3,650 915 QO1 1,360 504 518 30...... 1,050 2' 600 260 300 4,860 2,930 790 <171 1,050 490 616 31...... 91S 190 280 3,840 710 870 464 NOTE. Discharge, Dec. 17,1919, to Mar. 11,1920, determined from gage heights corrected for ice effect by means of three discharge measurements and study of ga?e-height graph and weather records. Discharge Mar. 28, 1919, estimated from records of flow of Susquehanna River at Conklin and Chenango River at Chenango Forks. Monthly discharge of Chemung River at Chemung, N. Y,, for the years ending Sept. SO, 1919 and 1920. [Drainage area, 2,440 square miles.] Discharge in second-feet. Month, Per Run-off Maximum. Minimum. Mean. square in inches. mile. 1918-19. October...... 7,560 546 1,690 0.693 0.80 November...... 6,490 710 1,870 .766 .85 4,240 710 1,630 .668 .77 3,840 870 1 710 .701 .81 February...... 1,600 458 783 .321 .33 March ...... 11,400 1,540 3,730 1.53 1.76 April...... 14,600 2,290 4,860 1.99 2.22 May...... 53,500 1,730 11.500 4.71 5.43 June...... 2,930 710 1,510 .619 .69 July...... 3,370 518 923 .378 .44 1,800 383 771 .316 .36 870 266 394 .161 .18 The year...... 53,500 266 2,640 1.08 14.64 1919-20. October...... 1,050 227 437 .179 .21 8,140 710 2,140 .877 .98 4,240 190 1,100 .451 .52 380 160 272 .111 .13 480 240 385 .158 .17 59,900 380 9,970 4.09 4.72 April...... 4,240 1,480 2,700 1.11 1.24 May...... 3,650 710 1,650 .676 .78 790 321 528 .216 .24 July...... 15,300 227 1,580 .648 .75 7,850 464 1,170 .480 .55 1,730 299 526 .216 .24 59,900 160 1,880 .771 10.53 264 SURFACE WATEB SUPPLY, 1919-1920,, PART I. COHOOTON RIVEfe NEAR SAVONA. ST. 7. LOCATION. Just below highway bridge, 1J miles above Savona, Steuben County, and 4$ miles downstream from Bath. Mud Creek enters from left 1.4 miles below DRAINAGE AREA. 383 square miles (furnished by Mr. Robert 0. Hayt). RECORDS AVAILABLE. March 1 to December 8,1919, when station was discontinued. GAGE . Sloping and vertical staff. Slope gage supported on concrete pier in left bank, about 200 feet downstream from highway bridge. Vertical section spiked to downstream side of 12-inch ash tree about 15 feet back from edge of bank; reid by Kenneth D. Ward. DISCHARGE MEASUREMENTS. Made from cable or by wading. CHANNEL AND CONTROL. Firmly bedded gravel; not likely to shift. EXTREMES OF DISCHARGE. Maximum stage recorded during period of record, 9.18 feet at 6.30 a. m. May 23 (discharge, 6,900 second-feet); minimum stage, 1.6 feet at 7 a. m. and 5 p. m. several days in September and October (discharge, 33 second- feet). REGULATION. Seasonal distribution of flow is probably not affected by small reser voirs above. ACCURACY. Stage-discharge relation practically permanent during period of records. Rating curve well defined between 40 and 6,000 second-feet. Gage read to quarter-tenths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Records good .except those for extremely low stages, which are fair. COOPERATION. Station established and maintained by the United States Geological Survey in cooperation with the Lamoka Electric Power Corporation (Robert O. Hayt, chief engineer). Discharge measurements of Cohocton River near Savona, N. Y., during the period Jan» 27, 1919, to Mar. 23, 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. j 1919. Feet. Sec.-ft. 1919. Feet. Sec.-ft. Jan. 27 2,39 185 May 25 O.W. Hartwell...... 6.59 3.300 .....do...... 9 ftf\ July 26 2.05 88 3.32 528 2.20 129 13 5.02 1,710 Sept. 11 .....do...... 1.75 46.7 14 .....do...... 4.40 1,170 15 .....do...... 4.01 957 1920. 20 .....do...... 3 99 KOO Mar. 23 03.83 860 May 22 O. W. Hartwell...... 8.40 5,740 Gage height doubtful'owing to movement of gage by ice. :BIVER BASTST. 285 discharge, in wcdnd-feet, of Coho&on. River near JSavona, N. Y., during period Mar. 1 to Dec. 8,1919. Day. Mar. Apr. May. June. July. Aug. Sept, Oct, ,,NOTV Dec. 1...... :...... 650 358 595 470 125 00 68 33 247: 116 2...... ;...... 380 338 620 400 118 72 68 & »0 123 3...... 282 379 520 358 100 68 65 38 282 104 4...... 282 545 520 319 98 68 64 33 247 .107 5:...... 379 570 545 282 m 60 62 33 ^4T 104 ...... J 358 400 445 264 100 116 W 40 2i4 100 7...... 247 445 422 620 100 100 55 55 '155' W5 79 8...... 214 495 400 495 86 , 86 52 47 67 9...... 645 755 400 756 83 68 . 50 88 ins 10...... 71fi 1,520 3,200 755 79 53 47 33 98 11...... ItOR 2,060 3,790 545 80 52 46 33 ,.. 74 12...... 495 ?2,450 *:2,980* l jv 400 80 / 51 46, 35 57 18...... 445 t >}sn 2,060 319 116 ! 58 51 34 50 If ...... 247 1,280, 1,280 282 102 51 60 42 46 15...... 282 935 1,000 264 82 44 65 60 44 16...... 445 1,000 815 264 102 3$ 55 52 44 17...... fiM 875 1 '905060 470 100 79 51 48 42 18...... I '935B2o 672 282 98 152 dfi 38 38 19...... 595 700 247 98 141 42 42 48 30...... 7Q C 520 595 230 104 130 41 40 47 ' 47 21...... 645 520 5,270 214 247 102 35 - '44 22...... 545 422 5>700 179 138 on 52 40 43 23...... 445 oeo 6,000 164 136 67 48 43 53 24...... 400 545 4 444 149 125 65 42 41 51 25...... oeo 520 3,310 138 114 75 38 40. 47 26...... 319 520 2,150 158 98 64 38 50 86 27...... OOQ 495 1,440 282 Si 65 35 62 445 28 495 545 1,060 247 75 65 33 65 198 29...... 422 815 785 188 67 68 33 68 152 30...... 422 Aif; 645 149 65 79 33 68 128 31...... fiAK K1S 65 92 147 NOTE. Discharge, Mar. 1 and 2, estimated from records of flow of Cohoeton River near Campbell. Monthly discharge of Cohoeton River near Setvona, N. Y., during period Mar. 1 to Dec. 8, 1919. (Drainage area, 383 square miles.] Discharge in second-feet. Run-ofl Month. Per in inches. Maximum. Minimum. Mean. square mile. March...... 1,52) 214 510 1.33 1.53 April...... 2,450 338 779 2.03 2.26 May...... 6,000 400 1,750 457 5.27 755 138 330 .863 .96 July...... 247 65 102 .266 .31 152 38 77.2 , .203 .23 68 33 49.7 .130 .14 October...... 147 33 47.1 .123 .14 445 38 132 .345 .38 December 1-8...... 123 67 100 .261 .08 COHOCTON RIVER NEAR CAMPBELL, H. Y. LOCATION. At the highway bridge known locally as Red Bridge, 2 miles upstream from Campbell, Steuben County, midway between Campbell and Savona. DRAINAGE AREA. 480 square miles (furnished by Mr. Robert 0. Hayt). RECORDS AVAILABLE. July 11, 1918, to September 30, 1920. GAGE. Chain gage fastened to the downstream handrail of the bridge near the left abutment; read by Mrs. Lovena Wood. DISCHARGE MEASUREMENTS. Made from bridge or by wading. CHANNEL AND CONTROL. Firmly bedded gravel, not likely to shift. 266 SURFACE WAT1B SUPPLY, 191&-1920, PART I. EXTREMES OF DISCHARGE. Maximum stage recorded for the year ending September 30,1919, 7.75 feet at 7.30 a. m. May 23 (discharge, 9,280 second-feet); minimum stage recorded, 0.68 foot at 6 p. m. September 30 (discharge, 28 second-feet). Maximum stage recorded for the year ending September 30, 1920, 8.62 feet at noon March 12 during spring break-up (discharge, 11,300 second-feet); mini mi^'Stag^reeoliied,&flO Gage Dis Gage Dis Date. Made by height charge. Date. Made by height. charge. 1918. Feet. Stc.-ft. 1920. Feet. Sec.-ft. Nov. 21 1 94 611 ol.52 100 21 .....do...... 1.92 602 20 Covert and Lauterhahn 01.58 56 Dec. 28 C.C. Covert...... 1.46 298 Feb. 16 ol.38 48 1919. Mar. 7 .....do...... 03.02 544 Jan. 27 E. D. Burchard...... 1.23 225 23 .....do...... 2.53 1,020 Mar. 6 .....do...... 1.54 375 .....do...... 90 102 Apr. 4 J. W. Moulton ...... 1 97 630 10 .80 85 13 3 AK. 1 990 July 14 .71 48.4 14 .....do...... 3.07 I'eso 14 .....do...... 70 52 21 .....do...... fc«3< '666 Aug. 26 Laaterhalm and <>ver* 1.CO - 1*8 Hay 22 O.W. Hartwell...... 6.46 6,600 26 .....do...... 1.00 in 25 .....do...... 4 OH 3,900 Sept. 24 Aug. 22 1.07 147 .755 59 22 .....do...... 1.02 113 Sept. 11 91 OA o Stage-discharge relation affected by ice. Daily discharge, in second-feet, of Cohocton River near Campbell, N. Y. } for the period July 11, 1918, to Sept. SO, 1920. Day. July. Aug. Sept. Day. July. Aug. Sept. Day. July. Aug. Sept. 1918. 1918. 1918. 1...... 117 104 11...... 129 99 75 21...... 84 73 549 2...... 92 68 12...... 1U. 96 66 22...... 78 68 376 3...... 92 68 13...... 135 80 94 23...... 84 82 288 4...... 120 66 14...... 112 82 109 24...... 96 71 262 5...... 92 66 15...... 89 80 25...... 223 66 241 6...... 96 9* 16...... 108 80 7^ 28...... 158- ,7t . 331 7...... 112 117 17...... 101 80 138 27...... 109 68 312 8...... 99 84 18...... 99 73 178 28. 117 66 262 9...... 92 66 19...... 102 75 307 29...... 99 66 224 10...... 102 62 20. 96 71 688 30...... 141 73 189 31...... 138 73 " .- SUSQUEHANNA RIVER BASIN. 267 Daily discharge, in second-feet, of Cohocton River near Campbell, N. Y. t for the period July 11, 1918, to Sept. SO, 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 193 430 193 298 182 S25 -457 725 581 180 184 100 2...... 186 430 270 616 402 457 457 725 517 162 153 110 3...... 136 350 197 457 293 350 457 616 457 175 103 100 4...... , 193 336' 197 340 201 350 688 616 402 141 us 86 5...... 164 336 212 320 208 402 688 650 402 117 100 97 6...... in 288 161 320 197 402 650 517 '725350 175 250 110 7...... 208 257 249 400 232 307 650 549 121 68 8...... 201 241 216 500 236 298 650 517 581 141 117 56 9...... 201 249 549 400 208 762 915 517 688 125 114 56 10...... 182 224 430 480 147 955 1,700 2,900 955 103 65 li...... 158 220 430 460 182 688 1,500 4,220 725 166 Sfi 59 12...... 164 224 340 440 430 487 2,900 3,610 616 141 Q7 97 13...... 168 216 321 420 224 581 2,030 2,610 517 149 83 97 M...... 147 186 725 380 280 307 1.600 1,810 402 Oft 71 15...... 151 189 955 360 350 457 1,310 1,310 350 121 65 83 16...... 144 171 725 340 253 517 1,310 1,040 376 153 71 SO 17...... 135 182 616 320 280 1,130 1,130 1,600 457 141 250 90 18...... 138 1,400 487 300 186 1,810 1,220 1,220 376 121 260 on 19...... 138 1,040 402 345 175 1,130 762 955 305 114 345 77 -20...... 135 762 350 402 257 955 650 725 inn 114 o^e *U) 21...... 151 620 326 350 193 800 650 5,720 ws 153 ISfl 150 22...... 147 549 350 280 164 800 517 6,470 245 305 137 71 23...... 147 430 457 326 193 725 457 7,060 221 166 110 53 24...... 117 376 402 457 182 581 650 5,030 1R4 103 103 ^B...... 120 316 487 402 164 430 650 4,060 180 153 86 56 26...... 178 293 430 307 197 402 581 2,770 245 137 86 49 -27...... 189 270 280 298 171 402 838 1,920 402 125 121 44 28...... 158 236 331 241 457 616 725 1,310 350 117 86 40 29...... :.. 154 253 331 224 581 875 998 94ft 103 121 35 30...... 171 266 283 212 549 .725 838 198 90 103 30 31...... 762 326 171 650 688 110 ii;a 1919-20. 1...... 33 457 266 110 44 65 688 549 120 68 164 82 2...... 35 616 220 Q NOTE. Discharge, Jan. 5-18, 1919, estimated because of ice; Jan. 1 to Mar. 10,1920, determined from gage heights corrected for ice effect by means of four discharge measurements and stndv of gage-height graph and weather records. Gage not read for the following periods: Dec. 16-31,1919, discharge estimated from records of Tioga River near Erwins and Chemung River at Chemung; May 13-14 and Sept. 14-15, 1990, discharge determined from estimated gage-height graph. Backwater corrections May 26 to Sept. 30, 1920, determined by seven discharge measurements distributed throughout season. 268 SURFACE WATEB - SUPPLY, 191^-19aO>PAET I. Monthly discharge of Cohocton River near Campbell, N. Y.,for the period A^ng. 1,1918, to Sept. 30, 1920. [Drainage area, 480 square mites.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918. 120 66 84.4 0.176 0.20 September ...... 688 62 188 .392 .44 1918-19. 762 117 182 .379 .44 1,400 171 378 .788 *S& 955 161 388 .808 .8* 616 171 360 .750 .8& 457 147 237 .494 .51 March...... 1,810 298 632 1.32 1.52 April...... 2,900 457 946 1.97 Z.Wr May...... 7,060 517 2,070 4.31 4.97 955 180 422 .879 .98 July...... 305 90 143 .298 .34 August ...... 345 65 137 .285 .33: 110 30 73.0 .152 .17 The year ...... 7,060 30 500 1.04 14.13; 1919-20. 184 33 63.0 .131 .15 November ...... 616 138 286 .492 .55 581 207 .431 .80 110 46 68.3 .142 .16 100 44 75.1 .157 .17 March...... 7,680 65 1,630 3.40 3.92 April...... 725 307 472 .983 1.10 May...... 549 129 270 .562 .65 June ...... 193 62 99.3 .207 .23 July...... 2,930 51 221 .460 .53 815 82 186 .388 .45 164 51 81.6 .170 .19 7,680 33 303 .631 8.60 MTJD CREEK AT SAVONA, N. Y. LOCATION. On farm of L. R. Travis in Savona, Steuben County, half a mile above mouth. DRAINAGE AREA. 80 square miles (furnished by Mr. Robert 0. Hayt). RECORDS AVAILABLE. July 8, 1918, to December 31, 1919, when station was discon tinued. GAGE. Vertical staff fastened to timber planted in concrete at the waters edge on the left bank 150 feet upstream from farm bridge; read by L. R. Travis. DISCHARGE MEASUREMENTS. Made from farm bridge or by wading. CHANNEL AND CONTROL. Bed of stream composed of fairly well compacted gravel; not likely to shift. Considerable grass grows in stream bed affecting stage-discharge relation during summer. Control probably submerged by backwater from the Cohocton River during extreme floods. EXTREMES OF DISCHARGE. 1918-1919: Maximum stage recorded, 6.65 feet at 6.45 a. m. May 23, 1919 (discharge, 852 second-feet); minimum stage recorded, 3.25 feet at 8 p. m. September 30, 1919 (discharge, 4 second-feet). ICE. Stage-discharge relation affected by ice. REGULATION. Grist mills at Bradford, 7 miles upstream cause some diurnal fluctua tion in flow. ACCURACY. Stage-discharge relation affected by growth of grass in channel. July 8, to November 14, 1918, and July 1 to October 31, 1919; discharge ascertained by indirect method. Backwater from Cohocton River May 21-23, 1919. For the rest of the .record discharge ascertained by applying da!ly gage height to rating table except December 16-31.1919, when stage-discharge relation was affected by ice. Records fair. SUSQUEHANNA BIVEE BASIN. 269 COOPERATION. Station established by the Lamoka Electric Power Cev under the direction of the United States Geological Survey. Maintained by' the Survey in cooperation with, the power'company and the State of New York. Discharge measurements of Mud Creek at Savona, N. Y., during the year ending Sept. 30, 1919. Gage Dis. Gage Dis Date. Made by height. charge. Date. Ma4e by height. charge. Feet. Sec.-ft. Feet. Sec.-ft. Nov. 21 3 AQ 38.4 May 22 5.76 401 21 .....do...... 3.69 39.6 25 .....do...... 6.40 746 Jan. 27 .....do...... 3 so 30.5 26 .....do...... 5.90 "US Apr. 4 3.98 71 3.44 12.9 11 4 CO 919 Sept. llo 3 44 1O C 14 .....do...... 4.75 187 llrf .....do...... 3.44 13.7 15 .....do...... 4.66 170 20 .....do...... 4.02 72 a Considerable aquatic growth on control. Daily discharge, in second-feet, of Mud Creek at Savona, N. Y., for period July 8, 1918, to Dec. 31, 1919. Day. Julj . Aug . Sep t. Day. July. Aug. Sept ]Day. July. Ang. Sept. i 1918. 1918. ] L818. 1...... 18 20 11 24 17 12 21. 20 16 65 2...... 17 12 12 30 15 12 22. 16 16 30 3...... 15 13 13 24 15 20 23. 17 26 1Q 4...... 20 16 14 24 24 13 24. 32 14 19 5...... 18 14 15 19 15 15 25.. 65 12 19 6...... 20 13 16 19 22 8 26. 36 13 36 7...... 20 14 17 19 24 14 27.. 24 22 28 8...... 90 17 15 18 19 15 20 28. 18 14 20 9...... ?0 18 12 19 17 14 12 29. 17 15 20 10...... f6 24 13 20 22 15 90 30.. 24 15 14 31.. 24 14 Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19 1...... 20 34 25 36 29 46 57 73 63 25 21 15 2...... 16 30 26 57 33 28 62 66 66 25 25 16 3...... 15 26 33 48 29 28 54 63 66 24 18 23 4...... 20 20 29 48 27 29 66 63 60 24 12 16 5...... 14 24 26 40 26 37 73 71 63 22 13 28 6...... 14 22 24 31 26 36 63 63 57 26 47 15 7...... 17 20 36 29 28 36 61 59 136 22 21 8...... 15 20 29 33 23 27 63 61 86 25 24 11 9...... 13 20 38 36 25 80 70 80 86 31 99 or 10...... 12 22 29 29 25 120 300 106 19 19 17 11...... 16 22 27 32 25 66 240 435 144 22 15 14 12...... 22 24 36 25 26 54 270 510 120 20 18 14 13...... 20 20 35 29 22 54 216 510 86 17 14 21 14...... 11 20 51 f; 29 39 188 365 66 15 14 15...... 12 20 67 41 33 | 35 170 161 56 17 13 11 16...... 14 17 58 31 26 71 170 106 67 19 12 12 17...... 11 22 44 33 29 128 170 128 73 17 50 11 18...... 13 106 36 36 26 136 144 120 53 14 31 9 19...... 12 73 32 35 22 86 128 92 41 14 34 11 20...... 14 cn 29 00 28 80 WO 67 /to 15 29 11 21...... 11 41 33 33 25 80 86 220 oe 18 21 15 22...... 18 36 37 33 25 179 80 360 35 29 18 11 23...... 12 36 46 37 26 161 68 700 oo 17 15 12 24...... 13 31 42 46 25 106 80 705 29 15 18 21 25...... 13 29 40 40 26 57 71 741 9Q 14 13 26...... 17 31 42 33 25 45 73 38 13 19 7 27...... 17 31 33 35 29 56 68 270 44 14 22 10 28...... 12 25 33 31 32 86 71 12 17 29...... 19 29 36 31 71 73 99 33 21 20 5 30...... 20 32 31 68 68 Tl 28 14 18 4 31...... 65 35 25 73 68 13 21 270 SURFACE WATER SUPPLY, 191&-1920, PART I. Daily discharge, in second-feet, of Mud Creek at Savona, N. Y.,for period July 8,1918., to Dec. 31, 1919 Continued. Day. Oct. Nov. Dec. Day. Oct. Nov. Dec. Day. Oct. Nov. Dec. 1919. 1919. 1919. 1...... 11 30 27 11...... 10 22 28 21...... 19 11 2...... 9 51 22 12...... 24 27 22...... 10 14 3...... 17 33 29 13...... 9 22 40 23...... 12 16 4...... 11 40 23 14...... 26 46 24.....;... 8 16 5...... 12 42 26 15...... 8 27 39 25...... 8 31 6...... 21 35 17 16...... 11 ?A 26...... 8 33 10 7...... 16 34 22 17...... 15 16 27...... 7 38 8...... 10 36 17 18...... 11 20 1 10 28...... 12 29 9...... 8 23 29 19...... 20 16 29...... 14 26 10...... 8 20 28 20...... 20 20 30...... 16 32 31...... 20 NOTE. Discharge, Dec. 16-31,1919, estimated because of ice by comparison with record of flow of Cohoc- ton River near Campbell. Monthly discharge of Mud Creek at Savona for period Aug. 1, 1918, to Dec. 31, 1919. [Drainage area, 80 square miles.] Discharge in seeond-feet. Run-off Month. Per in Maximum. Minimum. Mean. square inches. mile. 1918. 23 12 17.4 0.218 0.25 September...... 90 8 20.9 .261 .29 1918-19. 65 11 16.7 .209 .24 106 17 31.1 .388 .43 67 24 36.1 .451 .52 25 35.2 .440 .51 i 22 26.8 .335 .35 179 27 70.9 .886 1.02 April...... ;...... 270 54 107 1.34 1.50 May...... 745 59 236 2.95 3.40 144 28 62.5 .781 .87 July...... 31 12 19.1 .239 .28 50 12 21.1 .264 .30 28 4 13.9 .174 .19 745 4 56.7 .709 9.61 1919. 21 7 12.3 .154 .18 51 11 23.9 .336 .37 18.7 .234 .27 SUSQTJEHA5TNA BXVEB BASIN. 271 TFWKHAHNOCK CREEK AT DIXOBT, FA. LOCATION. At single-span steel highway bridge at Dixon, Wyoming County, 2 miles east of Tunkhannock. DRAINAGE AREA. <393 square miles. RECORDS AVAILABLE. January 28, 1914, to September 30, 1920. Records prior to- October 1,1918, are contained in the annual reports of the Water Supply Commis sion of Pennsylvania. * GAGE. Chain gage attached to the upstream side of bridge; read by N. L. Kneller. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL.-^The'right baak isthigh/ steep,»attdianot overflowed; the left is low but not subject to overflow. Bed is composed of coarse gravel. Control is. at a riffle, where the bed is composed of boulders, about 300 feet below, gage; permanent. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Septem ber 30,1919, 5.32 feet at 8 a. m. April 12 {discharge, 3,170 second-feet) j'minimum, stage, 1.18 feet several days in July (discharge, 30 second-feet). Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 10.0 feet at midnight March 12-13 (discharge, about 10,500 second- . feet); minimum stage, 1.28 feet October 1 and 5 (discharge, 42 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent except as affected by ice Decem ber 16,1919, to March 12,1920, Rating curve wsU defined-between 100and4,OQ0; second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good. Discharge measurements of Tunkhannock Creek at Dixon, Pa., during the years ending- Sept. 30, 1919 and 1920. Oage Dis Gage Dis Date. Hade by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sfc.-ft. Aug. 27 1.66 128 2.26 135 Oct. 10o 1.60 103 Apr. 6 3.50 1,32O May 14 .....do...... 2.41 438 1920. Sept. 24 1.92 239 Jan. 8» .....do...... 1.91 174 a Measurement made by wading 300 feet above gage. & Measurement made through incomplete ice cover. c Measurement made through complete ice cover. 272 SURFACE WATEB SUPPLY, 1919-1920, PAET I. Daily discharge, in second-feet, of Tunkhemnocb Creek at Diz&n, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June July. Aug. Sept. 1918-19. 1...... 345 910 188 540 250 1,500 540 395 152 52 188 90 272 665 152 1,700 225 840 450 735 149 50 166 80 3...... 570 540 166 1,030 208 665 480 510 132 38 100 80 4...... 480 510 169 875 225 600 805 422 138 33 82 76 5...... 345 630 169 630 200 600 805 395 114 31 76 80 e...... 1,500 480 149 630 149 665 770 370 114 46 600 64 7...... 1,900 395 111 630 155 480 600 370 152 76 875 47 0 1,030 370 155 TOO 162 422 770 422 120 52 480 54 I::::::::::::: 805 345 208 630 1 138 1,700 1,190 450 108 38 272 129 10...... 639 296 162 450 111 1,800 875 1,800 111 46 213 105 11...... 480 250 149 422 129 1,070 770 1,600 92 70 162 120 12...... 422 216 216 295 129 840 2,560 1,230 92 76 129 142 13....-...... *. 480 200 250 295 120 735 1,410 1,070 88 57 114 111 14...... 305 185 378 295 272 570 1,150 805 76 52 92 85 15...... 345 185 540 345 570 540 875 665 114 43 85 SO 16...... 272 185 422 320 422 875 1,150 570 132 46 480 64 17...... 250 185 345 295 204 2,010 2,230 540 950 42 200 68 18...... :,. 204 1,150 295 395 242 1,900 1,410 570 320 46 181 80 1Q 14Q 1,150 246 395 152 1,320 1.070 422 188 36 177 64 20...... 162 770 212 345 149 1,110 840 345 138 68 120 68 21...... 272 600 216 14 i 155 950 805 345 510 221 100 60 22...... 229 510 242 345 192 770 630 376 181 272 90 62 23...... 169 395 1,700 370 192 600 540 600 128 422 85 92 24...... 142 ^* 1,230 1,500 204 540 540 540 100 188 74 108 25...... 111 345 1,150 600 212 450 540 510 88 120 173 92 26...... 200 272 805 540 510 395 422 422 76 90 162 60 27...... 272 246 600 510 295 395 450 320 82 242 100 50 28...... 200 229 510 422 242 735 450 272 108 145 129 id. 29...... 185 272 422 SQS 805 510 233 57 117 10Q It 30...... w\n 272 345 345 700 422 192 62 92 92 44 31...... 1,320 295 295 665 162 76 76 1919-20. 1...... 44 450 840 110 80 130 1,410 395 60 111 295 510 2...... 47 1.410 700 110 85 130 1,410 345 60 80 200 422 3...... 52 840 510 100 90 130 1,320 320 64 85 177 320 4...... 44 630 345 110 100 140 990 295 64 229 142 250 5...... 42 2,230 345 120 110 340 1,410 242 272 152 129 229 6...... 52 1,150 345 140 120 4,200 1,600 208 295 100 120 200 7...... 135 805 370 160 140 7,500 1,150 200 142 85 111 540 8...... 80 630 450 180 140 6,500 950 208 105 840 229 395 9...... 64 540 770 180 140 6,000 840 295 70 295 152 295 10...... 80 450 1,320 180 140 5,000 735 216 64 188 111 1,190 11...... 135 450 540 170 140 4,800 630 250 60 135 216 1,320 12...... 142 570 510 170 140 6,000 570 510 60 370 735 4,880 13...... 152 805 630 170 140 10,500 950 422 60 480 345 2,680 14...... 132 570 2,680 170 140 5,330 910 370 100 295 910 1,150 15...... 188 510 1,230 160 140 3,040 700 295 64 735 910 875 16...... 208 450 500 160 140 2,680 570 242 64 395 1,030 735 17...... 700 395 400 1 VI 140 5,330 990 200 166 250 1,500 600 18...... 450 395 360 150 140 3,430 770 177 770 200 2,680 480 19...... 295 345 360 1 w 150 2,560 630 200 345 345 1,700 370 20...... 229 295 380 140 150 2,120 570 152 242 250 1,030 345 21...... 169 272 380 140 i NOTE. Discharge Dec. 16,1919, to Mar. 12 1920, estimated, because of ice, from discharge measure ments, weather records, and study of gage-height graph. SITSQUEHAJTITA BASIN. 273 Monthly d^c^arge of Tunkhannock Creek at Dixon, Pa., for. the years ending Sept, SO, 1919 and 1920. [Drainage area, 393 square miles.] Discharge in second-feet. Rurf-off Month. . Per in inches. Maximtm. Minimum. Mean. square mile. 1918-19. 1,900 Ill 464 1.18 1.36 1,150 185 437 i.n 1.24- 1,700 111 393 1.00 1.15 1,700 295 544 1.38 1.59 570 111 222 .56 .58 2,010 395 879 2.24 2.58 April...... 2,560 422 869 2.21 2.47 May...... 1,800 162 569 1.45 1.67 950 57 162 .41 .46 July...... 422 31 96 .24 .28 875 74 193 .49 .56 142 44 78 .20 .22 "' 410 The 'year...... 2,560 31 1.04 14.16 1919-20. 700 42 171 .435 .50 5,.640 272 895 2.28 2,54 December ...... 2,680 120 527 1.34 1.54 180 90 137 .349 .40 February...... 150 SO 132 .336 .36 10,500 130 3,480 8.85 10.20 1,600 345 801 2.04 2.28 May...... 510 60 237 .603 .70 770 52 137 .349 .39 July...... 5,000 80 552 1.40 1.61 2,680 111 643 1.64 1.89 4,880 200 771 1.96 2.19 10,500 42 711 1.81 24.60 LACKAWANNA RIVER AT HOOSIC, PA. LOCATION. At single-span ateel highway bridge at River Street or Moosic Road, Mooaic, Lackawanna County. DRAINAGE AREA. 265 square milea. RECORDS AVAILABLE. August 8,1913, to September 30,1920. Records prior to Octo ber 1, 1919, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by Nelson B. Ross. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Banks are high and not subject to overflow. Bed is com posed of culm and rocks. Control for low stages is at a slight riffle about 50 feet below gage; for medium and high stages at a pronounced riffle about 1,000 feet downstream; occasionally shifting. EXTREMES OP DISCHARGE. Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 7.7 feet at 1 p. m. March 13 (discharge, about 7,700 second-feet); minimum stage 1.98 feet at 8 a. m. October 4 (discharge, 132 second-feet). . JOB. Stage-discharge relation seldom affected by ice. ' ACCURACY. Stage-discharge relation .permanent throughout the year; not affected by ice. Rating curve fairly well defined below 1,600 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Records fair. 102721 23 WSP 501 18 , 274 SURFACE WATER SUPPLY, 1919-19®Q, PART I. Discharge measurements of Lackawanna River at Moosic, Pa., for the yeat ending Sept. 30, 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. Feet. Sec.-ft. Feet. Sec.-ft. Oct. 12 O 14 1RS Mar. 23 3.81 1,420 Nov. 7 .....do...... 3.14 911 May 14 ' B. A. Boehringer...... 2.76 501 R.C. Batley...... 2.24 279 H. L. Landis...... 2.20 271 Feb. 12 2.07 Sept*" 23 2.15 251 Mar. 23 H. B. Graves...... 3.84 1,440 Daily discharge, in second-feet, of Lackawanna River at Moosic, Pa., for the year ending Sept. 80, 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 172 W 685 280 148 230 1,130 650 230 205 420 220 2...... 240 1,220 615 275 172 240 1,400 545 210 255 378 215 3...... 148 880 545 260 200 305 1,220 480 220 305 290 185 4...... 148 685 420 200 164 384 1,040 480 220 300 270 180 5...... 148 1,400 390 210 185 1,500 1,080 420 760 240 240 180 6...... 180 1,000 390 220 210 1,600 1,130 384 580 210 230 230 7...... 200 800 450 210 210 1,220 1.000 378 378 290 210 290 8...... 185 685 450 240 185 1,000 800 384 325 275 210 245 9...... 164 615 760 290 210 880 720 366 290 270 205 255 10...... 190 545 920 260 210 1,040 650 372 240 190 220 615 11...... 205 510 650 225 190 1.220 615 420 240 172 270 545 12...... 220 580 580 220 210 3,000 545 480 200 305 270 1,310 13...... 195 840 615 240 210 5,780 720 615 290 580 260 840 14...... 245 650 1,400 200 230 3,150 720 580 240 480 390 615 15...... 240 545 960 190 180 2,000 580 510 220 366 305 450 16...... 245 510 800 180 200 1,900 545 420 210 290 280 390 17...... 378 450 650 185 220 3,150 880 384 960 240 360 360 18...... 342 420 510 164 230 2,220 800 342 1,130 220 580 270 19...... 310 390 510 180 ' 220 1,900 650 330 720 230 510 240 20...... 300 366 510 190 210 1,310 615 310 510 290 342 230 21...... 290 330 510 200 210 1,220 720 615 450 250 270 230 22...... 275 342 480 185 200 1,220 800 685 420 250 240 225 23...... 270 354 450 190 200 1,400 650 480 420 330 260 210 24...... 250 336 390 220 200 2,000 720 450 342 3,000 220 205 25...... 235 290 390 ion 200 2,590 650 378 290 1,600 205 185 26...... 200 685 342 185 220 2,460 545 378 250 1,040 190 180 27...... 255 2,220 360 200 190 2,720 545 366 250 685 180 180 28...... 305 1,400 342 225 172 2,000 450 305 225 510 164 390 29...... 280 1,000 290 190 156 1,800 450 280 230 450 450 342 30...... 320 1,040 290 1Q£ 1,600 510 260 240 390 342 1,130 31...... 450 290 176 1,220 240 390 290 Monthly discharge of Lackawanna River at Moosic, Pa., for the year ending Sept. SO, 1920. 1 [Drainage area, 265 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 450 148 245 0.925 1.07 2,220 290 721 2.72 3.04 December...... 1,400 290 547 2.06 2.38 290 164 212 .800 . 92 February...... 230 148 198 .747 .81 March...... 5,780 230 1,750 6.60 7.61 1,400 450 763 2.88 3.21 May...... 685 240 429 1.62 1.87 June...... 1,130 210 376 1.42 1.58 July...... 3,000 172 471 1.78 2.05 August ...... 580 164 292 1.10 1.27 1,310 180 371 1.40 1.55 The year...... 5,780 148 533 2.01 27.37 SUSQUEHAN5TA BIVEE WAPWALLOPEN CREEK NEAR WAPWALLOPEN, PA. LOCATION. At single-span steel highway bridge known as Harts Bridge, 3$ miles southeast of Wapwallopen, Luzerne County and 3$ miles above mouth. DRAINAGE AREA. 46 square miles. RECORDS AVAILABLE. October 24, 1919, to September 30, 1920. GAGE. Chain gage attached to downstream side of bridge; read by Calvin P. Readier. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. Left bank is high and not subject to overflow; right is of medium height and becomes inundated during extremely high stages. Bed is composed of gravel and boulders. Control is at a riffle about 1,000 feet below gage, where bed is composed of a compact formation ef course gravel tind.boulders; probably permanent. EXTREMES OF DISCHARGE. Maximum stage during the period determined from hydrograph, 7.4 feet at 11 p. m. March 5, discharge not determined; minimum stage 0.94 foot several times in September (discharge, 6 second-feet). ICE. Stage-discharge relation usually affected by ice. REGULATION. The operation of grist mills above the station may cause variation in stage during low flows. There is very little storage at the mill dam 1.5 miles above the gage; at the dam 3.5 miles above the gage there is some storage and flow during part of day at time of low water can probably be stored. ACCURACY. Stage-discharge relation permanent throughout the year except as affected by ice December 17-27, January 9-22 and February 13 to March 12. Rating curve fairly well defined between 15 and 300 second-feet. Gage read to hundred ths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good except for extreme stages, for which they are fair. COOPERATION. Station is maintained in cooperation with M. O. Leighton, consulting engineer, Washington, D. C. Discharge measurements of Wapwallopen Creek near Wapwallopen, Pa., for the year ending Sept. SO, 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. Feel. Sec.-ft. Feet. Sec.-ft. Oct. 24 H. L. Landis...... 1.54 41.4 June 12» O. W. Hartwell...... 1.28 23.0 Jan. 12« 2.08 41.4 22 2.02 99 Feb. 13« H. L. Landis...... 1.26 28.6 Aug. 18 1.98 91 Mar. 19 3.10 281 1.14 14.2 22 .....do...... 2.60 184 226 O. W. Hartwell...... 1.16 14.7 May 27b H. L. Landis...... 1.44 41.6 o Measurement made through complete ice cover. 6 Measurement made by wading. 276 SURFACE WATER 'SUPPLY, 1919-1920, PART I. Daily discharge, in seeond-feet, of Wapwallopen Greek near Wapwallopen, Pa., for the year ending Sept. 30, 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aus. Sept. 1...... 102 122 43 22 40 82 78 20 28 26 fr 2...... 136 102 36 23 50 122 69 21 25 20 12 3...... 95 87 37 21 55 95 64 23 23 11 9 4...... 78 85 30 20 70 102, 58 25 23 12 9 5...... 230 102 22 99 380 176 52 122 22 10 8 6...... 136 67 19 20 1,000 176 50 122 24 12 20 7...... :...... 108 67 19 19 600 151 45 46 26 17 37 8...... 102 71 20 17 400 129 48 32 31 18 28 9...... 88 144 40 16 320 115 46 27 21 15 18 10...... 66 129 85 16 280 108 48 26 16 11 24 11...... 75 95 60 17 380 94 50 19 14 15 22 12...... 81 83 40 IS 750 88 50 18 62 128' 12 13...... 85 115 36 24 1,100 136 100 129 29 7 14...... 69 250 28 32 580 108 10Q 144 23 87 7 15...... 60 240 24 34 325 79 70 46 61 43 10 16...... 55 151 23 36 375 , 102 55 43 69- 27 & 17...... 54 110 22 36 580 230 48 122 67 54 8 18...... 52 85 22 36 350 167 44 280 20 81 8 19...... 48 65 21 36 300 136 40 250 30 50 7 20...... 46 55 21 36 240 115 40 144 26 36 6 19' 21...... 45 50 23 34 202 136 70 115 35 8 22...... 39 50 26 34 184 122 69 93 16 ,22 7 23...... 42 50 30 34 184 108 50 78 48 20 8 24...... 40 41 55 30 34 193 102 44 67 30 1» 8 25...... 26. "U 65 29 v> 184 85 46 56 24 > 14 7 26...... 23 159 60 28 32 167 72 41 48 20 17 8 27...... 23 460 50 26 167 73 37 46 16 15 8 28...... 25 202 51 25 32 136 78 35 40 15 10 71 2fc...... 23 167 69 23 . 32 115 69 30 32 8 19 56 30...... 20 176 60 23 108 64 27 32 7 19 144 31...... <& 63 22 QQ 26 12 12 NOTE. Discharge, Dec. 17-27, Jan. 9-22 and F Discharge in s 3cond-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. November...... 460 34 104 2.26 2.52 250 50 91.9 2.00 2.31 85 19 30.1 .654 .75 36 16 27.5 .598 .64 1,100 40 320 6.96 8.02 230 64 114 2.48 2.77 May...... 100 26 52.6 1.14 1.31 280 18 75.5 1.64 1.83 July...... 69 7 27.6 .600 .69 87 8 24.7 .537 .62 144 6 19.8 .430 .48 NESCOPECK CREEK NEAR ST. JOHNS, PA. LOCATION. At first single-span steel highway bridge above the Wilkes-Barre & Hazelton Railway bridge near St. Johns, Luzerne County. DRAINAGE AREA. 49 square miles. RECORDS AVAILABLE. July 13,1916, to September 30,1920. Records prior to October 1, 1919, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by Mrs. Edwin Sterling. Elevation of zero of gage 1,116.47 feet, United States Geological Survey datum. SUSQUEHANNA EIVEE BASIN. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading* CHANNEL AND CONTROL. Banks are high and not subject to overflow. Bed is com posed of gravel and boulders. Control consists of boulders 50 feet below gage; probably permanent. EXTREMES OF DISCHARGE. Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 8.0 feet at midnight March 13-14 (discharge, about 2,540 second-feet); minimum, 1.14 feet at 7 a. m. September 26 (discharge, 9 second-feet). ICE. Stage-discharge relation seriously affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year except as affected by ice December 17 to March 12. Rating curve well defined below 100 second- feet and fairly well defined between 100 and 500 second-feet. Gage read to bun- dredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good except for medium and high stages, for which they are fair. Discharge measurements of Nescopeck Creek near St. Johns, Pa., for the year ending Sept. SO, 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. Feet. Sec.-ft. Ftet. Sec.-ft, fan. 9o 2.91 56 May 27 O. W. Hartwell. %...... 1.90 62 Feb. 116 .....do...... 1.73 31.1 1.60 30.4 Mar. 20 3.49 403 1.77 48 6 21 .....do...... 3.10 298 Sept. 9« H.L.Landis-...... 1.29 13.4 24 .....do...... 3.69 493 o Measurement made through incomplete ice cover. « Measurement made by wading. 6 Measurements made through complete ice cover. Daily discharge, in second-feet, of Nescopeck Creek near St. Johns, Pa., for the year ending Sept. SO. 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 12 75 214 75 12 24 171 123 31 47 E& 13 2...... 14 182 182 65 12 24 171 123 36 45 24 12 3...... 14 236 182 50 12 24 151 114 46 41 20 12 4,....;i...... 13 394 171 40 14 30 151 106 81 45 .18 11 5...... 12 570 132 40 14 280 142 97 151 34 16 10 3...... 12 415 132 40 16 950420' 132 89 132 15 12 7...... 12 334 114 50 19 161 81 66 2o 18 41 8...... 11 308 123 60 22 260 214 81 52 30 20 35 9...... 13 203 132 60 24 340 214 81 47 27 17 ' 26 10...... 16 123 271 60 28 260 171 81 44 24 17 25 11...... 25 132 259 50 30 240 161 89 41 22 16 25 12...... 31 161 161 ' 46 30 550 132 132 33 81 16 20 13...... 28 161 161 40 30 1,660 171 182 53 41 15 16 14...... 63 151 360 36 30 2,030 171 171 259 36 14 15 15...... 52 142 259 28 30 1,410 161 132 192 36 13 14 16...... 52 123 192 24 30 605 161 81 106 44 14 13 17...... 46 123 130 22 30 505 248 81 161 28 18 12 18...... 62 123 110 19 30 505 308 76 505 24 37 11 19...... 47 114 110 16 30 475 283 75 475 22 35 11 20...... 29 106 110 16 30 415 236 69 360 21 25 10 21...... 24 108 110 16 30 308 203 60 182 18 23 11 22...... 22 89 110 16 30 334 259 142 161 16 20 11 23...... 24 63 110 16 28 445 248 142 151 72 16 10 24...... 45 42 110 19 28 475 225'236 132 132 47 14 10 25...... 46 40 110 19 28 415 123 106 33 14 10 26...... 44 63 110 19 28 445 203 97 89 24 13 9 27...... 39 535 110 19 28 387 171 74 80 21 13 10 28...... 36 360 110 16 28 283 151 52 52 19 12 56 29...... 34 308 110 16 28 283 123 52 45 18 16 37 30...... 36 259 95 14 248 114 40 47 18 16 81 31...... 53 90 12 182 36 16 14 NOTE. Discharge Dec. 17 to Mar. 12 estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. 278 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge ofNescopeck Creek, near St. Johns, Pa., for the year ending Sept. SO, 1920. [Drainage area, 49 square miles] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. October ...... 63 11 31.2 0.637 0.73 570 40 199 4.06 4.53 3130 90 151 3.08 3.55 75 12 32.9 .671 .77 30 12 25.1 .512 .55 March...... 2,060 24 479 9.78 11.28 308 114 18S 3.84 4.28 May...... 182 38 97.2 1.98 2.28 505 31 131 2.67 2.98 July...... 81 16 32.4 .661 .76 58 12 19.3 .394 .45 81 9 19.6 .400 .45 2,060 9 117 2.39 32.61 FISHING CREEK AT BLO0MSBURG, PA. LOCATION .-KAt single-span wooden covered highway bridge known as ,Red Rock Bridge, at Bldomsburg, Columbia County. DRAINAGE AREA. 355 square miles. RECORDS AVAILABLE. January 27, 1914, to September 30, 1920. Records prior to October 1, 1919, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to upstream side of bridge; read by L. Norman Cox. DISCHARGE MEASUREMENTS. Made from upstream side of bridge or by wading. CHANNEL AND CONTROL. Banks are high and not subject to overflow. Control is at a rime, 700 feet below gage where the bed is composed of gravel; practically permanent. EXTREMES OF DISCHARGE. Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 11.4 feet at 4 a. m. March 13 (discharge, about 11,800 second-feet); minimum stage 2.00 feet at 8 a. m. October 5 (discharge, 42 secondrfeet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent except as affected by ice for short periods in December, January, and February. Rating curve well defined below 600 second-feet and fairly well defined between 600 and 2,200 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily discharge ascertained by applying daily mean gage height to rating table. Records fair. Discharge measurements of Fishing Creek at Bloomsburg, Pa., during the year ending Sept. 30, 1920. Gage Dis Gage Dis Date. Made by charge. Date. Made by height. charge. Feet. Sec.-ft. Feet. Scc.-ft. Ant On 2.65 135 H. L. Landis...... 2.71 167 Jan. 13& 3 17 287 2.98 215 Feb. 146 ....do...... 2.94 222 a Measurement made by wading 500 feet above gage, considerable fluctuation owing to operation of power plant. 6 Measurement made through incomplete ice cover, c Measurement made by wading. SUSQUEHAFSTA BIVER BASIN, 279 Daily discharge, in mcdnd-feet, of Fishing Creek at Bloomsburg, Pa., for the year ending Sept. 30, 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 62 1,170 1,170 282 180 212 1,050 650 188 212 200 1QS 2...... 62 1,600 895 280 190 185 1,090 590 168 175 203 175 3...... 73 1,400 790 280 209 258 1,090 560 195 294 1SS 170 4...... 55 1,980 590 280 250 258 1,010 500 162 590 172 165 5...... 75 2,630 530 260 270 4,040 1,330 458' 590 306 130 93 6...... 93 1,600 560 242 290 5,720 1,510 434 685 246 126 121 7...... 54 1,170 560 242 335 2,630 1,330 390 446 206 104 165 8...... 84 860 560 238 370 1,880 1,130 385 330 1,330 150 165 9...... 96 720 970 242 325 1,420 970 405 282 720 178 99 10...... 88 560 1,420 458 390 1,420 895 330 242 446 134 250 11...... 94 620 1,090 370 278 2,290 340 227 370 121 3OA 12...... 121 790 970 238 190 5,080 650 370 182 1,250 335 221 13...... 140 1,050 390 262 227 8,400 1,250 470 180 895 215 192 14...... 106 895 2,750 224 206 5,080 1,420 500 290 650 224 155 15...... 190 790 2,180 200 215 2,750 1,170 390 215 1,420 215 112 16...... 146 685 1,600 200 215 3,240 1,090 355 200 1,090 212 114 17...... 365 590 1,170 221 198 4,620 2,180 330 355 790 215 138 18...... 385 530 800 200 230 3,110 2,080 302 1,980 560 310 19;...... 274 470 750 190 310 2,630 1,690 1,600 720 410 112 20...... 227 416 700 190 330 1,980 1,420 1,050 650 302 IQQ 21...... 221 340 700 240 238 1,510 1,250 500 860 470 221 116 22...... 206 330 685 200 355 1,600 1,130 470 720 365 238 Oft 23...... 195 320 685 294 172 1,880 930 385 650 380 274 54 24...... 212 306 560 300 150 2,510 825 345 500 335 200 <\Q 25...... 209 286 452 280 282 2,750 685 330 464 330 155 57 26...... 203 930 416 240 286 2,870 590 298 350 270 185 71 27...... 198 5,720 385 320 195 3,110 590 266 286 246 126 54 28...... 212 2,750 375 355 254 2,080 620'685 234 238 200 138 530 29...... 262 1,780 315 227 192 1,690 215 238 165 400 360 30...... 234 1,600 345 200 1,600 530 162 238 130 440 1,090 31...... 470 315 ISO 1,250 188 136 302 NOTE. Discharge Nov. 2-3 estimated, because of no gage-height record; Dec. 18-21, Jan. 2-5,15-16,18-21. 24-27, and Jan. 30 to Feb. 2 estimated, because of ice, from discharge measurements-, weather records, and study of gage-height graph. Monthly discharge of Fishing Creek at Bloomsburg, Pa., for the year ending Sept. 30,1920. [Drainage area, 355 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 470 54 175 0.493 0.57 5,720 286 1,160 3.27 3.65 December...... 2,750 315 828 2.33 2.69 458 180 256 .721 .83 February...... 390 150 253 .713 .77 March ...... 8,400 185 2,580 7.27 8.38 April...... 2,180 530 1,100 3.10 3.46 May...... 650 162 377 1.06 1.22 1,980 162 470 1.32 1.47 July...... 1,420 130 514 1.45 1.67 440 104 220 .620 .72 1,090 54 190 .535 .60 8,400 54 679 1.91 26.03 280 SUBFACE WATEB SUPPLY, 1919-1920, PART I. WEST BRANCH OF SUSQUEHANMFA RIVER AT BOWER, PA. LOCATION. At single-span steel highway bridge 4 miles northeast of Mahaffey, near railroad station at Bower, Clearfield County. DRAINAGE AREA. 320 square miles. RECORDS AVAILABLE. October 2, 1913, to September 30, 1920. Records prior to October 1,1918, are contained in the annual reports of the Water Supply Commis sion of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by A. T. Bell. Ele vation of zero of gage, 1,207.22 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. Right bank is low and subject to overflow at extremely high stages; left is high and not subject to overflow. Bed is composed of gravel. Control is at a riffle about 200 feet below gage; probably permanent. EXTREMES OP DISCHARGE. Maximum stage recorded during the year ending Septem ber 3Q> 1919, 10.95 feet at 7.30 a. m. October 31 (discharge from extension of rating curve, 6,680 second-feet); minimum stage, 4.04 feet at 7.30 a. m. July 10 (dis- '. charge, 50 second-feet). Maximum stage during the year ending September SiOj, 1920, estimated from hydrograph, 14.6 feet at 2.30 p. m. March 12, stage-discharge relation affected by ; ice, discharge not determined; minimum, 4.02 feet at 5.30 p. m. October 1 (dis charge, 48 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year except as affected by ice January 6-9 and 11, 1919, and December 29, 1919, to March 12, 1920. Rating curve fairly well defined between 80 and 4,000 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily dis charge ascertained by applying daily mean gage height to rating table* Records good. Discharge measurements of West Branch of Susquehanna River at Bower, Pa., for the years ending Sept. 30,1919 and 1920. Gage Dis Gage Dis Date. Made by- height. charge. Date. Made by- charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Aug. 13o 4.68 \AA El. L. Landis...... 11.96 2,780 4.99 232 1920. Feb. 3 & IE. L. Landis...... *.. 7.71 243 » Measurement made by wading 400 feet above gage. * Measuremerit made through complete ice cover. e Measurement made through complete ice cover 100 feet below gage. STJSQUEHANITA KTVER BASIN". 281 Daily discharge, in second-feet, of West Branch of Susquehanna River at Bower, Pa., for the years ending &*pt. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. JFeb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 205 3,260 315 1,950 265 2,060 265 335 280 135 56 730 .178 1,840 315 4,880 400 1,260 250 580 250 110 56 qqc 3...... 190 1,180 335 2,880 378 935 235 445 235 106 52 205 4...... 145 1,010 280 1,840 250 762 280 355 190 95 53 155 5...... 178 795 315 1,019 220 700 265 315 165 94 58 135 6...... 730 670 280 650 135 700 250 298 155 72 610 118 7...... 610 550 250 600 205 580 190 550 145 65 730 lia 8...... 400 495 298 600 220 495 205 730 145 63 335 107 9...... 280 422 265 550 178 935 190 2,640 145 55 235 98 10...... 250 378 298 445 145 2,060 190 5,610 235 52 94 11...... 235 335 670 440 145 830 220 4,046 155 165 145 92 12...... 250 315 1,090 422 165 700 580 2,400 118 90 118 95 13...... 280 280 1,090 400 165 580 355 1.640 118 190 155 92 14...... 250 280 1,740 445 265 495 . 315 1,090 110 495 135 92 15...... 220 250 2,060 550 580 422 315 865 102 298 102 77 16...... 205 250 1,740 522 355 470 355 900 125 445 92 68 17...... 190 315 1,360 445 280 1,640 522 2,060 125 298 762 68 18...... 165 1,360 1,090 445 250 2,170 470 1,640 110 205 610 63 19...... 155 1,450 865 470 205 1,740 378 1,090 95 155 610 61 20...... 165 1,640 610 378 220 1,090 315 1,180 110 145 400 92 21...... 470 1,540 550 378 235 865 315 4,040 250 145 235 92 22...... 378 1,180 1,360 335 235 670 280 3,520 165 135 730 S3 23...... 298 1,010 2,760 400 422 550 265 2,280 108 155 378 205 24...... 250 ' 865 2,170 1,840 470 422 378 1,840 96 135 235 118 25...... 250 TOO 1,740 1,090 495 378 335 1,640 96 96 865 92 26...... 935 580 1,260 865 1,640 355 315 1,090 580 78 495 68 27...... 972 470 1,010 730 522 378 298 830 445 72 355 63 28...... 795 445 762 640 700 495 280 640 250 62 280 63 29 .... 1,090 495 730 470 400 265 495 110 63 205 61 30...... 1,260 422 580 422 315 235 400 165 72 1§0' 53 31...... 5>760, 580 378 280 335 62 762 fm 1919-20. 1...... 50 1,540 935 220 220 110 400 1,740 145 165 190 155- 2...... 30 3,65Q 940 160 220 »£ 355 1,360 178 145 104 3...... 55 2,280 470 140 280 120 335 1,010 135 470 110 78 4...... -.I '51 1 540 280 110 400 1M\ 878 ,795 135, 280 74 68 5...... 50 1,450 855 95 440 2,800 670 610 378 220 63 65 6...... 63 972 315 95 440 7,500 762 495 220 145 55 102 7...... 118 670 1,360 95 400 4,800 TOO 422 165 125 65 110 8...... ,w I>e90 110 400 2,200 610 365 135 190 145 83 9...... 82 422 935 280 360 1,300 550 315 205 155 355 445 10...... 107 ' 355 1,640' 1,300 320 2,000 522 280 145 185 495 400 11...... 205 400 972 1,000 280 5,600 495 250 135 118 315 522 12...... 280 422 830 ,760 320 9,000 470 '37g378 118 118 100 470 13...... 250 422 1)640 550 320 8,050 495 125 110 145 495 14...... 250 400 2,620 440 280 4,600 470 378 190 192 126 298 15...... 280 335 1,450 400 360 2,520 , 400 315 355 118 118 220 16...... 865 280 865 320 2,280 550 250 2,170 J01 400 135 17...... 1,360 ,298 670 240 600 3 780 1,450 220 6,850 89 445 98 18...... 1,180 280 610 160 560 8,000 1,950 220 6,650 86 445 104 19...... 550 250 550 120 500 2,060 1,540 220 2,880 92 495 110 20...... 422 220 400 110 400 1,840 2,170 235 1,450 89 400 102 '!' 190 21...... 335 470 120 320 1.840 3,910 1,450 1,090 102 235 98 22...... 670 178 378 320 240 1J450 2,640 900 762 102 265 83 23...... 495 165 400 500 320 1,260, 2,170 580 550 92 205 78 24...... 355 178 298 650 320 1 480 1,840 445 640 77 its 77 25...... 355 205 298 650 280 1,540 1,360 378 400 82 125 83 '900 26...... xis 1,840 265 650 240 1,540 315 365 71 107 74 27...... 762 5,460 280 550 190 1,260 900 250 220 64 101 65 28...... 1,090 2,520 280 440 160 935 1,360 235 205 57 118 71 39...... ;... 935 1,540 280 360 140 700 1,180 178 MO 50 107 98 30...... 640 1 fUVl 280 280 550 1,010 155 190 55 92 178 31...... *...... 670 260 240 «HK 145 92 110 .. - . ill .'.. NOTE. Discharge, Jan. 6-« and 11, 1919, andDee. 20, 1919, to Mar. 12, 1920, estimated because of ice,, from discharge measurements, weather records, and study of gage-height graph. 282 SURFACE WATER SUPPLY, 1919-1920, PART I. e of West Br®»dk ^^o/^t*syw^»^a;J?t®ffl-ai \Bowcp, Pa., for tfo years [Drainage area, 320 square miles.] Discharge in second-feet. Run-oft Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 5,760 145 572 1.79 2.06 3.260 250 826 2.58 2.88 2,760 250 928 2.90 3.34 4,880 335 886 2.77 3.19 1,540 135 344 1.08 1.12 March...... 2,170 280 830 2.59 2.99 April...... 580 190 304 .950 1.06 May...... 5,610 298 1,480 4.62 5.33 580 95 179 .559 .62 July...... 495 52 142 .444 .51 865 52 329 1.03 1.19 730 53 126 .394 .44 The year ...... 5,760 52 583. - 1.82 24.73 1919-20. October ...... 1,360 50 419 1.31 1.51 5,460 165 1,010 3.16 3.53 2,520 260 710 2.22 2.55 1,300 95 370 1.16 1.34 600 140 341 1.07 1.15 March ...... 9,000 95 2,480 7.75 8.94 April...... 3,910 335 1,080 3.38 3.77 May...... 1,740 145 492 1.54 1.78 6,850 118 914 2.86 3.19 July...... 470 50 126 .394 .45 495 55 207 .647 .75 September...... 522 65 169 .528 .59 9,000 50 694 2.17 29.56 WEST BRANCH OF SUSQUEHAHKA RIVER AT REKOVO. PA. LOCATIQN. At Eighth Street three-span steel highway bridge, Renovo, Clinton County. DRAINAGE AREA. 2,990 square miles. RECOEDS AVAILABLE. -July 1, 1895, to December 31, 1903, and October 1, 1905, to September 30, 1920. Records prior to October 1, 1919, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain gage attached to upstream side of bridge; read by P. H. Walize. Ele vation of zero of gage 634.03 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. -Banks are high and not subject to overflow. Bed is com posed of rocks. Control is at the first of a series of riffles about 1,000 feet below gage; probably permanent. EXTREMES OF DISCHARGE. Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 15.0 feet at noon March 13 (discharge, about 81,300 second-feet); minimum stage, 0.07 foot at 6 p. m. August 7 (discharge, 554 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year except as af fected by ice January 1 to March 6. Rating curve fairly well defined between 200 and 75,000 second-feet. Gage read to half-tenths twice daily until August 19; to hundredths twice daily since that date; during high stages more frequently. Daily discharge ascertained by applying mean daily gage height to rating table. Records fair. BIVER BASIN. 283 Discharge measurements of West Branch of Smquehanna River at Renovo, Pa. > for tlte year ending Sept. SO, Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. Feet. Sec.-ft. Feet. Sec.-/fc Jan. 24o 2.52 1,360 I June 26 O. W. Hart well...... 2.10 3,400 Feb. 26« .....do...... 1.81 1,360 2.22 3,850 Apr. 15 2.72 4,730 .16 742 a Measurement made through complete ice cover. Daily discharge, in second-feet, of West Branch of Susquehanna River at Renovo, Pa., for the year ending Sept. .30, 1920. W Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 610 12,600 11,000 1,600 1,100 1,000 5,650 10,200 1,660 1,720 850 750 2...... 800 22,600 8*400 1,500 1,100 1,000 5,100 11,400 1,520 1,720 1,060 700 3...... j 800 25,600 5,930 1,400 1,000 1,200 4,350 10,200 1,520 1,720 1,110 655 4...... 700 17,100 5,370 950 1JOO 8,750 1,520 1,590 1,000 655 5...... 610 14,809 4,590 1*300 909 2,«00 4*590 7,400 1,860 1,590 800 655 6...... 800 11,000 4,350 1,300 950 11,000 6,800 6,220 2,150 1,460 700 655 7...... 1,660 9,000 4,120 1,300 1,100 17,600 7,400 5,370 2,300 1,340 570 700 8...... 1,460 7,000 4,840 1,400 1,200 11,400 7,100 4,840 2,000 1,220 800 1,000 9...... 1,340 6,000 6,220 1,500 1,200 11,000 5,930 4,120 1,720 1 460 750 1,060 10...... 1,520 4,800 6,510 1,700 1,200 8,750 5,650 3,710 1,590 1*660 800 1,110 11...... 2,000 4,600 5,650 1,900 1,200 11,000 5,100 3,510 1,520 1,860 1,000 1,720 12...... 3,320 6,000 5,370 2,200 1,200 36,000 4,840 3,320 1,460 1,400 1,860 2,950 13...... 4,590 5,650 6,510 2,600 1,200 69 000 5,100 3,320 1,340 1,000 1,860 2,620 14...... 4,120 5,370 7,400 2,400 1,200 45^100 4,840 3,510 1,280 1,000 2,620 2,780 15...'..... 3,910 5,100 11,800 2,200 1,200 22,600 4,350 3,710 1,220 900 2,150 2,620 16...... 4,840 8,050 1,900 1,300 19,100 4,840 3,320 1,340 900 2,300 2,300 17...... 5)000 4,590 6,800 1.700 1,400 35,300 6,800 2,620 5,100 800 3,320 2,150 18...... 9,800 3,710 6,510 1,600 1 900 o-i oftA 12,600 2,460 31,100 700 3,320 2,000 19...... 7,700 3,510 4 840 1,500 2*200 22,000 14,200 2,460 22,600 800 3,510 1,280 20...... 5,370 3,320 4,120 1,400 2,000 17,100 11,800 2,460 12,600 122 3,130 1,000 21...... 4,350 2,950 3,130 1,300 1,900 16,600 10,200 2,620 9,100 1,160 2,300 750 22...... 4,120 2,620 2,950 1,300 1,700 12,200 15.600 2,780 6,800 1,000 2,150 750 23...... 3,910 2,460 3 130 1,300 1 500 11,000 13,400 3,130 5,370 1,160 1,340 ' 700 24...... 3,710 2,460 2,780 1,300 1,400 12,200 12,200 3,320 4,590 1,340 1,460 655 25...... 3,130 2,620 2,«20 1,400 1,300 13,800 9,800 3,130 3,910 > 1,220 1,28ft 655 26...... 2,780 2,780 2,460 1,400 1,300 16,600 8,400 2,780 3,130 1,000 1,160 655 27...... 3,320 22 600 2,300 1,400 1,300 16,600 7,100 2,620 2,620 900 950 610 28...... 6,510 26,200 2,150 1,300 1,300 13,800 8,050 2,460 2,300 85ft 800 1,400 29...... 10,600 17,100 2,150 1,300 1,100 10,200 9,450 2,150 2,000 800 850 2,150 30...... 9,100 14,200 1,860 1,200 7,700 9,450 2,000 2,000 602 900 2,620 31...... 7 JAT) 1 Sfifl 1,200 6,510 1,860 700 750 NOTE. Discharge Oct. 16-17 and Nov. 7-12 estimated, because of no gage height record. Discharge Jan. 1 to Mar. 6 estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. 284 SURFACE WATEE SUPPLY, 1919<--1920, PART I. Monthly discharge of West Branch of Susquehanna River at Renova, Pa., for the year ending Sept. SO, 1920. [Drainage arei,2,990 square miles.] Discharge in seioncWeet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. October ...... 10,60) 610 3,820 1.28 1.48 26,200 2^460, 9,070 3.03 3.38 11,800 1,860 : 5,020 1.68 1.94 2,600 1,200 .1,550 .518 .60 February...... 2,200 900 . 1,,320 .441 .48 69,000 1.000 16,600 5.55 6.40 April...... 15,600 4 120 7,830 2.62 2.92 Mky...... A...... 11,400 1,860 4,250 1.42 1.64 31,100 1,220 4,640 1.55 1.73 July...... 1,860 602 1,190 .398 .46 3,510 570 1,530 .512 .59 2,950 610 l'$40 .448 .50 69,000 S70 4,850 1.62 22.12 WEST BRANCH OF SUSQUEHANNA RIVER AT WILLIAMS]?ORT, PA. LOCATION. At Market Street five-span steel highway bridge, Williamsport, Lycoming County. DRAINAGE AREA. 5,670 square miles. RECORDS AVAILABLE. March 1, 1895, to September 30, 1920. Records prior to Octo ber 1, 1918, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain gage attached to upstream side of bridge; read by J. V. April. Eleva tion of zero of gage 494.55 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from upstream side of bridge or by wading. CHANNEL AND CONTROL. Banks are high and rocky. Bed is composed of silt and gravel; shifts slightly. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Septem ber 30, 1919, 20.9 feet at midnight May 22 (discharge, 140,000 second-feet); mini mum stage, 0*.50 foot at 4.30 p. m. September 21 (discharge, 1,330 second-feet). Maximum stage recorded during the year ending September 30, 1920, 20.4 feet 1 and 5 p. m. March 13 (discharge, 135,000 second-feet); minimum, stage, 0.54 foot at 8.10 a. m. October 1 (discharge, 1,400 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout both years, except as af fected by ice January 8-13,1919, and January 2 to March 5,1920. Rating curve fairly well defined below 3,000 second-feet and well defined from 3,000 to!20,000 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily discharge ascertained by applying daily mean gage height to rating table. Records good, except those for extremely low stages, which are fair. Discharge measurements of West Branch of Susquehanna River at Williamsport, Pa., during the years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. V 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. July 18 2.47 5 ion 1.57 2,220 Feb. 24o .....do...... 1.57 2,690 0. W. Hartwell...... 3.95 9,250 Measurement made through incomplete ice cover. SUSQUEHASTNA RIVER BASIN. 285 J)aily discharge, in second-feet, of West Branch of Susyuehanna River at WUliamspoft, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 5,000 40,400 5,220 8,700 6,000 10,000 10,000 5>730 9,690 6,000 2,770 4,490 2...... 4,500 30,200 4,980 11,500 4,260 14,090 9,020 6,280 8,380 ' 4,730 2,960 4,020 3...... 4.260 21,900 4,490 24,900 4,490 14,500 8,060 7,440 7,140 3,800 2,400 3,580 4...... 6,280 17,200 4,260 21,900 4,490 16,700 7,750 7,750 6,280 3,160 2,220 3,370 5...... 6,560 14,000 3,800 16,200 4,49* 11,200 7,750 7,440 8,700 2,960 2,060 3,160 6...... 7,750 11,900 4,020 11,200 4,490 11,900 7,440 7,140 5,220 2,770 2,220 2,770 7...... 19,900 10,000 3,800 9,020 3,370 11,900 6,850 7,140 5,470 3,580 2,960 2,409 8...... 18,100 8,700 3,580 7,440 3,580 11,200 6,560 7,440 5,220 2,770 2,77C 2226 9...... 13,600 7,750 3,580 6,000 2,960 12,800 7,750 9,020 11,500 2,400 2,060 10...... 10,800 7,140 3,580 5,470 2,960 20,900 8,380 36,300 10,400 2,220 2^77( 1,900 11...... 9,020 8,560 3,800 4,980 2,580 19,900 8,060 83,400 9,350 2,580 2,220 1,820 ;12...... 7,750 6,000 4,260 4,260 2,770 17,200 11,200 56,200 8,060 2,580 1,980 1 750 -13...... 4,260 5,470 5,000 4,020 2,770 14,500 14,000 38,600 7,440 2,220 1,820 1,680 14...... 6,280 5,000 8,060 4,260 4,020 12,300 13,600 28,000 4,020 2,060 1,680 1,600 15...... :...... 5,470 4,730 11,500 5,470 "6,000 10,800 11,900 22,400 4,490 2,220 1,600 1,600 16...... - 4,980 4,490 15,400 6,560 ft, 560 9,690 11,500 18,100 6,000 6,2H) 1,600 1,540 .17...... 4,490 4,260 14,900 5,470 6,000 13,600 14,500 16,200 4,980 7,140 1,900 1,460 18...... 1 4,020 7,750 13,200 5,730 5,220 20,900 15,800 20,900 4,260 5,220 8.700 1,400 W 3,800 15400 11,500 5,730 4,980 27,000 14,900 21,400 3,800 4 9ftfl 11,500 1,330 20...... 3,580 15,800 10,000 6,000 3,800 23,900 13,200 19,000 3,580 4,730 12,300 1,400 21...... 3,580 14,500 8,700 5,470 4,260 19,900 11,500 63,700 3,800 9,020 8,380 1,3?0 22...... 3,800 13,200 8,400 5,220 4,020 16,700 10,400 120,000 3,580 23,900 6,560 1,480 23...... 3,800 11,500 18,000 4,980 4,490 14,500 19 snfl 130,000 3,370 18,100 5,730 -1,900 24...... X...... 3,800 10,400 24,900 6,560 4,260 12,300 8,380 75,600 2,960 11,900 4,730 2,080 25...... 3,580 9,020 22,900 9,020 4,490 10,400 8,060 49,400 2,770 8,060 4,490 2,060 26...... 3,800 8,380 20,900 10,800 6,000 9,350 7,440 35,700 3,160 5,730 4,260 1,750 27...... 5,730 7,440 18,100 10,400 6,850 9,020 7,140 27,000 5,470 4,980 4,260 1,600 28...... 7,440 6,850 15,400 9,690 4,730 14,000 6,850 21,900 14,000 4,260 4,020 1,540 29...... 6,000 6,280 12,800 8,700 14,000 6,280 17,600 11,500 3,370 4,020 1,460 30...... 9,020 5,470 10,800 7,750 12,300 6,000 14,500 8,060 3,000 3,370 1,400 31...... 33,500 9,350 7,750 11,200 11,500 2,580 3,160 1919-20. 1...... 1,400 13,600 20,900 3,580 2,000 2,400 14,000 16,200 3,580 3,370 1,600 1,980 2...... 1,460 27.500 17,200 3.200 2,200 2,000 11,900 18,500 3,370 3,160 1,600 1,820 3...... 1,540 37,400 13,200 2,800 2,000 2,200 10,800 18,500 3,160 3,580 1,540 1,680 4...... 1,540 30,200 11,200 2,400 1,900 2,200 10,000 16,200 2,960 3,160 1,820 1,600 5...... 1,460 25,400 9,360 2,400 2,000 5,000 11,200 14,500 3,800 2,960 1,600 1,600 6...... 1,460 20,900 8,060 2,400 2,000 18,100 15,400 11,500 4,730 2,770 1,460 1,820 7...... 1,460 17,200 8,700 2,400 2,000 28,000 16,700 10,000 4,730 2,580 1,460 2,060 8...... 1,980 14,000 8,700 2,800 2,000 28,000 15,400 9,020 4,260 2,580 1,820 2,060 9...... 2,220 11..500 10,000 3,000 2,400 22,400 13,600 8,380 3,800 2,400 1,900 2,060 10...... 2,060 9,690 11,500 3,200 2,400 19,000 11,900 7,440 3,580 2,580 2,220 3,370 11...... 2,220 9,020 11,900 3,200 2,400 21,900 11,200 6,850 3,370 2,580 5,470 4,260 12...... 2,960 10,000 11,200 3,200 2,400 43,500 10,000 7,140 3,160 2,400 5,730 3,800 13...... 4,020 13,'600 10,800 4,200 2t«0 12$,,«60 11,200 7,440 2,960 2,220 5,470 4,490 14...... 5,220 13,200 15,800 5,000 2,200 92,500 13,200 7,750 2,770 2,060 4,490 4,490 15...... 4,980 11,900 19,000 4,200 2,900 48,400 11,900 7,140 2,770 2,220 3,800 4,020 16...... 4,730 10,800 15,800 3,600 4,000 36, ado 11,500 6,850 2,770 2,060 4,490 3,370 17...... 6,000 9,350 12,300 3,200 3,400 50,900 14,000 6,280 3,800 1,820 4,490 2,770 18...... ' 12,800 8,380 9,020 2,800 2,800 57, «X) 22,900 5,730 24,900 1,750 6,000 2,220 19...... 11,500 7,750 7,750 2,800 3,200 43,908 26,400 5,470 35,700 1,680 6,280 2,060 -20...... 9,020 7,140 7,750 2,600 4,000 33,500 22,900 5,470 22,900 1,900 6,000 1,900 21...... 7,440 6,280 7,440 2,400 3,600 27,006 19,900 5,730 15,400 2,580 4,980 1,820 22...... 6,280 5,470 7,440 2,200 3 200 23,400 22,900 6,850 11,900 2,060 4,260 1*680 23...... 6,000 5, -220 7,140 2,000 2,800 21,900 24,400 8,380 9,690 2,060 3,800 1,600 24...... 5,470 4,980 6,560 2,200 2,800 25,400 19,500 7,750 8,060 1*980 3,160 1,600 25...... 4,980 4,980 6,000 2,400 2,600 30,700 17,600 6,560 6,560 2,770 2,960 1,540 26...... 4,490 6,560 6,000 2,400 2,400 34,000 15,400 6,280 5,730 2,580 2,580 1,540 27...... 4,260 31,800 5,220 2,400 4,000 39,200 13,200 5,730 4,980 2,060 2,220 1,460 28...... 5,220 45,400 4.980 2,400 2,600 31,800 14,000 5,220 4,260 1,900 2,060 1,460 29...... 11,200 32,900 5,220 2,600 2,200 24,400 15,400 4,730 3,800 1,750 2,400 2,220 .30...... 13,600 25,400 4,260 2,400 19,900! 15,400 4,260 3,580 1,600 2,580 3,800 3i...... :...... 12,300 3,800 2,400 16,200 4,020 1,540 2,220 NOTE. Discharge Jan. 8-13. 1919, and Jan. 2 to Mar. 5, 1920, estimated because of ice, from discharge measurements, weather records, and study of gage-height graph. 286 SURFACE WATER SUPPLY, 191&-19HQ, > PABT I. Monthly discharge of West Branch of Swquehanna River at WHliamsport, Pa., for the years ending Sept. 30, 1919 and 1920. [Drainage area, 5,670 square miles.] Discharge in second-feet. Run-off in ' Month. Per inches. Maximum. Minimum. Mean. "square mile. 1918-19. 33,500 5,580 7,560 1.33 1.53 40,400 4,260 11,300 1.99 2.22 24,900 3,580 9,970 1.76 2.03 January 24>9CO $io' 8,i» 1.49 1.72 February...... "...... 6,850, 4f4<» .787 .82 27,000 9,020 14,500 2.56 2.95 April...... 15,800 6,000 9; 770 1.72 1.92 May 130,000 5,730 32,000 5.64 6.50 14,000 2,770 6,420 1.13 1.26 July...... 23,900 2.080 5 440 .959 . I." 12,300 1,600 4,010 .707 .82 September...... 4,490 1,330 2! 070 .365 .41 The year...... 130,000 1,330 9,720 1.71 23.29 1919-20. 13,600 1,400 5,200 ,917 1.06 45,400 4,980 15,900 2.80 3.12 December...... 20.900 3,800 9 810 1.73 1.99 5,000 2,000 2,860 .504 .58 4,000 1,900 2,640 .466 .60 128,000 2,000 31 600 5.57 6.42 26,400 10,000 15,500 2.73 3.05 Ifay...... 18,500 4,020 8,450 1.49 1.72 35,700 2,770 7 230 1.28 1.43 July...... 3,580 1,540 2,340 .413 .48 6.280 1,460 3 310 .584 .67 September...... i ..... 4,490 1,460 2,410 .425 .47 The year...... 128,000 1,400 8,960 1.58 21.49 CLEARFIELD CREEK AT DIKELESTG, FA. LOCATION. At single-span steel highway bridge at Dimeling, Clearfield County, 400 feet downstream from mouth of Little Clearfield Creek. . DRAINAGE AREA. 370 square miles. RECORDS AVAILABLE. October 2, 1913, to September 30, 1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. .-, ,; GAGE. Chain gage attached to upstream side of bridge; read by John Olsen. Eleva tion of zero of gage 1,145.56 feet, '-United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. Left bank is high and not subject to overflow; right is low and is overflowed at extremely high stages. Bed at control riffle, about 250 feet below gage, is composed of coarse gravel and boulders; probably permanent, EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Septem ber 30, 1919, 11.04 feet at 4 p. m., May 22 (discharge, 7,750 second-feet); mini- mum stage, 3.30 feet at 4 p. m., September 19 (discharge, 27 second-feet). Maximum open-water stage during the year ending September 30, 1920, esti mated from hydrograph, 12.8 feet at noon March 13 (discharge, 11,700 second- feet); a stage of 18.5 feet was reached at 11.30 p. m. March 11, but the water was htld back by an ice jam; minimum stage, 3.40 feet at 4 p. m. October 4 (dis charge, 35 second-feet). ICE. Stage-discharge relation seriously affected by ice. RIVER BASJN. sst ACCURACY. Stage-discharge relation permanent throughout both year6A«*cept as affected by ice January 6-9, 12-19, February 7-14, December 16-21, December 29,1919, to January 10,1920, and January 15 to March 12,1920. Eating curve fairly well defined below 100 second-feet and well defined between 100 and 11,000 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily discharge ascertained by applying daily mean gage height to rating table. Becord* good, except for low stages, which are fair. Discharge measurements of Clearfield Creek at Dimeling, Pa., during the years ending Sept. 80,191$ and 1920. Oaee Dis Gage Dis Date. Made by- height. charge. Date, Made by- height. charge. 1919. Feet. Ssee.-ft. 1930. Feet. Sec.-fi. Aug. 12 3.87 89 Mar. 4o.. 7.57 316 4.76 305 1920. Feb. 2« a 1ft 224 o Measurement made yirough complete ice cover. Daily discharge, in second-feet, of Clearfield Creek at Dimeling, Pa, for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept, 1918-19. 1...... 187 2,560 270 790 240 675 270 375 335 187 69 176 2...... 176 1,700 200 3,040 212 515 255 420 300 144 61 144 3...... 176 1.120 176 2,100 200 850 270 375 255 107 53 126 4...... 165 790 212 1,420 200 702 285 318 212 93 46 106 5...... 154 702 200 760 240 675 318 285 200 86 78 87 6...... 675 620 187 600 176 790 285 255 200 69 154 65 7...... 620 540 165 600 180 675 255 318 187 60 398 75 8...... 355 442 165 600 170 465 226 565 187 57 226 59 9...... 270 375 187 46O 160 702 212 1-340 240 52 144 47 10...... 240 318 176 420 170 980 200 4,140 465 44 126 45 11...... 212 300 240 420 180 675 212 3,580 255 74 103 99 12...... 187 285 850 420 240 592 420 2,000 165 69 87 85 13...... 335 255 850 420 400 515 355 1,420 135 101 74 69 14...... 212 1,520 440 650 420 300 1,040 126 118 63 72 15...... 176 200 1,520 Daily discharge, in second-feet, of Clearfield Creek at, Din^eling, Pa., for the years ending Sept, SO, 1919 and 19%0 Continued. ; Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. .June. July. Aug. Sept. 1919-20. 1...... 51 1,340 QSfl 220 220 130 ."JRS 1 609 W1*1 200 226 iai 2...... 53 9 fish enij 160 220 110 490 1,340 176 165 165 3...... 55 2.100 620 140 240 14A 442 1,120 126 200 12* 126 4...... 39 1,340 398 130 280 380 592 915 144 255 98 118 5...... 72 1,120 285 110 320 2,200 790 790 240 187 96 106 ...... 87 790 355 110 300 6,000 1,260 648 *375 126 84 109 7...... 101 648 540 110-IDA 360 3,600 980 515 355 135 81 126 8...... 70 KftC QOA 380 1,900 980 465 285 187 154 ltd 9...... 84 dfi*; 7GTI 94A (fin 1,400 790 442 212 200 270 126 10...... ;... 187 355 980 1,200 340 1,300 760 375 187 154 730 318 n.....'...... 255 442 980 1,180 320 2,400 702 355 165 118 620 1,180 12...... 318 Ann 7^ft 730 VIA 6,500 592 355 165 126 285 760 13...... 300 442 1,520 540 300 10,300 490 515 154 118 285 730 14...... 420 OQQ i anA KAf\ , VIA 4,920 648 790 176 101 300 . ,442 15...... 648 355 1,340 420 320 3,040 592 620 355 118 255 335 16...... 7on. OQK 1,000 qxrt qfin 2,920 109 355 980 109 285 240 17...... 7on Iftft 750 240 440 5,270 2,000 375 6,360 86 515 187 18...... 620 255 550 190 550 3,180 2,220 335 6,360 81 790 187 19...... 420 919 Attfl 140 550 2,320 1,700 300 3,180 99 850 200 20...... inn 200 420 500 1,900 2,320 270 1,520 135 490 144 21...... 285 187 3SO 160 380 1,340 3,720 375 1,12» 109 398 101 22...... 300 919 qoc 240 inn 1.340 3,180 790 86 420 126 23...... 335 1S7 375 420 280 1,340 1,6QO, 442 648 84 300 101 24...... 226 226 QQC 600 240 1,600 1,520 420 592 120 240 93 25...... 165 QQC qqe 700 220 1,600 1,180 420 490 116 200 96 26...... 9jin QKfl 300 600 190 1,700 915 375 355 87 176 109 27...... 515 4 600 270 500 170 1,340 915 300 270 74 154 118 28...... 1 fUA 2> Sftfl 270 160 1,120 1,340 270 240 64 135 318 29...... 915 1,900 280 300 140 915 1,180 240 240 65 135 335 30...... 592 1,420 280 240 702 1,040 200 212 73 144 648 31...... 592 94fi R71 165 93 144 NOTE. Discharge Jan. 6-9, 12-19, Feb. 7-14, Deo. 16-21, Dec. 29, 1919, to Jan. 10, 1920, and Jan. 15 to Mar. 12, 1920, estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. Monthly discharge of Clearfield Creek at Dimeling, Pa., for the years ending Sept. SO, 1919 and 19m. [Drainage area, 370 square miles.] Discharge in second-feet. Month. Per Run-off in Maximum. Minimum. Mean. square inches. mile. 1918-19. October, ...... 4 ...... 4,920 126 445 1.20 1.38 2,560 200 594 1.61 1.80 2,680 165 717 1.94 2.24 3,040 355 704 1.90 2.18 850 118 305 .824 .86 March ...... 2,220 300 718 1.94L 2.24 April...... :. 515 200 310 .838 .94 May...... 7,750 255 1,510 4.08 4.70 1,800 103 285 .770 .86 July...... 442 44 136 .367 .42 850 46 229 .619 .71 September.... , ...... 176 31 78 .210 .23 7,750 31 506 1.37 18.57 1919-20. 1,040 39 350 .946 1.09 4,600 187 919 2.48 2.77 1,900 240 631 1.71 1.97 1,200 110 366 .989 1.14 550 140 312 .843 .91 March...... 10,300 130 2,370 6.41 7.39 3,720 442 1.200 3.24 3.62 May...... 1,600 165 520 1.41 1.63 6,360 126 887 2.40 ;,2.68 July...... 255 61 125 .338 .39 850 ' 81 293 .792 .91 1,180 93 271 .732 .82 10,300 39 688 1.86 25.32 SUSQUEHANFA RIVER BASIN. 289 DRIFTWOOD BRANCH OF SINNEMAHONING CREEK AT STERLING RUST, PA. LOCATION. At three-span steel highway bridge at Sterling Eun, Cameron County. DRAINAGE AREA. 270 square miles. RECORDS AVAILABLE. September 30, 1913, to September 30, 1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by C. U. Lupro. Elevation of zero of gage 694.60 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. Banks are low and subject to overflow during extremely high stages. Bed is composed of gravel. The control for low stages is at the first of a series of gravel riffles extending from 50 to 100 feet below the gage; prob ably permanent; for medium and high stages is at the first of a series of riffles extending from 300 to 500 feet below the gage, probably permanent. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Septem ber 30, 1919, 5.84 feet at noon May 22 (discharge, 7,880 second-feet); minimum stage, 0.55 foot August 4 and 5 (discharge, 12 second-feet). Maximum open-water stage during the year ending September 30, 1920, esti mated from hydrograph, 5.9 feet at 4 a. m. March 13 (discharge, 8,110 second-feet); a stage of 10.4 feet, estimated from hydrograph, was reached at 9 p. m. March 5, but the water was held back by an ice jam; minimum stage 0.68 foot on October 1 and September 27 (discharge, 23 second-feet). ICE, Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year except as affected by ice December 19, 1919, to March 5, 1920. Rating curve well defined between 20 and 10,000 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily discharge ascertained by applying mean daily gage height to rating table. Records good. Discharge measurements of Driftwood Branch of Sinnemahoning Creek at Sterling Run, Pa., during the years ending Sept. SO, 1919 and Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Nov. 21 2.33 1,026 Jan. 256 1.75 98 Feb. 276 .....do...... 1.83 79 1919 O. W. Hartwell...... 108 Aug. 16o Ferris and Suavely...... 70 32 a Measurement made by wading. 6 Measurement made through complete ice cover. 102721 23 WSP 501 19 290 SURFACE WATER SUPPLY, 191&-1920, PART I. Daily discharge, in second-feet, of Driftwood Branch of Sinnemahoning Creek at Sterling Run, Pa., for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar Apr May. June July Aug. Sept. 1918-19. 1 1...... 195 458 168 ACC 272 300 220 103 16 2...... 190 1,940 122 448 278 593 190 82 37 235 172 I qprt 442 OCfl 136 22 186 I f\Af\ 386 267 656 132 50 5...... 140 710 122 328 267 548 100 46 14 on 6...... 150 575 103 548 250 434 100 37 58 70 7...... 122 EOA 91 262 100 37 "ifi 60 8...... 140 458 177 506 . 278 458 146 30 36 50 g 190 378 1 Ivl 760 442 692 136 26 22 10...... 168 QftA 126 980 450 5 AKf) 118 24 17 en 11...... 186 278 136 865 584 4,400 106 30 14 Kf\ 12...... 272 Ifij 109 701 1,610 2,470 72 26 ttf\ 13...... 349 ^7ft 566 -1,240 1,540 60 23 14 Kf\ 14...... 710 272 225 482 865 980 62 23 14 40 1 *> 970 370 710 810 68 23 18 OQ 16...... 980 91 A CKU 638 611 56 72 15 9^ 17...... 810 195 159 920 760 1,040 62 30 314 OK 18...... 683 195 177 1,540 760 349 50 23 710 25 19...... 474 150 143 1,380 665 1,100 37 18 865 25 20...... 356 115 106 1,040 566 865 32 56 434 Kf\ 21...... 710 314 106 118 1,540 530 3,220 164 190 284 f\f\ 22...... 665 506 106 136 611 450 7,420 50 370 267 75 23...... 490 363 46 172 182 NOTE. Gage readings Oct. 1, 1918. to Nov. 20,1918, not reliable. Discharge Dee. 19, 19K>, to Mar. 5, 1920, estimated, because of ice, from discharge measurements, weather records, and study or gage-height graph. Discharge Sept. 5 and 6, 1920, estimated because of no gage-height record. SUSQUEHANNA RIVER BASIN. 291 Monthly discharge of Driftwood Branch of Sinnemahoning Creek at Sterling Run, Pa., for the years ending Sept. 30, 1919 and 1920. [Drainage area, 270 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 1,460 122 526 1.95 2.25 1,940 106 428 1.58 1.82 February...... 356 91 167 .618 .64 1,540 278 620 2.30 2,65 April...... 1,610 250 508 1.88 2.10 7,420 300 1,520 5.63 6.49 1.040 30 146 .541 .60 July...... '370 18 65.9 .244 .28 865 14 161 .596 .69 349 23 68.5 .254 .28 1919-20. 1,310 23 334 1.24 ].43 3,600 150 821 3.04 3.39 810 95 377 1.40 1.61 120 38 63.9 .237 .27 180 80 126 .467 .50 6,310 SO 1,670 6.19 7.14 1,170 235 550 2.04 2.2S 1,040 85 279 1.03 1.19 810 42 141 .522 .58 July...... 267 28 79.5 .294 .34 980 " 2325 171 .633 .73 100 41.8 .155 .17 "6,310 23 389 1.44 19.63 BALD EAGLE CREEK AT MILESBURG, FA. LOCATION. At Pennsylvania Railroad two-span bridge at Mijesburg, Center County, 1,000 feet above mouth of Spring Creek. DRAINAGE AREA. 140 square miles. RECORDS AVAILABLE. February 6, 1911, to September 30, 1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Staff fastened to downstream end of bridge pier; read by P. H. Haupt. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. Right bank is high, steep, and rocky; left is low and sub ject to overflow at extremely high stages. Control is a riffle about 100 feet upstream from the mouth of Spring Creek; bed is composed of gravel and boul ders; probably permanent. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Sep tember 30, 1919, 6.5 feet at 8 a. m. May 22 (discharge, from extension of rating curve, 6,720 second-feet); minimum stage, 0.05 foot August 12 and 14 and several days in September (discharge, 9 second-feet). Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 8.2 feet at 11 p. m. March 12 (discharge, about 10,000 second-feet); minimum stage, 0.00 foot July 29, 30, August 5 and 6 (discharge, 7 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent, except as affected by ice December 16, 1919, to March 11, 1920. Rating curve well denned below 2,000 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good. 292 SURFACE WATER SUPPLY, 1919^-1920^ PART I. Discharge measurements of Bald Eagle Creek at Milesburg, Pa., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. ' 1920. Feet. Sec.-ft. July 21o 0.50 44 Jan. 306 1.34 41.9 22 .....do...... 2.15 456 Mar. 36 .....do...... 1.79 54 O.W. HartweU...... 65 65 a Measurement made by wading. 6 Measurement made through complete ice cover. Daily discharge, in second-feet, of Bald Eagle Creek at Milesburg, Pa., for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. V 1...... 39 552 62 420 101 1,060 116 84 84 30 26 30 2...... 32 310 58 525 101 552 108 210 72 24 21 27 3...... 51 240 56 255 101 310 108 141 6P 18 20 24 39 182 49 160 90 225 101 116 49 17 17 20 5...... 36 150 45 150 77 195 87 101 41 17 20 17 41' 6...... 160 132 141 68 182 80 87 51 23 36 15 7...... 94 116 41 141 68 150 72 132 51 23 30 14 8...... 77 101 39 141 68 132 64 170 124 16 23 12 64 37 132 68 1,220 TO 470 170 11 17 11 10...... 53 77 35 132 68 470 51 3,390 87 11 14 12 11...... 43 67 60 132 68 310 69 1,590 61 15 11 14 12...... 46 58 170 132 68 225 132 770 53 14 9 10 13...... 46 55 210 132 68 1S2 116 445 43 14 11 14...... 39 49 420 132 195 150 101 290 41 14 9 9 15...... 34 46 330 132 124 101 210 41 27 26 16...... 29 A^ 240 132 108 330 352 170 41 68 29 9 17.. ...|...... 24 86 182 132 87 1,340 1.010 1,010 41 24 770 9 18...... 20 470 150 150 80 1,220 330 552 39 17 420 12 19...... 16 195 132 150 77 470 255 330 34 46 1,010 11 20...... 26 116 160 72 182 525 32 53 240 12 21...... 53 132 160 60 272 150 4,260 30 47 1?9 10 22...... 43 116 770 160 53 210 132 5,340 28 420 101 30 23...... 34 101 1,110 195 87 160 124 2,740 27 310 79 26 24...... 29 87 735 420 101 141 132 965 23 94 64 20 25...... 41 77 498 255 150 116 116 525 23 61 53 14 26...... 108 .72 330 182 610 101 101 398 62 46 46 11 27...... 87 64 255 160 195 101 87 255 240 39 41 10 28...... 77 74 195 141 116 225 80 195 80 30 41 9 39...... 108 77 170 132 150 84 150 45 27 36 20...... 225 64 160 108 124 77 124 34 24 32 9 31...... 2,280 160 108 116 101 27 34 SUSQUEHANNA EIVER BASIN. 293 Daily di in second-feet, of Bald Eagle Creek at Milesburg, Pa., for the years ending Sept. 30, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 16 330 182 50 36 32 150 735 39 39 8 30 2...... 12 1.280 141 46 40 42 132 498 34 34 8 27 3...... 10 470 124 42 50 55 150 330 36 41 7 23 4...... 9 255 116 32 55 100 375 240 46 34 7 18 5...... 10 225 101 28 60 850 1,280 182 150 29 7 13 6...... 12 160 101 32 60 1,500 700 141 86 26 11 46 7...... 11 132 195 46 60 650 498 116 55 27 95 60 8...... 11 108 170 60 70. 380 352 101 47 41 79 34 9...... 15 90 470 95 70 300 255 98 49 29 39 49 10...... 18 77 352 160 70 480 210 90 41 20 640 240 26" 11...... 101 225 110 70 2,000 182 87 39 18 352 108 12...... 20 150 182 85 70 5,800 150 132 34 23 132 101 13...... 16 525 420 75 70 5,800 965 225 32 17 82 132 14...... 14 255 375 60 70 1,720 470 182 30 18 62 84 15...... 39 170 150 50 60 420 330 141 28 23 87 56 '46 16...... 101 141 80 42 35"? 116 124 16 94 46 17...... 98 116 60 36 42 2,580 1,340 108 2,580 12 141 39 18...... 68 101 55 39 55 1,340 1,010 98 1,520 10 150 34 19...... 53 90 55 32 75 840 552 91 552 9 108 28 20...... 43 77 1 60 40 70 525 420 84 255 9 86 20 2i...... 39 69 70 50 55 398 805 170 182 8 72 17 22...... 49 64 70 50 50 498 770 108 150 8 75 15 23...... 41 62 70 50 42 700 525 79 132 8 58 13 24...... 41 58 60 55 36 920 375 74 101 9 43 11 25...... 37 53 60 55 36 920 240 69 82 8 36 17 26...... 43 498 60 55 32 770 195 67 69 7 30 16 27...... 60 1.590 60 50 32 580 240 60 60 7 26 12 28...... 210 552 55 46 32 445 352 56 49 7 26 43 29...... 116 330 50 46 32 290 255 54 45 7 32 41 30...... 80 255 50 42 210 470 49 41 7 28 290 31...... 116 55 36 182 44 7 34 NOTE. Discharge Dec. 16,1919, to Mar. 11,1920, estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. Monthly discharge of Bald Eagle Creek at Milesburg, Pa., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 140 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October... 2,280 16 130 0.929 1.07 November. 552 43 134 .957 1.10 December.. 1,110 36 225 1.61 1.86 January... 525 108 181 1.29 1.49 February.. 610 53 114 .814 .85 March..... 1,340 101 352 2.51 2.89 April...... 1,010 51 152 1.09 1.22 May...... 5,340 84 834 5.95 6.87 June...... 240 23 62 .443 .49 July...... 420 11 52 .371 .43 August.... 1,010 9 110 .7*6 .91 September. 30 9 14 .JOO .11 The year. 5,340 9 198 1 1. 41 19.29 1919-20. October.... 210 9 46.3 .331 .38 November.. 1,590 53 279 1.99 2.22 December., 470, 50 138 .986 1.14 January.... 160 28 54.5 .389 .45 February... 75 32 53.3 .381 .41 March...... 5,800 32 1,070 7.64 8.81 April...... 1,340 132 470 3.36 3.75 May...... 735 44 149 1.06 1.22 June...... 2,580 28 223 1.59 1.77 July...... 41 7 18.0 .129 .15 August..... 640 7 85.6 .611 .70 September.. 290 11 55.4 .396 .46 The year. 5,800 7 221 1.58 21.46 294 SURFACE WATER SUPPLY, 1919-1920, PART I. BALD EAGLE CREEK AT, BEECH CREEK STATION, PA. LOCATION. At three-span steel highway bridge at Beech Creek station of Penn sylvania Railroad, Clinton County. DRAINAGE AREA. 565 square miles. RECORDS AVAILABLE. June 24, 1910, to September 30, 1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by C. A. Rodgers. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Right bank is high and not subject to overflow; left bank subject to overflow at extremely high stages. Bed is composed of gravel and rocks. Control is at a riffle, about 1,000 feet below gage, where there is" a pronounced fall; practically permanent. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Sep tember 30, 1919, 9.37 feet at 7 a. m. and noon May 22 (discharge, 13,400 second- feet); minimum stage, 1.48 feet September 27-30 (discharge, 144 second-feet). Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 10.2 feet at 5 a. m. March 13 (discharge, 15,500 second-feet); min imum stage 1.43 feet at 4 p. m. October 8 (discharge, 129 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation probably permanent except as affected by ice January 5-15 and December 16, 1919, to February 11, 1920. Rating curve fairly well defined between 150 and 10,000 second-feet. Gage read to hundredths twice daily; during high stages' more frequently. Daily discharge ascertained by applying daily mean gage height to rating table. Records good. Discharge measurements of Bald Eagle Creek at Beech Creek station, Pa., during the years ending Sept. 30, 1919 and 1&20. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Aug. 20 2 0A 2.34 304 Mar. 26 .....do...... 1.89 308 O. W. Hartwell...... 2.49 750 « Measurement made through complete ice cover. & Measurement made through incomplete ice cover. SUSQUEHANNA EIVEE BASIN. 295 Daily discharge, in second-feet, of Bald Eagle Creek at Beech Creek Station, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June July Aug. Sept. 1918-19. 1...... 310 2,400 570 790 468 1,370 752 500 828 468 266 221 2...... 280 1,580 500 1,470 405 1,180 715 790 752 405 252 209 3...... 310 1.280 435 1.180 375 1,100 678 605 678 370 217 201 4...... 305 1,100 375 980 468 980 678 ^535 605 348 209 201 5...... 290 902 370 900 405 940 605 535 535 315 230 185 6...... 790 790 353 900 320 940 570 535 570 305 435 189 7...... 640 715 342 1,200 405 865 535 678 605 315 295 185 8...... 570 640 326 1,500 364 790 535 715 535 266 252 ' 189 9...... 500 605 315 1,100 320 1,680 500 1,370 1,800 248 230 185 10...... 468 500 295 1,200 261 1,680 468 7,410 1,180 230 213 182 11...... 435 468 310 2,400 252 1,370 468 5,780 902 315 201 182 12...... 435 435 678 1,900 310 1,180 640 2,970 715 266 193 174 13...... 435 405 865 1,300 320 1,100 570 2,140 640 252 205 164 14...... 364 364 1,280 1,900 605 980 535 1,580 570 234 193 160 15...... 342 331 1,370 900 715 828 535 1,280 605 295 221 150 16...... 326 310 1,100 405 468 902 752 1,100 678 605 221 171 17...... 305 435 1,020 435 353 2,970 1,280 2,020 605 305 980 157 18...... 290 1,280 865 500 310 2,820 1,180 1,680 570 221 828 150 19...... 275 865 752 535 800 2,140 1,020 1,280 468 234 1,800 150 20...... 261 865 640 4AC 300 1,800 940 1,280 468 370 678 182 21...... 364 865 605 435 353 1,470 865 11,100 435 348 435 178 22...... 331 790 828 468 1,280 752 12,900 405 1,370 405 209 23...... 310 715 2,400 468 468 1,020 678 8,600 348 980 364 225 24...... 300 715 2,020 1,100 405 940 678 4,320 305 500 295 209 25...... 290 715 1,680 865 468 828 605 2,820 315 435 310 174 26...... 468 715 1,280 865 1,470 752 570 2,140 535 348 261 160 27...... 678 715 1,100 828 1,470 1,100 535 1,800 902 295 225 147 28...... 640 715 980 715 980 1,280 535 1,470 715 266 209 147 29...... 605 715 865 640 980 500 1,280 605 256 201 147 30...... 678 640 790 640 865 468 1,020 535 238 234 147 31....!...... 5,780 715 640 828 902 248 243 1919-20. 1...... 348 2,680 1,060 340 340 468 1,100 2,140 370 375 375 375 2...... 217 1,910 940 340 380 320 1,100 1,800 348 331 331 348 3...... 182 1,470 790 320 240 310 940 1,680 353 364 295 342 4...... 157 1,180 715 ' 280 340 435 1,280 1,280 364 310 285 331 5...... 178 1,100 640 280 380 1,910 2,400 1,100 865 270 275 315 6...... 147 QAO onft 460 1,910 980 640 252 295 405 7...... 138 790 570 300 Afin 1,910 1,680 865 435 270 752 500 8...... 132 640 535 340 460 1,470 1,470 865 375 364 605 405 9...... 150 570 1,100 440 440 1,180 1,280 790 500 320 468 331 10...... 182 535 1,280 700 380 1,370 1,180 715 435 280 1,680 865 11...... 205 640 1,020 550 340 2,680 1,020 640 405 295 1,580 715 12...... 248 940 940 CAA 6,750 940 678 375 290 980 640 13...... 234 1,370 1,370 295 13,400 2,140 940 270 790 678 14...... 234 1,060 1,580 400 320 5,780 1,680 . 865 364 280 752 570 15...... 234 940 1,180 QQA 435 3,280 1 ^7ft 790 500 280 715 500 16...... 261 828 850 OJA 640 3,450 1,370 790 1,370 252 940 435 17...... 570 715 650 320 752 6,360 2,680 715 3,280 234 790 435 18...... 334 640 550 280 500 4,320 2,680 640 3,120 248 1,020 375 19...... 300 570 500 280 500 3,450 2,270 640 1,470 331 828 348 20...... 252 500 460 340 375 2,680 1,910 640 1,180 290 715 348 21...... 941 500 500 oon 2,140 2,270 715 .1,020 270 640 331 22...... 261 435 550 340 500 2,020 2,140 640 865 252 640 320 23...... 405 KKA oon Ofiyl 9 4flfl 1,910 570 790 T7X: 570 320 24...... 234 375 500 320 2,820 535 678 331 500 315 07 e OAA AQK 25...... oon dfift O7C 2 Q7ft 1,370 570 K7A 300 300 26...... 248 AA£\ OQA cnn 2,820 1,180 500 KAA 275 Q1A 27...... 310 4 140 400 280 715 2,970 1,280 500 Aftt\ 261 342 320 28...... 570 2^270 ^Rft. 300 640 2,140 1,370 >«oc 435 O CO 405 375 29...... 468 1,680 380 OAA CAA 07 e 941 468 348 JO...... 375 1,370 340 300 1,280 i 98ft 405 AOK 225 375 715 Jl...... 678 340 320 1,180 405 225 405 NOTE. Discharge Jan. 5-15 and Dec. 16, 1919, to Feb. 11, 1920, estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. 296 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Bald Eagle Creek at Beech Creek Station, Pa., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 565 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 5,780 261 593 1.05 1.21 2.400 310 786 1.39 1.55 2,400 295 839 1.48 1.71 2.400 400 952 1.68 1.94 February...... 1,470 252 493 872 .91 2,970 752 1.260 2.23 2.57 1,280 468 671 1.19 1.33 May...... 12,900 500 2,680 4,74 5.46 1,800 305 647 1.14 1.27 July...... 1,370 221 376 .665 .77 August...... 1,800 193 365 .646 .74 September...... 225 147 178 .315 .35 The year...... 12,900 147 825 1.46 19.81 1919-20. 678 132 277 .490 .56 November...... 4,140 375 1,090 1.93 2.15 December...... 1,580 340 715 1.27 1.46 700 280 352 .623 .72 February...... 752 295 444 .786 .85 13,400 310 2,850 5.04 5.81 April ...... 2,680 940 1,600 2.83 3.16 2,140 405 815 1.44 1.66 3,280 348 775 1.37 1.53 July...... 375 225 288 .510 .59 1,680 275 633 1.12 1.29 September...... 865 300 430 .761 .85 13,400 132 857 1.52 20.63 PINE CREEK AT CEDAR RUN, PA. LOCATION. At single-span steel highway bridge at Cedar Kun, Lycoming County. DRAINAGE AREA. 590 square miles, RECORDS AVAILABLE .-^July 19, 1918, to September 30, 1920. Records prior to Octo ber 1,1919, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by C. R. Nivison. Elevation of zero of gage 781.96 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. Right bank is high; left is low but not subject to overflow. Bed is composed of gravel. Control is at a riffle, about 500 feet below gage where the bed is composed of gravel; probably permanent. EXTREMES OP DISCHARGE. Maximum stage during the year ending September 30, 1920, estimated from hydrograph, 7.5 feet at 2 a. m. March 13 (discharge, about 12,500 second-feet); minimum stage 1.25 feet on several days in September (dis charge, 82 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCTOACY. Stage-discharge relation permanent throughout the year except as affected by ice December 19,1919, to March 11,1920. Rating curve well defined between 100 and 2,000 second-feet. Gage read to hundredths twice daily; during high stages oftener. Daily discharge ascertained by applying daily mean gage height to rating table. Records good, except for high and low stages, for which they are fair. SUSQUEHANNA RIVER BASIN. 297 Discharge measurements of Pine Creek at Cedar Run, Pa., during the year ending Sept. SO, 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. Feet. Sec.-ft. Feet. Sec.-ft. Jan. 28 a 2.50 151 Aug. 17 H. L. Landis...... 2.21 569 Mar. la ....do...... 2.55 106 Sept. 26 R. J. Ferris...... 1.36 98 Apr. 13 R. A. Boehringer...... 3.18 1,640 26 .....do...... 1.36 100 O. W. HartweU...... 1.71 210 a Measurement made through complete ice cover. 6 Measurement made by wading. Daily discharge, in second-feet, of Pine Creek at Cedar Run, Pa., for the year ending Sept. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 140 1,930 1,670 380 140 100 1,230 1,410 223 140 143 118 2...... 140 3 7nn 1,410 280 140 100 1,050 1,290 210 138 140 108 3...... 135 o oin 1 OQft 200 lifi 100 995 1,230 205 146 138 100 4...... 135 9 9Af\ 1,050 170 140 100 830 1,170 191 146 135 95 5...... 135 2,580 940 160 140 100 1,290 995 250 135 125 92 6...... 177 1,930 Qin 140 140 100 1,290 830 352 115 125 108 7...... 1QS 1,670 780 170 140 100 1,290 830 286 118 125 149 8...... 158 I oen 7OA 170 140 100 1,170 730 194 128 130 132 0...... 149 1,110 730 170 130 100 1,050 630 286 164 130 125 10...... 170 940 oin 160 130 120 830 540 191 146 135 149 11...... OAK 1,050 KQK 160 130 130 830 October...... 1,230 135 423 0.717 0.83 4,400 460 1,480 2.51 2.80 December ...... 1,670 220 742 1.26 1.45 380 140 174 .295 .34 February...... 140 100 119 .202 .22 March...... 8,650 100 2,160 3.66 4.22 April...... 1,800 830 1,180 2.00 2.23 May...... 1,410 250 641 1.09 1.26 June...... 680 140 230. .390 .44 July...... 630 108 184 .312 .36 540 122 184 .312 .36 September...... 460 82 128 .217 .24 The year...... 8.650 82 638 1.08 14.75 298 SURFACE WATER SUPPLY, IM^-IQSO, PART I.. PINE CREEK NEAR WATERVILLE, PA. LOCATION. At single-span steel highway bridge three-fourths mile above railroad station at Waterville, Lycoming County. DRAINAGE AREA. 750 square miles. RECORDS AVAILABLE. July 15, 1908, to September 30, 1915, and July 12, 1916, to September 30,1920, when the station was discontinued. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by F. J. Crediford. Elevation of zero of gage 608.04 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. Banks are high and not subject to overflow. Bed is com posed of gravel. Control is at the head of a series of riffles about 600 feet below gage; probably permanent. EXTREMES OP DISCHARGE. Maximum stage recorded during the year ending Sep tember 30, 1919, 12.1 feet at 6.30 p. m. May 22 (discharge, 27,900 second-feet); minimum stage 1.08 feet at 5 p. m. September 20 (discharge, 152 second-feet). Maximum open-water stage during the year ending September 30, 1920, esti mated from hydrograph, 9.9 feet at 4 a. m. March 13 (discharge, 19,600 second- feet); a stage of 11.68 feet was observed at 8 a. m. March .12, but the water was held back by an ice jam; minimum stage, 0.80 foot at 5 p. m. September 5 (discharge, 64 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year, except as affected by ice February 9-14, and December 19,1919, to March 12,1920. Rating curve well denned below 23,000 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily discharge ascertained by applying daily mean gage height to rating table. Records good. Discharge measurements of Pine Creek near Waterville, Pa., during the years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by- height. charge. Date. Made by height. charge. 1918. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Nov. 18 2.04 772 2.60 218 Feb. 28« 2.20 173 1919. Apr. 14 2.98 1,770 Alia 91 2.22 CUfl O. W. HartweU...... 1.61 431 o Measurement made through complete ice cover. SUSQUEHAKNA BIVER BASIN. 299 Daily discharge, in second-feet, of Pine Creek near Water ville, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 770 3,120 680 1,060 640 725 1,520 725 1,170 525 600 564 2...... 770 2,320 600 1,280 564 1,400 1,400 815 1,010 525 564 4/om 3...... 1,460 1,900 600 2,040 490 1,340 1,280 770 815 429 429 490 4...... 2,630 1,640 564 1,900 525 1,220 1,280 725 770 364 338 600 5...... 1,170 1,640 525 1,640 490 1,280 1,170 770 680 313 325 525 6...... 5,200 1,225 525 1,460 422 1,900 1,060 680 680 680 490 525 7...... 3,120 1,060 490 1,340 410 1,520 1,010 770 600 564 770 490 8...... 1,900 1,010 455 1,220 338 1,520 1,640 860 680 377 455 448 9...... 1,900 960 455 1,120 320 2,470 2,180 960 640 358 396 358 10...... 1,640 910 455 1,060 300 3,290 2,180 6,780 680 442 351 332 11...... 1,280 860 525 960 260 2,470 2,180 9,530 525 640 265 325 12...... 910 770 564 860 QAfl 2,180 3,120 7,260 442 403 260 319 13...... 1,060 680 640 815 420H 1,900 2,790 4,990 403 325 243 271 14...... 960 640 960 680 600 1,640 2,470 3,820 377 301 210 238 15...... 910 600 1,400 600 770 1,340 2,180 2,790 390 490 200 216 16...... 860 600 1,640 564 564 1,340 2,040 1,900 390 1,770 210 205 17...... 860 600 1,640 525 455 1,460 2,950 2,180 390 910 295 190 18...... 770 815 1,520 490 455 2,320 2,630 2,950 332 564 1,280 170 19...... 770 2,320 1,520 600 390 2,320 2,180 2,630 338 490 1,400 160 20...... 640 2,320 1,520 640 455 9 ft4A 2,040 2,180 325 525 1,400 156 21...... 600 1,900 1,460 564 390 1,900 1,770 16,400 1,010 1,060 1,010 200 22...... 525 1,770 1,900 564 390 1,770 1,640 22,900 680 3,820 960 338 23...... 525 1,640 2,470 640 403 1,520 1,400 24,800 436 3,120 725 422 24...... 490 1,400 2,180 910 403 1,170 1,280 12,300 364 2,180 680 377 25...... 455 1,060 2,180 1,010 455 1,220 1,170 8,000 319 1,220 640 319 26...... 640 960 2,040 960 525 1,170 1,010 5,200 325 1,010 640 309 27...... 770 860 1,900 910 564 1,170 960 3,640 1,120 910 640 265 28...... 770 815 1,900 860 416 2,180 860 2,790 680 815 600 243 29...... 960 860 1,460 860 2,040 860 2,180r 640 564 525 221 30...... 1,170 770 1,280 725 1,640 770 1,640 600 525 490 200 31...... 3,820 1,170 725 1,770 1,340 455 725 1919-20. 1...... 180 2,790 2,320 700 200 160 1.900 1,640 416 260 216 205 2...... 160 5,410 1,900 600 200 180 1,640 1,640 377 248 180 180 3...... 165 4,590 1,770 500 200 200 1,520 1,640 396 363 160 160 4...... 165 3,640 1,460 400 200 460 1,460 1,520 370 277 160 128 5...... 180 4,010 1,340 360 200 1,400 1,400 1,400 525 238 136 90 6...... 216 2 790 1,170 280 200 1,900 1,400 1,400 640 216 117 180 7...... 243 2.' 320 1,120 280 200 1,900 1,770 1,280 455 200 124 226 8...... 277 1,900 1,060 280 200 2,000 1,770 1,060 436 216 221 254 9...... 221 1 640 960 260 200 960 384 216 210 180 10...... 248 1,060 260 200 1,460 860 364 200 725 301 11...... 301 1,400 1.660 260 200 6,500 1,340 860 364 210 525 289 12...... 384 1,520 960 260 180 13,000 1,220 1,060 332 200 564 260 13...... 490 1,900 960 260 180 16,100 1,460 1,060 319 185 390 232 14...... ^.... 422 1,770 QfiA 260 180 8,500 1,900 1,010 301 190 363 210 15...... 448 1,640 1,520 240 180 4,790 1,770 960 271 185 390 254 16...:...... 490 1,460 1,520 240 180 4,590 1,770 910 313 185 429 232 17...... 1,280 1,400 1,640 200 180 8,500 2,320 815 770 165 770 190 18...... 1,120 1,170 1,280 200 180 6,540 2,630 770 1,770 128 600 170 19...... 910 1,060 1,000 200 180 5,200 2,470 725 1,220 152 525 120 20...... 815 Qfifl 850 200 180 3,640 2,320 725 1,010 243 455 108 21...... 725 770 200 180 3,290 2.320 770 770 313 448 108 22...... 725 770 750 200 180 2,630 2,040 770 640 265 416 105 23...... 680 770 750 200 180 2,790 1,900 860 564 221 351 108 24...... 640 770 700 200 180 2,790 1,770 815 422 351 295 105 25...... 600 815 650 200 180 4,390 1,640 815 410 860 243 99 26...... 564 960 700 200 180 5,410 1,340 770 364 564 216 99 27...... 600 6,310 750 200 180 6,310 1,340 680 332 429 200 90 28...... 860 4,790 650 200 180 5,410 1,460 640 301 363 180 93 29...... 1,770 3,290 550 200 180 3,290 1.400 564 277 301 221 105 30...... 1,520 9 NOTE. Discharge Feb. 9-14 and Dec. 19,1919, to Mar. 12,1920, estimated because of ice, from discharge measurements, weather records, and study of gage-height graph. 300 SUBFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Pine Creek near Waterville, Pa., for the years ending Sept. SO, 1919 and 19W. [Drainage area, 750 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 5,200 455 1,300 1.73 1.99 November...... 3.120 600 1,270 1.69 1.8fr 2.470 455 1,200 1.60 1.84 January ...... 2.040 490 954 1.27 1.46 February ...... 770 260 454 .605 .63 3.290 725 1,720 2.29 2.64 April...... 3.120 770 1,700 2.27 2.63 May...... 24,800 725 5,010 6.68 7.70 June...... 1,170 319 594 .792 .88 July...... 3,820 301 860 1.15 1.33 1 400 200 584 .779 .90 600 156 332 .443 .49 The year...... 24,800 156 1,340 1.79 24.28 1919-20. 1,280 160 610 .813 .94 November...... 6,310 770 2,230 2.97 3.31 December...... 2,320 550 1,080 1.44 1.66 700 200 272 .363 .42 February...... 200 180 188 .251 .27 March...... 16,100 160 4,290 5.72 6.60 April...... 2.630 1,340 1,720 2.29 2.56 May...... 1,640 490 968 1.29 1.49 1 770 265 513 .684 .76 July...... 860 128 272 .363 .42 770 117 332 .443 .51 377 90 175 .232 .26 16,100 90 1,060 1.41 19.20 LYCOMING CREEK NEAR TROUT RUN, PA. LOCATION. At single-span steel highway bridge 2J miles above Trout Run, Lycoming County. DRAINAGE AREA. 185 square miles. RECORDS AVAILABLE. December 4, 1913, to September 30, 1920. Records prior to October 1, 1919, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by Miss Orpha Apker. Elevation of zero of gage, 693.4 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. Right bank is overflowed during extremely high stages; left is high and does not overflow. The bed is composed of gravel and large stones. Control is at a gravel riffle about 100 feet below gage; probably permanent. EXTREMES OF DISCHARGE. Maximum gage height during the year ending September 30, 1920, estimated from hydrograph, 8.5 feet at 10 p. m. March 12 (discharge, 3,700 second-feet); minimum stage, 1.65 feet August 4 and 5, September 25 and 26 (discharge, 18 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year except as affected by ice December 16,1919, to February 8,1920. Rating curve fairly well defined from 50 to 3,000 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily discharge ascertained by applying daily mean gage height to rating table. Records fair. SUSQUEHANIsrA RIVER BASIN. 301 Discharge measurements of Lycoming Creek near Trout Run, Pa., during the year ending Sept. SO, 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. Feet. Sec.-ft. Feet. Sec.-ft. 2.56 57 Apr. 16 R. A. Boehringer...... 3.40 378 Feb. 25o .....do...... 2.14 58 17 .....do...... 3.95 585 Apr 14 3.60 425 O. W. Hartwell...... 2.30 94 o Measurement made through complete ice cover. 6 Measurement made by wading. Daily discharge, in second-feet, of Lycoming Creek near Trout Run, Pa., for the year ending Sept. SO, 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 40 545 435 34 44 57 505 231 64 39 33 30 2...... 38 930 365 34 44 60 435 217 58 71 30 28 3...... 38 585 305 38 44 61 470 190 52 94 26 26 4...... 35 470 305 38 44 67 400 154 57 81 19 22 5...... 48 665 275 30 44 930 505 142 131 65 18 20 6...... 52 705 260 34 60 1,130 505 131 131 52 24 52 7...... 42 585 245 30 75 705 435 118 87 42 41 52 8...... 38 470 217 42 70 545 382 190 71 39 41 41 9...... 43 305 275 42 61 435 335 217 62 38 41 38 10...... 275 305 34 60 400 305 154 55 38 92 118 11...... 71 365 245 28 54 705 275 204 51 39 245 81 12...... 54 350 190 26 54 2,170 245 245 51 41 165 57 13...... 60 745 290 26 57 2,660 505 231 51 36 43 45 14...... 62 505 305 30 61 1,300 435 217 52 31 54 40 15...... 68 435 275 48 68 835 382 190 48 52 53 38 16...... 91 365 190 55 71 835 382 178 58 42 45 34 17...... 245 305 140 60 87 1,540 585 165 178 38 48 34 18...... 165 275 110 55 131 980 470 154 335 39 38 30 19...... 120 245 85 48 70 835 400 142 275 45 33 30 20...... 98 217 70 48 120 665 382 142 217 36 28 27 21...... 91 190 60 44 101 545 435 154 114 33 33 26 22...... 98 178 70 55 68 585 435 154 76 33 39 24 23...... 86 178 85 55 61 745 350 131 81 41 29 21 24...... 81 178 75 55 57 1,130 305 131 78 33 27 20 25...... 78 165 75 55 57 1,300 275 118 62 31 25 19 26...... 82 275 85 55 91 1,600 245 114 60 30 24 33 27...... 98 1,480 90 55 92 1,880 260 107 52 27 22 41 28...... 178 930 70 48 84 1,080 290 98 48 26 22 33 29...... 165 745 55 44 71 835 275 92 47 22 38 30 30...... 178 585 48 38 705 275 79 43 20 35 43 31...... 190 ^ 38 44 585 71 28 34 NOTE. Discharge Dec. 16 to Feb. 8 estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. Discharge, Sept. 22, estimated; gage not read. Monthly discharge of Lycoming Creek near Trout Run, Pa., for the year ending Sept. 30, 1920. [Drainage area, 185 square miles.] Discharge in second-feet. Month. Per Run-off in Maximum. Minimum. Mean. square inches. mile. 245 35 90.0 0.486 0.58 November ...... 1,480 165 475 2.57 2.87 435 38 182 .984 1.13 January ...... 60 28 42.8 .231 .27 February...... 131 44 69.0 .373 .40 2,680 57 900 4.86 5.60 April...... 585 245 383 2.07 2.31 May...... 245 71 157 .849 .98 335 43 91.5 .495 .55 July...... 94 20 41.3 .223 .26 245 18 46.6 .252 .29 September ...... 118 19 37.8 .204 .23 2,660 18 210 1.14 15.45 302 SURFACE WATER SUPPLY, 1919-1920, PART I. JUNIATA RIVER AT NEWPORT, PA. LOCATION, At four-span steel highway bridge at Newport, Perry County. DRAINAGE AREA. 3,380 square miles. RECORDS AVAILABLE. March 21, 1899, to July 14, 1906, and January 7, 1907, to September 30, 1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain-gage attached to downstream side of bridge; read by A. R. Bortel. Elevation of zero of gage 363.32 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Banks are high and not subject to overflow. Bed is composed of hard material. Low-water control is at a low riffle about 400 feet below gage. Stage-discharge relation changed slightly by the construction of a fish trap on control in 1919. EXTREMES OF DISCHARGE. Maximum stage recorded, during the year ending Sep tember 30, 1919, 17.36 feet at 9 a. m. and 11.30 a. m. May 23 (discharge, 57,800 second-feet); minimum stage, 3.08 feet several days in October and at 5 p. m. November 17 (discharge, 775 second-feet). Maximum open-water stage recorded during the year ending September 30, 1920, 19.1 feet at 5 p. m. March 13 (discharge, 67,200 second-feet); a stage of 20.9 feet was observd at 5 p. m. March 6, but the water was held back by an ice jam; minimum stage, 3.10 feet at 5. p. m. July 27, (discharge, 780 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation practically permanent throughout each year, except as affected by ice. Two rating curves used, both well defined between 10,000 and 70,000 second-feet, and fairly well defined below 10,000 second-feet. Gage read to tenths twice daily; during high stages more frequently. Daily discharge ascertained by applying daily mean gage height to rating table. Records good, except those for low stages, which are fair. Discharge measurements of Juniata River at Newport, Pa., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Sept. 11 3.50 1,450 Feb. 4» 6.70 2.140 May 17 4.82 4,970 1920. 22 O. W. Hartwell ...... 4.50 3,740 Jan. 13« 6.02 4,530 .....do...... 3.76 2,010 a Measurement made through incomplete ice cover. * Measurement made through complete ice cover. SUSQUEHANNA EIVEE BASIN. 303 Daily discharge, in second-feet, of Juniata River at Newport, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 933 4,160 1,650 2,760 3,170 6,530 5,920 2,760 5,030 2,620 2,110 1,760 2...... 1,290 1,230 4,160 2,490 8,720 5,030 3,030 4,740 2,360 2,110 1 440 3...... 1,100 3,030 1,290 8,720 2,620 8,400 4,740 4,160 4,160 2,230 1,990 l'880 4...... 1,290 2,230 1,540 9,040 2,230 7,460 3,870 3,870 3,590 1,990 1,760 1 880 5...... 1,100 1,990 1,290 7,770 2,360 6,840 3,590 3,450 3,310 1,760 1,330 i fwin 6...... 1,100 1,990 1,290 5, 620 2,360 5,920 3,030 3,310 2,900 1,330 1,990 1 KJft 7...... 1,880 2,230 1,650 5,620 2,110 5,620 3,450 3,030 2,900 1,760 4,450 1,440 8...... 1,650 1,990 1,020 4,740 2,110 5,030 3,310 3,030 2,900 1,540 3,450 965 9...... 1,540 1,760 1,290 5,030 1,880 6,530 2,760 3,590 3,590 2,110 2,490 885 10...... 1 **4A 1,760 1,020 3,870 1,880 9,360 2,620 9,360 3,590 1,990 2,110 1 "UO 11...... 1 *\4rt 1,760 1,540 1,330 10 000 2,490 26,300 3,870 1,540 i *un 12...... 1,290 1,200 1,990 3,450 1 880 8,400 3,030 25,100 4,160 1,990 1,240 2,490 13...... 1,020 i 9on 3,030 2,760 2,110 7 i crt 3,030 16,100 3,030 i oon 1,760 14...... 775 1 KA(\ 4,160 2,110 2,230 5,920 3,170 11,400 2,620 1,760 1,540 1 44fl 15...... 77*; 1,290 5,320 2,620 3,590 5,320 2,760 9,040 3,870 1,330 1,540 1 A4A 16...... 853 1,290 7,150 2,760 4,450 4,740 2,900 7,460 3,590 7,770 1,760 1 140 17...... 775 853 5,920 2,760 4,450 6,220 3,870 6,840 3,870 6,840 2,620 1)330 18...... 775 3,870 4,450 3,310 3,450 7,770 5,320 7,770 3,870 5,620 7,460 1 AAf\ 19...... 775 4,450 3,590 3,590 2,900 8,400 5,620 7,460 3,030 3,870 8,720 i ian 20...... QOO 4,160 3,030 7,770 4,740 6,840 2,490 3,170 9,360 1 140 21...... QOO 3,170 2,760 3,870 2,230 7 1 SA 4,740 37,100 6,220 1,050 22...... 1,020 2,360 3,310 3,170 2,3oO 6,530 4,450 51,600 1,760 5,620 5,320 Qfi^ 23...... 1 *\4ft 2,490 8,400 2,900 2 760 5,620 4,160 56,700 1,880 10,400 5,030 i inn 24...... 1)200 2,230 10,000 2 onn 3,870 35,800 1 >vtft 9,360 3,870 1 33A 25...... 775 1,990 11,400 6,220 3,170 4. 74/1 3,310 22,600 5,620 3,030 1 440 26...... 1 9on .1,650 Q 3fin 6,220 5,030 4,160 3,450 16,500 1,990 4,160 2,230 1,760 27...... l)290 i oon 8,080 5,320 4,160 2 900 12,500 3,870 3,170 2,490 1 140 28...... 1 540 1 540 6,530 4 74.fl 6,530 8,720 3)030 9,690 15,000 2,900 2,230 1 140 29...... 1)760 1, 760 5,320 3,870 9,040 2,760 7,770 7,150 2,490 2,620 l)050 30...... 1,760 4,450 3,870 7,770 2,490 6,840 3,870 2,110 2,620 1 * 140 31...... 1 "An 4,160 3,170 6,530 5,920 2,230' 2,620 1919-20. 1...... 920 3,580 7,440 2,000 1,500 6,480 7 120 1,680 1,900 1,180 2 CAA 2...... 1,180 6,170 6,170 2,500 1,900 1,500 5,550 9,360 1,900 1,900 1,080 9 NOTE. Discharge Jan. 5 and Feb. 17,1919, estimated from gage-height graph. Discharge Jan. 3 to Mar. 6, 1920,»20, estimated,c because of ice, from discharge measurements, weather records, and study of gage-height graph. anh. 304 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Juniata River at Newport, Pa., for the years ending September SO, 1919 and 1920. [Drainage area, 3,380 square miles.] Discharge in second-feet. Run-off Month:. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 1,880 775 1,210 0.358 0.41 4.450 853 2,260 .669 .75 11,400 1,020 4,110 1.22 1.41 January...... 9,040 2,110 4,410 1.30 1.50 8,080 1,330 3,050 .902 .94 March...... It), 000 4,160 6,830 2.02 2.33 April...... 5,920 2,490 3,680 1.09 1.22 May...... 56.700 3.030 13,800 4.08 4.70 15,000 1,640 3,760 1.11 1.24 July...... 10,400 1,330 3,560 1.05 1.21 9,360 1,240 3,230 .956 1.10 2,490 885 1,420 .420 .47 The year...... 56,700 775 4,300 1.27 17.24 1919-20. 4,930 920 2,200 .651 .75 14,600 2,370 5,520 1.63 1.82 11,400 2,880 5,470 1.62 1.87 1 5,000 1,700 2,770 .820 .94 3,800 1,900 2,890 .855 .92 March...... 59,900 1,500 18,200 5.38 6.20 April...... 17,600 5,550 9,590 2.84 3.17 May...... 9,360 2,130 4,690 1.39 1.60 15,400 1,680 3,930 1.16 1.29 July...... 2,620 850 1,610 .476 .55 7,760 1,000 2,940 .870 1.00 8,080 1,370 3,390 1.00 1.12 59,900 850 5,270 1.56 21.23 FRANKSTOWN BRANCH OF JTJNIATA RIVER AT WILLIAMSBTJRG, PA. LOCATION. At two-span steel highway bridge at Williamsburg, Blair County. DRAINAGE AREA. 295 square miles. HECORDS AVAILABLE. October 24, 1916, to September 30, 1920. Records prior to October 1, 1919, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to upstream side of bridge; read by E. E. Ehule. Ele vation of zero of gage 831.78 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CQNTEOL. Banks are high but subject to overflow at extremely high stages. Bed is composed of mud, gravel, and small boulders. Control for low stages is a water main, crossing the stream diagonally, about 150 feet below gage; permanent. Control for medium and high stages is at the first of a series of riffles about 450 feet below the water main; probably permanent. EXTREMES OP DISCHARGE. Maximum stage recorded during the year ending Septem ber 30, 1920,10.25 feet at 8 a. m. March 13 (discharge, about 6,700 second-feet); minimum stage, 1.58 feet October 4 and 5 (discharge, 74 second-feet). ICE. Stage-discharge relation slightly affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year; not affected by ice. Rating curve well defined between 70 and 2,000 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good. StTSQUEHANNA BIVEB BASIN. 305 Discharge measurements of Franksiown Branch of Juniata River at Williamsburg, Pa., during the year ending September SO, 1920. Gage Dls. Gage Dis Date. Made by- height. charge. Date. Made by height. charge. Feet. Sec.-ft. Feet. Sec.-ft. Jan. 19 2.26 208 4.82 1.230 Feb. 11 2.29 216 17 .....do...... 5.95 1,930 Daily discharge, in second-feet, of Frankstown Branch of Juniata River at Williamsburgt Pa., for the year ending September SO, 1920. Day Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 85 527 457 204 142 193 457 1,050 171 193 146 171 2...... 92 1,400 395 112 150 193 492 767 150 182 109 138 3...... 85 767 351 103 215 324 547 682 150 351 98 130 4...... 76 564 310 103 237 724 855 602 171 204 85 115 5...... 74 527 310 112 193 2,430 1,800 527 425 171 85 115 6...... 146 395 284 126 237 2,110 1,160 457 260 150 171 351 7...... 150 337 527 146 237 1,220 1,050 425 204 160 193 272 8...... 94 310 602 171 237 855 855 380 182 182 351 171 9...... 94 284 1,340 527 215 682 724 351 226 142 260 204 10...... 171 260 1 Aftft R11 215 1,280 602 324 182 130 855 1,520 11...... 146 284 767 527 215 2,430 564 297 171 128 310 682 12...... 171 324 682 380 237 4,710 682 337 160 142 237 527 13...... 150 492 682 365 248 5,500 1,050 492 160 123 248 380 14...... 126 337 767 272 248 2,350 724 395 237 119 215 284 15...... 260 310 602 237 425 1,460 682 337 182 126 171 260 16...... 337 284 492 248 310 1,660 724 297 564 193 160 237 17...... 310 272 492 260 337 2,870 1,730 284 1,660 123 150 215 18...... 204 260 457 237 365 1,800 1,460 284 1,280 126 527 193 19...... 171 237 395 204 457 1,520 1,100 284 767 204 365 171 20...... 150 226 337 215 310 1,280 900 284 564 134 284 150 21...... 140 204 337 215 324 1,000 1,520 360 602 119 260 150 22...... 138 204 284 204 297 855 1,160 300 395 110 237 148 23...... 134 204 284 193 297 900 1,050 260 380 109 204 136 24...... 160 204 284 193 284 1,050 900 240 324 112 171 130 25...... 142 215 272 193 260 1,100 724 237 272 110 160 148 26...... 140 811 260 171 193 1,220 602 215 248 102 160 130 27...... 193 2,350 260 171 171 1,050 724 204 226 98 148 124 28...... *...... 682 950 260 182 193 855 950 193 204 94 150 492 29...... 380 682 237 193 204 682 767 182 193 90 150 215 30...... 297 602 204 182 564 640 171 193 85 142 564 31...... 204 9fU 492 171 140 324 NOTE. Discharge May 21-24 estimated; no gage-height record. 102721 23 WSP 501 20 306 SUKFACE WATBE SUPPLY, I91&-192Q, PART I. Monthly discharge of Frankstown Branch of Juniata -River at Williamsburg, Pa., for the year ending September SO, 1920. [Drainage area, 295 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 682 74 188 0.637 0.73 2,350 204 494 1.67 1.86 December...... 1,400 204 469 1.59 1.83 811 103 241 .817 .94 457 142 257 .871 .94 March ...... 5,500 193 1,460 4.95 5.71 April...... 1,800 457 904 3.06 3.41 May...... 1,050 171 367 1.24 1.43 1,660 150 363 1.23 1.37 July...... 351 85 144 .488 .56 855 85 230 .780 .90 1,520 115 284 .963 1.07 5,500 74 451 1.53 20.75 RAYSTOWN BRANCH OF JTTNIATA RIVER AT SAXTON, PA. LOCATION. At two-span steel highway bridge at Saxton, Bedford County. DRAINAGE AREA. 790 square miles. RECORDS'AVAILABLE. August 31, 1911, to September 30, 1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridge; read by D. R. JenHns. Elevation of zero of gage 789.91 feet, United States Geological Survey datum. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Banks are subject to overflow during high stages. Con trol is at a heavy boulder riffle about 350 feet below gage; probably permanent. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Sept ember 30,1919,10.56 feet at 2 p. m. and 5 p. m. May 22 (discharge, 17,800 second- feet); minimum stage, 0.70 foot October 16-24 (discharge, 110 second-feet). Maximum stage recorded during the year ending September 30, 1920, 12.0 feet at 9 p. m. March 5 (discharge, 22,700 second-feet); minimum stage 0.95 foot on October 3 (discharge, 150 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent except as affected by ice January 4r-10 and January 15 to March 3, 1920. Rating curve fairly well defined below 1,000 second-feet and well defined between 1,000 and 22,000 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily dis charge ascertained by applying daily mean gage height to rating table. Records good, except those for low stages, which are fair. Discharge measurements of Raystown Branch of Juniata River at Saxton, Pa., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. Aug. 11 1.30 226 Mar. 36 H. B. Graves...... 2.30 607 May 21 0. W.Hartwell...... 2.73 948 1920. 21 2.74 1,050 Jan. 20a H. B. Graves...... 3.99 451 Aug. 28 .....do...... 1.67 392 Feb. lOo .....do...... 2.93 581 a Measurement made through complete ice cover. 6 Measurement made through incomplete ice cover. SUSQUEHANNA BIVER BASIN. 307 Daily discharge, in second-feet, of Raystown Branch of Juniata River at Saxton, Jfa.,/or the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 141 298 177 1,600 420 775 775 356 658 265 398 250 2...... 141 316 177 3,260 398 1,600 695 463 552 377 280 223 3...... 141 280 177 3.930 336 2,100 620 620 494 298 236 199 4...... 141 280 158 3,100 377 1,840 552 586 442 223 199 199 5...... 125 265 158 1,600 377 1,600 494 552 420 188 211 199 6...... 125 211 177 1,360 356 1,310 494 494 ' 398 735 250 188 7...... 141 177 177 695 298 1,000 442 494 398 377 494 177 8...... 141 158 177 695 280 860 398 586 463 377 463 177 9...... 150 158 177 775 280 1,600 356 1,100 1,000 265 316 1«8 10...... 150 158 188 586* 280 2,800 316 6,000 2,100 223 265 168 11...... 141 158 250 420 250 2,370 336 8,740 1,840 255 236 199 12...... 125. 141 1,720 336 223 1,840 420 5,800 905 336 211 223 13...... 125 141 1,720 280 236 1,600 523 3-, 420 523 298 223 199 14...... 125 141 2,370 280 398 1,310 442 2,370 377 818 265 177 IS...... 125 141 2,230 250 818 1,100 398 1,840 420 1,200 280 168 16...... 110 141 1,840 265 250 1, 050 494 1,840 905 2,950 265 158 17...... 110 141 1,600 356 356 1,360 1,420 1,840 860 1,840 356 158 18...... 110 168 1,310 494 463 1,720 1,420 2,370 463 775 1,420 158 19...... 110 223 860 818 398 1,600 1,200 2,100 398 552 1,000 150 20...... 110 298 586 377 1 fiAA 1,100 1,720 356 494 860 150 21...... 110 265 442 ftCO 356 950 377 442 463 150 22...... 110 223 620 420 775 860 15,900 420 523 398 158 23...... 110 211 3,100 398 586 775 9,650 336 775 658 177 24...... 110 199 3,260 1,100 4.JO A AS 5,400 280 1,310 523 250 25...... 118 199 2,370 463 71**. 735 4,280 265 494 356 250 26...... 141 199 2,100 463 A CO 586 3.260 250 398 280 211 27...... 177 177 1,840 1,100 1,100 A CO 494 2,650 1 600 336 2-50 177 1 CO Qfl = 28 188 1,480 SI Q 1 600 442 1,720 298 236 168 29...... 158 199 1,150 81 fi 1,'60Q 298 223 158 30...... 188 177 818 1,100 398 336 463 223 158 31...... 211 620 . 523 QAC 735 552 223 1919-20. 1...... 1,600 OAO 400 600 AAE 2 100 QCA 442 177 420 2...... 158 2,100 1,260 OAQ CAA 700 735 336 420 188 398 3...... 1 CA 2,510 1 AKA 077 750 AflA 620 2 o?fi qcc 463 223 316 4...... 1,720 818 QAA CAA 2 OAA 658 1 840 775 211 280 5...... 177 1.200 658 360 600 9 JOA 1 480 l!,480 695 620 199 280 6...... 905 523 320 CAA 9,650 1,100 442 199 1,150 7...... 168 586 620 AAf\ 4,640 3.260 1,150 658 35tj 523 2,650 1 i CA OOfl OAA ACA 8...... 188 523 440 2 2 1,000 552 316 1,050 1,050 9...... 188 463 750 CAA 2 07A 2,650 QIC AQA. 316 586 775 10...... 177 420 2,650 2,200 600 3,420 1,970 695 442 316 695 1,202 11...... 177 398 2.650 2,510 650 7 860 1 840 658 398 298 552 2,100 12...... 211 463 2,100 650 9^880 620 377 280 552 1,360 13...... 442 552 1,840 1,360 600 I A QAA 1 600 1 1 KA 398 280 494 1,000 14...... 463 695 1,970 QKA CEA 8 OAA 1*720 3,260 398 280 442 818 15...... 420 620 1 840 7KA KAA 5,020 1,480 2 ftCA 620 280 420 620 16...... 199 523 1,720 AAA E.£.ft 3 AOA 1,480 2,100 5,800 298 620 523 AQA (.- QQQ OXK 17...... 442 1 840 650 4,280 1 840 1 fifm 7 230 818 442 18...... vn 494 1,480 550 OCA 4,280 2' ^7ft 1,310 7,020 236 1,840 356 19...... 442 442 950 500 1,000 4,100 4,830 223 2,370 336 20...... 336 398 775 4JA 1,200 3,260 2,100 1,050 2,950 250 1,255 316 21...... 356 420 1,100 2 AC A 2,100 1,050 2,370 223 950 298 22...... 280 315 735 ACA 2,650 2,510 QAC. 2,100 .199 818 280 771; AAf\ Q7A OOA, 23...... 280 298 800 2 2 695 658 265 24...... 298 280 658 CAA 7EA 2 OQA 2,100 ftOA 1,250 177 552 250 25...... 298 qiA CEO CAA 700 2,100 1,600 KC*> 1,150 177 463 250 26...... 280 658 552 500 700 o oaA 1,360 ceo 1,100 177 398 27...... 316 2,650 AQA CAA fiCA 2 -IAA 1,360 552 775 177 356 250 28...... 463 3,930 494 600 1,970 1 600 463 620 168 336 377 29...... 442 2,370 AQA 460 550 1,720 1*840 442 193 168 336 298 30...... 658 1,200 463 1,360 1,'720 420 860 168 420 356 »1...... AOA 442 AA(\ 1,200 3QS 168 4QJ. NOTE. Discharge Jan. 4-10 and Jan. 15 to Mar. 3,1920, estimated, because of ice, from discharga measure meats, weather records, and study of gage-height graph. 308 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Raystown Branch of Juniata River at Saxton, Pa., for the years ending Sept. SO, 1919 and 1920. [Drainage area, 790 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October ...... 211 110 135 0.171 0.20 316 141 201 .254 .28 3,260 158 1,100 1.39 1.60 3,930 250 1,020 1.29 1.49 1,100 223 415 .525 .55 March...... 2,800 586 1,340 1.70 1.96 1,420 316 640 .810 .90 May...... 15,900 356 3,090 3.91 4.51 2,100 250 627 .794 .89 July...... 2,950 188 605 .766 .88 1,420 199 389 .492 .57 250 150 185 .234 .26 The year...... 15,900 110 820 1.04 14.09 1919-20. October ...... 658 150 306 .387 .45 3,930 280 987 1.25 1.40 2,650 442 1,150 1.46 1.68 2,510 320 668 .846 .98 1,200 400 672 '.851 .92 10,800 600 3,930 4.97 5.73 3,590 620 1,850 2.34 2.61 3,260 398 1,210 1.53 1.76 7,230 336 1,590 2.01 2.24 July...... 775 168 295 .373 .43 2,370 177 619 .784 .90 2,650 250 642 .813 .91 10,800 ISO- 1,160 1.47 20.01 TUSCARORA CREEK NEAR PORT ROYAL, PA. LOCATION. At single-span steel highway bridge 2 miles southwest of Port Royal, Juniata County. DRAINAGE AREA. 205 square miles. RECORDS AVAILABLE. August 21, 1911, to September 30, 1920. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to upstream side of bridge; read by Stuart Groninger. DISCHARGE MEASUREMENTS. Made from downstream aide of bridge or by wading. CHANNEL AND CONTROL. Banks are low but not subject to overflow except during extremely high stages. Bed is composed of gravel and rocks. Control is at a riffle about 500 feet below gage; practically permanent. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Sep tember 30, 1919, 12.25 feet at 9.20 a. m. and 11 a. m. May 21 (discharge from ex tension of rating curve, 9,550 second-feet); minimum stage, 2.18 feet at 7 a. m. September 20 (discharge, 18 second-feet). Maximum stage recorded during the year ending September 30,1920, estimated from hydrograph, 12.6 feet at 4 a. m. March 6; stage-discharge relation affected by ice, discharge not determined; minimum stage, 2.20 feet at 6.30 a. m. July 30 and 7 a. m. August 7 (discharge, 20 second-feet). ICE. Stage-discharge relation usually affected by ice. STJSQUEHAHNA RIVER BASIN. 309 ACCURACY.' Stage-discharge relation permanent except as affected by ice January 11- 20, February 11, 12, and December 19, 1919, to March 13, 1920. Eating curve fairly well defined below 100 second-feet and well denned between 100 and 5,000 second-feet. Gage read to hundredths twice daily; during high stages more frequently. Daily discharge ascertained by applying daily mean gage height to rating table. Records good, except those for low stages, which are fair. Discharge measurements of Tuscarora Creek near Port Royal, Pa., during the years ending Sept. SO, 1919 and 1920. Gage Dis Gage Dis Date. Made by height. charge. Date. Made by- height. charge. 1919. Feet. Sec.-ft. 1920. Feet. Sec.-ft. 2.52 61 Mar. 4» 4 91 233 May 19 3.16 172 1920. Jan. 16 * 3.59 118 Feb. 13 b .....do...... 3.74 111 Measurement made by wading. 6 Measurement made through complete ice cover. Daily discharge, in second-feet, of Tuscarora Creek near Port Royal, Pa., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept, 1918-19. 1...... 64 255 96 270 192 615 405 136 242 102 140 82 2...... 67 180 90 1,490 150 488 332 270 218 90 120 79 3...... 57 140 85 950 150 425 285 205 192 84 96 60 4...... 54 118 85 615 ISO 350 270 170 170 76 84 57 5...... 60 108 CM 332 170 wn 255 160 160 74 Qfi 54 6...... 170 97 79 350 150 315 230 150 160 ISO 300 56 7...... 192 86 74 368 96 255 205 160 150 110 242 49 8...... 104 84 76 350 140 230 192 180 160 84 136 49 9...... 84 79 79 300 102 780 170 300 170 64 96 47 10...... 76 76 73 270 90 1,080 160 1,870 136 72 82 49 11...... 73 76 85 240 85 670 160 1,720 120 114 82 ISO 12...... 67 72 315 200 85 465 242 950 108 84 72 120 13...... 66 70 270 200 106 385 ISO 670 100 90 72 73 14...... 69 67 510 220 285 315 160 488 98 78 67 57 15...... 62 65 535 240 510 270 160 385 588 170 65 56 16...... 58 65 405 260 332 300 192 332 385 670 65 52 17...... 57 67 315 280 255 510 270 332 170 218 205 60 18...... 57 1,790 255 260 230 445 218 300 124 136 445 47 19...... 53 560 218 260 170 385 192 230 104 120 588 43 20...... u 368 ISO 240 ISO 368 180 270 97 385 285 19 21...... 79 255 180 230 180 315 170 8,250 160 1,080 170 27 22...... 67 205 255 218 170 285 160 5,350 88 950 368 49 23...... 60 170 2,040 218 218 255 160 3,780 79 3,350 230 86 24...... 52 150 835 835 242 242 192 1,870 72 835 150 100 25...... 52 140 950 535 270 218 180 1,210 73 445 120 65 26...... 73 128 615 425 1,080 205 150 835 92 300 100 52 27...... 130 114 445 350 642 315 138 615 642 230 86 49 28...... 91 112 368 285 465 1,720 138 465 315 218 84 42 29...... 73 132 315 255 890 132 385 160 170 73 42 30...... 116 120 255 218 615 122 315 122 136 76 42 31...... 488 230 205 488 270 120 76 310 SUBFACE WATEB SUPPLY, 1919^-1920, PART I. Daily discharge, in second-feet, of Tuscarora, Creek near Port Royal, Pa., for ike years ending Sept. 30, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 37 192 242 75 70 120 315 560 79 57 27 218 2...... 42 835 192 70 75 140 350 368 79 60 39 106 3...... 39 535 160 65 75 180 350 315 78 70 34 92 42 300 110 60 65 220 725 285 88 62 30 7§ 39 285 120 55 60 650 1,340 255 160 52 27 72 6...... 45 205 132 55 60 2,200 1,080 230 160 45 25 780 7...... 54 170 192 55 90 1,100 890 205 102 49 32 1,560 8...... 52 150 285 85 100 700 670 192 82 85 140 445 9...... 40 132 725 220 100 550 510 180 84 67 180 285 10...... 60 118 1,080 700 95 1,000 425 160 76 50 97 535 U...... 69 218 510 300 90 1,800 368 160 69 49 230 332 12...... 73 350 368 240 90 2,800 315 160 65 92 150 270 13...... 97 300 425 180 110 5,500 510 230 67 65 535 588 14...... 79 242 1,140 160 110 2,760 368 315 97 56 150 285 15...... 130 205 725 140 160 1,720 300 230 88 57 92 192 16...... 205 170 385 110 220 1,640 300 180 79 56 76 160 17...... 230 150 332 100 280 2,400 835 170 192- 54 386 140 18...... 170 140 218 90 220 1,720 950 160 835 49 332 112 19...... 120 130 160 85 280 1,340 670 160 270 43 510 97 20...... 97 104 120 75 300 1,020 560 170 170 43 315 88 21...... 80 94 100 70 240 890 950 192 160 43 615 85 22...... 76 94 90 65 200 950 950 170 140 37 425 79 23...... 76 90 90 70 200 0§3 780 136 112 39 270 73 24...... 91 85 100 75 180 950 560 130 104 39 192 73 25...... 88 84 110 70 160 890 425 136 136 44 150 70 26...... 73 205 110 65 140 780 368 124 94 49 122 67 27...... 73 1.080 110 65 120 890 368 112 76 37 102 66 28...... 315 588 100 65 120 615 332 104 69 34 94 84 29...... 192 368 90 60 100 510 285 94 67 27 110 69 30...... 140 350 90 60 405 242 88 61 27 150 124 o-t 128 on 65 ocn 88 26 218 NOTE. Discharge Jan. 11-20, Feb. 11, 12, and Dec. 19, 1919, to Mar. 13, 1920, estimated because of ice, from discharge measurements, weather records, and study of gage-height graph. Monthly discharge of Tuscarora Creek near Port Royal, Pa., for the years ending Sept. 30, 1919 and 1920. [Drainage area, 205 square miles.] Discharge in second-feet. Run-oflE Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 488 52 91 0.444 0.512 1,790 65 198 .966 1.08 2,010 73 335 1.63 1.88 1,490 200 370 1.80 2.08 1,080 85 247 1.20 1.25 1,720 205 468 2.28 2.63 405 122 200 .976 1.09 May...... 8,250 136 1,050 5.12 5.90 642 72 182 .888 .991 July...... 3,350 64 350 1.71 1.97 588 65 157 .766 .883 180 19 62 .302 .337 8,250 19 311 1.52 20.60 1919-20. 315 37 98.5 .480 .55 1,080 84 266 1.30 1.45 1,140 80 280 1.37 1.58 700 55 118 .576 .66 300 60 142 .693 .75 5,500 120 1,220 5.95 6.86 1,340 242 570 2.78 3.11 560 88 195 .951 1.10 835 61 131 .639 .71 July...... 92 26 50.4 .246 .28 615 25 189 .922 1.06 1,560 66 241 1.18 1.32 5,500 25 292 1.42 19.43 SUSQUEHANNA EIVEE BASIN. 311 YELLOW BREECHES CREEK AT OLMSTED'S MILL, PA. LOCATION. At single-span steel highway bridge, just below Olmsted's milldam, 1 mile south of White Hill, Cumberland County, DRAINAGE AREA. 223 square miles. RECORDS AVAILABLE. March 23 to October 31,1909, and January 22,1910, to Decem ber 31, 1919, when the station was discontinued. Records prior to October 1, 1918, are contained in the annual reports of the Water Supply Commission of Pennsylvania. GAGE. Chain attached to downstream side of bridge; read by C. A. Hertzler. DISCHARGE MEASUREMENTS. Made from downstream side of bridge. CHANNEL AND CONTROL. Banks are high and not subject to overflow. Control is at a riffle about l,000xfeet below gage, where bed is composed of gravel; may shift ' slightly. EXTREMES OF DISCHARGE. Maximum stage recorded during year ending September 30, 1919, 6.82 feet at 8.30 p. m. July 23, caused by failure of the Upper Mount Holly dam (discharge, 3,540 second-feet); minimum stage, 0.67 foot at 8 a. m. December 11 (discharge, 103 second-feet). Maximum stage recorded during the period October 1 to December 31, 1919, 2.12 feet observed at 4.30 p. m. December 14 (discharge, 540 second-feet); mini mum stage, 0.85 foot at 6.30 p. m. October 11 (discharge, 136 second-feet). ICE. Stage-discharge relation seldom affected by ice. ACCURACY. Stage-discharge relation permanent throughout the period; not affected by ice. Rating curve well defined between 130 and 4,000 second-feet. Gag© read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good, except those for extremely low stages, which are fair. The following discharge measurement was made by Peterson and Landis: September 18, 1919: Gage height, 1.06 feet; discharge, 182 second-feet. Daily discharge, in second-feet, of Yellow Breeches Creek at Olmsted's Mill, Pa., for the period Oct. 1, 1918, to Dec. 31, 1919. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918. 1 134 200 141 260 275 378 412 275 308 200 308 275 2...... 136 152 150 500 260 360 378 342 308 186 290 245 3...... - 145 152 186 448 260 342 342 290 275 186 260 oon 4...... 136 160 147 360 260 325 360 245 275 186 275 215 5...... 130 162 141 275 260 342 342 260 260 170 275 6...... 136 145 136 342 245 325 308 245 430 172 1,900 7...... 162 152 145 308 245 290 325 245 308 275 620 200 8...... 139 143 150 290 230 308 308 245 308 215 378 230 9...... '.... 139 143 141 290 215 660 290 260 325 186 308 215 10...... 154 143 145 245 230 705 275 540 325 200 290 215 11...... 143 150 103 245 200 482 308 620 308 245 275 308 \Z...... 160 172 230 215 230 430 500 482 245 215 275 230 13...... 154 147 200 215 230 412 360 430 260 200 275 200 14...... 154 143 230 245 275 378 325 412 245 200 260 15...... 139 160 308 230 430 378 308 378 260 275 245 186 16...... 150 157 260 230 308 395 325 360 580 412 260 200 17...... 154 152 200 230 275 500 620 342 308 325 360 186 18...... 162 430 186 325 245 448 395 360 260 260 705 172 19...... 162 308 172 360 245 395 360 325 260 275 750 172 20...... 150 215 - 172 275 230 360 342 325 245 840 465 172 21...... 164 186 172 260 245 360 342 980 215 930 360 -tOft 22...... :...... 150 164 230 260 245 325 308 885 215 620 325 172 23...... 162 145 620 275 342 308 325 7.50 215 2.390 308 *>t*i 24...... 147 139 360 660 342 325 325 705 200 1,540 291) 01 ft 25...... 157 147 4l2 448 308 308 308 580 200 750 275- 186 26...... 162 145 325 395 395 308 290 500 215 540 157 27...... 154 147 275 378 342 360 275 448 342 500 £60 170 28...... 162 162 260 342 308 '500705 275 430 275 448 245 -i 152 29...... 154 157 230 325 275 378 215 395 260 160 30...... 160 154 230 308 430 275 360 200 342 245 167 31...... 245 230 290 430 342 342 245 312 SURFACE WATER SUPPLY, 1919-1920, PART I. Daily discharge, in second-feet, of Yellow Breeches Creek tit Olmsted's Mill, Pa., for the period Oct. 1, 1918, to Dec. 31,1919 Continued. Day. Oct. Nov. Dec. Day. Oct. Nov. Dec. Day. Oct. Nov. Dec* 1919. 11...... 152 200 308 21...... 167 200 290 1...... 167 186 245 12...... 186 275 275 22...... 157 186 290 2...... 164 325 245 13...... 215 378 308 23...... 167 186 290 3...... 167 275 230 14...... 186 275 540 24...... 186 200 275 4...... 167 200 200 15i...... 215 245 395 25...... 172 200 230 5...... 160 230 200 16...... 200 200 260 26...... 170 290 260 6...... 170 200 200 17...... 186 200 325 27...... 170 360 260 '7...... 162 186 215 18...... 172 200 260 28...... 172 260 230 8...... 170 172 260 19...... 170 186 290 29...... 186 260 230 9...... 152 172 360 20...... 162 215 290 30...... 172 260 230 10...... tftd. 200 395 31....>.... 186 215 Monthly discharge of Yellow Breeches Creek at Olmsted's Mill, Pa., for the period Oct. 1, 1918, fo Dec. 31, 1919. [Drainage area, 223 square miles.) Discharge in second-feet. Run-oft Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. 245 130 153 0.686 0.791 430 139 171 .767 .856 620 103 222 1.00 1.15 660 215 317 1.42 1.64 February...... 430 200 274 1.23 1.28 705 290 406 1.82 2.10 April...... 620 275 339 1.52 1.70 May...... 980 245 430 1.93 2.22 580 200 280 1.26 1.41 July...... 2.390 170 452 2.03 2.34 1,900 245 382 1.71 1.97 308 152 202 .906 1.01 The year...... 2,390 103 303 1.36 18.47 1919. 215 152 174 .780 .90 378 172 231 1.04 1.16 540 200 277 1.24 1.43 SWATARA CREEK AT HARPERS, PA. LOCATION. At two-span steel highway bridge at Harpers, Lebanon County, 5 miles northwest of Annville. DRAINAGE AREA. 334 square miles. RECORDS AVAILABLE. December 17, 1918, to September 30, 1920. Records prior to October 1,1919, are contained in the annual reports of the Water Supply Com mission of Pennsylvania. GAGE. Chain gage attached to downstream side of bridgej; read by J. A. Koons and Elmer GK Shuey. DISCHARGE MEASUREMENTS. Made from downstream side of bridge or by wading. CHANNEL AND CONTROL. At low and medium stages the stream flows under the left span of the bridge. There is a flood plain under the right span which is covered by water during high stages. Outside of the flood plain both banks are high and are not overflowed. Bed is composed of culm and gravel. Con trol is at a riffle about 300 feet below gage; probably permanent. SUSQUEHANNA RIVER BASIN. 313 EXTREMES OP DISCHARGE. Maximum open-water stage during the year ending September" 30, 1920, estimated from hydrograph, 11.3 feet at 3 p. m. March 13 (discharge, 9,040 second-feet); a stage of 13.5 feet, estimated from hydrograph, was reached at midnight March 5-6, but the water was held back by an ice jam; minimum stage, 0.38 foot at 6.15 a. m. September 5 (discharge, 87 second-feet). ICE. Stage-discharge relation usually affected by ice. ACCURACT. Stage-discharge relation permanent throughout the year, except as affected by ice December 20, 1919, to March 10, 1920. Eating curve fairly well defined between 100 and 6,000 second-feet. Gage read to hundredths twice ' daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good, except for low stages, for which they are fair. Discharge measurements of Swatara River at Harpers, Pa., during year ending Sept, Gage Dis Gage Dis Date. Made by height. charge. Date. Made by charge. Feet. Sec.-ft. Feet. Sec.-ft. Nov. 21 1.68 426 May 26 0.97 215 1.73 263 28 O.W. Hartwell...... 87 182 Feb. 18o .....do...... 1.99 248 Aug. 18 .....do...... 3.30 1,210 Mar. 17 8.69 5,940 Sept. 16f> .....do...... 95 190 18 .....do...... 6.09 3,380 216 .....do...... 64 123 Apr. 17 .....do...... 3.80 1,670 o Measurement made through incomplete ice cover. 6 Measurement made by wading 75 feet below gage. Daily discharge, in second-feet, of Swatara Creek at Harpers, Pa., for the year ending Sept. 30, 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 95 348 945 300 160 180 745 745 130 130 460 120 2...... 183 845 745 300 160 200 1,360 560 130 112 196 103 3...... 139 605 695 300 160 240 1,500 460 139 520 120 102 4...... 120 520 560 280 160 2,000 1,290 420 150 312 103 O7 5...... 103 1,780 560 260 180 4,800 2,370 382 172 183 99 92 6...... 103 1,050 560 260 200 5,500 2,610 365 264 139 112 dfin 7...... 103 845 520 260 220 5,500 1,920 330 172 139 112 1,920 8...... 103 650 330 280 240 4,800 1,500 348 150 196 183 695 9...... 103 540 1,430 300 260 4,200 1,170 348 120 160 130 /tin 10...... 103 460 1,780 340 260 2,400 995 312 120 120 120 695 11...... 103 520 1,360 320 280 3,750 R4.H 280 120 112 130 605 12...... 222 1.170 1,110 300 300 5,820 795 280 120 150 130 382 13...... 222 2,290 1,290 280 300 8.260 1,170 330 222 250 120 312 14...... 183 1,710 2,130 260 300 5,020 945 365 139 172 120 250 15...... 650 1,230 1,430 240 300 3,030 795 295 130 180 120 222 16...... 400 995 1,110 240 280 3,300 745 235 172 160 480 1£6 17...... 745 845 1,050 220 260 5,320 1,430 222 845 120 845 172 18...... 365 695 845 200 263 3,480 1 230 2fl8 2.130 120 995 172 19...... 295 500 701 200 94-rt 2,610 1^050 208 605 130 500 139 20...... 235 440 700 200 240 1,850 895 196 400 139 295 130 21...... 208 440 650 200 200 2,060 1,170 264 330 112 264 130 22...... 196 400 eoa 220 200 2,690 945 348 312 95 208 120 23...... 183 382 550 240 260 2.450 845 235 250 160 222 130 24...... 235 365 480 240 260 2,210 745 208 222 172 172 112 25...... 235 348 440 240 240 2,080 650 208 183 120 150 120 26...... 183 995 400 240 200 2,060 560 196 160 103 130 112 27...... 183 1,920 380 220 200 2,080 605 183 150 99 120 120 28...... 330 1,290 360 200 180 1,430 605 172 130 102 120 400 29...... 480 1,050 340 200 180 1,290 520 160 120 93 160 365 30...... 365 1,230 300 180 1,110 4fin 139 130 89 150 1,230 31...... 330 300 170 895 139 103 130 NOTE. Discharge Dec. 20 to Mar. 10 estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. Discharge July 15-16 estimated; no gage height record. 314 SURFACE WATER SUPPLY, 1919-1920, PART I. Monthly discharge of Swatara Creek at Harpers, Pa., for the year ending Sept. SO, 19$0. [Drainage area, 334 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 745 95 242 0.725 0.84 2,290 348 882 2.64 2.94 2,130 300 798 2.39 2.76 340 170 248 .742 .86 February...... 300 160 230 .689 .74 8,260 180 2,990 8.95 10.32 2,610 460 1,080 3.24 3.62 toy...... 745 139 295 .883 1.02 2,130 120 281 .841 .94 July 520 89 155 .464 .53 995 99 232 .695 .80 1,920 92 338 1.01 1.13 T he year ...... 8,260 89 650 1.95 26.50 LITTLE SWATARA CREEK NEAR PINE GROVE, PA. LOCATION. At single-span steel highway bridge, three-quarters of a mile upstream from mouth of creek and 1 mile southeast of Pine Grove, Schuylkill County. DRAINAGE AREA. 34 square miles. RECORDS AVAILABLE. November 18, J919, to September 30, 1920. G.AJGE. Chain gage attached to upstream side of bridge; read by Miss Lottie Mars. DISCHARGE MEASUREMENTS. Made from upstream side of bridge or by wading, CHANNEL AND CONTROL. Banks are of medium height; overflow begins At a stage of about 6 feet. Bed is composed of coarse gravel. Control is at a riffle, at the upstream end of an island, about 100 feet below the gage. Bed at control is coarse gravel; probably permanent. EXTREMES OF DISCHARGE. Maximum stage during the period, determined by levels, 8.9 feet at 4 a. m. March 6, stage-discharge relation affected by ice, discharge not determined; minimum stage, 1.28 feet several times in July (discharge, 7 second- feet). ICE. Stage-discharge relation usually affected by ice. ACCURACY. Stage-discharge relation permanent throughout the year* except as affected by ice December 16 to March 12. Rating curve fairly well defined below 100 second-feet and well denned between 100 and 500 second-feet. Gage read to hundredths twice daily. Daily discharge ascertained by applying daily mean gage height to rating table. Records good for medium stages. COOPERATION. Station is maintained in cooperation with J. G. White Management Corporation, New York City. Discharge measurements of Little JSwatara Creek near Pine Grove, Pa,, during the year ending Sept. SO, 1920. Gage Dis. Dis Date. Made by charge. Date. Made by height. charge. Feet. Sec.-ft. Feet. Sec.-ft. Nov. 18 2.09 « Measurement made by wadiag. & Measurement made through complete ice cover. StTSQUEHANNA RIVER BASIN. 315 Daily discharge, in second-feet, of Little Swatara Creek near Pine Grove, Pa., for the year ending Sept. SO, 1920. Day- Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1...... 92 19 13 8 75 68 12 15 46 18 2...... 85 19 13 10 174 48 13 21 24 14 3...... 72 19 16 19 161 43 19 58 18 11 4...... 64 24 19 250 170 41 14 29 15 15 5...... 82 24 19 750 286 38 24 21 12 13 6...... 54 28 28 1 'soo000 321 36 18 17 21 228 7...... 82 28 32 251 34 14 19 31 262 8...... 65 60 36 600 161 36 12 20 18 135 9...... 274 140 36 550 130 35 12 15 13 96 10...... 274 80 36 550 109 31 11 14 17 102 11...... 183 55 42 600 92 32 10 13 15 59 12...... 148 36 42 700 80 29 . 9 56 18 56 13...... 168 32 36 849 143 34 11 19 19 48 14...... 205 28 36 297 85 38 14 22 19 38 15...... 168 24 36 297 76 30 11 22 15 35 16...... 120 24 32 345 78 26 11 21 56 31 17...... 80 19 32 489 174 24 150 15 65 29 18...... 85 70 19 28 321 157 21 146 17 240 25 19...... 75 60 16 28 251 137 21 65 14 126 24 20...... 59 60 19 24 194 117 22 43 12 72 h 21 21...... 54- 60 19 24 183 135 27 41 10 64 18 22...... 44 60 19 32 183 96 29 32 9 48 17 23...... 43 ,g 24 48 216 89 22 29 34 38 17 24...... 37 55 24 36 216 78 22 24 14 31 15 25...... 36 48 19 28 194 67 21 22 10 26 17 26...... 143 36 19 19 176 61 18 21 10 27 15 27...... 205 32 24 , 8 176 68 17 18 9 22 17 28...... 157 24 24 8 139 65 14 16 8 25 23 29...... 126 16 19 8 124 54 14 14 7 26 15 30...... 139 16 19 100 54 14 18 8 23 205 31...... 19 16 87 14 54 19 NOTE. Discharge Dec. 16 to Mar. 12 estimated, because of ice, from discharge measurements, weather records, and study of gage-height graph. Monthly discharge of Little Swatara Creek near Pine Grove, Pa., for the year ending Sept. SO, 1920. [Drainage area, 34 square miles.] Discharge in second-feet. Run-off Month. Per in inches. Maximum. Minimum. Mean. square mile. 274 16 91 2.68 3.09 140 16 30 .882 1.02 February...... 48 8 27 .794 .86 1,000 8 344 10.12 11.67 April...... 321 54 125 3.68 4.11 May...... 68 14 29 .853 .98 150 9 28 .824 .92 July...... 58 7 20 .588 .68 240 12 39 1.15 1.33 September...... 262 11 54 1.59 1.77 316 SURFACE WATEB SUPPLY, 1919-1920, PART I. PATTTXENT RIVER BASIN. PATTTXENT RIVER NEAR BtTRTONSVILLE, MD. LOCATION. At Columbia Turnpike bridge, 1$ miles northeast of Burtonsville, Mont gomery County, and 4 miles northwest of Laurel. DRAINAGE AREA. 127 square miles. RECORDS AVAILABLE. July 21, 1911, to June 15, 1912 (records furnished by United States Engineer Office); July 21, 1913, to September 30, 1920. GAGE. Stevens water-stage recorder referred to a staff gage in three sections on left bank about 80 feet below highway bridge; prior to July 23, 1914, a vertical staff fastened to left side of bridge pier; datum of recorder is 1.29 feet below that of gage on pier. Recorder inspected by Columbus Brashears and Arthur Beall. DISCHARGE MEASUREMENTS. Made from bridge or by wading. . CHANNEL AND CONTROL. Banks are lined with trees and brush and are overflowed at stage of about 10 feet. Control is a flat gravel bar about 300 feet below bridge. Current is swift under bridge, but sluggish below bridge to control. EXTREMES OP DISCHARGE. Maximum stage during year ending September 30, 1919, 11.6 feet at 2 a. m., May 22 (discharge, 3,650 second-feet); minimum stage, 1.72 feet at 4 a. m., October 2 (discharge, 25 second-feet). Maximum stage during the year ending September 30, 1920, 11.6 feet at 11.30 p. m., March 5 (discharge, 3,650 second-feet); minimum stage, 2.10 feet Septem ber 22 (discharge, 38 second-feet). 1911-1920: Maximum stage recorded, 14.6 feet about 9 a. m., January 12, 1915 (discharge, from poorly denned rating curve, 5,100 second-feet); minimum stage, 0.18 foot August 25, 1911 (discharge, 6 second-feet). ICE. Stage-discharge relation affected by ice during severe winters only. ACCURACY. Stage-discharge relation changed during high water, August 18 to 21, 1919; affected by ice, December 18, 1919, to January 29, 1920. Rating curves well denned between 50 and 2,000 second-feet. Operation of water-stage recorder satisfactory throughout both years except for periods, July 22 to August 13, Octo ber 16-19, November 16-25, December 1-31, 1919; and January 1-31,1920. Daily discharge ascertained by use of discharge integrator, by hourly method, and by use of mean daily gage heights obtained by inspecting recorder graph. Records good. Discharge measurements ofPatuxent River near Burtonsville, Md., during the years ending Sept. 30, 1919 and 1920. Gage Dis Gage Dis Date. Made by- height. charge. Date. Made by height. charge* 1918. Feet. Sec,-ft. 1920. Feet. Sec.-ft. Dec. 13 2 20 83.7 Jan. 7 02.84 OS 7 1919...... do...... 2.18 79.1 2.32 89.8 « Stage-discharge relation affected by ice. PATUXENT RIVER BASIN. 317 Daily discharge, in second-feet, of Patwcent River near Burtonsville, Md., for ike yean ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... 35 56 40 204 86 287 120 152 114 72 167 128 2...... 32 50 39 611 81 172 115 247 111 69 162 115 3...... 37 44 39 732 74 135 112 150 105 68 158 108 4...... 36 45 39 244 81 116 110 133 97 68 153 102 5...... 39 43 38 153 98 115 141 135 96 66 153 102 6...... 38 45 37 152 82 176 130 197 172 64 150 100 7...... 39 41 38 130 82 132 114 144 121 64 144 100 8...... 39 40 67 108 151 268 63 139 100 9...... 40 41 42 122 60 695 108 430 353 60 136 97 10...... 39 42 56 115 57 358 102 678 141 75 133 115 11...... 40 41 115 125 55 218 242 313 122 214 128 260 12...... 40 241 65 172 216 116 82 133 381 13...... 39 36 84 119 65 156 246 181 113 75 136 121 14...... 36 108 120 140 142 160 1 %& 112 105 15...... 39 32 661 247 136 167 155 113 262 120 100 16...... 40 35 165 105 132 148 335 141 130 Ron 171 94 17...... 39 35 112 93 102 155 562 201 103 171 796 89 18...... S7 240 96 107 95 158 264 180 cu 410 346 84 19...... 40 69 82 , 87 141 201 152 94 979 312 76 20...... 39 47 78 114 84 135 175 140 105 422 162 76 21...... 45 43 70 106 84 135 161 i *yvft QOO 643 157 74 22...... 40 318 106 95 1.170 124 916 209 72 23...... 42 38 583 1OC 180 116 138 284 102 NOTE. Stage-discharge relation affected by ice Dec. 18, 1919, to Jan. 29. 1920; discharge estimated by study of weather records and comparison with records of flow of Monocacy River near Frederick. Recorder not working properly July 22 to Aug. 13, Oct. 16-19, Nov. 16-25, Dec. 1, 1919, to Jan. 29,1920; discharge estimated by study of weather records and comparison with Monocacy River near Frederick. Braced figures show mean discharge for periods included. 318 SURFACE WATEE SUPPLY, 191$-1920,, PART I. Monthly discharge ofPatuxent River near Burtonsville, Md.,for the years ending Sept. 30, 1919 and 1920. [Drainage area, 127 square miles.] Discharge in second-feet. > Run-oft Month. Per in inches. Maximum. Minimum. Mean. square mile. 1918-19. October...... 62 32 41.0 0.323 0.37 November...... 240 32 48.7 .383 .43 661 37 136 1.07 1.23 January ...... 732 93 169 1.33 1.53 February...... 247 55 102 .803 .84 695 108 180 1.42 1.64 815 102 196 1.54 1.72 May...... 1,550 124 277 2.18 2.51 353 81 134 1.06 1.& July...... 916 60 225 1.77 2.04 August...... 796 112 173 1.36 1.57 381 72 118 .929 1.04 The year ...... 1,550 32 151 1.19 16.10 1919-20. 240 77 113 .890 1.03 November...... 430 82 155 1.22 1.96 162 1.2S 1.48 160 1.26 1.45 February...... 1,230 142 386 3.04 3.28 1,860 128 347 2.73 3.15 April...... 645 127 220 1.73 1.93 May...... 275 101 139 1.09 1.26 385 80 147 1.16 1.29 July...... 528 72 141 1.11 1.28 968 72 184 1.45 1.61 September ...... 237 38 62.0 .488 .54 1,860 38 184 1. 45 ' 19.66 POTOMAC RIVER BASIN. POTOMAC BIVER AT POINT OF ROCKS, MD. LOCATION. At steel highway bridge at Point of Rocks, Frederick County, one-third mile below Catoctin Creek and 6 miles above Monocacy River. DRAINA.GE ABEA. 9,650 square miles. RECORDS AVAILABLE. February 17, 1895, to September 30, 1920. GAGE. Chain, attached to downstream side of left span of bridge; read by G. H. Hickman to December 31, 1919, and after that date by W. W. Compher. Datum constant since September 2, 1902; prior to this date datum was 0.45 foot higher than at present. Sea-level elevation of gage datum, 200.54 feet. DISCHARGE MEASUREMENTS. Made from bridge. CHANNEL AND CONTROL. Practically permanent. The control is a legde a few hundred feet below the station, the ledge extending completely across the river, except for one relatively unimportant channel. EXTREMES OF DISCHARGE. Maximum stage recorded during year ending September 30, 1919, 11.1 feet at 10 a. m., May 12 (discharge, 64,700 second-feet); minimum stage recorded 0.63 foot at 11 a. m. October 20 (discharge, 1,080~second-feet). Maximum stage recorded during year ending September 30, 1920, 15.70 feet at 10 a. m. March 6 (discharge, 103,000 second-feet); minimum stage recorded 0.60 foot October 4 and 5 (discharge, 1,010 second-feet). 1895-1920: Maximum stage recorded, 29 feet on March 2, 1902 (discharge, 219,000 second-feet); minimum stage 0.38 foot on September 10, 1914 (discharge, 540 second-feet). The crest of the flood of June 2, 1889, as determined by the U. S. Army En gineers from high-water marks, reached a stage of 40.2 feet (discharge, 325,000 second-feet). POTOMAC EIVEE BASIW. ICE. Stage-discharge relation seldom affected by ice. DIVERSIONS. The Chesapeake & Ohio Canal parallels the P&tomac on the Maryland side. The average discharge of the canal is 75 to 100 second-feet. The discharge is not included in the following tables. REGULATION. Fluctuation at extreme low stages has been noted and is probably caused by the operation of power plants on the upper Potomac and tributaries. ACCURACY. Stage-discharge relation practically permanent; affected by ice Decem ber 17, 1919, to February 22, 1920. Rating curve well defined except at extreme low water. Gage read to hundredth^ once daily, during high water read oftener. Daily discharge ascertained by applying daily gage height to rating table. Records excellent, except those for extreme low stages, which are fair. The following discharge measurement was made by G. C. Stevens: June 30, 1920: Gage height, 1.67 feet; discharge, 3,790 second-feet. Daily discharge, in second-feet, of Potomac River at Point of Rocks, Md., for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1918-19. 1...... S Qifl 2,120 5,700 7,330 7 7W 11,000 12,500 5,380 7,330 5,020 4,170 1,480 2...... 2,520 2,120 4 QQA o -ton 7 7W 11 000 11,500 5,020 Sl fiOA 3 7Af\ 4,010 1 QOA 3...... 2,250 4,500 4,060 34,200 7 7W 12)000 10,500 4,670 6,520 3,390 3,700 1,740 4...... 2,120 5,750 3 240 eft AAA 6,520 13,500 10,500 5,020 5,380 3,090 3,390 1,990 5...... 1,890 6,520 3^090 32,100 6,520 13,500 8,180 5,380 6,130 3,090 3,090 1,990 6...... 1,660 6,520 2,520 28,100 6,130 12,000 7 7W 7 7Crt 5 OCA 2,800 2,520 1,740 7...... 1,510 5,750 S ftftA 15,700 10,000 7,330 7,330 5,020 2,520 3 ion 1 QOft 8...... 1,290 4 QAn 2,730 15,200 5,750 10,000 6,920 6,920 5,380 I oon 4,010 1 ASM 9...... 1,260 S oon 2 Q/\f\ 14,100 5 00/1 12,500 6,520 6 {\nt\ 6,920 3 7AA 4,330 1 740 10...... 1,460 5,560 S ITAA 11,500 5,020 18,000 5,750 o ofu\ 11,500 3 QQA 4,010 1*240 11...... 1,540 5,750 4,010 10,500 4,330 26,800 5,380 52,400 8,620 3,700 3,700 1,480 12...... 1 K4A 5,020 6,920 in ft|Y> 23,600 8,620 64 700 81 fin 4,010 3,390 1 ASf\ 13...... 1,760 5,020 27,500 8,180 4,170 18,600 9,070 34,' 200 7,750 3,700 3,090 1,480 14...... 1 940 5,380 10 ftf\f\ 9,070 4 840 15,200 14,100 OO QftA 7 qqn 3 7AA 2,520 1,990 15...... 1,J 660 5,380 1ft OAA 7,750 5)020 19 **AA 1<> AAA 17 400 8 1 cn 5,020 2,250 , 2,250 16...... 1 540 5,750 18,000 7,330 6 isn U CAA U ftflft 15,700 10,500 11,000 2,250 2,250 17...... '1)390 6,130 |Q OAA 7,750 6,130 11,000 10,000 10 AAA 14,100 5,020 2,520 1,740 18...... 1,560 6,520 15,700 7 7W» 5,750 11,500 9 EOA 12,500 9,070 9,070 4,670 1,480 19...... 1,460 7,750 12 000 8,180 5,380 12,000 12,000 11,000 7,330 9,070 5,020 1,480 20...... 1,080 6,130 9,070 10,000 5,380 11,500 10,500 9 con 7,330 9 070 5,380 1 240 21...... 1,290 6.520 7 7Crt 9,530 5,380 12,000 10,000 23,600 7 7CA 14,100 3,700 1 4fift 22...... 1,510 6,920 9 CQA 11 000 5,020 11,500 9,530 44,600 7 39.O. 21,700 3,390 1 240 23...... 1,890 7,330 14,100 ll| 500 5,020 9,070 8,180 AA Wl 6,520 19,800 3,090 1,990 24...... 1,240 6,180 43 000 11 000 e oOfi a isn 7 7W1 OO KAA 5,380 18,600 2,250 2,250 25...... 1,150 5,020 35' 600 21)100 6,130 7 7V» 7,330 26,100 4,330 14,100 1,740 26...... 1,760 4,670 33,500 24,200 6,520 6,920 6,920 20 400 4,330 W AAA i 74rt 1 990 27...... 1,710 5,380 26,100 18,600 6,920 7,330 6,920 ie)80o 4,010 7,330 1,480 1,740 28...... 1,990 24 800 15,200 11,000 7 7KA 6,520 19 VIA- 6,520 6,920 1 74ft 1 74fl 29...... 1,940 6,130 8,620 12,500 10,500 6,130 11,000 7,750 6,130 1,990 1,740 in 1,990 6,520 Q ion 10,500 1Q QAA 5,750 9 CQA 5,020 4,670 1 QQfl i 4sn 31...... 2,250 7,750 9,530 ...... 15,700 8,620 4,330 1,740 320 SURFACE WATER SUPPLY, 191&-1920, PART I. Daily discharge, in second-feet, of Potomac River at Point of Rocks, Md., for the years ending Sept. SO, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1919-20. 1...... 1,480 4,010 6,130 9,530 9,530 12,500 4,670 3,390 3,090 9,530 2...... 1,240 4,500 5,020 9,070 9,070 12,000 4,330 o. ton 2,520 9,070 3...... 1,240 8,180 4,670 14,100 8,620 11,500 4,010 3,700 2,660 6,930 4 1,010 14,100 4,170 16,800 |O CAA 11,000 4,170 1 onfl 2,520 <; 7*m 6...... "! 1,010 IQ Knn 4,010 28,100 14,100 10,500 4,330 3,390 1,990 5,020 6...... 1 9/1(1 9,070 3 7ftrt W OAft 14,600 10,000 4,670 4,010 2,250 A. tan 7...... 1,480 5,750 9. *7ftft 55,600 19 800 9 KQA 18,600 4,170 2,250 5,750 8...... i tun 4,670 3 oar\ OK an/\ 1ft SftA 9,070 16,800 3 O ROTER NEAR FREDERICK, MD. LOCATION. At Ceresville bridge, on toll road leading from Frederick, Frederick County, to Mount Pleasant, 3,000 feet below Tuscarora Creek (entering from right), 2,000 feet above Israel Creek (entering from left), and 3 miles northeast of Frederick. DRAINAGE AREA. 660 square miles. RECORDS AVAILABLE. August 4, 1896, to September SO, 1920. GAGE. Chain attached to downstream side of right span of bridge; rfead by Eugene L. Derr to December 3, 1919, and after that date by Edward D. Shriner, jr. DISCHARGE MEASUREMENTS. Made from bridge or by wading. CHANNEL AND.CONTROL. Bed composed of gravel and boulders; shifting during very high floods. Control not well defined. Banks lined with trees and brush; subject -. ' to overflow at high stages. , EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Septem ber 30,1919, 17.15 feet at 10.20 a. m., December 23 (discharge, 9,750 second-feet); minimum stage recorded, 3.95 feet, October 1, 2,14-19, 22-24, November 15, 16, and December 7 (discharge, 72 second-feet). Maximum stage recorded during year ending September 30, 1920, 19.80 feet at 7.30 a, m. March 13 (discharge, 12,200 second-feet); minimum stage recorded, 4.10 feet July 30, 31, and August 5-10 (discharge, 88 second-feet). 1896-1920: Maximum stage recorded, 27.2 feet at 11 a. m. January 13, 1915 (discharge, determined from rating curve used for 1916,19,000 second-feet); mini mum stage, 3.54 feet several days in October, 1910 (discharge, 15 second-feet). ICE. Stage-discharge relation affected by ice during severe winters only. ACCURACY. Stage-discharge relation changed during high water of March, 1920; affected by ice December 17-30, 1919, January 5-7, and January 14 to February 17, 1920; discharge estimated from comparison with Potomac River, observer's notes, and weather records. Rating curves well defined between 200 and 15,000 second-feet used before and after March 13,1920. Discharge measurements made during high water of March, 1917, indicate that rating curves used prior to 1916 gave results about 20 per cent too large at high stages. Gage read to half-tenths once daily; oftener during high water. Daily discharge ascertained by applying gage height to rating table. Records good. The following discharge measurement was made by G. C. Stevens: June 29, 1920: Gage height 4.48; discharge, 177 second-feet. 102721 23 WSP 501 21 322 SURFACE WATER SUPPLY, 191^-1920, PART I. Daily discharge, in second-feet, of Monocacy River near Frederick, Md.,for the years ending Sept. SO, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. Jane. July. Aug. Sept. 1918-19. 1...... 72 218 116 1,090 494 1,450 578 415 514 218 326 152 2...... 72 152 104 6,650 454 1,320 622 982 474 218 326 152 3...... 93 128 93 3,440 415 882 667 622 434 178 294 140 4...... 93 116 93 2,270 494 784 622 494 396 178 262 140 5...... 93 93 93 1,570 454 713 622 434 360 204 262 128 6...... 93 93 93 1,450 454 622 600 415 1,030 178 294 1*3ft 7...... 93 93 72 982 434 882 578 396 1,140 204 326 128 Q 93 93 93 982 415 2,840 535 578 622 294 326 116 §:::::::::::::: 93 93 104 882 343 7,550 434 556 1,090 204 262 116 10...... 104 82 116 784 310 5,930 415 3,590 600 178 232 116 11...... 93 93 sia 713 247 2,990 415 3,290 614 232 204 204 12...... 93 93 1,770 535 91 a 1,450 3,440 1,710 690 247 191 932 13...... 93 93 622 494 191 1,200 1,090 1,200 396 218 101 218 14...... 72 93 667 494 784 1,090 760 932 378 204 ITS 178 15...... 72 72 2,270 535 3,750 982 415 882 360 932 204 178 16...... 72 72 1,200 494 2,270 1,200 882 832 1,910 1,710 191 152 17...... 72 378 644 494 1,840 1,450 3,590 736 600 1,200 191 128 18...... 72 2,410 494 713 784. 1,840 1,450 736 396 644 1,200 128 19...... 72 760 415 1,570 622 1,570 1,090 600 326 736 667 128 20...... oa 622 378 1,200 415 882 882 535 294 5,410 690 116 21...... 93 310 310 982 4JU 784 784 3,290 1,770 5,320 360 116 22...... 72 191 2,270 667 474 713 713 5,320 556 1,840 262 116 23...... 72 140 9,750 667 1,710 667 622 2,920 326 4,560 204 1,260 24...... 72 116 3,590 7,190 l'450 600 690 1,640 294 1,450 191 832 25...... 104 104 2,270 1,570 1,200 535 690 1,320 278 932 178 278 26...... 104 93 1,570 1,570 982 494 578 1,090 310 644 204 204 27...... 104 93 1,090 1,320 882 622 514 932 343 556 204 152 28...... 104 93 982 882 784 1,570 454 736 736 474 152 140 29...... 104 191 667 760 1,840 434 690 310 454 152 140 30...... 104 140 454 622 1,090 415 600 232 360 152 140 31...... 104 415 578 882 556 326 152 1919-20. 1...... 128 204 832 434 434 525 592 255 158 110 270 2...... 178 3,750 600 396 832 950 682 226 158 158 240 3...... 152 1,140 514 396 1,320 1,480 505 226 255 122 184 4...... 140 1,090 415 326 4,730 1,290 465 226 226 99 158 6...... 128 982 396 294 8,010 4,560 465 255 198 88 M6 6...... 128 784 396 294 8,560 1,350 388 465 158 88 1% 7...... 128 600 454 294 1,640 1,350 605 318 158 88 525 8...... 128 434 882 326 1,380 1,290 465 255 335 88 485 9...... 128 378 882 2,920 7,640 1,050 425 198 240 88 270 10...... 116 326 2,920 1,840 1,900 9,940 900 425 198 212 88 212 11...... 116 396 1,640 514 9,660 750 388 198 158 370 240 12...... 128 1,380 882 434 9,390 750 335 198 302 158 184 13...... 360 2,840 982 343 10,600 1,170 728 198 615 2,240 158 14...... 326 2,270 2,700 2,690 850 1,420 198 950 302 158 15...... 278 882 1,710 2,320 615 750 255 950 240 134 16...... 278 690 644 2,920 660 548 286 370 134 134 17...... 278 622 4,070 950 505 425 302 171 134 18...... 622 . 556 982 2,170 1,540 465 728 198 1,110 134 19...... 294 514 932 1,960 950 425 425 171 5,160 110 20...... 262 434 1,910 2,840 850 388 226 158 1,420 110 21...... 204 378 1,320 2,320 2,690 388 255 158 4,560 99 22...... 178 360 650 736 1,540 2,100 388 318 134 2,540 99 23...... 178 326 832 1,350 950 425 286 134 900 99 24...... 514 326 f 520 326 1,170 850 850 226 122 525 99 25...... 600 326 932 1,050 728 352 592 110 485 99 26...... 4. NOTE. Discharge, Oct. 16, interpolated; Dec. 17-30,1919, Jan. 5-7, and Jan. 14 to Feb. 17,1920, estimated because of ice by comparison with records of flow of Potomac River, and study of observer's notes, and weather records. Braced figures show mean discharge for figures included. EAPPAHAFFOOK BIVEB BASIN. Monthly discharge of Morfocacy River near Frederick, Md.,for the years ending Sept. SO, 1919 and 19W. [Drainage area, 660 square miles.] Discharge in second-feet. I Bun-fit in Month. Per inches. Maximum. Minimum. Mean. square mile. 1918-19. October ...... 104 72 88.4 0.134 0.16 N ovember...... 2,410 72 244 .370 .41 December...... 9,760 72 1,070 1.62 1.87 January . . . 6,660 494 1,420 2.15 2.48 February...... 3,760 191 832 1.26 1.31 March...... 7,550 494 1,530 2.32 2.68 April...... 3,590 415 853 1.29 1.44 Ifiy.*.-...... 5,320 396 1,260 1.91 2.20 1,910 232 689 .892 1.00 July...... 5,410 178 984 1.49 1.72 August...... 1,200 152 291 .441 .61 September...... 1,260 116 235 .356 .40 9,760 72 786 1.19 16.17 1919-20. October...... 623 116 249 .377 .43 November ...... 3,750 204 894 1.35 1.51 2,920 791 1.20 1.38 2,920 662 1.00 1.15 February ...... 1,500 2.27 2.45 10,600 434 3,400 5.15 5.94 April...... 4560 525 1,160 1.76 1.96 May...... 1,420 255 490 .742 .86 728 158 282 .427 .48 July...... 950 88 243 .368 .42 5,160 88 751 1.14 1.31 615 99 217 .329 .37 10,600 88 885 1.34 18.26 RAPPAHANNOCK RIVER BASIN. RAPPAHANNOCK RIVER NEAR FREDERICKSBTJRG, VA. LOCATION. At rear of McWhirt farm, 1J miles above dam of Spottsylvania Power Co. and 3J miles above Fredericksburg, SpottsyVvania County. DRAINAGE AREA. 1,590 square miles. RECORDS AVAILABLE. September 19,1907, to September 30,1920. GAGE. Vertical staff on right bank; installed November 4, 1913, to replace chain gage destroyed October 31, 1913. Original gage wag a vertical staff which was destroyed February 14, 1908, and replaced February 20,1908, by a chain gage under the cable. All three gages at practically the same location and referred to same datum. Gage read by Charles Perry. DISCHARGE MEASUREMENTS. Made from cable at gage. At extremely low water measurements can be made by wading or from a bridge over the power canal below the dam. CHANNEL AND CONTROL. Bed composed of boulders; somewhat rough. One chan nel. Banks wooded; water overflows right bank at stage about 15 feet and left bank at about 12 feet. Current sluggish at extremely low water. Control is a rocky section a few hundred feet below the gage; practically permanent. 32* SURFACE WATER SUPPLY, 19J9-1920, PART I. EXTREMES OF DISCHARGE. Maximum stage recorded during the year ending Sep tember 30, 1919, 7.49 feet at 1 p. m., January 3 (discharge, 18,200 second-feet); minimum stage, 0.54 foot, September 20 (discharge, 123 second-feet). ; Maximum stage recorded during the year ending September 30, 1920, 4,54 feet at 9 a. m., August 29 (discharge, 6,480 second-feet); minimum stage, 0.56 foot October 1 (discharge, 129 second-feet). 1907-1920: Maximum stage recorded, 11.45 feet at noon April 11, 1918 (dis charge, 38,500 second-feet); minimum stage recorded, 0.30 foot at 3 p. m. August 21. 1914 (discharge, 72 second-feet). ICE. Ice forms near gage but seldom in sufficient quantity at control to effect stage-, discharge relation. ACCURACY. Stage-discharge relation practically permanent; affected by ice Decem* ber 19, 1919, to February 5, 1920. Rating curve well defined except at extreme high and low stages. Gage read to hundredths twice daily. Daily discharge ascertained by applying mean daily gage height to rating table. Gage readings doubtful. Records fair. The following discharge measurement made by B, J. Peterson and Kendall Hoyt: , June 26, 1920: Gage height, 2.01 feet; discharge, 1,350 second-feet. Daily 'discharge, in second-feet, of Rappahannock River near Fredericksburg, Va., for the years ending Sept. 30, 1919 and 1920. Day. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. June. July. Aug. -Sept. 1918-19. 1...... 353 398 750 ' 1,840 1,350 4,920 1,920 1,420 1,420 1,220 805 347 2...... 347 569 607 4,850 1,200 3,600 1,770 1,480 1,350 1,100 750 347 3...... 328 588 518 18,200 1,040 3,130 1,560 1,620 1,280 1,040 805 347 4...... 310 441 486 10,500 1,100 3,560 1,420 1,220 1,040 854 645 385 &...... 299 398 470 5,910 1,280 2,360 1,620 1,220 1,040 708 666 334 6...... 322 360 427 3,490 1,040 2,140 1,480 1,220 1,160 645 750 322 7...... 322 S47 398 3,100 OKI 1,970 1,350 1,220 3,700 607 2,240 328 8...... 316 322 427 2,400 984 4,700 1,350 1,790 2,740 588 1,620 299 9...... 299 347 385 2,080 1,020 6,200 1,280 2,260 2,400 687 1,350 287 10...... 299 347 502 2,000 984 4,280 1,280 8,680 2,080 550 1,280 287 11...... 293 334 687 1,700 940 3,720 1,280 7,070 2,920 607 1,229 299 12...... 299 328 1,160 1,560 940 3,420 5,360 5,360 2,920 560 1,100 412 13...... 310 322 1,560 1,420 2,140 3,120 3,290 3,490 2,080 550 1,040 379 14...... 322 287 1,280 1,350 2,990 2,780 2,920 3,290 1,840 502 750 347 15...... 299 265 4,850 1,420 3,630 2,440 2,240 2,920 1,«20 470 569 265 16...... 299 250 4,140 1,420 2,560 2,220 2,400 2,570 1,620 518 494 174 17...... 293 322 2,400 1,420 2.-140 2,080 3,920 3,700 2,400 645 502 162 18...... 28? 441 2,000 1,480 1,790 2,080 2,920 3,100 1,920 1,560 427 159 19...... 244 3,290 1,420 1,480 1,540 1,920 2,080 2,920 1,700 3,920 405 140 20...... 270 1,770 1,160 1,480 1,370 1,840 2,000 2,740 1,480 6,190 398 123 21...... :..... 287 1,220 1,100 1,480 1,490 2,000 1,62) 6,409 1,420 6,480 ono 136 22...... 299 918 1,480 1,560 1,880 1,840 1,480 4,610 1,770 3,330 398 129 23...... 299 750 12,400 1,620 2,530 1,620 1,480 4,180 1,350 6,190 398 178 24...... 287 79Q 4,850 3,290 2,140 1,480 1,480 3,290 1,160 5,630 392 472 25...... 299 569 4,610 2,570 2,260 1,420 1,420 3,490 1,100 3,700 334 392 26...... 299 559 3,290 2,920 2,390 1,350 1,350 2,920 1,220 3,290 322 372 27...... 322 486 2,570 2.570 2,480 1,480 1,350 2,400 1,560 2,570 310 353 28...... 334 569 2,240 1,700 2,560 5,910 1,350 1,920 1,700 1,920 304 347 29,,...... 334 687 2,080 1,560 3,290 1,350 1,770 1,480 1,480 299 347 36...... 347 860 1,700 1,480 3,100 1,350 1,620 1,350 1:280 3% 224 31...... 353 1,480 1,420 2,240 1,480 1,220 328 Daily discharge,,in secontL-feet, of Rappohemnqej^Jgizier near Mr#jefi$ksburg, Va., for the years ending Sept. 30, 1919 and 1920 Continued. Day. Oct. Nov. Dec. Jan. ,;F,eb. Mar. Apr. May. June. July, Aug. Sept. 1919-20. yui 1...... 136 K1Q 1 '975040 1 MISCELLANEOUS MEASUREMENTS. Miscellaneous measurements in north Atlantic slope basins during the years ending Sept. 30, 1919 and 1920. Gage Dis Date. Stream. Tributary to . Locality. height. charge. 1920. Feet. See.-ft. 5.81 704 July 22 .....do...... 5.49 421 Sept. IS .....do...... do...... do...... v... 6.06 654 1918. Oct. 27 Pittsfleld, Maine...... 3.86 644 28 .....do...... do...... do...... 4.02 781 1919. Sept. 6 .....do...... 172 stream. 16 .....do...... do...... 212 1920. July 10 1,150 1919. July 30 .....do...... 4 08 1,520 1920. Sept. 15 .....do...... do...... do...... 7.75 7,780. 1919. July 9 1.62 49.9 Apr. 30 16.6 June 19 Harris Lake, Newcomb, N.Y. 306 May 7 <>3.64 130 Aug. 21 .....do...... Gage No. 2, Glens Falls, N. Y. 150 Sept. 3 .....do...... do...... 148 .....do...... do...... do...... 150 27 .....do...... do...... 210 May 23 .....do...... do...... 82 23 .....do...... '..do...... 63 23 .....do...... do...... 45.6 23 .....do...... do...... do...... 24..S 22 .....do...... Above gage No. 2. feeder 5.6 canal, Glens Falls, N.Y. 23 .....do...... 57 23 .....do...... do...... do.'...... 57 1920. Mar. 29 Mohawk River ...... do...... Freemans Bridge. Schenee- 6216.6 35,000 tady, N. Y. 31 .....do...... do...... 6215.56 30,000 Apr. 15 .....do...... do...... do...... 6212.74 13,100 1919. July 19 Trenton Falls, N.Y...... 91 20 .....do...... do...... do...... 126 20 .....do...... Stittvffle,N.Y...... 122 Oct. 28 .....do...... Cohoes,N.Y...... 2,830 Corporation's power canal. 1920. Apr. 23 "WaUMll River Florida, N.Y...... 34.1 May 28 T^ift'Tp T*a«Qnjyo f~*r<»ft1r .6 and old cabin in Little Fort Valley, near Stras- burg. Va. 28 .....do...... *.... do...... 1.9 "Mud Hole" in Mud Hole Gap, near Strasburg, Va. Old U. S. Geol. Survey gage. i Barge Canal datum. INDEX. A. Page. Page. Cobbosseecontee Stream at Gardiner, Maine. 326 Accuracy of data and results, degrees of.... 10-11 Cochituate, Mass., Lake C-ochituatebaaln near. 94-96 Acre-foot, definition of...... 8 Cohocton River near Campbell, N. Y...... 265-268 Adirondack Electric Power Corporation, near Savona,N. Y...... 264-265 cooperation by...... 12 Cohoes, N. Y., Cohoes Power & Light Cor Amherst, Maine, West Branch of Union poration's power canal at...... 326 River at...... 19-20 Computations, results of, accuracy of...... 10-11 Androseoggin River at Berlin, N. H...... 55-66 Conklin, N. Y., Susquehanna Riverat.... 243-246 atErroldam,N. H...... 53-54 Connecticut, cooperation by...... 11 atRumford,Maine...... 57-58 Connecticut Power Co., cooperation by...... 12 Androseoggin River basin, N. H. and Maine, Connecticut River at First Connecticut Lake, gaging-station records in...... 53-62 near Httsburg, N. H...... 108-110 Appropriations, record of...... 7 atOrford, N. H...... 111-113 Ashuelot River at Hinsdale, N. H...... 123-121 at Sunderland, Mass...... 114-116 Athol, Mass., East Branch of Tully River at White River Junction, Vt...... 326 v near...... 139-141 Connecticut River basin, N. H., Vt., Conn., Aziscohos dam, Maine, Magalloway River at. 59 and Mass., gaging-station records B. in...... 106-169 Baileyville, Maine, St. Croix River near.... 15-16 Connecticut Valley Lumber Co., cooperation Bald Eagle Creek at Beech Creek station, by...... 12 Pa...... 294-296 Contoocook, N. H., Blackwater River near... 86-88 atMilesburg,Pa...... 291-293 Contoocook River near Elmwood, N. H...... 84-86 Bangor, Maine, Kenduskeag Stream near.... 39-41 Control, definition of...... 8 Beaver Kill at Cooks Falls, N. Y...... 225-228 Cooks Falls, N. Y., Beaver Kill at...... 225-228 Beech Creek station, Pa., Bald Eagle Creek Cooperation, record of...... 11-12 at...... 294-29R Cornish, Maine, Ossipee River at...... 69-71 Berlin, N. H;, Androseoggin River at...... 55-56 Saco River at...... 64-67 Bethlehem, Pa., Lehigh River at...... 235-237 Covert, C. C., and assistants, work of...... 12 Bigwood, B. L., work of...... ,...... 12 Crescent dam, N. Y., Mohawk River.at.... 210-212 Blackwater River near Contoocook, N.JH.... 86-88 Cumberland County Power & light Co., co- Bloomsburg, Pa., Fishing Creek at...... 278-279 . -operation by...... 12 Bond Creek at Dunham Basin, N. Y...... 326 Current meters, Price, plate showing...... 8 Bower, Pa., West Branch of Susquehanna D. Riverat...... 280-282 Brandy wine Creek at Chadds Ford, Pa.... 241-243 Danville, Pa., Susquehanna River at...... 251-253 Bridgewater, Mass.j Taunton River near.... 96-97 Data, accuracy of...... ,>; t...... 10-11 Bristol, N. H., Smith River near...... 81-83 explanation of...... 9-10 Burtonsville, Md., Patuxent River near... 316-318 Dead River at The Forks, Maine...... 50-52 Deerfleld River at Charlemont, Mass...... 145-147 C. Definition of terms...... 8 Campbell, N. Y., Cohocton River near..... 265-268 Delaware River at Eort Jervis, N. Y...... 220-222 Cedar River at Indian Lake, N. Y...... 326 at Riegelsvllle, N. J...... ,.,-.,.... 223-225 Cedar Run, Pa., Pine Creek at...... 296-297 East Branch of,at Fish Eddy, N. Y.. 218-220 Central Maine Power Co., cooperation by.... 12 West Branch of, at Hale Eddy, N. Y.. 228-230 Chadds Ford, Pa., Brandywine Creek at.. 241-243 Delaware River basin, N. Y., N. J., and Pa., Charlemont, Mass., Deerfleld River at..... 145-147 gaging-station records in...... 218-243 Chemung River at Chemung, N. Y...... 261-263 Derby, Matne, Piscataquis River at...... «,.. Sf6 Chenango River near Chenango Forks, Dimeling, Pa., Clearfleld Creek at...... 286-288 N. Y...... ^...... 256-258 Diraulaitis, J. J., .workof..,.*..:,,...... 12 Chesham, N. H., Pratt Brook at...... 127-129 Dixon, Pa., TunkhannockCreek.at...... 271-278 ClearfieldCreekatDimeling,Pa...... 286-298 Dunham Basin, N. Y., Bond Creek at...... 326 Clinton, Mass., South Branch of Nashua feeder canal at...... 326 River basin near...... 93-94 Old Champlain canal at..,...... 326 327 328 INDEX. E. Page. Housatonic River at Falls Village, Conn... 172-174 Eagle Bridge, N. Y., Hoosic River near... 205-208 East Hartford, Conn., Hockanum River near Great Barrington, Mass...... 170-172 near...... 168-169 Hudson River at Gooley, near Indian Lake, Eastern Connecticut Power Co., cooperation N.Y...... 176-182 by...... 12 at Mechanicville,N. Y...... 190-192 Elmwood, N. H., Contoocook River near.... 84-86 at Newcomb, N. Y...... 326 Errol dam, N. H., Androscoggin River at.... 53-54 at North Creek, N.Y...... 182-184 Erving, Mass., Millers River at...... 132-134 at Spier FaUs, N.Y...... 188-190 Erwins, N. Y., Tioga'River near...... 259-261 atThurman, N. Y...... 185-187 Hudson River basin, N. Y., gaging-station F. records in...... 179-^218 FaUs Village, Conn., Housatonic River at.. 172-174 I. Farmington River at New Boston, Mass.. 166-168 Feeder canal at Dunham Basin, N. Y...... 326 Indian Lake,N. Y., Cedar Riverat...... 326 at Glens Fafls, N.Y...... 326 Hudson River near. t ...... 179-182 First Connecticut Lake near Pittsburg, Indian River near...... 195-197 N. H.....:...... 106-107 Indian Lake reservoir near Indian Lake, First Connecticut Lake, N. H., Connecticut N.Y...... 192-194 . Riverat...... 108-110 Indian River Co., cooperation by...... 12 Fish Eddy, N. Y., East Branch of Delaware Indian River near Indian Lake, N. Y...... 195-197 Riverat...... 218-220 International Paper Co., cooperation by ..... 12 Fishing Creek at Bloomsburg, Pa...... 278-279 Fiskeville^ R. I., Pawtuxet River at...... 98-101 J. Florida, N. Y., Quaker Creek at...... 326 Jewett City, Conn., Quinnebaug River at.. 102-104 Foxcroft, Maine, Piseataquis River near.... 33-35 J. G. White Engineering Corporation, coop Framingham, Mass., Sudbury River basin eration by ...... 12 near...... 94-96 Juniata River at Newport, Pa...... 302-304 Franklin Junction, N. H., Merrimack River Frankstown Branch of, at WiUiamsburg, at...... 75-77 Pa...... 304-306" Frederick, Md., Monocacy River-near..... 321-323 RaystownBranchof,atSaxton,Pa.... 306-308 Fredericksburg, Va., Rappahannock River near...... 323-325 K. Friez water-stage recorder, plate showing.... 9 Keene G as & Electric Co., cooperation by. ... 12 G. Kenduskeag Stream near Bangor , Maine. .... 39-41 Kennefoec River at Moosehead, Maine ...... 44-45 Gaging station, typical, plate showing...... 8 at The Forks, Maine...... 46-48 Gardmer,Maine,Cobbosseecontee Stream at. 326 at WaterviUe, Maine...... 48-50 Gibbs Crossing, Mass., Ware River at...... 147-149 Kennebec River basin, Maine, gaging-station Glens FaUs, N. Y., feeder canal at ...... 326 records in...... 41-52 Gooley, N. Y., Hudson River at...... 179-182 KnightviUe, Mass., Westfleld River at. .... 155-157 Goss Heights, Mass., Middle Branch of West- field Riverat...... 160-163 Great Barrington, Mass., Housatonic River Lackawanna River at Moosic, Pa...... 273-274 near...... 170-172 Lake Cochituate basin near Cochituate, Grindstone, Maine, East Branch of Penobscot Mass...... 94-96 Riverat...... 28-30 Lawrence, Mass., Merrimack Riverat...... 77-81 Gurley printing water-stage recorder, plate LeMgh River at Bethlehem, Pa ...... 235-237 showing...... 9 at Tannery, Pa...... 1...... 233-234 H. Leighton, M. O., cooperation by...... 12 Little Androseoggin River near South Paris, Hadley, N. Y., Sacandaga River at...... 203-205 Maine...... 60-62 Hale Eddy, N. Y., West Branch of Delaware Little Passage Creek near Strasburg, Va. .... 326 Riverat...... 228-230 Little Schuylkill River at Tamaqua, Pa. . . 237-239 Harpers, Pa., Swatara Creek at...... 312-314 Little Swatara Creek near Pine Grove, Pa.. 314-315 Harrisburg, Pa., Susquehanna River at..... 254-256 Lowell, Maine, Passadumkeag River at...... 37-39 Hartwell, O. W., and assistants, work of..... 12 Lycoming Creek near Trout Run, Pa...... 300-301 HiniMey, N. Y., West Canada Creek at... 212-214 Hlnsdale, N. H., Ashuelot River at.*..u.. 123-125 M. Hockanum River at RockviUe, Conn...... 326 Machias River at Whitneyville, Maine...... 17-19 near East Hartford, Conn...... 168-169 Magalloway River at Aziscohos dam, Maine. 59 Holland Patent, N. Y., Ninemilfr feeder Maine, cooperation -by ...... i . ^ 11 near...... 215-216 Marlboro, N. H., Minnewawa Brook at.. I. '425-127 Holyoke Water Power Co., cooperation by.... 12 Massachusetts, cooperation by...... -..'...». - 11 'Hoosic River near Eagle Bridge, N. Y..... 206-208 Mattawamkeag River at Mattawatakeag, Hope, N. Y., Sacandaga River near...... 201-203 Maine...... 30-32 INTOEX. Page. Mechanicville, N. Y., Hudson Blver at.... 190-192 Penobscot Biver at West Enfidd, Maiae.i.i'!S*-lir, Medway, Maine, West Branch of Penobscot East Branch of, at Orindstooe, Maine... 2»«J Biver near...... 22-24 West Branch of> at Milliao«6^t; Mfttoe... 21 Merrimack, N. H., Souhegan River at ...... 91-93 near Medway, Maine.^..^i.^1.^.^®^ Merrimack Biver at Franklin Junction, N.H. 75-77 Penobscot Biver basin, Maine, gaging-station at Lawrence, Mass...... 77-81 rcixspdsin...... 's.^.i;. 21-41 Merrimaek River basin, N. H. and Mass., Peterson, B. J., work of...... ;...... 'I-.. 12 gaging&tation records in...... 72-96 Pleasant Elver at Milo, Maine...... ^,.. '8S-36 Mianus River at North Mianus, Conn. .... 177-179 Plymouth, iN. H., Pemigewasset River at. V. 72-74 Milesburg, Pa., Bald Eagle Creek at ...... 291-293 Pierce, C. H., and assistants, work of.....;.%' 12 MUlfirsj'Biver at,j$rying, Mass...... 132-134 Pine Creek at Cedar- Bun, Pa.. near Wlnchendon, Mass. _ ...... 129-131 near Waterrille, Pa...... Miliinocket, Maine, West Branch of Penob Pfae Grove, Pa., scot Biverat...... 21 Plscataquis Biver at Derby, Maine...... i %%& Milo, Maine, Pieasant'Biver at ...... 35-36 near Foxcroft, Maine.i.....:...... ^:.;. 33-35 Minnewawa Brook at Marlfcoro, N.H..... 125-127 Mttsburg, N. H., Connecticut Blver near.. 10(3-110 Mohawk Rivet at Crescent dam, N. Y.. ... 210-212 First Connectfcuti&ake near. 1... .iv; . ^ifepr at Schea0etady,N. Y...... 326 Pittsfleld, Maine, Sebasticook Biver at. £*&:> ^W at Vischer Ferry dam, N.Y...... 208-210 Point of Bocks, M*., JPotbmac Rivet'at..;. 31&-820 Monocaey Biver. near Frederic*, Md. . . . ,» . 321-523 Port Jervis, N. Y., Delaware RiTCT at..... 220-222 Moosehead Lake at east outlet, Maine...... 43-44 Port Royal, Pa.^Tuscarora Greek near,... 308-310 Moosehead, Maine, Kennebec Biver at...... 44-45 Potomac Biver at Point of Bocks, Md..... 318-320 Moose River near Rockwood, Maine...... 41-42 Potomac Biver basin, Md., ga^tog^itatioBt * ; Moosic, Pa., Lacka wanna Biver at...... 273-274 records in.. I;..'.....>.;;v..... 316-323 Moss Brook .at Wendell Depot, Mass...... 142-144 Pratt Brook at Chesham, N. H...... 12T-I2J Mad Creek at Savona, N.Y...... 268-270 Presumpscot Biver at Sebago Lake outlet, Maine.;...... -.^...... ^62-84 Price current meters, plate showing^..,..i.,,1- « Nashua River basin, South Branch of, near Priest Brook near WinchendoQj Mass...... 137-139f ;: Clinton, Mass...... 93-94 Profile Falls Power Co., cooperation by...... 12 Naugatuck Biver near Naugatuck, Conn. . 175-177 .'" ". Q.. '" ;... ,;, .;'= Nescopeck Creek near St. Johns, Pa ...... 276-278 New Boston, Mass., Farmington River at.. 166-168, Quaboag Biver at West Brimfleld, Mass... 153-155 . Newcomb, N. Y., Hudson Biver at...... 326 Quaker Creek at Florida, N. Y...... v. 32ft New England Power Co., cooperation by .... 12 Quinnebaug Biver at Jewett City, Conn... 102-104 Newfane, Vt., West Elver »t>,...... 121-122 New Hampshire, cooperation by...... 11 B. ' V- . Newport, Pa., Juniata BiVer at...... 302-304 Rappahannock Biver near Frede^icfcsburgi New York, cooperation by...... 11 Va..;...... :J...... :. 323-325 New York, New Haven & Hartford Bailroad, Beading, Pa., Schuylkm Biver at...... 239-240 cooperation by...... 12 Benovo, Pa., West Branch of Susquehaana NJnemUe Creek at Stitfefille, N. Y...... 326 Biver at...... 282-28* Ninemile,feedec;8it Trenton Falls, N.; Y. ....;. 326 Blegelsville, N. J., Delaware Biver at..... 223-225 near Holland Patent, N.'Y. .;..,.. .. 215-216 Blverbank, N. Y., Schroon Biver at..«... 198-200 North Chichester, N. H., Suncook Riverat... 89-91 Bockville, Conn*, Hockanum Eiver at...... 32ft North Creek, N.Y., Hudson Biver at. ... .182-1849 Bockwood, Mame, Moose Biver near,...... * 41-42? North Mianus, {/ram., Mianus Biver at 1 ... 177-176 Bumford, Maine, Androscoggin Biver at..,. 57-$S Run-off in inches, definition of...., .>...... 8 Old Champlaln canal at] Dunham Basin, N.Y. 326 Olmsted's MtfV Pa., Yellaw Breeches Creek Sacandaga Biver at Hadtey, N.Y...... 203-205 at...... 311-312 near Hope, N.Y...... m<-m Orfbrdj N. H., Connecticut IBiver at ...... 111-113 Saco Biyra at Cornish, Maine,..... £ . ;,...... 64-67 Ossipee Biver at Cornish, Maine...... 69-71 at West Barton, Maine...... N>:...... 67-69,326 Saeo Biver basin, Maine, gaging-statiou r P. records in..,...-.,...... Passadumkeag Blver at Lowell, Maine ...... 37-39 St. Craix Pulp & Paper Co., cooperation by.. Passumpsic EAver at Pierce's mills, near St. St. Croix Biwr near Baileyville, Mame,.,,.. , . ' JonniSibury, yt..!...... 116-118 St. John Eiver at Yan Bur«n, Maine.....,...>, 13-15, Patuxent Elver near BurtonsvUle, Md. . . . . 318-318 St. Johrabury,Vt,, Paasunjjteie Bivar neat.; Jld-tlt Pawtuxet Biver at Fiskevffie, B.I...... 98-101 St. Johns, Pa., Neseopeck Creek near...... 276-278 Pellets Island Mountain, N. Y., WalUdll Savona,N.'.Y.»Cohoctoa Eiver rmr...... mjffi , Biverat...... 216-218 MudCreefcat...... 268-270 Pemigewasset Biver at Plymouth, N. H..... 72-74 Saxton, Pa., Baystown Branch of Juniata Pennsylvania, cooperation by ...... 11 Biver at...... 306-308 102721 23 WSP 501 22 INDEX. gehsnectady, N. Y., Mohawk River at...... 326 Turners Falls Power & Electric Co., coopera- gsbjroon River at Riverbaak, N. Y...... 198-200 ScJaiylkiU Rii^er afrBeading, Pa...... 239-240 Toaoarora Creek near Port Royal, P^ty.... 308-31* Sebago Lake outlet, Maine, Presumpscot - It. ' ' ^ '-;/ ; : Riverat...... 62-64 Sebastieook River at Pittsfield, Maine...... 326 Union River basin, Maine, gaging-station , Second-feet, definition of...... 8 Second-feet per square mile, definition of.... 8 Union River, West Brandy of , ,&$ Amherst, ShetuekettRiver at South Windham, Conn - 104-108 Maine...... ^...,...... ,!.. i Sinnemaboning Greek, Driftwood Branch of, ,-. .. *.; at Sterling Run, Pa.'-...... 289-291 Van Buren, Maine, St. SUp-Pond Brook near Winchendon, Mass... 134-136 Vermont, cooperation by ...... ^...... 11 §jBith River n«ar,Bristol, N.H...... 81-83 Viseher Ferry dam, N. Y., Mohawk River Souhegan River at Merrimack, N. H...... 91-93 at...... V...... 208-210; South Paris, Maine, Little Androscoggin .,,' i Rivernear...... 60-62 SeiithWindham, Conn., Shetwsket River at. 104-106 Wallenpaupack Creek at Wflsoaville, Pa, . . 231-23& Sgfer Falls, N. Y., Hudson River at...... j, 188-190 Wallkill River at PeUets Island Motiirtaia, Sppttsylvania Power Co., cooperation by..... 12 N. Y...... ?,.,...... ^. 216-218 Stage-discharge relation, definition of...... 8 Walters, M. I., werk-of..'...... 12 Sterling Run, Pa., Driftwood Branch of Wapwallopen Creek near Wapwallopen, Sinnemahoning Creek at...... 28&-291 Stevens continuous water-stage recorder, Ware River a# Gibbs Cfossmg; Mass...... 147-1^ r v . plate showing..'...... 9 Water-stage recorders, plate showing. . . . . £ k , & Stevens, G. C., and assistants, work of...... 12- Waterville, Maine, Kennebec River at...... 48-50 Strasburg, Va., Little Passage Creek near..... 326 WaterrtUe, Pa., Pine Creek near...... 29&360* Stitfrrille, N. Y., Ninemile Creek at...... 326 Wendell Depot, Mass., Moss Brook at..... 142-144 Sudbury River basin near Framingham,Mass. 94-46 West Brimfield, Mass., Quaboag River at.. 153-155^ Suncook River at North Chichester, N.M... 89-91 West Buxtoa, Matee, Sac o Elver at.. ... 87-6%326v Sunderland, Mass., Connecticut River at... 114-116 West Canada Creek at Hinekley, N. Y.... . 212-214 Susquehanna River at Conklin, N. Y...... 243-246 West Enfleld, Maine, Penobscot River at. . 24-27- at Danville, Pa...... 251-263 Westfield Little River near Westfteld, Mas^. 1^^165- at Harrisburg, Pa...... 254-256 Westfield River at KJrightsvilte, MasS.-.-.J 166-157' atTowanda,Pa...... 246-248 Middle Branch of, at Goss Heights, I at Wilk'es-Barre, Pa...... 249-251 West Branch of, at Bower, Pa...... 280-282 near Westfleld,Mas^...... 158-1W-. West Branch of/at Renovo, Pa...... 282-284 West Hartford, Vt., White River at...... 118-120- West Branch of, at Williamsport, Pa... 284-286 West River at Newfane, Vt...... 1121-122 Susquehanna River basin, N. Y. and Pa., West Ware, Mass., Swift River at ...... 150-152 " . gaging-station records in...... 243-315 White River at West Hartford, Vt ...... 11S-12Q; Swatara Creek at Harpers, Pa...... 312-314 White River. Junction, Vt.> Connecticut Swift River at West Ware, Mass...... 150-152 River at....j.j.4i...... i.,vJ ; 3S& W. H. McElwaisf Co., cooperation, .by...;.... 13 T. WbltneyvUle, Maine, Machlas Rive* at .....17-19. Tamaqua, Pa., Little Schuylkffl River at.. 237-239 Wilkes-Barre, Pa., Susquehanna River at. 249-251 Tannery, Pa., Lehigh River at...... 233-234 WilUamsburg, Pa., Frankstown Branch of Taunton River at Titicut, near Bridgewater, Juniata River at. ... .s...... i /304-305. Mass...... 96-97 WiUiamsport, Pa., West Branch of Susque T erms, definition of...... 8 hanna River at...... 284-286, Thames River basin, Conn., gaging-station Wilsonvflle, Pa., WaUenfaapadk Creek at. 231-233 records to...... ;...... 102-106 Winchendon, Mass., MiHeis River nete.;.: a29-asi Tfte Porks, Maine, Dead River at...... 50-52 Priest Brook near...... 137-139 KennebecRiYerat...... ^, 46j48 Sip Pond Brook near:,...... v...... 13*rJ38, Thurman, N. Y., Hudson River at...... 185-187 Work, authorization ofv. ..'iiiii-...*....^..;* 7 Tioga River nieat Erwins, N. Y.»...... 259-261 division of...... 12 Tlticut, Mass., Taunton River at...... 96-97 scope of...... 7-8> Towandai Pa.-, Susquehanna River at...... 246-248 ' "''"'' .Y.', .', . '"'' Trenton Falls, N. Y., Ninemile feeder at..... 326 YeUow Breeches Creek ' a? Olmste&s , Mui, Tfdut Run, Pa., Lycoming Creek near.... 300-301 Tally, River, Bast Branch of, near Athol, pa.. ...;...... ,...'; ..;,' Mass.-,. L.;...... 139-141- '" ' Z. -.-. -:^:;- Timkhannock Creek at Dixon, Pa i...... 271-273 O