Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut Through 2005

Home , Aspetuck River, Bigelow Brook, Blackberry River, Blackledge River, Carr River, Coginchaug River

Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

By Elizabeth A. Ahearn

Prepared in cooperation with the Connecticut Department of Environmental Protection and New England Water Pollution Control Commission

Scientific Investigations Report 2007–5270

U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior DIRK KEMPTHORNE, Secretary U.S. Geological Survey Mark D. Myers, Director

U.S. Geological Survey, Reston, Virginia: 2008

For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report.

Suggested citation: Ahearn, E.A., 2008, Flow durations, low-flow frequencies, and monthly median flows for selected streams in Connecticut through 2005: U.S. Geological Survey Scientific Investigations Report 2007–5270, 33 p. ONLINE ONLY iii

Contents

Abstract...... 1 Introduction...... 1 Streamflow Statistics at Stations with Continuous Record of 10 Years or More ...... 2 Flow Durations...... 2 Low-Flow Frequencies...... 4 Monthly Median Streamflows...... 4 Estimation of Low-Flow Statistics at Short-Term Stations and Partial-Record Sites...... 5 Summary...... 8 Acknowledgments...... 8 Selected References...... 8

Figures

1–2. Maps showing— 1. Locations of all streamgaging stations and partial-record sites used to estimate flow durations, low-flow frequencies, and monthly median flows for selected streams in Connecticut through 2005...... 3 2. Locations of index stations, short-term stations, and partial-record sites used for correlation of base flows...... 6 3. Graph showing an example of the MOVE.3 relation between a partial-record station, Haleys Brook (0118750), and an index station, Pendleton Brook (01118300)...... 7

Tables

1. Descriptions of streamgaging stations with 10 or more years of continuous record in Connecticut used to compute flow durations, low-flow frequencies, and monthly median flow statistics...... 12 2. Flow-duration statistics for 91 streamgaging stations with 10 or more years of continuous record in Connecticut...... 15 3. Low-flow frequency statistics for 91 streamgaging stations with 10 or more years of record in Connecticut...... 18 4. Monthly median streamflows for 91 stations with 10 or more years of record in Connecticut...... 21 5. Descriptions of short-term stations in Connecticut used in correlation of daily mean base flows to estimate low-flow statistics...... 24 6. Descriptions of partial-record sites in Connecticut used in correlation of daily mean base flows to estimate flow duration, low-flow frequency, and August median statistics...... 25 7. Basin characteristics for the index stations, short-term stations, and partial- record sites...... 26 8. Summary of low-flow correlation coefficients at short-term stations and partial- record sites in Connecticut...... 29 9. Low-flow statistics derived using the MOVE.3 method for short-term streamgaging stations and partial-record sites in Connecticut...... 32 iv

Conversion Factors and Datum

[Inch/Pound to SI]

Multiply By To obtain Length foot (ft) 0.3048 meter (m) Area square mile (mi2) 2.590 square kilometer (km2) Flow rate cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s) cubic foot per second per square mile 0.01093 cubic meter per second per square [(ft3/s)/mi2] kilometer [(m3/s)/km2]

Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD 27). Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

By Elizabeth A. Ahearn

Abstract life. As water withdrawals increase, more rivers have become environmentally stressed. Over recent years, the state govern- Flow durations, low-flow frequencies, and monthly ment of Connecticut has worked towards integrating water median streamflows were computed for 91 continuous-record, allocation and uses with protecting the ecological integrity streamflow-gaging stations in Connecticut with 10 or more of the riverine ecosystems. Policymakers and planners are years of record. Flow durations include the 99-, 98-, 97-, 95-, considering the needs of freshwater environments and have 90-, 85-, 80-, 75-, 70-, 60-, 50-, 40-, 30-, 25-, 20-, 10-, 5-, been establishing in-stream flow requirements to safeguard the and 1-percent exceedances. Low-flow frequencies include the rivers. In-stream flows are streamflows of a particular magni- 7-day, 10-year (7Q ) low flow; 7-day, 2-year (7Q ) low flow; tude, frequency, and timing that are necessary to ensure that a 10 2 river system remains environmentally healthy. To achieve the and 30-day, 2-year (30Q2) low flow. Streamflow estimates were computed for each station using data for the period of highest possible level of stream health for the designated class record through water year 2005. of stream use, the first challenge to is to analyze water avail- Estimates of low-flow statistics for 7 short-term (operated ability for the environment and for direct withdrawal and use. between 3 and 10 years) streamflow-gaging stations and 31 Streamflow statistics are an important tool used to assess water partial-record sites were computed. Low-flow estimates were availability. Determination of timely, relevant streamflow made on the basis of the relation between base flows at a statistics—flow durations, low-flow frequencies, and monthly short-term station or partial-record site and concurrent daily median streamflows—will provide information useful to state mean streamflows at a nearby index station. The relation is government and local officials in making water-resource, defined by the Maintenance of Variance Extension, type 3 regulatory, and other management decisions. (MOVE.3) method. Several short-term stations and partial- Flow durations and monthly median streamflows for record sites had poorly defined relations with nearby index Connecticut streams were last computed by the U.S. Geo- stations; therefore, no low-flow statistics were derived for logical Survey (USGS) more than 20 years ago (Randall and these sites. The estimated low-flow statistics for the short- others, 1966; Thomas, M.P., and others, 1967; Thomas, C.E., term stations and partial-record sites include the 99-, 98-, 97-, and others, 1968; Ryder and others, 1970, 1981; Cervione and 95-, 90-, and 85-percent flow durations; the 7-day, 10-year others, 1972; Wilson and others, 1974; Mazzaferro and oth- (7Q ) low flow; 7-day, 2-year (7Q ) low flow; and 30-day, ers, 1979; Weiss and others, 1982; and Handman and others, 10 2 1986). Low-flow frequencies for Connecticut streams were 2-year (30Q2) low-flow frequencies; and the August median flow. Descriptive information on location and record length, last computed in the early 1980s (Cervione, 1982; Weiss, measured basin characteristics, index stations correlated to 1983). Since these studies, an additional 20 years of stream- the short-term station and partial-record sites, and estimated flow data have been collected and new methods have been flow statistics are provided in this report for each station. developed for estimating low-flow statistics at short-term Streamflow estimates from this study are stored on USGS’s stations and partial-record sites. To update the streamflow World Wide Web application “StreamStats” (http://water.usgs. statistics, the USGS in cooperation with the Connecticut gov/osw/streamstats/connecticut.html). Department of Environmental Protection (DEP) and the New England Interstate Water Pollution Control Commission (NEIWPCC) conducted this study to compute flow durations, Introduction low-flow frequencies, and monthly median streamflows for Connecticut streams using data through water year1 2005. Management of water resources is undergoing significant 1 A water year is defined as the 12-month period October 1 through Septem- changes and broad restructuring as biologists, ecologists, and ber 30. The water year is designated by the calendar year in which it ends and hydrologists further the scientific understanding of natural which includes 9 of the 12 months. Thus, the year ending September 30, 2005 river flows and flow conditions necessary to sustain aquatic is termed the 2005 water year. 2 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Locations of streamgaging stations and partial-record sites 2006) was used for this study to compute the 99-, 98-, 97-, used in this study are shown on figure 1 . 95-, 90-, 85-, 80-, 75-, 70-, 60-, 50-, 40-, 30-, 25-, 20-, 10-, 5-, This report provides streamflow estimates for 91 con- and 1-percent exceedances. Flow durations were computed tinuous-record streamflow-gaging stations with 10 or more for the 91 stations for the period of record through water year years of record (hereinafter referred to as “streamgaging 2005 (table 2 in back of report). stations”), including (1) 99-, 98-, 97-, 95-, 90-, 85-, 80-, 75-, Flow durations are computed by sorting the daily mean 70-, 60-, 50-, 40-, 30-, 25-, 20-, 10-, 5-, and 1-percent flow streamflows for the period of record from the largest value durations; (2) 7-day, 10- and 2-year low flow and 30-day, to the smallest value and assigning each streamflow value a 2-year low-flow frequencies; and (3) monthly median stream- rank, starting with 1 for the largest value. The frequencies of flows. In addition, this report provides low-flow estimates for exceedance are then computed using the Weibull formula for 7 short-term stations with less than 10 years of record and computing plotting position (Helsel and Hirsch, 1992): 31 partial-record sites, including (1) 99-, 98-, 97-, 95-, 90-, and 85-percent flow durations; (2) 7-day, 10- and 2-year low P = 100 * [M / (n + 1)], (1) flow and 30-day, 2-year low-flow frequencies; and (3) August median streamflows (fig. 1). Methods used to estimate the where flow statistics at streamgaging stations and partial-record sites P = the probability that a given flow will be are described. The analyses are based on published stream- equaled or exceeded (percent of time), flow data collected through water year 2005. Estimates of M = the ranked position (dimensionless), flow durations, low-flow frequencies, and monthly median and streamflows are stored on USGS’s World Wide Web applica- n = the number of events for period of record tion “StreamStats” (http://water.usgs.gov/osw/streamstats/ (dimensionless). connecticut.html) (Ahearn, in press). To compare flow durations in different basins, streamflows are “normalized” to a streamflow per unit area. There- fore, the flow duration at each of the 91 streamgaging stations Streamflow Statistics at Stations with was divided by its respective drainage area. Normalized Continuous Record of 10 Years or More streamflows ranged from 0.01 to 0.42 cubic feet per second per square mile (ft3/s/mi2) at the 99-percent flow duration with Streamflow data for 91 streamgaging stations with 10 three statistical outliers (Guinea Brook and Safford Brook, 3 2 3 2 or more years of daily mean record (fig. 1; table 1 in back 0.0 ft /s/mi ; Clear Brook, 0.90 ft /s/mi ). Normalized stream- 3 2 of report) were retrieved from the USGS’s National Water flows ranged from 0.02 to 0.54 ft /s/mi at the 95-percent Inventory System (NWIS) (http://waterdata.usgs.gov/ct/nwis/ flow duration with one statistical outlier (Clear Brook, 3 2 nwis, accessed on September 12, 2006). At 70 percent of 1.19 ft /s/mi ). The drainage basins of Guinea Brook and Saf- the stations (64 of 91), streamflow is considered artificially ford Brook are predominately covered by glacial till (greater increased or decreased by water withdrawals, out-of-basin than 98 percent) and have little or no ground-water discharge transfers, point-source discharges, regulation, and (or) during dry weather. Clear Brook’s substantially greater reservoir operations; at 30 percent of the stations (27 of 91), normalized low flows compared to the other stations are high streamflow is considered natural with negligible anthropogenic because the ground-water drainage area is larger than the effects to the hydrologic flow regime. Throughout this surface-water drainage area. In addition, the drainage area of Clear Brook has a large percentage of glacial stratified depos- report, stations with natural flow conditions are referred to as its (44.6 percent) (table 7), and the ground-water discharge can “index stations or index basins.” Index stations can be used have a pronounced effect on streamflow. Another basin, South to evaluate water resources and characterize regional trends Branch Salmon Brook, exhibits similar low-flow characteris- in streamflow. In addition, index stations often are used to tics as Clear Brook. South Branch Salmon Brook (01192600) characterize streamflow on rivers where there is little or no also has greater normalized low flows because the ground- data. Currently (2007), USGS operates eight index stations in water drainage area is larger than the surface-water drainage Connecticut; the other 19 have been discontinued. area. In addition, the drainage area of South Branch Salmon Brook has a large percentage of glacial stratified deposits Flow Durations (about 65 percent) (table 7). Both Clear Brook and South Branch Salmon Brook have small surface-water drainage areas Flow durations represent the percentage of time that (less than 1 mi2) and are geographically close to each other. a given flow is equaled or exceeded without regard to the Median normalized streamflows (50-percent flow duration) sequence of recorded flows. Typically, flow durations char- ranged from 0.5 to 1.6 ft3/s/mi2 for 90 stations with one outlier acterize the range of flow rates for the period over which (Clear Brook, 2.5 ft3/s/mi2). Normalized streamflows ranged data were collected. Flow durations can be computed using from 3.7 to 7.3 ft3/s/mi2 and 6.2 to 18.4 ft3/s/mi2 at the 5- and commercially available statistical software. S-Plus (Insightful, 1-percent flow durations, respectively. Streamflow Statistics at Stations with Continuous Record of 10 Years or More 3 4 2 5 3 EXPLANATION 1 6 Rhode Island Index station and identifier Gaging station and identifier site and Partial-record identifier Short-term streamgaging station and identifier 33 11 16 9 74 8 7 31 32 26 34 29 37 35 25 28 9 46 30 36 39 38 72° 27 24 16 hames T River 17 41 42 19 23 40 18 22 43 21 20 11 44 13 15 12 10 98 97 14 92 82 96 Connecticut 94 52

93 r ive R

t 99 cu Massachusetts ti 84 ec 49

53 n n 90 o 83

85 C 74 102 100 50 54 91 101 103 89 73 81 81 87 78 80 86 51 76 45 79 88

75 r

o c R

70 t a i

g i v

n i e 72 m p r r a F i n 106

47 n 69 i u Q 105 62 61 65 New York New 67 68 104 48 64 107 108 60 59 66 55 63

73° 57 Sound Island Long 57 136 140 135

58 r ve 139 133 i 137 56 134 R ic n 138 to 126 132 sa u

o 130 129

H 141 127 131 MILES 123 122 128 110 20 112 142 143 125 111 113 146 146 147 144 124 KILOMETERS 121 109 145 120 114 114 119 20 116 115 10 148 118 10 117 0 0 Locations of all streamgaging stations and partial-record sites used to estimate flow durations, low-flow frequencies, mont hly median

Base from U.S. Geological Survey digital data, Base from U.S. Geological Survey 1:24,000, 1969–84, Connecticut State Plane projection New York New 42° 41° Figure 1. flows for selected streams in Connecticut through 2005. Reference numbers shown above are used to describe the stations tabl es 1–9. 4 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Overall, the index basins tend to have slightly smaller 7 consecutive days that has a 0.10 probability (1/recurrence normalized low flows than the basins where the hydrologic interval) of not being exceeded in a given year. The 7Q2 is the flow regime has been altered, with a few exceptions: basins annual minimum average flow for 2 consecutive days that has where the ground-water drainage area is larger than the a 0.50 probability of not being exceeded in a given year. The surface-water drainage area, and (or) those with a large 30Q2 is the annual minimum average flow for 30 consecu- percentage of glacial stratified deposits. Normalized flows tive days that has a 0.50 probability of not being exceeded in at the 99-percent flow duration for 25 of the 27 index a given year. The 7Q10 is used primarily in regulating waste basins were less than 0.16 ft3/s/mi2, with a median of disposal to streams. Under the Connecticut General Statutes 0.03 ft3/s/mi2. The sizes of the index basins range from 2.45 (CT Water Quality Standards, 22a-417, http://www.epa.gov/ to 100 mi2. For similar-size basins with altered flow, the waterscience/standards/wqslibrary/ct/ct_1_wqs.pdf), water- normalized 99-percent flow durations ranged from 0.01 to quality standards incorporate low-flow frequency statistics 0.42 ft3/s/mi2, with a median of 0.10 ft3/s/mi2. Basins such to ensure that water-quality standards are met and that to a as those of the Naugatuck, Quinnipiac, Still, and Housatonic limited degree, aquatic habitat is protected. Rivers have numerous point discharges and their streams The USGS computer program Surface Water Time exhibit some of the highest normalized flows at the 99-percent Series Statistics (SWSTAT; Lumb and others, 1990) was flow duration in the state (0.17 to 0.31 ft3/s/mi2). When used to compute the low-flow frequencies (http://water.usgs. comparing low flows from index stations and stations on gov/software/swstat.html, accessed on September 19, 2006). waste-receiving streams, it is expected that waste-receiving SWSTAT determines the annual series of minimum mean streams will exhibit higher low flows than might occur flows, ranks them, fits them to a log-Pearson type III distri- naturally because point-source discharges increase the natural bution, and plots the resulting line of fit through the annual flows of a river. Reduced river flows are attributed to water values. A conditional probability adjustment is made for days withdrawals, diversions, increased development, and (or) of zero flows. A determination of the data fit to the distribu- dams. Streamflows can be increased or decreased depending tion, and the eventual low-flow frequency values to be used upon the way the watershed is managed and water is allocated. are based on the professional judgment of the hydrologist. The To have a clearer explanation of the differences in the reliability of estimates of low-flow frequencies as an indicator hydrologic characteristics of basins with natural and altered of probable future conditions is closely related to the length flow conditions, an assessment of the different hydrologic of record used and whether the record is reasonably represen- flow regimes among rivers and extent of hydrologic alteration tative of long-term flow characteristics. When the period of is needed. record used to compute the low-flow statistics is sufficiently long (typically at least 10 years), the statistics can be an indicator of probable future conditions (Searcy, 1959). Low-Flow Frequencies Estimates of the 7Q10 for the 91 stations were compared to low-flow durations. For the majority (72 of 91) of stream- Low-flow frequencies typically are computed for stations gaging stations, 7Q estimates were less than the 99-percent by use of annual series of selected low flows based on the 10 flow duration. Seventeen stations had 7Q estimates between lowest mean flow for some number of consecutive days. Any 10 the 99- and 97-percent flow durations. The Housatonic River combination of number of days of mean minimum flow and (USGS streamgaging station 01205500) and Tenmile River years of recurrence may be used to determine the low-flow fre- (01200000) had slightly higher 7Q estimates between 95- quencies. The annual series for the determination of low-flow 10 and 90-percent flow duration and 90- and 85-percent flow frequencies for this study was based on a climatic year, which duration, respectively. is from April 1 of a given year to the following March 31. Use of a climatic year rather than a water year allows for an analysis of an uninterrupted low-flow period, which in Connecticut Monthly Median Streamflows typically occurs in late September and early October. Low-flow frequencies were computed for selected days Monthly median streamflows were computed for and frequencies for 91 streamgaging stations, with 10 or more 91 streamgaging stations as the median of individual daily years of continuous record (table 3 in back of report). Low- mean streamflows for all complete months during the period flow frequencies are based on the D-day, Y-year frequency of record at the station (table 4 in back of report). The August statistic of daily mean flow. This statistic is the minimum median flow is an important statistical measure for fisheries consecutive D-day mean flow expected to occur once in any and often is used for summer maintenance of aquatic habitat in Y-year or that has a probability of 1/Y of not being exceeded New England streams (U.S. Fish and Wildlife Service, 1981). in any given year. Three commonly used indices of low- To compare August median flows across basins, the flow frequencies were determined for this report: the 7-day, flows were divided by their respective drainage areas (“nor-

10-year low-flow frequency (7Q10); the 7-day, 2-year low-flow malized”). At the 27 index stations, the estimated normalized 3 2 frequency (7Q2); and the 30-day, 2-year low-flow frequency August median flows ranged from 0.06 to 0.96 ft /s/mi , with 3 2 (30Q2). The 7Q10 is the annual minimum average flow for a median of 0.19 ft /s/mi . Clear Brook, an index station with Estimation of Low-Flow Statistics at Short-Term Stations and Partial-Record Sites 5 a drainage area less than 1 mi2, was a statistical outlier with a base-flow measurements was too small for statistical analysis. normalized August median flow of 2.37 ft3/s/mi2. At the The 12 short-term stations and 34 partial-record sites that were 64 non-index stations (basins with flow alteration), the esti- identified as having natural or near-natural flows were used mated normalized August median flows ranged from 0.15 to in the correlation and MOVE.3 methods (fig. 2). Descriptive 1.77 ft3/s/mi2, with a median of 0.35 ft3/s/mi2. The normalized information for the short-term stations and partial-record sites August median flows were larger in basins with flow alteration is listed in tables 5 and 6 (in back of report), respectively. than the normalized August median flows in basins with natu- An index station used to estimate flows at short-term ral flow, indicating point-source discharges (e.g., wastewater stations and partial-record sites must satisfy several criteria: releases from sewage-treatment facilities or industry) may be (1) the flow is natural, (2) a portion of its period of record increasing August median flows. In addition, the data indi- coincides with that at the short-term station or partial-record cated a slightly larger range in the normalized August median site, and (3) its period of record is substantially longer than flows for larger basins (greater than 45 mi2) with flow altera- that of the short-term station or partial-record station. In tion—0.15 to 1.34 ft3/s/mi2 for basins less than 40 mi2 and 0.15 addition, the concurrent flows for the short-term stations or to 1.77 ft3/s/mi2 for basins between 45 and 100 mi2. A com- partial-record sites and index stations should plot linearly in mon time period was not used to compare flows normalized log-space and be highly correlated. Ideally, index stations by drainage area; therefore, the differences in flows per square would be geographically close to the partial-record site or mile between the stations with and without flow alteration are short-term station, have comparable drainage-area sizes, have partly attributed to the varying record lengths. the surface-water drainage area as determined by topography be coincident with the ground-water drainage area, and have similar geologic and hydrologic characteristics. Some short-term stations and partial-record sites cross Estimation of Low-Flow Statistics at state boundaries and have similar climatic and geologic Short-Term Stations and Partial-Record characteristics to index stations in adjacent states. A total of 38 index stations in Connecticut and adjacent states— Sites 27 stations in Connecticut, 4 in Massachusetts, and 7 in Rhode Island—were used to correlate concurrent flows with Estimates of streamflow often are needed for streamflow- the short-term stations and partial-record sites (fig. 2). Basin gaging stations with short periods of record that may not characteristics for index stations, short-term stations, and reflect long-term hydrologic conditions, or for partial-record partial-record sites are presented in table 7 (in back of report). sites with only a discrete number of base-flow measurements. Scatterplots of the log-transformed flows at each short- Through correlation and streamflow-record augmentation term station and partial-record site and same-day log-trans- methods, low-flow statistics for the short-term stations and formed daily mean flow at each of the index stations were partial-record sites can be estimated. Estimates can be made created to evaluate the relation between the sites. Because on the basis of the relation between base flow at the short-term streamflow data are highly skewed with a few very high station or base-flow measurements at the partial-record site values, a log transformation is commonly done to linearize the and concurrent daily streamflows at a nearby, hydrologically data. The pattern of the scatter in a linear relation indicates the similar index station. Because the relation is derived from base strength of the relation between the flows at the two stations: flows, the only estimated statistics for the short-term stations a narrow scatter band indicates a high degree of association and partial-record sites are low-flow statistics. For this study, between the flow at the two stations, and a wide scatter band the relation is defined by use of a streamflow-record augmen- indicates a lesser degree of association. When the scatter- tation method known as the Maintenance of Variance Exten- plots indicate a linear relation between the log-transformed sion, type 3 (MOVE.3) (Vogel and Stedinger, 1985). flows of the two stations, the MOVE.3 method can be used to Streamflow data for 12 streamgaging stations with daily develop an equation that relates flow at the short-term station mean records between 3 and 10 years, referred to as short- or partial-record site to that at the long-term index station. For term stations, were retrieved from the NWIS database stations with zero flows, a constant of 0.005 ft3/s was added to (http://waterdata.usgs.gov/ct/nwis/nwis, accessed on derive the linear relation of the log transformation of the data September 12, 2006). In Connecticut, the USGS operated and was then subtracted to compute the low-flow statistics a network of 90 partial-record sites from 1960 to 1980. using the MOVE.3 equation. Partial-record sites do not have continuous stage-recording Correlation coefficients were calculated and used as equipment, and only periodic streamflow measurements are indicators of linearity. MOVE.3 equations were developed for made. Streamflow measurements for these sites have been stations where the correlation coefficients were greater than published in the annual series of USGS water-data reports. 0.8; correlation coefficients less than 0.8 were considered Fifty-six of the 90 partial-record sites were excluded from less reliable. As an example, the MOVE.3 relation between a this statistical analyses because of flow alteration (water partial-record station, Haleys Brook (0118750), and an index withdrawals, diversions, reservoir operations, or point station, Pendleton Brook (01118300), is shown in figure 3. discharges) in the upstream basins or because the number of Generally, each short-term station and partial-record site was 6 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 4 2 3 5 1 Rhode Island 6 EXPLANATION 33 Index drainage basin Short-term drainage basin drainage basin Partial-record Index station and identifier site and identifier Partial-record station Short-term streamgaging and identifier 7 6 8 11 8 31 37 39 35 36 28 9 27 46 30 72° 24

16 hames T River 17 42 40 19 18 43 21 20 15 10 44 98 97 12 92 82 96 52 94 r ive R

93 95 t u

c 100

Massachusetts 90 ti Sound Island Long

84 c nne o

74 C 102 49 91 101 45 103

o c R

t a i

g i v n i e

m p r r a F ni 69 47 n Connecticut i u Q 48 61 64 62 New York New 107 60 66 73° 63 135

57 er iv 136 R ic n to sa u

128 o 123

127 H MILES 122 144 110 20 142 112 130 121 113 111 125 146 KILOMETERS 119 20 116 145 10 10 0 0 Locations of index stations, short-term and partial-record sites used for correlation base flows.

Base from U.S. Geological Survey digital data, Base from U.S. Geological Survey 1:24,000, 1969–84, Connecticut State Plane projection New York New Figure 2. 42° 41° Estimation of Low-Flow Statistics at Short-Term Stations and Partial-Record Sites 7

1.50

Same day streamflows

MOVE.3 relation

Correlation coefficient = 0.97 0.75

OF STREAMFLOW, IN CUBIC FEET PER SECOND -0.75 HALEYS BROOK (01118750) BASE-10 LOGARITHMIC TRANSFORMATION

-1.50 -1.50 -0.75 0 0.75 1.50

PENDLETON BROOK (01118300) BASE-10 LOGARITHMIC TRANSFORMATION OF STREAMFLOW, IN CUBIC FEET PER SECOND

Figure 3. An example of the MOVE.3 relation between a partial-record station, Haleys Brook (0118750), and an index station, Pendleton Brook (01118300). Both stations are in Connecticut.

correlated with one or more nearby index stations (table 8 in correlate or showed poor correlations with the index stations in back of report). One index station was chosen to develop the the region indicating that the index stations may not represent final MOVE.3 equation based on (1) correlation coefficient, the hydrologic characteristics of the river or provide use- (2) proximity of the index station to the short-term station or ful information that can be transferred to other sites to make partial-record site, (3) similarity in the drainage-area size and estimates of streamflow. Three partial-record sites—Fenton geologic characteristics of the basins, and (4) visual observa- River (01121350), Latimer Brook (01127790), and Patterson tion of the linear relation and residual plots. Brook (01208900)—had poorly defined relations to nearby Low-flow statistics 99-, 98-, 97-, 95-, 90-, and 85-percent index stations (correlation coefficients 0.8); subsequently, no flow durations; the 7-day, 10- and 2-year low flows, and the low-flow statistics were derived for these sites. Five short-term 30-day, 2-year low flow; and the August median flow were stations—Hop Brook (01189180), Podunk River (01190055), estimated at 31 of the 34 partial-record sites and at 7 of the 12 Deming Brook (01198860), Ledgy Brook (01198870), Wee- short-term stations (table 9 in back of report). The MOVE.3 keepeemee Brook (01203805)—had poorly defined relations mathematical method was used to estimate the low-flow statis- to nearby index stations (correlation coefficients 0.8) and no tics. Several short-term stations and partial-record sites did not low-flow statistics were derived for these stations. 8 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Summary Acknowledgments

Water-resources managers face considerable challenges The author thanks Gregory Granato of the USGS due to growing demands on finite freshwater supplies and the for providing valuable assistance with the Streamflow need to safeguard the riverine ecosystems. The state govern- Record Augmentation technique. Also, the author thanks ment in Connecticut is working to integrate water allocation Pamela Lombard and Amy McHugh of the USGS, and and use with protecting the ecological integrity of the state’s Lee Dunbar of the Connecticut Department of Environmental rivers. Current estimates of streamflow statistics at streamgag- Protection for providing technical reviews of the report. ing stations and partial-record sites will aid the state govern- Christopher Bellucci, Mary Becker, and Robert Gilmore ment in doing this. The U.S. Geological Survey (USGS), in provided help determining the extent of streamflow alteration cooperation with the Connecticut Department of Environmen- in various basins. tal Protection and New England Interstate Water Pollution Control Commission (NEIWPCC), computed streamflow statistics for 129 stream sites in Connecticut to provide informa- Selected References tion to state and local officials for water-resource, regulatory, and other management decisions. Flow durations, low-flow Ahearn, E.A., Ries, K.G., III, and Steeves, P.A., in press, frequencies, and monthly median flows were computed for StreamStats: U.S. Geological Survey Web application for 91 streamgaging stations (operated 10 or more years), 7 short- streamflow statistics in Connecticut: U.S. Geological term stations (operated less than 10 years), and 31 partial- Survey Fact Sheet 2006–3129, 4 p. record sites. Different methods were used for statistical analyses, depending on the type of station operated and quantity of Cervione, M.A., Jr., 1982, A method for estimating the 7-day, data collected. 10-year low flow of streams in Connecticut: Connecticut The estimated streamflow statistics for the 91 long-term Water Resources Bulletin, v. 34, 17 p. continuous-record streamgaging stations include the 99-, Cervione, M.A., Jr., Mazzaferro, D.L., and Melvin, R.L., 1972, 98-, 97-, 95-, 90-, 85-, 80-, 75-, 70-, 60-, 50-, 40-, 30-, 25-, Water resources inventory of Connecticut, Part 6, upper 20-, 10-, 5-, and 1-percent flow durations; the 7-day, 10- and Housatonic River basin: Connecticut Water Resources 2-year low flow frequency and the 30-day, 2-year low flow Bulletin, v. 21, 84 p. frequency; and monthly median flows. Streamflow estimates were computed for each station using data collected through Handman, E.H., Haeni, F.P., and Thomas, M.P., 1986, water year 2005. Water resources inventory of Connecticut, Part 9, Farming- ton River basin: Connecticut Water Resources Bulletin, Long-term streamgaging-station records provide the v. 29, 91 p. best data for estimating the magnitude and probability of flows; however, for many proposed water-resources proj- Hardison, C.H., and Moss, M.E., 1972, Accuracy of low- ects, only a short record or a limited number of discrete flow flow characteristics estimated by correlation of base-flow measurements may be available. Through correlation and measurements, Manual of Hydrology—Part 2, Low-flow a streamflow-record augmentation method, referred to as techniques: U.S. Geological Survey Water-Supply Paper the Maintenance of Variance Extension (MOVE.3) method, 1542–B, p. 35–55. low-flow statistics were estimated for short-term stations and Helsel, D.R., and Hirsch, R.M., 1992, Statistical methods in partial-record sites based on of the relation between base-flow water resources: Studies in Environmental Science, v. 49, measurements at the partial-record site or daily mean (base) New York, Elsevier Science Publishers, 529 p. flows at the short-term station and concurrent daily streamflows at a nearby, hydrologically similar index station. Hirsch, R.M., 1982, A comparison of four streamflow record The estimated low-flow statistics for the 7 short-term extension techniques: Water Resources Research, v. 18, stations and 31 partial-record sites include the 99-, 98-, 97-, no. 4, p. 1,081–1,088. 95-, 90-, and 85-percent flow durations; the 7-day, 10-year Insightful, Inc., 2006, SPLUS version 7 modern statistics and low flow; 7-day, 2-year low flow; and 30-day, 2-year low-flow advanced graphics: Cambridge, Mass., 558 p. frequencies; and the August median flow. Low-flow statistics could not be estimated for some short-term stations and Lumb, A.M., Kittle, J.L., Jr., and Flynn, K.M., 1990, Users partial-record sites because base-flow relations with the index manual for ANNIE, a computer program for interactive stations did not correlate or showed low correlations indicating hydrologic analyses and data management: U.S. Geologi- that the index stations may not represent the hydrologic char- cal Survey Water-Resources Investigations Report 89–4080, acteristics of these short-term stations or partial-record sites. 236 p. Selected References 9

Mazzaferro, D.L., Handman, E.H., and Thomas, M.P., 1979, Soller, D.R., and Packard, P.H., 1998, Digital representation Water resources inventory of Connecticut, Part 8, of a map showing the thickness and character of Quaternary Quinnipiac River basin: Connecticut Water Resources sediments in the glaciated United States east of the Rocky Mountains: U.S. Geological Survey Digital Data Series Bulletin, v. 27, 88 p. DDS–38, one CD-ROM.

Randall, A.D., Thomas, M.P., Thomas, C.E., Jr., and Stone, J.R., Schafer, J.P., London, E.H., and Thompson, W.B., Baker, J.A., 1966, Water resources inventory of Connecti- 1992, Surficial materials map of Connecticut: U.S. Geo- cut, Part 1, Quinebaug River basin: Connecticut Water logical Survey Special Map, 2 sheets, scale 1:125,000. Resources Bulletin, v. 8, 102 p. Thomas, C.E., Jr., Cervione, M.A., Jr., and Grossman, I.G., Ries, K.G., III, 1994a, Estimation of low-flow duration dis- 1968, Water resources inventory of Connecticut, Part 3, charges in Massachusetts: U.S. Geological Survey Water- lower Thames and southeastern coastal river basins: Connecticut Water Resources Bulletin, v. 15, 105 p. Supply Paper 2175, 50 p. Thomas, M.P., Bednar, G.A., Thomas, C.E., Jr., and Ries, K.G., III, 1997, August median streamflows in Massa- Wilson, W.E., 1967, Water resources inventory of chusetts: U.S. Geological Survey Water-Resources Investi- Connecticut, Part 2, Shetucket River basin: Connecticut gations Report 97–4190, 27 p. Water Resources Bulletin, v. 11, 96 p.

Ries, K.G., III, 1999, Streamflow measurements, basin Thomas, W.O., Jr., and Stedinger, J.R., 1991, Estimating low- characteristics, and streamflow statistics for low-flow flow characteristics at gaging stations and through the use partial-record stations operated in Massachusetts from 1989 of base-flow measurements: U.S. Geological Survey Open- File Report 91–244, p. 197–205. through 1996: U.S. Geological Survey Water-Resources Investigations Report 99–4006, 162 p. U.S. Fish and Wildlife Service, 1981, Interim regional policy for New England streamflow recommendations: Newton Riggs, H.C., 1972, Low-flow investigations: U.S. Geological Corner, Mass., U.S. Fish and Wildlife Service, 3 p. Survey Techniques of Water-Resources Investigations, Vogel, R.M., and Stedinger, J.R., 1985, Minimum book 4, chap. B1, 18 p. variance streamflow record augmentation procedures: Ryder, R.B., Cervione, M.A., Jr., Thomas, C.E., Jr., and Water Resources Research, v. 21, no. 5, p. 715–723. Thomas, M.P., 1970, Water resources inventory of Connect- Weiss, L.A., 1983, Evaluation and design of a streamflow data icut, Part 4, southwestern coastal river basins: Connecticut network for Connecticut: Connecticut Water Resources Water Resources Bulletin, v. 17, 54 p. Bulletin, v. 36, 30 p.

Ryder, R.B., Thomas, M.P., and Weiss, L.A., 1981, Water Weiss, L.A., Bingham, J.W., and Thomas, M.P., 1982, resources inventory of Connecticut, Part 7, upper Connecti- Water resources inventory of Connecticut, Part 10, lower Connecticut River basin: Connecticut Water Resources cut River basin: Connecticut Water Resources Bulletin, Bulletin, v. 31, 85 p. v. 24, 78 p. Wilson, W.E., Burke, E.L., and Thomas, C.E., Jr., 1974, Searcy, J.K., 1959, Flow-duration curves. Manual of hydrol- Water resources inventory of Connecticut, Part 5, lower ogy—Part 2, Low-flow techniques: U.S. Geological Survey Housatonic River basin: Connecticut Water Resources Water-Supply Paper 1542–A, 33 p. Bulletin, v. 19, 79 p.

Tables 1–9 12 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

) 2 4.02 4.15 7.03 0.59 (mi area 74.8 28.6 30 35.8 57.8 83.6 17 53 89.3 10.4 15.5 98.2 18.5 85 19.9 23.5 121 174 404 155 172 328 713 131 217 Drainage 9,660

Period of record Oct 1998–Sep 2001 Oct 1931–Sep 2005 Oct 1932–Oct 1971 Oct 1950–Oct 1981 Oct 1940–Sep 2005 Oct 1930–Sep 1989, 1995–Sep 2005 Oct 1928–Sep 2005 Oct 1951–Sep 2005 Oct 1931–Sep 2005 May 1984–Sep 2000, Oct 2000–Sep 2005 1961–Sep 1971 Aug Jan 1930–Sep 1969, Oct 1995–Sep 2005 1937–Oct 1971 Nov Oct 1932–Oct 1971 Oct 1963–Oct 1976 1961–Oct 1973 Aug Oct 1918–Sep 2005 Oct 1930–Sep 2005 Aug 1928–Sep 2005 May 1981–Sep 2005 Aug 1961–Sep 1976, May 1982–Sep 2005 Oct 1928–Oct 1971 Oct 1955–Sep 2005 Oct 1956–Sep 1969 Oct 1948–Jul 1967, Jul 1969–Sep 2005 Oct 1929–Sep 1955 1938–Sep 1955, Oct 1956–Sep 2005 Jan Oct 1940–Sep 1972 Oct 1921–Sep 1955, 1958–Sep 1972, Oct 1921–Oct 1973, 1998–Sep 2001 Oct 1958–Sep 2005 of 47 74 39 31 65 69 77 54 74 29 10 50 34 39 13 12 87 75 77 24 39 43 50 13 55 26 66 32 52 55 Years Years record Town Mansfield Columbia Woodstock Ashford Windham Windham Canterbury Thompson Thompson Putnam Putnam Killingly Plainfield Brooklyn Griswold Griswold Norwich Suffield Suffield East Windsor East Windsor Barkhamsted Winchester Colebrook Barkhamsted Hartland Hartland New Hartford Burlington North Stonington River name Pendleton Brook Pendleton River Willimantic Hop River Brook Safford Mount Hope River Natchaug River River Shetucket Little River Quinebaug River Quinebaug River Little River Quinebaug River River Fivemile Moosup River Blackwell Brook River Pachaug Quinebaug River River Yantic Connecticut River Brook Stony Broad Brook Scantic River River Branch Farmington West Mad River Still River River Branch Farmington West River Hubbard Brook Valley Nepaug River Clear Brook indicates Index Station] indicates Index bold degrees) (decimal Longitude -71.8342 -72.2656 -72.3023 -72.0570 -72.1690 -72.1956 -72.1820 -72.0523 -71.9556 -71.9004 -71.9301 -71.9129 -71.8853 -71.8859 -71.9565 -71.9334 -71.9842 -72.1215 -72.6054 -72.7104 -72.5500 -72.5629 -73.0176 -73.0818 -73.0340 -73.0137 -72.9390 -72.9298 -72.9701 -72.9512 , square miles; 2 Latitude 41.7507 41.7276 41.9265 41.8437 41.7198 41.7004 41.6718 42.0223 41.9434 41.9276 41.9093 41.8373 41.7104 41.7654 41.5848 41.5979 41.5587 41.9873 41.9607 41.9139 41.9118 41.9629 41.9309 41.9673 41.9537 42.0373 42.0343 41.8207 41.7957 41.4748 degrees) (decimal

USGS station number 01119500 01120000 01120500 01121000 01122000 01122500 01123000 01124000 01124151 01125490 01125500 01126000 01126500 01126600 01126950 01127000 01127500 01184000 01184100 01184490 01184500 01186000 01186100 01186500 01187000 01187300 01187400 01187800 01187850 01118300 Descriptions of streamgaging stations with 10 or more years continuous record in Connecticut used to compute flow durations, low-flow frequencies, and monthly

7 13 14 16 19 22 23 24 25 26 28 29 32 34 35 37 38 41 50 51 53 54 55 56 58 59 60 61 63 64 Map (fig. 1) number reference Table 1. Table median flow statistics.—Continued mi [USGS, U.S. Geological Survey; Table 1 13

) 2 4.1 2.65 5.54 0.94 2.62 5.68 6.55 (mi area 45.8 39.5 67.4 14.6 14.6 39.9 26.8 72.5 73.4 24.3 46.5 29.8 34.7 20.1 22.3 11.2 17.4 360 378 577 590 100 115 Drainage

Period of record Aug 1976–Sep 2005 Oct 1931–Sep 2005 Oct 1977–Sep 2005 Oct 1941–Sep 2005 Oct 1963–Oct 1976 Oct 1946–Sep 1963 Oct 1971–Sep 2005 Oct 1928–Feb 1988 Jun 1958–Oct 1971 May 1958–Oct 1971 May 1958–Oct 1971 Oct 1936–Oct 1981 May 1958–Oct 1971 1936–Sep 1986 Nov Oct 1936–Oct 1981 Oct 1919–Sep 1921, 1928–Oct 1971, Oct 1960–Sep 1976 Oct 1961–Sep 1971 Oct 1961–Sep 1971 Dec 1980–Sep 2005 Oct 1961–Dec 1980 Oct 1928–Sep 2005 1960–Oct 1976 Jul Oct 1937–Sep 1966 Oct 1937–Sep 1981, Sep 2002–Sep 2005 Oct 1941–Sep 1963, 1965–Sep 1967 1981–Sep 2005 Nov 1981 Sep 1961–Nov 1987–Sep 2005 Nov Oct 1930–Sep 2005 Nov 1962–Sep 1977 Nov of 15 74 28 64 13 17 34 59 13 13 13 45 13 50 25 74 16 10 10 25 19 77 16 29 48 24 24 20 18 75 Years Years record Town Burlington Farmington Bristol Granby East Granby Simsbury Windsor Newington Newington Hartford West Hartford Bloomfield Hartford Hartford East Hartford Glastonbury Glastonbury Berlin Middlefield Middlefield East Hampton East Haddam East Haddam Lyme Clinton Clinton Madison Southington Wallingford Avon River name Farmington River Farmington Burlington Brook River Farmington River Pequabuck East Branch Salmon Brook Salmon Brook River Farmington River Farmington Piper Brook Mill Brook Brook Trout River South Branch Park Brook Wash River North Branch Park River Park Hockanum River South Branch Salmon Brook Roaring Brook Mattabesset River Coginchaug River Coginchaug River Salmon River Brook Hemlock Valley Eightmile River East Branch Eightmile River River Menunketesuck Indian River Neck River Quinnipiac River Quinnipiac River indicates Index Station] indicates Index bold degrees) (decimal Longitude -72.9254 -72.9648 -72.8868 -72.9007 -72.7795 -72.7762 -72.7607 -72.6873 -72.7370 -72.7257 -72.7370 -72.7137 -72.7393 -72.7081 -72.6945 -72.5873 -72.5398 -72.5843 -72.7129 -72.7059 -72.6873 -72.4493 -72.4226 -72.3329 -72.3342 -72.5154 -72.5312 -72.6193 -72.8837 -72.8409 , square miles; 2 Latitude 41.7862 41.7559 41.6732 41.9543 41.9373 41.9084 41.9115 41.7120 41.7045 41.7704 41.7340 41.8254 41.7843 41.7601 41.7832 41.7182 41.6640 41.6190 41.5201 41.5362 41.5523 41.4284 41.4418 41.4279 41.3029 41.3059 41.2826 41.6018 41.4495 41.7993 degrees) (decimal

USGS station number 01188000 01188090 01189000 01189390 01189500 01189995 01190000 01190100 01190200 01190300 01190500 01190600 01191000 01191500 01192500 01192600 01192650 01192700 01192883 01192890 01193500 01193800 01194000 01194500 01195000 01195100 01195200 01195490 01196500 01187980 Descriptions of streamgaging stations with 10 or more years continuous record in Connecticut used to compute flow durations, low-flow frequencies, and monthly

66 67 68 70 71 72 73 75 76 77 78 79 80 81 83 84 85 86 88 89 94 96 97 98 99 65 100 103 104 105 Map (fig. 1) number reference Table 1. Table median flow statistics.—Continued mi [USGS, U.S. Geological Survey; 14 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

) 2 3.5 9.24 2.45 7.38 (mi area 18 24.5 45.9 29.4 23.8 67.5 17.7 75.1 33.8 13.6 71 19.6 24.3 99.8 20.8 16.3 10.6 28.6 21 79.8 30 634 203 996 132 260 Drainage 1,544

Period of record Aug 2000–Sep 2000, Oct 2001–Sep 2005 Oct 1968–Sep 1970, 1978–Sep 2005 Oct 1949–Oct 1971 Oct 1912–Sep 2005 Oct 1961–Sep 2005 1960–Oct 1981 Aug Oct 1929–Sep 1987, 1991–Sep 2005 Oct 1940–Sep 2005 Oct 1962–Sep 1972 Oct 1931–Sep 1966 Oct 1967–Oct 1981 Oct 1930–Sep 1971 Oct 1962–Sep 1976, 1978–Sep 1979, Oct 1932–Sep 2005 Oct 1958–Oct 1976 Oct 1928–Sep 2005 Oct 1956–Sep 1992, 1993–Apr 1997 Oct 1956–Apr 1997 Oct 1930–Sep 1959 Oct 1960–Oct 1973 Oct 1930–Sep 1959 Oct 1960–Sep 2005 Oct 1974–Oct 1989, Apr 1993–May 1993 Oct 1969–Oct 1989 Oct 1918–Sep 1924, 1928–Sep 2005 Apr 1977–Sep 2005 Oct 1972–Sep 2005 Oct 1964–Sep 2005 Oct 1964–Sep 2005 Oct 1932–Sep 1967 Sep 1962–Sep 2005 Sep 1962–Sep 1973 of 11 29 22 93 44 21 72 65 10 35 14 41 19 73 18 77 40 41 29 13 29 45 15 20 83 28 33 41 41 35 43 Years Years record Town Hamden North Canaan Salisbury Salisbury Sharon York New Wingdale, Milford New New Milford Milford New Goshen Roxbury Woodbury Southbury Monroe Oxford Torrington Torrington Thomaston Harwinton Thomaston Thomaston Watertown Naugatuck Beacon Falls Trumbull Fairfield Fairfield Redding Westport Wilton North Haven River name Muddy River Mill River Blackberry River Housatonic River Salmon Creek Guinea Brook River Tenmile Housatonic River Aspetuck River West Still River Marshepaug River Shepaug River River Nonewaug Pomperaug River Copper Mill Brook Housatonic River River Brook Naugatuck West River East Branch Naugatuck River Naugatuck Leadmine Brook Leadmine Brook River Naugatuck Branch Brook Hop Brook River Naugatuck Rooster River Mill River Sasco Brook Saugatuck River River Saugatuck River Norwalk indicates Index Station] indicates Index bold degrees) (decimal Longitude -72.8415 -72.9029 -73.3418 -73.3693 -73.3910 -73.4301 -73.5289 -73.4898 -73.4246 -73.4182 -73.2590 -73.2936 -73.1787 -73.2246 -73.2184 -73.1676 -73.1234 -73.1179 -73.0643 -73.0532 -73.0573 -73.0696 -73.0948 -73.0582 -73.0626 -73.2190 -73.2704 -73.3059 -73.3951 -73.3662 -73.4193 , square miles; 2 Latitude 41.4209 42.0240 41.9573 41.9423 41.8243 41.6589 41.6531 41.6079 41.5201 41.7895 41.7233 41.5757 41.4807 41.3629 41.3840 41.8009 41.8034 41.7043 41.7295 41.7018 41.6737 41.6537 41.5059 41.4423 41.1798 41.1657 41.1529 41.2945 41.1709 41.1637 41.3687 degrees) (decimal

USGS station number 01196620 01198500 01199000 01199050 01199200 01200000 01200500 01201190 01201500 01201930 01203000 01203600 01204000 01204800 01205500 01205600 01205700 01206000 01206400 01206500 01206900 01208013 01208420 01208500 01208873 01208925 01208950 01208990 01209500 01209700 01196580 Descriptions of streamgaging stations with 10 or more years continuous record in Connecticut used to compute flow durations, low-flow frequencies, and monthly

108 109 114 115 116 117 118 119 120 122 124 126 129 130 131 132 133 134 135 136 137 138 139 140 141 143 144 145 147 148 106 Map (fig. 1) number reference Table 1. Table median flow statistics.—Continued mi [USGS, U.S. Geological Survey; Table 2 15 1 4.20 50.0 76.0 1,170 785 357 1,900 3,960 360 1,380 1,710 333 2,800 438 852 212 476 6,120 1,180 86,100 160 115 635 1,160 228 1,160 2,450 342 109 270 5 3.10 26.0 30.0 97.0 70.0 58.0 94.0 50.0 609 400 165 950 2,230 167 816 964 166 1,620 270 471 271 3,700 532 52,500 390 582 554 1,230 146 128 10 2.70 19.0 18.0 66.0 45.0 43.0 63.0 93.0 30.0 88.0 450 283 113 675 1,590 115 607 680 115 1,200 207 350 204 2,790 368 36,900 290 451 371 863 20 2.20 13.0 10.0 75.0 80.0 71.0 44.0 27.0 33.0 35.0 54.0 19.0 55.0 317 183 451 1,070 416 450 830 150 239 150 1,960 239 24,300 196 350 239 555 25 8.50 2.10 11.0 65.0 69.0 56.0 38.0 22.0 29.0 28.0 43.0 16.0 46.0 277 155 388 919 358 388 711.5 131 203 130 1,700 200 20,900 170 313 201 468 30 9.80 7.00 1.90 56.0 60.0 46.0 33.0 19.0 26.0 23.0 36.0 13.0 40.0 245 133 337 800 311 335 620 116 178 115 1,500 172 18,600 150 283 173 403 40 7.60 5.00 9.60 1.70 42.0 47.0 34.2 91.0 25.0 94.0 13.0 22.0 16.0 26.0 29.0 190 100 256 612 240 251 477 138 1,170 129 15,000 119 240 131 313 50 5.70 3.60 9.60 7.20 1.50 73.0 31.0 36.0 25.0 71.0 18.0 73.0 95.0 18.0 95.0 11.0 20.0 22.0 148 193 465 184 189 369 107 910 12,550 204 101 240 60 4.00 2.40 6.70 7.40 5.00 1.30 52.0 22.0 26.0 18.0 55.0 80.0 12.0 57.0 68.0 16.0 76.0 77.0 14.0 16.0 111 136 340 135 140 274 695 10,500 170 182 2.50 1.50 7.50 4.50 4.40 8.50 3.00 1.10 70 82.0 36.0 14.0 95.0 19.0 94 11.0 43.0 54.0 39.0 46.0 14.0 62.0 57.0 11.0 243 101 195 510 8,660 144 140 75 1.80 1.10 8.20 5.60 3.50 3.40 6.50 2.20 8.80 1.10 67.0 28.0 11.0 77.0 16.0 77.0 84.0 38.0 41.0 28.0 36.0 13.0 56.0 48.0 199 165 440 7,760 128.5 122 80 1.30 0.77 8.20 6.20 4.00 2.60 2.80 4.80 1.60 6.90 0.97 54.0 21.0 60.0 13.0 62.0 66.0 33.0 32.0 21.0 26.0 12.0 50.0 39.0 162 136 366 6,810 112 110 indicates Index Station] indicates Index 85 0.91 0.51 6.00 4.40 3.00 1.80 2.10 3.40 1.00 5.50 0.88 44.0 15.0 48.0 11.0 49.0 52.0 27.0 24.0 16.0 18.0 11.0 43.0 92.0 31.0 95.0 130 110 298 5,840 bold 90 0.57 0.31 4.10 8.90 2.92 2.10 1.20 9.80 1.50 2.40 0.80 4.30 0.79 Streamflow equaled or exceeded at indicated percentage of time, in cubic feet per second 34.0 11.0 36.0 37.0 39.0 84 20.0 18.0 12.0 13.0 36.0 70.0 23.0 78.0 103 232 4,890 95 0.30 7.80 0.15 2.50 7.10 1.70 1.30 9.00 9.40 0.65 8.30 0.90 1.50 0.50 2.80 0.70 25.0 24.0 75.0 26.0 28.0 59 12.0 12.0 30.0 48.0 15.0 58.0 , square miles; 147 3,770 2 97 0.18 6.30 0.10 1.90 6.10 1.04 8.80 8.80 1.00 8.00 7.80 0.46 7.70 0.66 1.10 0.40 2.10 0.61 20.0 17.0 61.0 22.0 24.0 48 25.0 31.9 12.0 49.0 110 3,340 98 0.12 5.60 0.05 1.50 5.50 0.90 7.40 7.40 0.85 4.00 6.80 0.40 7.10 0.50 0.84 0.40 1.80 0.53 17.0 11.0 54.0 19.0 21.0 42 94.0 23.0 22.0 11.0 43.0 3,100 99 0.07 4.30 0.02 1.10 6.00 4.90 0.60 5.60 5.80 0.70 0.76 5.80 0.28 6.50 0.40 8.50 0.56 0.30 1.50 0.53 13.0 45.0 15.0 18.0 35.7 53.0 20.0 15.0 37.0 2,820 - ) 2 4.02 4.15 7.03 0.59 age (mi area 74.8 28.6 30 35.8 57.8 83.6 17 53 89.3 10.4 15.5 98.2 18.5 85 19.9 23.5 Drain 121 174 404 155 172 328 713 9,660 131 217

of 47 74 39 31 65 69 77 54 74 29 10 50 34 39 13 12 87 75 77 24 39 43 50 13 55 26 66 32 52 55 Years Years record

River name Farmington River Farmington River Farmington Pendleton Brook Pendleton River Willimantic Hop River Brook Safford Mount Hope River Natchaug River River Shetucket Little River Quinebaug River Quinebaug River Little River Quinebaug River River Fivemile Moosup River Blackwell Brook River Pachaug Quinebaug River River Yantic Connecticut River Brook Stony Broad Brook Scantic River Branch West Mad River Still River Branch West River Hubbard Brook Valley Nepaug River Clear Brook USGS Flow-duration statistics for 91 streamgaging stations with 10 or more years of continuous record in Connecticut. station number 01118300 01119500 01120000 01120500 01121000 01122000 01122500 01123000 01124000 01124151 01125490 01125500 01126000 01126500 01126600 01126950 01127000 01127500 01184000 01184100 01184490 01184500 01186000 01186100 01186500 01187000 01187300 01187400 01187800 01187850

- 7 13 14 16 19 22 23 24 25 26 28 29 32 34 35 37 38 41 50 51 53 54 55 56 58 59 60 61 63 64 Map ence refer (fig. 1) number Table 2. Table mi year 2005; USGS, U.S. Geological Survey; [Statistics based on data through water 16 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 1 5.86 61.0 31.0 61.0 34.0 69.0 85.0 2,850 3,220 500 358 774 5,380 5,180 155 146 499 390 878 508 191 454 380 475 1,160 261 287 148 192 1,190 5 3.70 26.0 69.0 11.0 67.0 25.0 16.0 69.0 31.0 38.0 88.0 1,790 1,810 230 182 388 3,160 2,890 215 144 398 290 102 197 203 209 569 119 140 582 6.10 3.00 10 17.0 48.0 47.0 15.0 80.0 73.0 12.0 85.0 49.0 22.0 27.0 61.0 1,300 1,300 161 134 272 2,350 2,110 144 258 222 138 139 149 402 101 420 3.60 8.10 2.30 8.00 20 11.0 97.0 33.0 30.0 93.0 41.0 49.0 85.0 86.0 93.0 58.0 68.0 33.0 15.0 17.0 42.0 872 879 106 163 1,630 1,450 158 164 274 295 9.20 3.10 6.90 2.00 6.90 25 92.0 85.0 28.0 26.0 80.0 33.0 41.0 74.0 72.0 75.0 50.0 58.0 28.0 13.0 15.0 37.0 758 761 134 1,410 1,240 132 146 236 257 8.00 2.70 5.70 1.80 6.00 30 81.0 75.0 23.0 22.0 70.0 27.0 36.0 67.0 62.0 63.0 43.0 50.0 24.0 11.0 12.0 33.0 675 675 116 1,240 1,090 114 131 205 229 6.40 2.20 4.30 1.50 4.50 8.00 9.30 40 64.0 58.0 92.0 17.0 18.0 55.0 19.0 87.0 28.0 54.0 48.0 46.0 33.0 39.0 18.0 27.0 544 555 990 866 106 157 187 50 5.00 1.80 3.20 1.20 3.30 5.80 6.60 50.0 43.0 72.0 13.0 15.0 45.0 14.0 68.0 87.0 20.0 46.0 35.0 34.0 24.0 29.0 13.0 23.0 459 474 802 708 116 151 60 3.80 1.50 2.30 1.00 2.20 7.70 4.10 4.30 40.0 31.0 56.0 10.0 12.0 36.0 10.0 54.0 73.0 15.0 39.0 26.0 23.0 83.0 16.0 20.0 19.0 374 406 684 585 122 2.80 8.80 1.20 9.50 1.70 7.40 0.86 1.40 8.70 4.30 2.20 2.50 70 31.0 23.0 43.0 29.0 43.0 61.0 12.0 33.0 17.0 14.0 54.0 12.0 15.0 98.0 302 350 588 465 75 2.40 8.00 1.10 8.50 1.40 6.10 0.79 1.10 6.70 9.00 3.30 1.60 2.00 28.0 20.0 37.0 26.0 38.0 55.0 11.0 31.0 13.0 11.0 42.0 13.0 88.0 273 324 540 409 80 2.00 7.20 1.00 7.30 1.10 5.10 0.71 9.50 9.70 8.80 0.79 5.00 6.80 2.50 1.10 1.40 25.0 17.0 32.0 24.0 34.0 50.0 28.0 32.0 11.0 79.0 235 297 492 354 indicates Index Station] indicates Index 85 1.70 6.40 0.84 6.10 0.80 4.20 0.62 8.30 7.00 6.70 0.55 3.50 4.90 1.90 0.75 0.98 9.80 22.0 14.0 28.0 21.0 30.0 45.0 26.0 25.0 70.0 180 262 437 297 bold 90 1.30 5.50 0.73 5.30 0.58 3.30 0.51 7.40 4.78 5.00 0.40 2.50 3.40 1.30 0.50 0.60 8.10 Streamflow equaled or exceeded at indicated percentage of time, in cubic feet per second 20.0 12.0 24.0 19.0 27.0 39.0 24.0 19.0 61.0 131 211 375 244 95 1.00 4.20 0.60 4.20 0.35 2.20 0.42 6.40 2.60 3.30 0.30 1.60 1.90 0.70 0.29 0.29 6.30 75.0 17.0 10.0 19.0 16.0 23.0 31.0 21.0 13.0 50.0 , square miles; 171 297 188 2 97 0.88 9.00 3.20 0.58 3.10 0.25 1.70 0.36 5.40 1.90 2.70 0.25 1.30 1.40 0.40 0.20 0.15 5.40 50.4 16.0 17.0 14.0 21.0 26.0 20.0 10.0 44.0 155 265 132 98 0.78 8.50 2.60 0.53 2.50 0.19 1.40 0.33 4.90 1.50 2.30 8.50 0.22 1.00 1.10 0.30 0.15 0.11 5.10 40.0 15.0 15.0 78.0 13.0 20.0 23.0 18.0 41.0 140 241 99 0.65 7.90 1.90 0.48 1.70 0.07 1.00 0.31 4.40 1.17 2.00 6.50 0.20 0.60 0.65 0.15 0.10 0.06 4.60 27.0 14.0 13.0 25.0 11.0 18.0 18.0 17.0 36.0 124 200 - ) 2 4.1 2.65 5.54 0.94 2.62 5.68 6.55 age (mi area 45.8 39.5 67.4 14.6 14.6 39.9 26.8 72.5 73.4 24.3 46.5 29.8 34.7 20.1 22.3 11.2 17.4 Drain 360 378 577 590 100 115

of 15 74 28 64 13 17 34 59 13 13 13 45 13 50 25 74 16 10 10 25 19 77 16 29 48 24 24 20 18 75 Years Years record

River name Brook River River Salmon Brook Brook Eightmile River River Farmington River Farmington Burlington Brook River Farmington River Pequabuck East Branch Salmon Salmon Brook River Farmington River Farmington Piper Brook Mill Brook Brook Trout South Branch Park Brook Wash North Branch Park River Park Hockanum River South Branch Roaring Brook Mattabesset River Coginchaug River Coginchaug River Salmon River Hemlock Valley Eightmile River East Branch Menunketesuck Indian River Neck River Quinnipiac River Quinnipiac River USGS Flow-duration statistics for 91 streamgaging stations with 10 or more years of continuous record in Connecticut.—Continued station number 01187980 01188000 01188090 01189000 01189390 01189500 01189995 01190000 01190100 01190200 01190300 01190500 01190600 01191000 01191500 01192500 01192600 01192650 01192700 01192883 01192890 01193500 01193800 01194000 01194500 01195000 01195100 01195200 01195490 01196500

- 65 66 67 68 70 71 72 73 75 76 77 78 79 80 81 83 84 85 86 88 89 94 96 97 98 99 Map 100 103 104 105 ence refer (fig. 1) number Table 2. Table mi year 2005; USGS, U.S. Geological Survey; [Statistics based on data through water Table 2 17 1 46.0 37.2 211 354 555 5,340 283 785 8,240 204 600 126 1,360 238 850 12,700 471 182 1,020 247 358 1,570 383 280 3,090 135 273 100 258 808 392 5 97.0 24.0 60.0 99.0 16.0 88.0 49.0 44.0 147 241 3,220 141 400 4,940 152 348 725 398 7,400 211 470 116 167 676 109 116 1,630 121 129 416 178 10 62.0 98.0 17.0 79.0 45.0 65.0 11.0 55.0 81.0 67.0 70.0 30.0 85.0 29.0 92.0 160 2,390 101 283 3,670 250 530 275 5,900 138 310 110 435 1,110 296 125 6.80 20 38.0 65.0 70.0 11.0 53.0 32.0 42.0 84.0 35.0 52.0 67.0 43.0 44.0 19.0 53.6 19.0 60.0 82.0 101 1,620 183 2,530 164 354 185 4,140 195 267 724 190 9.20 5.70 25 31.0 56.0 83.0 61.0 44.0 27.0 35 69.0 29.0 45.0 56.0 37.0 37.0 16.0 45.0 16.0 50.0 69.0 1,400 155 2,190 140 300 159 3,630 161 224 624 155 7.80 4.90 30 26.0 48.2 71.0 53.0 38.0 24.0 30 58.0 25.0 38.0 47.0 32.0 33.0 14.0 38.0 14.0 44.0 59.0 1,210 133 1,910 123 257 139 3,180 139 193 538 127 5.50 3.80 40 19.0 38.0 52.4 41.0 29.0 96.0 17.0 23 43.0 19.0 30.0 35.0 23.0 26.0 12.0 28.0 11.0 34.0 85.0 44.0 939 100 1,480 189 106 2,450 103 149 416 50 3.80 2.80 9.40 7.90 13.0 29.0 40.0 32.0 73.0 21.0 75.0 12.0 16 80.0 32.0 15.0 76.0 23.0 25.0 17.0 20.0 21.0 25.0 53.0 33.0 732 1,160 135 1,870 114 321 60 9.00 2.60 8.00 1.90 7.30 5.40 20.0 30.0 25.0 52.0 16.0 59.0 90.0 11.5 59.0 24.0 11.0 54.0 19.0 16.0 86.0 13.0 14.0 15.0 18.0 34.0 23.0 560 896 1,390 246 6.20 1.40 9.70 5.40 7.00 1.20 8.20 9.80 9.40 5.50 3.40 70 14.0 22.0 19.0 36.0 45.0 56.0 40.0 16.0 39.0 12.0 10.0 61.0 11.0 11.0 21.0 16.0 429 676 974 186 75 5.20 0.96 7.10 4.40 5.40 0.90 6.70 8.80 7.70 8.30 7.60 4.60 8.90 2.60 8.50 12.0 18.0 16.0 28.0 40.0 42.0 33.0 13.0 34.0 50.0 18.0 12.0 373 580 800 160 80 4.00 9.40 0.59 5.30 3.70 4.40 0.70 5.50 6.00 5.50 7.00 6.10 3.90 7.10 1.80 6.20 9.60 14.0 14.0 21.0 34.0 32.0 26.0 10.0 30.0 40.0 14.0 323 492 625 139 indicates Index Station] indicates Index 85 3.20 7.80 0.35 4.00 3.00 3.50 0.53 7.70 4.40 3.70 3.60 5.30 4.60 3.20 5.50 1.20 4.10 7.30 11.0 11.0 15.0 30.0 24.0 21.0 27.0 33.0 12.0 277 409 440 121 bold 90 2.60 6.30 8.74 8.70 0.19 3.00 2.10 2.70 0.35 6.00 3.40 2.30 2.30 3.60 3.10 2.60 4.10 0.75 2.60 9.60 5.40 Streamflow equaled or exceeded at indicated percentage of time, in cubic feet per second 11.0 26.0 17.0 16.0 24.0 26.0 230 331 240 105 95 2.00 4.40 6.10 6.30 0.07 7.80 2.20 1.20 1.60 0.21 4.20 2.60 1.30 1.30 1.50 1.80 1.80 2.60 0.36 1.30 7.10 3.70 21.0 12.0 12.0 20.0 19.0 86.0 , square miles; 177 257 108 2 97 1.60 3.70 5.00 5.30 0.04 6.30 1.60 0.80 9.70 1.20 9.80 0.17 3.50 2.30 1.00 0.90 0.74 1.30 1.50 2.00 0.23 0.89 5.80 2.90 19.0 87.0 18.0 17.0 77.0 152 221 98 1.50 3.20 4.40 4.70 0.01 5.60 1.30 0.68 8.60 1.00 8.72 0.14 2.90 2.10 0.84 0.80 0.55 1.10 1.40 1.80 0.16 0.62 4.56 2.40 18.0 75.5 17.0 15.0 72.0 139 201 99 1.20 2.30 3.50 4.00 0.00 4.30 0.95 0.45 7.30 0.80 7.40 0.10 2.10 1.80 0.60 0.60 0.41 0.85 1.10 1.30 0.09 0.35 2.60 1.80 16.0 63.0 16.0 13.0 64.0 117 173 - ) 2 3.5 9.24 2.45 7.38 age (mi area 18 24.5 45.9 29.4 23.8 67.5 17.7 75.1 33.8 13.6 71 19.6 24.3 99.8 20.8 16.3 10.6 28.6 21 79.8 30 Drain 634 203 996 132 1,544 260

of 11 29 22 93 44 21 72 65 10 35 14 41 19 73 18 77 40 41 29 13 29 45 15 20 83 28 33 41 41 35 43 Years Years record

River name River River Naugatuck River Naugatuck Muddy River Mill River Blackberry River Housatonic River Salmon Creek Guinea Brook River Tenmile Housatonic River Aspetuck West Still River Marshepaug River Shepaug River River Nonewaug Pomperaug River Copper Mill Brook Housatonic River Branch West East Branch River Naugatuck Leadmine Brook Leadmine Brook River Naugatuck Branch Brook Hop Brook River Naugatuck Rooster River Mill River Sasco Brook Saugatuck River River Saugatuck River Norwalk USGS Flow-duration statistics for 91 streamgaging stations with 10 or more years of continuous record in Connecticut.—Continued station number 01196580 01196620 01198500 01199000 01199050 01199200 01200000 01200500 01201190 01201500 01201930 01203000 01203600 01204000 01204800 01205500 01205600 01205700 01206000 01206400 01206500 01206900 01208013 01208420 01208500 01208873 01208925 01208950 01208990 01209500 01209700

- Map 106 108 109 114 115 116 117 118 119 120 122 124 126 129 130 131 132 133 134 135 136 137 138 139 140 141 143 144 145 147 148 ence refer (fig. 1) number Table 2. Table mi year 2005; USGS, U.S. Geological Survey; [Statistics based on data through water 18 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 , square miles; 2 ------Number of days and dates zero flow 9/13/1957, 8/30–31/1965, 9/6–12/1965 8/22/68, 8/24–25/1968, 8/27/68, 9/14/1968–10/6/1968 (32) 7/21–21/1957, 8/3/1957, 8/7–24/1957, 9/10/1957, (37) 7/16/68, 7/21–23/1968, 8/13–16/1968, 8/19–20/1968, Low-flow frequency statistic

2 /s) 0.49 0.34 4.00 8.87 2.48 2.17 1.22 1.70 2.35 0.73 4.14 0.88 3 36.0 10.9 32.6 97.5 36.3 34.2 91.1 22.9 19.0 13.7 15.4 10.7 40.4 79.3 22.8 85.5 30Q (ft 229 4,070

2 /s) 0.21 7.13 0.15 2.25 6.81 1.30 1.29 6.50 9.26 0.53 9.30 0.83 1.28 0.46 2.84 0.76 3 25.8 21.7 72.6 26.0 22.0 70.9 17.5 13.7 31.7 59.5 14.2 60.1 7Q 174 (ft 3,210

10 /s) 0.04 3.71 0.02 0.93 8.94 4.50 0.50 7.66 7.96 0.58 2.12 4.91 0.20 5.64 0.29 6.41 0.47 0.24 0.93 0.45 3 13.9 44.7 15.4 13.6 37.3 92.2 18.3 16.6 36.0 7Q (ft 2,300 - ) 2 4.02 4.15 7.03 0.59 74.8 28.6 30 35.8 57.8 83.6 17 53 89.3 10.4 15.5 98.2 18.5 85 19.9 23.5 (mi 121 174 404 155 172 328 713 131 217 Drain age area 9,660 of 47 74 39 31 65 69 77 54 74 29 10 50 34 39 13 12 87 75 77 24 39 43 50 13 55 26 66 32 52 55 Years Years record Town North Stonington Mansfield Columbia Woodstock Ashford Windham Windham Canterbury Thompson Thompson Putnam Putnam Killingly Plainfield Brooklyn Griswold Griswold Norwich Suffield Suffield East Windsor East Windsor Barkhamsted Winchester Colebrook Barkhamsted Hartland Hartland New Hartford Burlington indicates Index Station] indicates Index bold River name Pendleton Brook Pendleton River Willimantic Hop River Brook Safford Mount Hope River Natchaug River River Shetucket Little River Quinebaug River Quinebaug River Little River Quinebaug River River Fivemile Moosup River Blackwell Brook River Pachaug Quinebaug River River Yantic Connecticut River Brook Stony Broad Brook Scantic River River Branch Farmington West Mad River Still River River Branch Farmington West River Hubbard Brook Valley Nepaug River Clear Brook USGS station number 01118300 01119500 01120000 01120500 01121000 01122000 01122500 01123000 01124000 01124151 01125490 01125500 01126000 01126500 01126600 01126950 01127000 01127500 01184000 01184100 01184490 01184500 01186000 01186100 01186500 01187000 01187300 01187400 01187800 01187850 Low-flow frequency statistics for 91 streamgaging stations with 10 or more years of record in Connecticut.—Continued

- 7 13 14 16 19 22 23 24 25 26 28 29 32 34 35 37 38 41 50 51 53 54 55 56 58 59 60 61 63 64 (fig. 1) /s, cubic feet per second; --, no data; erence number 3 Map ref Table 3. Table mi record through March 31, 2003. USGS, U.S. Geological Survey; on April 1 and ends March 31, flow which begins statistics are based on the climatic year, frequency [Low-flow ft Table 3 19 , square miles; 2 ------Number of days and dates zero flow (14) 10/8–15/1964, 9/28/1965, 10/3–5/1965, 9/5/1968 (4) 8/30–31/1944, 9/10–11/1944 Low-flow frequency statistic

2 /s) 1.48 7.78 0.91 6.08 0.70 3.94 0.64 3.94 0.64 7.14 3.74 5.15 0.44 2.30 2.79 1.22 0.46 0.52 8.78 2.81 3 21.4 13.8 23.1 20.3 27.7 46.0 27.7 46.0 24.7 17.5 62.0 30Q (ft 155 226 394 331

2 /s) 1.06 4.97 0.67 3.96 0.31 2.46 0.57 2.46 0.57 5.97 2.06 3.05 0.27 1.37 1.60 0.75 0.24 0.22 6.71 1.88 3 18.1 11.0 19.3 16.4 23.2 36.7 23.2 36.7 21.1 10.9 51.8 7Q 113 172 281 118 (ft

10 /s) 0.57 6.92 2.24 0.39 1.06 0.02 0.64 0.33 0.64 0.33 4.19 0.62 1.70 5.32 0.15 0.42 0.44 0.15 0.04 0.02 4.08 1.07 3 35.8 13.3 12.7 10.1 17.1 22.7 17.1 22.7 15.0 33.6 7Q 106 181 235 (ft - ) 2 4.1 2.65 5.54 0.94 0.94 2.62 5.68 6.55 45.8 39.5 67.4 14.6 14.6 39.9 26.8 72.5 73.4 26.8 72.5 73.4 24.3 46.5 29.8 34.7 20.1 22.3 11.2 17.4 18 (mi 360 378 577 590 100 115 Drain age area of 15 74 28 64 13 17 34 47* 13 13 13 45 13 50 25 74 16 50 25 74 16 10 10 25 19 77 16 29 48 24 24 20 18 75 11 Years Years record Town Avon Burlington Farmington Bristol Granby East Granby Simsbury Windsor Newington Newington Hartford West Hartford Bloomfield Hartford Hartford East Hartford Glastonbury Hartford Hartford East Hartford Glastonbury Glastonbury Berlin Middlefield Middlefield East Hampton East Haddam East Haddam Lyme Clinton Clinton Madison Southington Wallingford North Haven indicates Index Station] indicates Index bold River name Farmington River Farmington Burlington Brook River Farmington River Pequabuck East Branch Salmon Brook Salmon Brook River Farmington River Farmington Piper Brook Mill Brook Brook Trout River South Branch Park Brook Wash River North Branch Park River Park Hockanum River South Branch Salmon Brook River North Branch Park River Park Hockanum River South Branch Salmon Brook Roaring Brook Mattabesset River Coginchaug River Coginchaug River Salmon River Brook Hemlock Valley Eightmile River East Branch Eightmile River River Menunketesuck Indian River Neck River Quinnipiac River Quinnipiac River Muddy River USGS station number 01187980 01188000 01188090 01189000 01189390 01189500 01189995 01190000 01190100 01190200 01190300 01190500 01190600 01191000 01191500 01192500 01192600 01191000 01191500 01192500 01192600 01192650 01192700 01192883 01192890 01193500 01193800 01194000 01194500 01195000 01195100 01195200 01195490 01196500 01196580 Low-flow frequency statistics for 91 streamgaging stations with 10 or more years of record in Connecticut.—Continued

- 65 66 67 68 70 71 72 73 75 76 77 78 79 80 81 83 84 80 81 83 84 85 86 88 89 94 96 97 98 99 100 103 104 105 106 (fig. 1) /s, cubic feet per second; --, no data; erence number 3 Map ref Table 3. Table mi record through March 31, 2003. USGS, U.S. Geological Survey; on April 1 and ends March 31, flow which begins statistics are based on the climatic year, frequency [Low-flow ft 20 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

, square miles; 2 ------Number of days and dates zero flow (8) 1968, (7) 1970, (1) 1974, (24) 1980 (141 total)—(5) 1962, (30) 1964, (38) 1965, (28) 1966, (1) 10/12/1930 (1) 11/1/1979 Low-flow frequency statistic

2 /s) 6.93 9.79 9.05 0.19 2.54 2.05 2.80 0.35 6.11 3.73 2.26 2.18 3.88 2.61 3.07 4.50 0.76 2.44 5.43 3 35.8 26.0 16.5 15.7 25.4 26.5 10.7 30Q (ft 238 336 479 110

2 /s) 5.34 6.66 6.60 0.16 1.59 1.27 1.70 0.19 4.04 2.40 1.15 1.18 2.14 1.28 1.92 2.67 0.32 1.27 7.81 3.72 3 27.8 20.7 11.5 11.3 21.8 18.5 89.1 7Q 189 263 307 (ft

10 /s) 1.37 2.99 3.22 0.00 0.77 0.44 6.23 0.65 6.16 0.08 1.33 1.53 0.41 0.36 0.45 0.44 1.00 1.14 0.04 0.27 2.25 1.60 3 12.7 14.4 15.6 11.6 61.7 7Q 110 158 128 (ft - ) 2 3.5 9.24 2.45 7.38 24.5 45.9 29.4 23.8 67.5 17.7 75.1 33.8 13.6 71 19.6 24.3 99.8 20.8 16.3 10.6 28.6 21 79.8 30 (mi 634 203 996 132 260 Drain age area 1,544 of 29 22 93 44 21 72 65 10 35 14 41 19 73 18 77 40 41 29 13 29 45 15 20 83 28 33 41 41 35 43 Years Years record Town Hamden North Canaan Salisbury Salisbury Sharon NY Wingdale, Milford New New Milford Milford New Goshen Roxbury Woodbury Southbury Monroe Oxford Torrington Torrington Thomaston Harwinton Thomaston Thomaston Watertown Naugatuck Beacon Falls Trumbull Fairfield Fairfield Redding Westport Wilton indicates Index Station] indicates Index bold River name Mill River Blackberry River Housatonic River Salmon Creek Guinea Brook River Tenmile Housatonic River Aspetuck River West Still River Marshepaug River Shepaug River River Nonewaug Pomperaug River Copper Mill Brook Housatonic River River Branch Naugatuck West River East Branch Naugatuck River Naugatuck Leadmine Brook Leadmine Brook River Naugatuck Branch Brook Hop Brook River Naugatuck Rooster River Mill River Sasco Brook Saugatuck River River Saugatuck River Norwalk USGS station number 01196620 01198500 01199000 01199050 01199200 01200000 01200500 01201190 01201500 01201930 01203000 01203600 01204000 01204800 01205500 01205600 01205700 01206000 01206400 01206500 01206900 01208013 01208420 01208500 01208873 01208925 01208950 01208990 01209500 01209700 Low-flow frequency statistics for 91 streamgaging stations with 10 or more years of record in Connecticut.—Continued

- Post-reservoir record 1940–1987. Post-reservoir * 108 109 114 115 116 117 118 119 120 122 124 126 129 130 131 132 133 134 135 136 137 138 139 140 141 143 144 145 147 148 (fig. 1) /s, cubic feet per second; --, no data; erence number 3 Map ref Table 3. Table mi record through March 31, 2003. USGS, U.S. Geological Survey; on April 1 and ends March 31, flow which begins statistics are based on the climatic year, frequency [Low-flow ft Table 4 21 8.50 6.00 9.50 1.10 6.00 DEC 99.0 42.0 49.5 30.0 83.0 30.0 82.0 13.0 20.0 15.0 28.0 26.0 59.0 59.0 180 243 591 238 278 414 139 132 101 216 130 280 511 520 1,140 15,300 5.10 4.50 8.85 7.10 1.10 5.00 77.0 28.0 33.0 25.0 58.0 95.0 15.0 54.5 94.0 11.0 16.0 82.0 25.0 20.0 44.0 35.0 NOV 130 176 426 164 159 313 764 225 114 222 388 517 14,600 2.10 1.40 8.70 5.50 5.55 3.60 8.60 1.80 8.60 1.10 2.60 OCT 69.0 34.0 13.0 81.0 16.0 93.0 36.0 40.0 38.5 43.0 13.0 55.0 67.0 27.0 18.0 216 107 159 444 139 133 354 377 8,970 0.76 0.55 5.90 4.70 3.20 1.90 2.30 3.60 0.90 6.00 1.20 1.70 SEP 46.0 16.0 48.0 10.0 50.0 50.0 33.0 25.0 26.0 23.0 12.0 47.0 39.0 24.0 17.0 130 120 325 118 116 317 373 6,060 0.80 0.42 5.40 3.90 3.00 1.70 2.70 3.00 1.00 5.50 1.40 1.80 AUG 49.0 14.0 49.0 11.0 52.0 50.0 32.0 26.0 15.0 20.0 13.0 47.0 30.0 99 25.5 18.0 132 126 339 232 308 382 6,220 1.20 0.68 7.70 6.60 4.40 2.70 3.20 4.60 2.20 7.60 1.60 2.30 JUL 62.0 20.0 68.0 14.0 68.0 77.0 36.0 36.0 20.0 24.0 14.0 59.0 35.0 30.0 21.0 173 158 398 198 116 299 340 7,470 3.70 1.90 5.90 7.90 6.00 1.90 3.90 JUN 50.0 20.0 27.0 21.0 63.0 81.0 11.0 63.0 61.0 19.0 89.0 70.0 12.0 18.0 43.0 36.0 121 138 344 134 168 301 715 224 196 358 450 12,350 8.30 4.90 2.20 7.40 47.0 53.0 41.5 28.0 13.0 25.0 21.0 31.0 14.0 37.0 76.0 67.0 MAY 220 113 290 704 266 299 532 107 151 104 138 141 230 145 374 667 579 1,340 20,600 Monthly median flow, in cubic feet per second Monthly median flow, 8.95 2.20 APR 12.0 70.0 77.0 80.0 40.5 23.0 32.0 56.5 61.0 25.0 58.5 11.0 97.5 324 176 445 446 507 925 151 224 144 218 204 308 260 688 956 971 106 1,060 2,050 38,350 1.80 12.0 11.0 77.0 80.0 46.0 25.5 33.0 32.0 49.0 19.0 62.0 11.0 99.0 MAR 313 208 461 425 440 100 915 170 265 160 246 220 209 215 532 797 769 102 1,090 2,090 20,100 9.50 5.60 8.50 1.30 6.20 FEB 50.0 57.0 42.0 31.0 16.0 24.0 15.0 24.0 28.0 68.0 64.0 207 118 290 700 264 268 523 114 170 109 168 125 175 130 290 490 526 1,350 12,400 8.60 5.20 8.00 1.20 5.50 JAN 44.0 50.0 37.0 91.0 27.0 96.0 12.0 21.0 14.0 22.0 27.0 60.0 53.0 190 100 258 620 250 242 487 150 144 119 194 120 312 386 500 1,220 12,200 - ) 2 4.02 4.15 7.03 0.59 4.1 age (mi area 74.8 28.6 30 35.8 57.8 83.6 17 53 89.3 10.4 15.5 98.2 18.5 85 19.9 23.5 45.8 39.5 Drain 121 174 404 155 172 328 713 131 217 360 378 9,660 Town North Stonington Mansfield Columbia Woodstock Ashford Windham Windham Canterbury Thompson Thompson Putnam Putnam Killingly Plainfield Brooklyn Griswold Griswold Norwich Suffield Suffield East Windsor East Windsor Barkhamsted Winchester Colebrook Barkhamsted Hartland Hartland New Hartford Burlington Avon Burlington Farmington Bristol Granby indicates Index Station] indicates Index bold , square miles; 2 River name Pendleton Brook Pendleton River Willimantic Hop River Brook Safford Mount Hope River Natchaug River River Shetucket Little River Quinebaug River Quinebaug River Little River Quinebaug River River Fivemile Moosup River Blackwell Brook River Pachaug Quinebaug River River Yantic Connecticut River Brook Stony Broad Brook Scantic River River Farmington Branch West Mad River Still River River Farmington Branch West River Hubbard Brook Valley Nepaug River Clear Brook River Farmington Burlington Brook River Farmington River Pequabuck East Branch Salmon Brook USGS station number 01118300 01119500 01120000 01120500 01121000 01122000 01122500 01123000 01124000 01124151 01125490 01125500 01126000 01126500 01126600 01126950 01127000 01127500 01184000 01184100 01184490 01184500 01186000 01186100 01186500 01187000 01187300 01187400 01187800 01187850 01187980 01188000 01188090 01189000 01189390 Monthly median streamflows for 91 stations with 10 or more years of record in Connecticut.—Continued -

7 13 14 16 19 22 23 24 25 26 28 29 32 34 35 37 38 41 50 51 53 54 55 56 58 59 60 61 63 64 65 66 67 68 70 (fig. 1) erence number Map ref Table 4. Table mi [USGS, U.S. Geological Survey; 22 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 2.00 3.80 1.10 4.55 9.20 9.80 6.10 DEC 78.0 16.0 15.0 55.0 20.0 90.0 91.0 21.0 48.0 56.0 61.0 32.0 43.0 18.0 25.0 18.0 37.0 53.0 41.0 87.0 30.0 981 766 154 175 870 260 1,410 2.30 4.10 0.88 2.60 5.90 5.10 4.20 65.0 15.0 16.0 42.0 14.0 66.5 72.0 16.0 47.0 39.0 33.0 21.0 27.0 11.0 22.0 11.0 23.5 44.0 34.0 72.0 18.0 NOV 775 646 101 135 710 164 1,080 9.30 1.40 8.70 1.60 6.40 0.75 1.20 5.60 9.00 2.30 1.80 2.20 4.90 1.10 5.70 OCT 32.0 27.0 37.0 58.0 11.0 32.0 19.0 13.0 43.0 14.0 86.0 12.0 16.0 20.0 64.0 38.0 630 450 400 576 8.00 1.20 6.80 0.82 4.60 0.80 7.70 7.00 8.80 0.55 3.00 4.60 1.80 0.75 0.82 3.60 8.30 0.29 3.80 SEP 27.0 24.0 32.0 52.0 28.0 24.0 11.0 76.0 13.0 13.0 46.0 30.5 575 432 305 414 8.00 1.10 7.20 0.90 5.00 0.90 8.00 7.00 6.90 0.50 3.60 4.40 2.20 0.76 0.83 4.00 9.00 0.40 3.80 AUG 29.0 23.0 32.0 58.0 28.0 24.0 12.0 79.0 12.0 12.0 53.0 32.0 588 418 315 440 8.00 1.10 8.20 1.40 6.30 1.10 8.50 8.20 0.87 5.60 6.45 2.80 0.87 1.40 5.30 0.69 7.10 JUL 41.0 27.0 39.0 63.0 10.0 27.0 35.0 14.0 93.0 12.0 15.0 15.0 82.0 40.0 545 425 386 590 1.40 2.20 9.90 1.50 2.40 6.40 3.20 4.10 9.50 2.30 JUN 64.0 11.0 10.5 35.0 51.0 85.0 18.0 37.0 20.0 19.0 80.5 14.0 18.0 20.0 24.0 31.0 26.0 57.0 16.5 732 664 130 632 154 1,020 2.10 4.30 2.00 5.80 8.00 6.70 13.0 17.0 53.0 19.0 86.0 38.0 53.0 39.0 50.0 36.0 44.0 22.0 11.5 30.0 23.0 44.0 66.0 45.0 35.0 MAY 121 125 179 204 294 102 1,140 1,030 1,180 1,830 Monthly median flow, in cubic feet per second Monthly median flow, 2.85 7.20 2.40 6.90 APR 27.0 27.0 76.0 31.0 53.0 78.0 71.0 68.0 52.0 59.0 27.0 14.0 15.0 39.0 31.0 63.0 72.0 10.0 56.0 213 129 165 262 277 136 490 149 1,720 1,730 1,990 2,860 3.80 2.30 8.00 34.0 35.0 95.0 12.0 44.0 63.0 70.0 99.0 61.0 70.0 37.0 12.0 18.5 35.0 43.0 57.0 87.0 67.0 11.0 66.0 MAR 178 168 164 117 280 289 487 175 1,470 1,450 1,550 2,510 2.40 5.10 1.30 6.00 5.20 FEB 91.5 24.0 20.0 65.0 25.0 34.0 64.0 63.0 58.0 47.0 49.0 24.0 11.0 11.0 28.0 30.0 44.0 47.0 40.0 34.0 951 848 108 116 185 209 830 271 108 1,440 2.00 4.00 1.10 5.20 9.35 4.40 JAN 85.0 12.0 18.0 53.0 19.0 81.0 25.0 50.0 52.0 57.0 35.0 41.0 19.0 10.0 27.0 20.0 38.0 43.0 34.0 97.0 25.0 940 752 101 165 182 812 250 1,300 - ) 2 2.65 5.54 0.94 2.62 5.68 6.55 3.5 age (mi area 67.4 14.6 14.6 39.9 26.8 72.5 73.4 24.3 46.5 29.8 34.7 20.1 22.3 11.2 17.4 18 24.5 45.9 29.4 23.8 67.5 Drain 577 590 100 115 634 132 996 Town East Granby Simsbury Windsor Newington Newington Hartford West Hartford Bloomfield Hartford Hartford East Hartford Glastonbury Glastonbury Berlin Middlefield Middlefield East Hampton East Haddam East Haddam Lyme Clinton Clinton Madison Southington Wallingford North Haven Hamden North Canaan Salisbury Salisbury Sharon NY Wingdale, Milford New New Milford Milford New indicates Index Station] indicates Index bold , square miles; 2 River name Salmon Brook River Farmington River Farmington Piper Brook Mill Brook Brook Trout River South Branch Park Brook Wash River North Branch Park River Park Hockanum River South Branch Salmon Brook Roaring Brook Mattabesset River Coginchaug River Coginchaug River Salmon River Brook Hemlock Valley Eightmile River East Branch Eightmile River River Menunketesuck Indian River Neck River Quinnipiac River Quinnipiac River Muddy River Mill River Blackberry River Housatonic River Salmon Creek Guinea Brook River Tenmile Housatonic River Aspetuck River West Still River USGS station number 01189500 01189995 01190000 01190100 01190200 01190300 01190500 01190600 01191000 01191500 01192500 01192600 01192650 01192700 01192883 01192890 01193500 01193800 01194000 01194500 01195000 01195100 01195200 01195490 01196500 01196580 01196620 01198500 01199000 01199050 01199200 01200000 01200500 01201190 01201500 Monthly median streamflows for 91 stations with 10 or more years of record in Connecticut.—Continued -

71 72 73 75 76 77 78 79 80 81 83 84 85 86 88 89 94 96 97 98 99 100 103 104 105 106 108 109 114 115 116 117 118 119 120 (fig. 1) erence number Map ref Table 4. Table mi [USGS, U.S. Geological Survey; Table 4 23 3.90 DEC 25.0 27.0 45.0 22.0 96.0 29.0 33.0 28.0 28.0 12.0 27.0 12.0 41.0 75.0 49.0 169 112 159 410 2,360 2.70 9.00 7.90 21.0 15.0 75.0 35.0 16.0 61.0 28.0 23.5 20.0 19.0 17.0 25.0 43.0 31.0 NOV 100 120 310 1,720 5.40 0.90 8.10 8.00 9.30 4.70 3.40 9.80 OCT 10.0 36 34.0 14.0 32.0 11.0 59.0 16.0 11.0 18.0 13.0 892 165 5.20 4.20 0.47 8.70 4.70 3.95 4.10 7.20 4.70 3.90 6.60 1.45 3.70 7.20 SEP 26.5 20.0 29.0 35.5 13.0 646 132 3.00 3.80 0.50 8.40 5.10 3.30 3.10 6.70 4.75 4.10 6.90 1.30 4.40 9.00 AUG 23.0 22.0 30.0 34.0 12.0 684 132 4.10 4.70 0.64 5.60 5.90 5.30 8.50 6.00 4.40 7.70 1.60 6.70 JUL 42.0 29.0 11.0 36.0 42.0 16.0 11.0 920 151 7.25 9.00 1.60 9.60 7.50 4.60 JUN 56.0 21.0 60.0 16.0 16.0 75.0 12.0 12.0 15.0 15.0 31.0 21.0 103 243 1,620 4.00 14.0 22.0 48.0 20.0 32.0 41.0 23.0 27.0 12.0 32.0 11.0 34.0 46.0 MAY 230 114 123 159 476 107 2,890 Monthly median flow, in cubic feet per second Monthly median flow, 6.10 APR 28.0 36.0 94.5 38.0 51.0 66.0 35.0 37.0 16.0 52.5 16.0 51.0 73.0 404 176 212 262 730 188 4,480 6.90 26.0 43.0 76.0 33.0 65.0 70.0 42.0 37.0 14.0 46.0 17.0 54.0 77.0 MAR 369 188 199 260 731 230 4,030 4.60 FEB 15.0 25.0 41.0 19.0 28.0 35.0 23.5 30.0 12.0 34.0 13.0 40.0 53.0 196 115 100 152 423 102 2,420 4.00 JAN 15.0 25.0 37.0 17.0 27.0 34.0 22.0 25.5 12.0 29.0 11.0 36.0 45.0 185 105 100 145 395 100 2,350 - ) 2 9.24 2.45 7.38 age (mi area 17.7 75.1 33.8 13.6 71 19.6 24.3 99.8 20.8 16.3 10.6 28.6 21 79.8 30 Drain 132 260 1,544 Town Goshen Roxbury Woodbury Southbury Monroe Oxford Torrington Torrington Thomaston Harwinton Thomaston Thomaston Watertown Naugatuck Beacon Falls Trumbull Fairfield Fairfield Redding Westport Wilton indicates Index Station] indicates Index bold , square miles; 2 River name Marshepaug River Shepaug River River Nonewaug Pomperaug River Copper Mill Brook Housatonic River River Brook Naugatuck West River East Branch Naugatuck River Naugatuck Leadmine Brook Leadmine Brook River Naugatuck Branch Brook Hop Brook River Naugatuck Rooster River Mill River Sasco Brook Saugatuck River River Saugatuck River Norwalk USGS station number 01201930 01203000 01203600 01204000 01204800 01205500 01205600 01205700 01206000 01206400 01206500 01206900 01208013 01208420 01208500 01208873 01208925 01208950 01208990 01209500 01209700 Monthly median streamflows for 91 stations with 10 or more years of record in Connecticut.—Continued -

122 124 126 129 130 131 132 133 134 135 136 137 138 139 140 141 143 144 145 147 148 (fig. 1) erence number Map ref Table 4. Table mi [USGS, U.S. Geological Survey; 24 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Table 5. Descriptions of short-term stations in Connecticut used in correlation of daily mean base flows to estimate low-flow statistics.

[USGS, U.S. Geological Survey; mi2, square miles]

Number Map USGS Latitude Longitude of days Drainage reference Period of station (decimal (decimal River name Location with daily area number record number degrees) degrees) mean (mi2) (fig. 2) flow data 11 01119320 41.9343 -72.2609 Roaring Brook Near Stafford Springs, CT 1961–1966 1,887 14.6 57 01186400 41.9784 -73.0451 Sandy Brook State Highway 8 at 1967–1976 3,292 34.9 Robertsville, CT 62 01187680 41.8723 -72.9062 Cherry Brook Near Canton Center, CT 1966–1971 1,826 8.23 69 01189180 41.8745 -72.8612 Hop Brook West Simsbury, CT 1966–1971 1,826 1.38 74 01190055 41.8215 -72.5881 Podunk River Near South Windsor, CT 1975–1979 1,422 11.9

101 01195117 41.3854 -72.6126 Hammonasset River Near Madison, CT 1974–1977 1,240 18.1 102 01195146 41.3826 -72.5890 Pond Meadow Brook Near Killingworth, CT 1984–1993 3,287 5.92 111 01198800 41.9487 -73.3212 Hollenbeck River Huntsville, CT 1970–1974 1,461 18.1 112 01198860 41.9645 -73.3015 Deming Brook Near Huntsville, CT 1970–1975 1,602 1.08 113 01198870 41.9673 -73.3068 Ledgy Brook Near Huntsville, CT 1970–1974 1,461 0.66

128 01203805 41.5576 -73.2151 Weekeepeemee River Hotchkissville, CT 1978–1979, 1,495 26.8 2000–2005 146 01208999 41.2932 -73.3676 Little River Sanfordtown, CT 1965–1968 1,310 5.5 Table 6 25

Table 6. Descriptions of partial-record sites in Connecticut used in correlation of daily mean base flows to estimate flow duration, low-flow frequency, and August median statistics.

[USGS, U.S. Geological Survey; mi2, square miles]

Map Number refer- USGS Latitude Longitude of base- Drainage ence station (decimal (decimal River name Location Period of record flow area number number degrees) degrees) measure- (mi2) (fig. 2) ments 8 01118350 41.4548 -71.8140 Green Fall River Clarks Falls, CT 1960–1973 24 19.8 9 01118750 41.3890 -71.9859 Haleys Brook Near Old Mystic, CT 1962–1978 33 4.37 10 01119255 42.0232 -72.2476 Delphi Brook Near Staffordville, CT 1962–1975 29 2.59 12 01119360 41.8715 -72.2915 Conat Brook Willington, CT 1963–1978 30 2.40 15 01120200 41.7070 -72.2473 Tenmile River Near Willimantic, CT 1962–1973 23 16.3

17 01120700 41.8793 -72.0998 Bigelow Brook Phoenixville, CT 1960–1973 18 22.0 18 01120920 41.9201 -72.1792 Mount Hope River Westford, CT 1962–1973 21 3.16 20 01121300 41.8723 -72.2415 Fenton River East Willington, CT 1960–1975 32 11.4 21 01121350 41.8145 -72.2254 Fenton River Gurleyville, CT 1962–1973 20 24.0 27 01125300 41.9909 -71.9970 English Neighborhood Near Woodstock, CT 1961–1978 36 4.66 Brook

30 01125600 41.8743 -72.0092 Mashamoquet Brook Abington, CT 1961–1975 39 11.1 31 01125900 41.9090 -71.8192 Cady Brook East Putnam, CT 1961–1979 28 8.29 36 01126700 41.4050 -71.5842 Kitt Brook Near Canterbury, CT 1961–1975 24 11.1 39 01127100 41.5540 -71.9704 Broad Brook Near Preston City, CT 1960–1965, 20 12.5 1967–1975 40 01127400 41.5709 -72.1331 Susquetonscut Brook Yantic, CT 1960–1975 30 15.7

42 01127700 41.5009 -72.1159 Trading Cove Brook Near Thamesville, CT 1960–1973 29 8.46 43 01127790 41.2200 -72.1218 Latmier Brook East Lyme, CT 1962–1973 15 18.5 44 01127800 41.3570 -72.2606 Fourmile River Near East Lyme, CT 1960–1979 38 4.30 49 01183990 42.0068 -72.5534 Jawbuck Brook Near Hazardville, CT 1963–1976 24 2.16 52 01184300 41.9918 -72.4343 Gillette Brook Somers, CT 1960–1980 56 3.64

82 01191900 41.9062 -72.4037 Charter Brook Near Crystal Lake, CT 1960–1978 35 8.51 87 01192800 41.4523 -72.7018 Parmalee Brook Near Durham, CT 1960–1978 28 2.79 90 01193120 41.4793 -72.5573 Ponset Brook Near Higganum, CT 1962–1977 28 5.72 91 01193130 41.4740 -72.5965 Candlewood Hill Brook Near Higganum, CT 1960–1973 24 3.84 92 01193210 41.6395 -72.3426 Raymond Brook Near Amston, CT 1960–1964, 19 3.52 1967–1973

93 01193300 41.6962 -72.4556 Blackledge River Near Gilead, CT 1960–1975, 1978 27 6.75 95 01193600 41.5551 -72.4523 Flat Brook Near East Hampton, CT 1960–1964, 21 2.31 1967–1973 107 01196600 41.4598 -72.9179 Willow Brook Near Cheshire, CT 1986–2005 73 9.34 110 01198700 41.5535 -73.1649 Brown Brook Lower City, CT 1960–1968 24 5.56 121 01201890 41.4562 -73.3348 Pond Brook Near Hawleyville, CT 1962–1975 28 11.9

123 01202700 41.7432 -73.2201 Butternut Brook Near Litchfield, CT 1960–1979 37 2.42 125 01203100 41.5276 -73.3085 Jacks Brook Near Roxbury Falls, CT 1960–1975, 1978 34 7.90 127 01203700 41.6273 -73.2257 Wood Creek Near Bethlehem, CT 1960–1966, 31 3.39 1968–1979 142 01208900 41.2879 -73.2921 Patterson Brook Near Easton, CT 1960–1978 33 1.21 26 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

- -

770 704 635 492 563 683 530 527 350 955 727 934 965 958 793 879 939 889 836 627 771 662 653 533 671 (ft)

tion mum 1,204 1,304 1,294 1,253 1,204 basin Maxi eleva

- - 69 96 344 356 283 254 114 123 156 771 596 510 242 535 447 672 320 440 274 236 385 270 483 419 412 141 173 151 117 113 (ft) tion , square miles; mum Mini basin 2 eleva

- 532 493 454 327 314 389 339 271 239 908 652 493 747 799 914 617 768 566 508 674 528 686 647 494 478 389 343 290 368 (ft) tion 1,005 basin Mean eleva - 0.0 0.0 0.0 0.0 0.0 2.9 4.8 3.2 3.3 0.0 1.6 2.2 2.6 0.0 0.9 2.8 1.5 1.7 1.9 2.1 4.2 1.4 2.6 0.0 0.0 3.6 3.6 5.0 2.7 4.4 (per cent) Swamp - 0.0 0.0 0.0 0.0 0.0 0.4 0.0 1.5 0.0 0.0 2.0 0.0 0.9 0.0 3.0 8.2 1.7 1.4 0.6 1.6 1.1 1.6 0.9 0.1 0.0 0.0 0.5 5.8 0.0 0.0 (per cent) Water Water 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.2 0.0 0.0 0.0 2.5 0.0 1.9 0.0 0.0 Fines gravel sand and (percent) overlying - - Al 0.0 0.0 0.0 0.0 0.0 0.0 1.5 0.5 1.2 0.0 1.6 0.0 1.8 0.0 2.5 0.0 0.7 0.7 1.0 2.3 0.0 2.1 0.5 0.0 0.0 0.0 0.0 0.1 0.0 1.6 (per cent) luvium - 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.5 0.0 0.8 0.0 0.0 (per cent) Fines 8.9 0.0 0.0 3.8 0.0 6.0 5.4 3.4 3.8 6.6 1.1 8.2 6.3 4.7 11.6 25.6 42.7 51.9 26.8 30.9 10.9 10.7 17.0 15.8 12.3 29.2 21.3 23.5 13.8 15.1 and (sand Coarse gravel) deposits (percent)

- 1 0.0 0.0 0.0 0.0 0.0 6.0 1.5 4.6 8.9 1.6 2.2 5.2 9.4 9.1 6.4 1.0 0.0 till (per cent) 11.8 11.3 53.1 12.2 14.9 35.9 28.5 28.5 26.1 24.0 12.1 13.4 18.0 Thick glacial

- till 88.4 74.4 57.3 48.1 73.2 59.8 81.3 79.6 77.8 88.2 93.0 78.5 79.0 46.9 82.4 71.3 77.8 82.9 80.9 71.8 57.6 52.9 59.3 92.6 70.8 61.6 50.6 50.7 70.0 60.8 (per cent) Glacial

) 2 2.80 8.39 7.30 9.78 4.00 4.41 2.57 2.13 4.17 3.44 4.46 8.29 4.22 (mi area DEM 16.32 35.31 19.25 15.13 16.29 26.90 29.00 10.93 24.24 30.06 36.11 11.02 17.11 10.66 52.92 12.30 15.27 drainage

- ) 2 2.8 8.39 7.3 9.78 4.02 4.37 2.59 2.40 4.15 3.16 4.66 8.29 4.22 age (mi area 16.3 35.3 19.8 14.6 16.3 22.0 28.6 11.4 24.0 30.0 35.8 11.1 17.0 11.1 53.0 12.5 15.7 Drain River name Nipmuc River Branch River Nooseneck River Carr River River Beaver River Wood Brook Pendleton River Green Fall Brook Haleys Delphi Brook Roaring Brook Conat Brook River Tenmile Brook Safford Brook Bigelow Mount Hope River Mount Hope River Fenton River Fenton River Little River English Neighborhood Brook Little River Mashamoquet Brook Cady Brook Brook Bucks Horn Blackwell Brook Kitt Brook River Pachaug Broad Brook Susquetonscut Brook type Station I (RI) I (RI) I (RI) I (RI) I (RI) I (RI) I (CT) P P P S P P I (CT) P P I (CT) P P I (CT) P I (CT) P P I (RI) I (CT) P I (CT) P P

USGS station number 01111300 01115100 01115630 01115770 01117468 01117800 01118300 01118350 01118750 01119255 01119320 01119360 01120200 01120500 01120700 01120920 01121000 01121300 01121350 01123000 01125300 01125490 01125600 01125900 01126200 01126600 01126700 01126950 01127100 01127400 indicates Index Station] indicates Index Basin characteristics for the index stations, short-term and partial-record sites.—Continued

bold - 1 2 3 4 5 6 7 8 9 10 11 12 15 16 17 18 19 20 21 24 27 28 30 31 33 35 36 37 39 40 Map ence refer (fig. 2) number Table 7. Table (1998). Station type, from Soller and Parkard from Stone and others (1992) geologic characteristics for basins outside of Connecticut derived [Geologic characteristics for basins in Connecticut derived mi partial-record site; S, short-term station; USGS, U.S. Geological Survey; station in Massachusetts; P, station in Connecticut; I (MA), index station in Rhode Island; I (CT), index I (RI), index ft, feet; Table 7 27

- -

518 605 427 826 236 930 999 424 753 733 681 723 783 897 897 612 628 638 644 (ft)

tion mum 1,093 1,334 2,232 1,114 3,134 1,644 1,490 1,209 1,187 1,170 1,050 basin Maxi eleva

- - 49 27 79 44 61 73 38 71 208 649 637 393 136 279 569 595 544 441 509 531 736 328 544 239 208 141 204 389 476 103 (ft) tion , square miles; mum Mini basin 2 eleva

- 295 278 216 407 872 193 676 896 843 733 925 699 169 722 457 396 490 480 582 657 472 402 353 407 365 (ft) tion 1,074 1,424 1,360 1,286 1,099 basin Mean eleva - 3.3 1.1 1.1 0.0 0.0 0.0 0.0 0.0 2.8 2.2 0.0 0.0 0.0 1.8 0.0 0.0 0.0 1.0 1.6 0.0 0.0 0.9 0.0 1.3 0.7 1.9 0.0 0.0 1.3 0.3 (per cent) Swamp - 1.1 3.0 0.0 0.0 0.0 0.0 0.0 0.0 1.4 1.0 0.0 0.0 0.0 0.5 0.0 0.0 0.0 0.5 0.0 0.0 0.0 0.0 0.0 1.3 0.7 1.3 0.0 0.0 1.9 1.1 (per cent) Water Water 2.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.6 0.0 0.0 0.0 5.7 0.0 0.0 0.0 0.8 0.0 0.0 0.0 0.0 95.1 Fines gravel sand and (percent) overlying - - Al 0.6 1.7 0.0 0.0 0.0 0.0 0.0 4.9 1.4 1.2 0.0 0.0 3.9 5.2 0.0 3.0 0.0 2.5 1.6 0.0 6.3 0.0 0.0 1.3 0.0 2.1 0.0 2.3 1.0 2.2 (per cent) luvium - 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 (per cent) 20.3 Fines 9.8 7.6 2.8 0.0 2.1 0.0 6.7 1.6 0.0 0.1 0.0 6.8 8.1 7.8 6.3 5.1 0.0 5.6 7.8 0.0 7.2 7.1 6.5 12.7 33.3 44.6 25.2 39.6 64.8 15.7 and (sand Coarse gravel) deposits (percent)

- 1 5.7 6.5 8.7 0.0 0.0 0.0 0.0 0.0 8.1 4.3 0.0 0.0 0.0 0.0 0.0 3.3 9.0 6.5 0.6 7.1 till (per cent) 15.3 18.6 40.6 10.1 13.9 23.2 14.1 10.9 18.5 11.7 Thick glacial

- 0.0 till 77.2 75.1 82.6 66.7 97.2 97.9 79.5 89.7 99.9 80.8 67.0 55.4 31.1 91.9 24.4 75.0 35.2 84.2 68.7 88.4 72.8 78.8 75.0 81.5 78.9 88.2 82.8 (per cent) 100.0 100.0 Glacial

) 2 8.91 4.38 5.68 9.25 1.39 2.04 3.66 7.39 8.14 0.56 3.99 1.41 8.47 0.95 2.90 5.63 3.71 3.66 6.78 2.43 2.79 (mi area DEM 17.43 93.99 35.56 20.66 23.77 11.88 20.20 22.45 101.64 drainage

- ) 2 8.46 4.30 5.68 9.25 1.39 2.16 3.64 7.03 8.23 0.59 4.10 1.38 8.51 0.94 2.79 5.72 3.84 3.52 6.75 2.31 2.62 age (mi area 18.5 94.0 34.9 19.9 23.5 11.9 20.1 22.3 Drain 100 River name Trading Cove Brook Cove Trading Latimer Brook River Fourmile Bassett Brook River Sevenmile Brook Skyes River Branch Westfield West Brook Jawbuck Gillette Brook Sandy Brook River Hubbard Brook Valley Cherry Brook Nepaug River Clear Brook Burlington Brook Hop Brook Podunk River Charter Brook South Branch Salmon Brook Brook Parmalee Ponset Brook Hill Brook Candlewood Raymond Brook Blackledge River Salmon Brook Flat Brook Brook Hemlock Valley Eightmile River East Branch Eightmile River type Station P P P I (MA) I (MA) I (MA) I (MA) P P S I (CT) I (CT) S I (CT) I (CT) I (CT) S S P I (CT) P P P P P I (CT) P I (CT) I (CT) I (CT)

USGS station number 01127700 01127790 01127800 01171800 01175670 01180000 01181000 01183990 01184300 01186400 01187300 01187400 01187680 01187800 01187850 01188000 01189180 01190055 01191900 01192600 01192800 01193120 01193130 01193210 01193300 01193500 01193600 01193800 01194000 01194500 indicates Index Station] indicates Index Basin characteristics for the index stations, short-term and partial-record sites.—Continued

bold - 42 43 44 45 46 47 48 49 52 57 60 61 62 63 64 66 69 74 82 84 87 90 91 92 93 94 95 96 97 98 Map ence refer (fig. 2) number Table 7. Table (1998). Station type, from Soller and Parkard from Stone and others (1992) geologic characteristics for basins outside of Connecticut derived [Geologic characteristics for basins in Connecticut derived mi partial-record site; S, short-term station; USGS, U.S. Geological Survey; station in Massachusetts; P, station in Connecticut; I (MA), index station in Rhode Island; I (CT), index I (RI), index ft, feet; 28 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

- -

495 715 662 420 873 825 663 528 398 851 (ft)

tion mum 1,746 1,747 1,960 1,949 1,550 1,417 1,634 1,290 1,044 1,133 1,138 1,187 1,105 1,002 basin Maxi eleva

- - 5 47 60 248 308 113 771 658 797 773 268 248 914 291 559 236 336 535 492 358 298 376 (ft) tion , square miles; mum Mini basin 2 eleva 1,141 1,085

- 236 427 488 167 346 786 513 686 905 741 490 900 760 430 230 574 632 (ft) tion 1,412 1,188 1,498 1,494 1,292 1,337 1,122 basin Mean eleva - 2.1 4.0 3.1 1.9 3.5 2.6 1.6 0.0 0.0 1.8 1.8 2.0 3.3 0.0 2.4 4.0 0.7 5.0 2.7 2.3 0.0 3.9 0.0 (per 15.3 cent) Swamp - 0.0 0.3 1.0 0.0 0.0 1.8 0.6 0.0 0.0 0.0 1.6 2.0 9.9 0.0 0.0 0.0 0.2 0.0 0.9 1.3 0.0 0.0 1.2 1.1 (per cent) Water Water 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fines gravel sand and (percent) overlying - - Al 0.0 0.0 0.0 1.0 0.0 0.0 3.6 0.0 0.0 0.0 1.6 2.0 2.0 4.2 0.6 1.4 2.7 0.0 1.0 0.5 0.0 0.8 1.2 0.0 (per cent) luvium - 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 (per cent) Fines 8.7 8.1 7.0 2.6 3.9 0.0 0.0 1.8 2.6 9.5 0.6 2.1 3.7 2.9 3.2 4.0 4.5 4.0 1.6 2.2 21.6 38.7 13.0 10.5 and (sand Coarse gravel) deposits (percent)

- 1 1.4 0.0 0.0 3.6 0.0 0.0 0.0 7.6 8.1 4.2 till (per cent) 11.2 15.2 10.8 19.9 28.1 37.8 18.2 20.5 12.0 41.0 33.5 30.2 37.9 23.4 Thick glacial

- till 77.9 86.2 73.6 64.8 57.8 93.0 86.7 96.5 81.1 64.6 56.1 55.9 75.0 71.2 81.2 41.0 57.9 61.2 72.6 59.7 79.0 73.3 (per cent) 100.0 100.0 Glacial

) 2 5.73 6.24 6.59 9.40 5.55 1.10 0.70 3.48 9.50 2.43 7.82 3.40 2.45 1.20 7.43 5.52 (mi area DEM 18.30 19.02 23.85 11.86 27.06 19.76 24.44 20.67 drainage

- ) 2 5.68 5.92 6.55 9.34 5.56 1.08 0.66 3.5 9.24 2.42 7.90 3.39 2.45 1.21 7.38 5.5 age (mi area 18.1 18.1 23.8 11.9 26.8 19.6 24.3 21.0 Drain River name Indian River Hammonasset River Brook Pond Meadow Neck River Brook Willow Brook Brown Hollenbeck River Deming Brook Ledgy Brook Guinea Brook Aspetuck River West Pond Brook Marshepaug River Butternut Brook Jacks Brook Creek Wood River Weekeepeemee Copper Mill Brook Leadmine Brook Leadmine Brook Brook Patterson Sasco Brook Saugatuck River Little River type Station I (CT) S S I (CT) P P S S S I (CT) I (CT) P I (CT) P P P S I (CT) I (CT) I (CT) P I (CT) I (CT) S

USGS station number 01195100 01195117 01195146 01195200 01196600 01198700 01198800 01198860 01198870 01199200 01201190 01201890 01201930 01202700 01203100 01203700 01203805 01204800 01206400 01206500 01208900 01208950 01208990 01208999 indicates Index Station] indicates Index Basin characteristics for the index stations, short-term and partial-record sites.—Continued

bold - Thick glacial till is defined as greater than 10-ft thick. Thick glacial till is defined 1 Map 100 101 102 103 107 110 111 112 113 116 119 121 122 123 125 127 128 130 135 135 142 144 145 146 ence refer (fig. 2) number Table 7. Table (1998). Station type, from Soller and Parkard from Stone and others (1992) geologic characteristics for basins outside of Connecticut derived [Geologic characteristics for basins in Connecticut derived mi partial-record site; S, short-term station; USGS, U.S. Geological Survey; station in Massachusetts; P, station in Connecticut; I (MA), index station in Rhode Island; I (CT), index I (RI), index ft, feet; Table 8 29

Table 8. Summary of low-flow correlation coefficients at short-term stations and partial-record sites in Connecticut.

[Index Station used in MOVE.3 equation shown in bold; USGS, U.S. Geological Survey; number in parentheses is map reference number on figure 2]

Number of Number of Nearby index Nearby index USGS station streamflow USGS station streamflow stations used stations used number measurements Correlation number measurements Correlation in relation in relation (map reference or daily mean coefficient (map reference or daily mean coefficient (map reference (map reference number) streamflows number) streamflows number) number) used in relation used in relation Low-flow partial-record stations Low-flow partial-record stations—Continued 01118350 (8) 01118300 (7) 24 0.91 01121300 (20) 01118300 (7) 29 0.90 01120500 (16) 24 0.90 01120500 (16) 29 0.90 01121000 (19) 24 0.87 01121000 (19) 29 0.97 01123000 (24) 24 0.88 01123000 (24) 29 0.93 01115630 (3) 16 0.87 01115770 (4) 16 0.87 01121350 (21) 01118300 (7) 20 0.70 01117800 (6) 16 0.91 01120500 (16) 20 0.75 01121000 (19) 20 0.78 01118750 (9) 01118300 (7) 22 0.95 01123000 (24) 20 0.80 01123000 (24) 22 0.73 01193800 (96) 20 0.75 01194500 (98) 22 0.72 01194500 (98) 20 0.73 01115630 (3) 16 0.66 01115770 (4) 16 0.57 01125300 (27) 01120500 (16) 29 0.92 01121000 (19) 29 0.92 01119255 (10) 01118300 (7) 23 0.82 01123000 (24) 29 0.85 01120500 (16) 23 0.90 01187800 (63) 29 0.90 01121000 (19) 23 0.94 01195200 (103) 29 0.86 01126600 (35) 20 0.90 01192600 (84) 23 0.58 01125600 (30) 01120500 (16) 26 0.94 01193800 (96) 23 0.92 01121000 (19) 26 0.95 01171800 (45) 20 0.91 01123000 (24) 26 0.91 01194500 (98) 26 0.91 01119360 (12) 01118300 (7) 24 0.73 01195200 (103) 26 0.90 01120500 (16) 24 0.75 01188000 (66) 24 0.77 01125900 (31) 01118300 (7) 20 0.86 01192600 (84) 24 0.54 01120500 (16) 20 0.89 01193800 (96) 24 0.88 01121000 (19) 20 0.89 01123000 (24) 20 0.76 01120200 (15) 01118300 (7) 23 0.83 01111300 (1) 15 0.84 01120500 (16) 23 0.78 01121000 (19) 23 0.93 01126700 (36) 01118300 (7) 22 0.92 01126600 (35) 13 0.96 01120500 (16) 22 0.86 01123000 (24) 23 0.95 01121000 (19) 22 0.97 01193800 (96) 23 0.92 01123000 (24) 22 0.96 01194000 (97) 15 0.96 01194500 (98) 22 0.97 01115630 (3) 15 0.96 01120700 (17) 01111300 (1) 10 0.85 01115770 (4) 15 0.92 01120500 (16) 18 0.60 01117800 (6) 15 0.96 01121000 (19) 18 0.87 01123000 (24) 18 0.84 01127100 (39) 01115630 (3) 12 0.97 01125490 (28) 16 0.85 01115770 (4) 12 0.90 01126600 (35) 10 0.82 01118300 (7) 19 0.91 01194500 (98) 18 0.72 01120500 (16) 19 0.84 01121000 (19) 19 0.87 01120920 (18) 01121000 (19) 21 0.98 01123000 (24) 19 0.79 01194500 (98) 19 0.88 30 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Table 8. Summary of low-flow correlation coefficients at short-term stations and partial-record sites in Connecticut.—Continued

[Index Station used in MOVE.3 equation shown in bold; USGS, U.S. Geological Survey; number in parentheses is map reference number on figure 2]

01127700 (42) 01118300 (7) 25 0.81 01193120 (90) 01118300 (7) 24 0.96 01120500 (16) 25 0.85 01120500 (16) 24 0.88 01121000 (19) 25 0.85 01193800 (96) 23 0.95 01123000 (24) 25 0.87 01194000 (97) 14 0.97 01194500 (98) 25 0.85 01194500 (98) 24 0.97 01195200 (103) 24 0.94 01127790 (43) 01118300 (7) 14 0.44 01121000 (19) 14 0.62 01193130 (91) 01118300 (7) 24 0.90 01123000 (24) 14 0.73 01120500 (16) 24 0.84 01193500 (94) 14 0.59 01193800 (96) 24 0.92 01193800 (96) 14 0.80 01194000 (97) 18 0.95 01194500 (98) 14 0.54 01194500 (98) 24 0.92 01195200 (103) 14 0.68 01195200 (103) 21 0.93 01204800 (130) 24 0.84 01127800 (44) 01118300 (7) 30 0.86 01194000 (97) 17 0.92 01193210 (92) 01118300 (7) 19 0.89 01194500 (98) 30 0.91 01120500 (16) 19 0.88 01195200 (103) 27 0.86 01121000 (19) 19 0.89 01123000 (24) 19 0.90 01183990 (49) 01120500 (16) 24 0.79 01126600 (35) 9 0.70 01187400 (61) 24 0.77 01193800 (96) 19 0.88 01192600 (84) 24 0.85 01195200 (103) 16 0.91 01171800 (45) 22 0.91 01175670 (46) 24 0.86 01193300 (93) 01118300 (7) 19 0.86 01120500 (16) 19 0.77 01184300 (52) 01120500 (16) 39 0.88 01121000 (19) 19 0.87 01171800 (45) 39 0.65 01123000 (24) 19 0.81 01175670 (46) 39 0.86 01193800 (96) 19 0.85 01187300 (60) 39 0.77 01194000 (97) 11 0.89 01180000 (47) 39 0.74 01194500 (98) 19 0.83 01188000 (66) 39 0.83 01195200 (103) 16 0.86

01191900 (82) 01120500 (16) 31 0.86 01193600 (95) 01118300 (7) 21 0.83 01121000 (19) 31 0.84 01121000 (19) 21 0.89 01123000 (24) 31 0.89 01193800 (96) 21 0.93 01187300 (60) 31 0.81 01194000 (97) 13 0.93 01188000 (66) 31 0.88 01195200 (103) 18 0.88 01194500 (98) 31 0.84 Table 8 31

Table 8. Summary of low-flow correlation coefficients at short-term stations and partial-record sites in Connecticut.—Continued

[Index Station used in MOVE.3 equation shown in bold; USGS, U.S. Geological Survey; number in parentheses is map reference number on figure 2]

01203100 (125) 01187300 (60) 28 0.88 01195146 (102) 01118300 (7) 35 0.70 01188000 (66) 28 0.85 01195100 (100) 35 0.86 01201190 (119) 14 0.93 01204800 (130) 26 0.89 01198800 (111) 01187300 (60) 23 0.79 01208990 (145) 17 0.93 01201190 (119) 11 0.95 01201930 (122) 23 0.68 01203700 (127) 01187300 (60) 26 0.80 01206400 (135) 17 0.45 01188000 (66) 26 0.90 01208990 (145) 23 0.80 01199200 (116) 26 0.85 01204800 (130) 24 0.81 01198860 (112) No index stations for correlation

01208900 (142) 0195200 (103) 24 0.75 01198870 (113) No index stations for correlation 01204800 (130) 24 0.67 01208950 (144) 16 0.59 01203805 (128) 01187300 (60) 27 0.67 01188000 (66) 27 0.66 Short-term continuous stations 01208950 (144) 27 0.60 01119320 (11) 01118300 (7) 35 0.85 01208990 (145) 27 0.65 01120500 (16) 35 0.78 01121000 (19) 35 0.87 01208999 (145) 01188000 (66) 26 0.92 01123000 (24) 35 0.84 01204800 (130) 26 0.87 01186400 (57) 01187300 (60) 53 0.96 01208950 (144) 26 0.83 01208990 (145) 26 0.89 32 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

------Index station used in relation 01118300 01118300 01120500 01193800 01121000 01121000 01121000 01121000 01120500 01121000 01120500 01123000 01118300 01123000 01194500 01194500 01171800 01120500 01123000 01193800 01194500 01193800 01195200 01121000 01193800 01208990 01206400 01204800 01199200 01208990 01188000 - - Cor 0.91 0.95 0.90 0.88 0.93 0.87 0.98 0.97 0.92 0.95 0.84 0.96 0.91 0.96 0.85 0.91 0.91 0.89 0.89 0.88 0.97 0.89 0.91 0.87 0.93 0.84 0.92 0.93 0.91 0.93 0.90 cient 0.80 0.80 0.80 coeffi relation ≤ ≤ ≤

/s 3 ------5.28 0.8 0.68 0.86 1.82 3.16 0.55 2.67 0.27 1.68 1.92 1.38 2.84 1.86 2.02 0.91 0.80 0.33 1.30 0.51 1.26 0.40 0.23 0.91 0.3 6.29 0.70 1.94 0.22 1.91 0.68 flow, flow, in ft August median ------85 5.79 0.91 0.78 0.92 2.03 3.42 0.61 2.95 0.34 1.88 2.12 1.38 3.11 1.86 2.21 1.03 0.80 0.41 1.30 0.55 1.40 0.45 0.27 1.02 0.33 6.09 0.79 2.06 0.22 1.82 0.62 ------90 4.14 0.57 0.55 0.73 1.36 2.57 0.42 2.05 0.19 1.24 1.64 0.96 2.23 1.35 1.63 0.68 0.66 0.24 0.95 0.42 0.98 0.30 0.17 0.68 0.23 4.94 0.49 1.38 0.13 1.33 0.39 /s 3 ------95 2.61 0.30 0.33 0.60 0.82 1.77 0.26 1.28 0.09 0.73 1.13 0.65 1.42 0.97 1.01 0.34 0.48 0.11 0.68 0.34 0.56 0.21 0.09 0.40 0.17 3.60 0.27 0.85 0.06 0.82 0.25 ------97 1.81 0.18 0.25 0.52 0.61 1.44 0.19 0.99 0.06 0.54 0.91 0.50 0.99 0.77 0.78 0.24 0.42 0.07 0.54 0.29 0.42 0.17 0.05 0.30 0.13 3.03 0.21 0.69 0.03 0.63 0.20 /s 3 Flow durations, in ft ------98 1.35 0.12 0.15 0.48 0.48 1.21 0.15 0.79 0.03 0.42 0.64 0.42 0.74 0.66 0.64 0.18 0.40 0.03 0.47 0.26 0.33 0.14 0.04 0.23 0.12 2.57 0.17 0.58 0.01 0.49 0.16 ------99 0.92 0.07 0.08 0.45 0.35 0.96 0.11 0.88 0.01 0.30 0.40 0.34 0.51 0.56 0.41 0.10 0.35 0.01 0.40 0.25 0.20 0.13 0.02 0.17 0.10 1.97 0.12 0.42 0.00 0.33 0.12 Streamflow, in ft Streamflow, ] /s 3 ------3.70 0.49 0.59 0.78 1.33 2.52 0.41 2.00 0.21 1.21 1.71 0.96 2.00 1.35 1.38 0.54 0.66 0.26 0.95 0.46 0.81 0.34 0.15 0.66 0.26 4.80 0.48 1.38 0.13 1.27 0.49 2-year 30-day, 30-day, ------2.02 0.21 0.33 0.55 0.73 1.64 0.23 1.16 0.09 0.65 1.13 0.61 1.10 0.91 0.87 0.28 0.52 0.11 0.64 0.31 0.47 0.18 0.07 0.36 0.15 3.56 0.24 0.77 0.11 0.81 0.27 7-day, 7-day, 2-year ≤, less than or equal to ------0.60 0.04 0.08 0.36 0.29 0.84 0.10 0.50 0.01 0.25 0.41 0.30 0.33 0.49 0.30 0.06 0.29 0.01 0.35 0.20 0.14 0.09 0.01 0.14 0.08 1.76 0.08 0.34 0.00 0.28 0.09 Low-flow frequency, in ft Low-flow frequency, 7-day, 7-day, 10-year River name /s, cubic feet per second; --, not computed; 3 Green Fall River Green Fall Brook Haleys Delphi Brook Conat Brook River Tenmile Brook Bigelow Mount Hope River Fenton River Fenton River English Neighborhood Brook Mashamoquet Brook Cady Brook Kitt Brook Broad Brook Susquetonscut Brook Brook Cove Trading Latimer Brook River Fourmile Brook Jawbuck Gillette Brook Charter Brook Brook Parmalee Ponset Brook Hill Brook Candlewood Raymond Brook Blackledge River Flat Brook Brook Willow Brook Brown Pond Brook Butternut Brook Jacks Brook Creek Wood Brook Patterson USGS partial- number record site 01118350 01118750 01119255 01119360 01120200 01120700 01120920 01121300 01121350 01125300 01125600 01125900 01126700 01127100 01127400 01127700 01127790 01127800 01183990 01184300 01191900 01192800 01193120 01193130 01193210 01193300 01193600 01196600 01198700 01201890 01202700 01203100 01203700 01208900 Low-flow statistics derived using the MOVE.3 method for short-term streamgaging stations and partial-record sites in Connecti cut.

8 9 10 12 15 17 18 20 21 27 30 31 36 39 40 42 43 44 49 52 82 87 90 91 92 93 95 Map 107 110 121 123 125 127 142 (fig. 2) number reference reference Table 9. Table ft [USGS, U.S. Geological Survey; Table 9 33

------Index station used in relation 01121000 01187300 01206400 01194500 01195100 01201190 01208950 - - Cor 0.87 0.92 0.89 0.88 0.86 0.95 0.83 cient 0.80 0.80 0.80 0.80 0.80 coeffi relation ≤ ≤ ≤ ≤ ≤

/s 3 ------2.59 8.43 0.40 0.49 0.50 3.68 0.69 flow, flow, in ft August median ------85 2.90 9.10 0.48 0.67 0.49 3.84 0.63 ------90 1.93 7.34 0.23 0.24 0.27 3.05 0.38 /s 3 ------95 1.13 5.49 0.10 0.04 0.12 2.37 0.17 ------97 0.84 4.53 0.07 0.02 0.07 1.84 0.11 /s 3 Flow durations, in ft ------98 0.65 3.84 0.05 0.01 0.04 1.55 0.07 ------99 0.47 2.99 0.03 0.00 0.02 1.21 0.04 Streamflow, in ft Streamflow, /s 3 ------1.88 7.25 0.23 0.13 0.24 2.66 0.39 2-year 30-day, 30-day, ------1.01 4.98 0.08 0.03 0.09 1.83 0.15 7-day, 7-day, 2-year ------0.39 2.69 0.02 0.00 0.01 1.02 0.02 Low-flow frequency, in ft Low-flow frequency, 7-day, 7-day, 10-year River name /s, cubic feet per second; --, not computed] 3 Roaring Brook Sandy Brook Cherry Brook Hop Brook Podunk River Hammonasset River Brook Pond Meadow Hollenbeck River Deming Brook Ledgy Brook River Weekeepeemee Little River USGS station number short-term 01119320 01186400 01187680 01189180 01190055 01195117 01195146 01198800 01198860 01198870 01203805 01208999 Low-flow statistics derived using the MOVE.3 method for short-term streamgaging stations and partial-record sites in Connecti cut.—Continued

11 57 62 69 74 Map 101 102 111 112 113 128 146 (fig. 2) number Table 9. Table ft [USGS, U.S. Geological Survey; reference Prepared by the Pembroke Publishing Service Center

For more information concerning the research in this report, contact: Virginia de Lima, Director U.S. Geological Survey Connecticut Water Science Center 101 Pitkin St. East Hartford, CT 06108 or visit our Web site at: http://ct.water.usgs.gov Ahearn— Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005— Scientific Investigations Report 2007–5270

Prepared in cooperation with the Connecticut Department of Environmental Protection and New England Water Pollution Control Commission

Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Scientific Investigations Report 2007–5270

U.S. Department of the Interior U.S. Geological Survey