Prepared in cooperation with the Virginia Department of Transportation
Peak-Flow Characteristics of Virginia Streams
Culpeper Basin
WASHINGTON, D.C.
MARYLAND
WEST VIRGINIA
Chesapeake Bay
KENTUCKY
ATLANTIC OCEAN
TENNESSEE NORTH CAROLINA
Scientific Investigations Report 2011–5144
U.S. Department of the Interior U.S. Geological Survey Cover art. See figure 1 (map showing peak-flow study sites in Virginia). Peak-Flow Characteristics of Virginia Streams
By Samuel H. Austin, Jennifer L. Krstolic, and Ute Wiegand
Prepared in cooperation with the Virginia Department of Transportation
Scientific Investigations Report 2011–5144
U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director
U.S. Geological Survey, Reston, Virginia: 2011
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Suggested citation: Austin, S.H., Krstolic, J.L., and Wiegand, Ute, 2011, Peak-flow characteristics of Virginia streams: U.S. Geological Survey Scientific Investigations Report 2011–5144, 106 p. + 3 tables and 2 appendixes on CD.
(Also available online at http://pubs.usgs.gov/sir/2011/5144/.)
ISBN 978 1 4113 3288 1 iii
Contents
Abstract...... 1 Introduction...... 1 Purpose and Scope...... 1 Background...... 1 Physical Setting...... 1 Coastal Plain...... 3 Piedmont...... 3 Blue Ridge...... 3 Valley and Ridge...... 4 Appalachian Plateaus...... 4 Previous Studies...... 4 Approach...... 4 Site Selection...... 4 Data Evaluation...... 8 Flood-Frequency Analysis...... 8 Basin Characteristics...... 9 Regionalization...... 10 Definition of Regions...... 10 Model Development...... 10 Model Verification and Diagnostics...... 11 Weighting Multiple Estimates...... 12 Weighting of Independent Estimates...... 13 Peak-Flow Characteristics...... 13 Other Methods for Estimation at Ungaged Sites...... 13 Examples of Calculating Peak-Flow Estimates...... 14 Use of Regression Equations...... 14 Drainage-Area Ratio Method...... 14 Ungaged Site with Nearby Gage...... 15 Gaged Site...... 15 Summary...... 15 Acknowledgments...... 16 References...... 16 Glossary...... 20 Appendix 1. Curves and residual plots for candidate single-parameter regional regression equations for estimating peak flows of streams in Virginia...... CD in pocket Appendix 2. Curves and residual plots for candidate multi-parameter regional regression equations for estimating peak flows of streams in Virginia...... CD in pocket iv
Figures
1. Map showing selected peak-flow study sites and physiographic provinces for application of peak-flow regional estimating equations...... 2 2. Example leverage plots showing significant explanatory power, insignificant explanatory power, and evidence of collinearity...... 11
Tables
1. Sites used in the study and their identifying information...... CD in pocket 2. Peak-flow characteristics of streamgaging stations in Virginia...... 21 3. Regional regression equations for estimating peak flows of streams in Virginia...... 5 4. Statistics summarizing basin characteristics selected for regional regression of peak flows in Virginia...... CD in pocket 5. Selected basin characteristics, their definitions, and datasources...... 6 6. Selected basin characteristics at peak-flow streamgaging stations in Virginia...... CD in pocket
Conversion Factors
Inch/Pound to SI Multiply By To obtain Length inch (in.) 2.54 centimeter (cm) inch (in.) 25.4 millimeter (mm) foot (ft) 0.3048 meter (m) mile (mi) 1.609 kilometer (km) Area acre 0.4047 hectare (ha) square mile (mi2) 259.0 hectare (ha) Volume gallon (gal) 0.003785 cubic meter (m3) cubic foot (ft3) 0.02832 cubic meter (m3) acre-foot (acre-ft) 1,233 cubic meter (m3) Flow rate cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s) Hydraulic gradient foot per mile (ft/mi) 0.1894 meter per kilometer (m/km)
Vertical coordinate information is referenced to the North American Vertical Datum of 1929 (NAVD 29). Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83). Elevation, as used in this report, refers to distance above the vertical datum. Peak-Flow Characteristics of Virginia Streams
By Samuel H. Austin, Jennifer L. Krstolic, and Ute Wiegand
Abstract landscapes. Peak-flow estimates provide a basis for analysis of future streamflow response to changes in ecosystem and Peak-flow annual exceedance probabilities, also called climate. probability-percent chance flow estimates, and regional regression equations are provided describing the peak-flow Purpose and Scope characteristics of Virginia streams. Statistical methods are used to evaluate peak-flow data. Analysis of Virginia peak-flow data This report summarizes a statistical analysis of peak-flow collected from 1895 through 2007 is summarized. Methods are data collected in Virginia from 1895 through 2007. Methods provided for estimating unregulated peak flow of gaged and are provided for estimating the peak flow of gaged and ungaged streams. Station peak-flow characteristics identified ungaged streams in Virginia. Basin characteristics and station by fitting the logarithms of annual peak flows to a Log- peak-flow characteristics are presented for 476 streamgaging Pearson Type III frequency distribution yield annual exceed- stations located throughout the State. Regression methods are ance probabilities of 0.5, 0.4292, 0.2, 0.1, 0.04, 0.02, 0.01, used with gaging-station records to develop regional equations 0.005, and 0.002 for 476 streamgaging stations. Stream basin to estimate peak flows at ungaged sites. Regional regression characteristics computed using spatial data and a geographic equations are presented for six peak-flow regions based on information system are used as explanatory variables in physiography to estimate peak flows at ungaged sites in each regional regression model equations for six physiographic region. Methods are provided to incorporate peak-flow data regions to estimate regional annual exceedance probabilities at gaging stations with regional estimates and to improve at gaged and ungaged sites. Weighted peak-flow values that peak-flow estimates at sites where nearby gaging-station combine annual exceedance probabilities computed from records are available. This study supersedes previous studies gaging station data and from regional regression equations of peak flows in Virginia. provide improved peak-flow estimates. Text, figures, and lists are provided summarizing selected peak-flow sites, delineated physiographic regions, peak-flow estimates, basin Background characteristics, regional regression model equations, error estimates, definitions, datasources, and candidate regression Since 1949, the U.S. Geological Survey (USGS), in model equations. This study supersedes previous studies of cooperation with the Virginia Department of Transportation peak flows in Virginia. (VDOT), has maintained a network of partial-record peak- flow gaging stations. Records from continuous-record and partial-record gaging stations provide annual peak-flow data throughout Virginia (Prugh and others, 1991; Bisese, 1995). Introduction In this cooperative study with VDOT, peak-flow data from 476 streamgaging stations were used to provide detailed analy- Understanding peak water flows in Virginia streams is sis of the magnitude and frequency of peak flows at gaged essential to human safety and sound management of our water sites. Equations were developed for estimating peak flows at resources and associated riparian and watershed ecosystems. ungaged locations. These data and methods support evaluation Meaningful characterizations of the magnitude and frequency by VDOT of peak flows throughout Virginia. of peak flows provide valuable insights into the dynamics and variability of water movement through these unique stream systems. Improved estimates of peak flows are helpful Physical Setting for management decisions including (1) locating highways, industries, railroads, farms, and residences, (2) designing and Virginia is located on the Atlantic Coast, bordered to building bridges, dams, reservoirs, levees, floodwalls, and the north by Maryland and West Virginia, to the south by culverts, and (3) effectively managing the riparian systems North Carolina and Tennessee, and to the west by Kentucky and ecology associated with forested, agricultural, and urban and West Virginia, (fig. 1). The total area of Virginia is 2 Peak-Flow Characteristics of Virginia Streams
75°
ATLANTIC OCEAN ATLANTIC Chesapeake Bay Chesapeake 76°
0 200 20 40 MILES 40 KILOMETERS NORTH CAROLINA NORTH WASHINGTON, D.C. WASHINGTON, MARYLAND 77° Culpeper Basin 78° 79°
80° WEST VIRGINIA WEST 81° 82° Mesozoic Basins
83° KENTUCKY Coastal Plain Piedmont Blue Ridge and Ridge Valley Appalachian Plateau Fall Line Selected peak-flow study sites and physiographic provinces for application of regional estimating equations. Peak-flow site EXPLANATION
TENNESSEE Physiographic provinces Site Type Figure 1. Figure 1. Selected peak-flow study sites and physiographic provinces for application of regional estimating equations. Base from U.S. Geological Survey Digital Line Graph, 1:2,000,000, 1987 Geologic Map, Dicken and others (2005), 1:500,000 Adapted physiography from Fenneman and Johnson (1946), 1:7,000,000, Virginia 40° 39° 38° 37° 36° Introduction 3 approximately 41,000 square miles (mi2). This includes almost the base of the Blue Ridge Mountains east to the Fall Line. It 1,000 mi2 of lakes, tidal rivers, and bays. There are more than is the largest physiographic region in Virginia, is widest along 3,000 miles (mi) of nontidal rivers and more than 5,000 mi the Virginia–North Carolina border (approximately 125 mi of shoreline along the Atlantic Coast and Chesapeake Bay wide), then narrows to about 25 mi wide in northern Virginia. (Fenneman, 1938; Fenneman and Johnson, 1946). The Piedmont is formed mainly of metamorphic and igneous Virginia lies within five physiographic provinces—the rocks that consist of granite, gneiss, schist, slate, phyllite, and Coastal Plain, Piedmont, Blue Ridge, Valley and Ridge, quartzite. Triassic and Jurassic sedimentary rocks form several and Appalachian Plateaus Physiographic Provinces. Each early Mesozoic Basins in the Piedmont that consist mainly of province, hereafter termed physiographic region or peak-flow shales and sandstones intruded by diabase. Geologic forma- region, has distinctive geologic features and landforms. Geol- tions of the Piedmont trend northeast-southwest and generally ogy ranges from unconsolidated sands and clays in the Coastal are covered by a deep (6 to 65 ft) layer of saprolite. Outcrops Plain physiographic region, to igneous and metamorphic rocks commonly are restricted to stream valleys where saprolite has in the Piedmont and Blue Ridge physiographic regions, to been removed by erosion. The topography becomes somewhat sedimentary rocks, carbonate rocks, sandstone, and shale in more rugged with proximity to the Blue Ridge physiographic the Valley and Ridge and Appalachian Plateaus physiographic region, where local hills, knobs, or ridges of more resistant regions (Hayes, 1991). Topography ranges from virtually flat rock are present (Fenneman, 1938). in the Coastal Plain to highly dissected rugged terrain along The Mesozoic Basins are located within the Piedmont, the Blue Ridge and Appalachian crests. The central Piedmont but they are evaluated as a separate physiographic region is characterized by rolling hills and valleys, and is separated in this study because of their unique geomorphology and from the Valley and Ridge physiographic region by the Blue the associated improvements in explanatory power of basin Ridge Mountains. Land-surface elevations range from 0 feet characteristics in regional regression equations developed (ft) to over 5,000 ft above sea level (Fenneman, 1938). specifically for Mesozoic Basins. The Mesozoic Basins consist of sediments deposited in fault basins and are usually referred to as Triassic Basin deposits, though they are known to also Coastal Plain contain lower Jurassic rocks. These basins formed when The Coastal Plain physiographic region (Coastal Plain) Africa separated from North America to create the Atlantic generally consists of unconsolidated, gently sloping layers of Ocean. The Culpeper basin in the western Piedmont near sand and gravel separated by layers of clay and marl. The east- the Blue Ridge physiographic region is the largest Mesozoic ern boundary of the Coastal Plain is the Atlantic Ocean. The Basin in Virginia, but smaller basins, including the Richmond, western boundary is the Fall Line, where the resistant rock of Farmville, and Danville, are scattered throughout the the Piedmont forms a contact with the unconsolidated sedi- Piedmont. Structurally, these are partially depressed blocks of ments of the Coastal Plain (Fenneman, 1938). Sediments are land with a main fault on the western side. Ancient alluvial fan thin at the Fall Line and thicken to as much as 6,000 ft at the conglomerates fill these basins along the western borders, and eastern edge of the Coastal Plain and are more than 13,000 ft deep red sediments often containing fish fossils or dinosaur thick under the Continental Shelf. These sediments rest on tracks fill the eastern portions of these basins, indicating that an eroded surface of Precambrian to early Mesozoic rock. tropical lakes and mudflats were present. Numerous igneous Two-thirds of this material is composed of late Jurassic and rocks and lava flows are cut into these Triassic sediments and Cretaceous clay, sand, and gravel, which was stripped from are remnants of the volcanic activity that accompanied the the Appalachian mountains, carried eastward by rivers, and opening of the Atlantic Ocean (Hayes, 1991). deposited in deltas in the newly formed Atlantic Ocean basin. A sequence of thin, fossiliferous marine sands of Tertiary age Blue Ridge overlies the older strata. These sands were deposited in warm, shallow seas during repeated marine transgressions across the The Blue Ridge physiographic region (Blue Ridge) lies Coastal Plain (Hayes, 1991). This pattern of deposition was between the Valley and Ridge physiographic region and the interrupted about 35 million years ago by a large meteorite Piedmont physiographic region. It is a fairly thin ridge of that plummeted into a shallow sea and created a crater more northeast–southwest-trending mountains consisting mainly than 55 mi in diameter, termed the Chesapeake Bay impact of metamorphic and igneous rocks, with some sedimentary structure, which was subsequently buried under about 4,000 ft rock on the western slope. By the early Cambrian, the of younger sediment (Edwards and others, 2005). Rivers Iapetus Ocean had opened to the east of the Blue Ridge, and and streams are affected by tides over a substantial area a westward transgression occurred along the ancient North (Fenneman, 1938; Fenneman and Johnson, 1946). American margin. In the western Blue Ridge, shallow marine siliclastics of the Chilhowee Group were deposited in the early Piedmont Cambrian and eventually gave way to carbonates of Cambro- Ordovician age. In central and northern Virginia, the Blue The Piedmont physiographic region (Piedmont) in Ridge Mountains rise to elevations exceeding 4,000 ft. Local Virginia consists of gently rolling terrain, which extends from relief on the east side of the Blue Ridge is up to 3,000 ft. In 4 Peak-Flow Characteristics of Virginia Streams southern Virginia, the Blue Ridge forms a broad plateau-like Approach upland that rises over 1,500 ft from the Piedmont along a prominent escarpment. Mt. Rogers (5,728 ft), in the south- Peak-flow characteristics were determined by western Virginia Blue Ridge, is the highest peak in Virginia. flood-frequency analysis and regional regression of basin Steep slopes allow only thin soils in some areas, thus reducing characteristics. Study sites were selected, data were evaluated, the amount of groundwater storage (Hayes, 1991). basin characteristics were compiled, and flood-frequency and regional analyses were performed. Valley and Ridge Flood-frequency analysis consisted of fitting the logarithms of annual peak flows for 476 streamgaging stations The Valley and Ridge physiographic region (Valley to a Log-Pearson Type III frequency distribution yielding and Ridge) was formed by the folding and faulting of annual exceedance probabilities of 0.5, 0.4292, 0.2, 0.1, 0.04, sedimentary rocks. Northeast–southwest-trending ridges are 0.02, 0.01, 0.005, and 0.002. Regional regression of basin formed by resistant quartzite, sandstone, and conglomerates, characteristics consisted of using spatial data and a geographic while narrow valleys are underlain by limestone, shale, and information system to compute basin characteristics, and dolostone. The characteristic topography of this region is the using basin characteristics as explanatory variables in regional result of differential weathering of linear belts of rocks that regression equations specific to six physiographic regions to has been repeated by folding and faulting. Cambrian clastic estimate regional annual exceedance probabilities. Past USGS sediments of the western Blue Ridge are overlain by carbonate publications that describe peak-flow characteristics have rocks. For at least 70 million years, carbonates were deposited often reported these values using a recurrence interval format. in a shallow, tropical ocean along the southeastern edge of Annual exceedance probability (AEP), now recognized as a North America. Today these carbonates, up to 2 mi thick, are preferred reporting format, is used in this report. exposed in the Great Valley, known as the Shenandoah Valley Study results are presented in six tables and two in central and northern Virginia, and in the easternmost part appendixes. Sites selected for study are identified in table 1 of the Valley and Ridge. Well-developed karst topography (compact disc (CD) in pocket). Peak-flow characteristics from is characteristic of the Great Valley, and many caverns are Log-Pearson Type III analyses, weighted peak-flow estimates, located in the subsurface (Hayes, 1991). and estimates based on regional regression equations are summarized in table 2 (p. 21). Peak-flow regional regres- Appalachian Plateaus sion equations are listed in table 3. Statistics summarizing selected basin characteristics are presented in table 4 (CD in The Appalachian Plateaus physiographic region (Appa- pocket). Table 5 lists selected basin characteristic definitions lachian Plateaus), locally known as the Cumberland Plateau, and datasources. Table 6 (CD in pocket) lists values of consists of westward-dipping, consolidated, sedimentary rocks selected basin characteristics for each study site. Appendix 1 composed mainly of sandstone, shale, and coal. It is located shows curves and residual plots describing the candidate at the western end of Virginia. Extensive erosion has formed single-parameter regional regression equations for estimating steep slopes and narrow valleys throughout this province. peak flows of streams in Virginia. Appendix 2 shows curves Although some parts of the Appalachian Plateaus exhibit a and residual plots describing the candidate multi-parameter low relief plateau-like morphology, much of the Appalachian regional regression equations for estimating peak flows of Plateaus is strongly dissected by stream erosion, and the streams in Virginia. (Appendixes are on CD in pocket.) topography is rugged. Regional-scale folds in the Appalachian Plateaus were formed in response to shortening on thrust faults that do not reach the present surface and are rooted to the east Site Selection in the Valley and Ridge. The upper Paleozoic strata of the Appalachian Plateaus are rich in mineral resources, such as Streamgaging stations with at least 10 years of continu- coal, natural gas, and petroleum (Fenneman, 1938; Fenneman ous record were identified as candidates for study. All of and Johnson, 1946). these streamgaging stations were considered, including those in predominately urban and predominately rural basins. Previous Studies Peak-flow data from each candidate streamgaging station were quality checked to identify any numerical errors. Then, Previous statistical analyses of peak-flow data in Virginia a data table was created for each candidate streamgaging have been reported by Tice (1950), Speer and Gamble (1964a, station listing all datapoints collected during the period of 1964b, 1965), Miller (1969, 1978), and Bisese (1995). This record. Each list of datapoints was individually evaluated study builds on these earlier analyses, incorporating 12 years using written accounts of past data-collection procedures and of data collected since Bisese’s (1995) report. Population anecdotal information specific to each gaging site, to discover has increased, urban areas have expanded, and land use has and segregate any intervals in the record in which concomitant changed at an accelerating pace since Bisese’s study was effects such as data of poor quality or severely altered or published. regulated flows negatively affected the candidate data. Data Approach 5
Table 3. Regional regression equations for estimating peak flows of streams in Virginia.
[DA, basin drainage area in square miles]
Average standard Standard model Pseudo error of predictiona errora R-squarea (in percent) (in percent) Virginia basins in the Coastal Plain region Log10(0.2 peak) = 1.918 + 0.644 • Log10(DA) 0.91 48 44 Log10(0.1 peak) = 2.107 + 0.626 • Log10(DA) 0.90 51 47 Log10(0.04 peak) = 2.315 + 0.609 • Log10(DA) 0.88 56 51 Log10(0.02 peak) = 2.457 + 0.594 • Log10(DA) 0.86 60 55 Log10(0.01 peak) = 2.580 + 0.583 • Log10(DA) 0.84 65 58 Log10(0.005 peak) = 2.698 + 0.573 • Log10(DA) 0.82 71 64 Virginia basins in the Piedmont region, except those within the Mesozoic Basin region Log10(0.5 peak) = 2.197 + 0.593 • Log10(DA) 0.74 46 43 Log10(0.4292 peak) = 2.287 + 0.576 • Log10(DA) 0.74 45 42 Log10(0.2 peak) = 2.540 + 0.551 • Log10(DA) 0.93 34 32 Log10(0.1 peak) = 2.719 + 0.534 • Log10(DA) 0.93 33 31 Log10(0.04 peak) = 2.916 + 0.514 • Log10(DA) 0.92 34 32 Log10(0.02 peak) = 3.043 + 0.501 • Log10(DA) 0.91 36 34 Log10(0.01 peak) = 3.157 + 0.490 • Log10(DA) 0.90 38 36 Log10(0.005 peak) = 3.263 + 0.480 • Log10(DA) 0.89 41 38 Virginia basins in the Mesozoic Basin region Log10(0.5 peak) = 2.002 + 0.722 • Log10(DA) 0.85 44 41 Log10(0.4292 peak) = 2.090 + 0.707 • Log10(DA) 0.85 44 42 Log10(0.2 peak) = 2.416 + 0.660 • Log10(DA) 0.83 44 42 Log10(0.1 peak) = 2.656 + 0.624 • Log10(DA) 0.82 44 41 Log10(0.04 peak) = 2.923 + 0.586 • Log10(DA) 0.81 43 40 Log10(0.02 peak) = 3.097 + 0.561 • Log10(DA) 0.80 42 39 Log10(0.01 peak) = 3.265 + 0.537 • Log10(DA) 0.80 41 37 Log10(0.005 peak) = 3.401 + 0.521 • Log10(DA) 0.80 40 36 Virginia basins in the Blue Ridge region Log10(0.5 peak) = 2.127 + 0.709 • Log10(DA) 0.98 18 17 Log10(0.4292 peak) = 2.204 + 0.700 • Log10(DA) 0.98 19 18 Log10(0.2 peak) = 2.490 + 0.668 • Log10(DA) 0.97 22 20 Log10(0.1 peak) = 2.689 + 0.647 • Log10(DA) 0.95 26 24 Log10(0.04 peak) = 2.893 + 0.629 • Log10(DA) 0.92 31 29 Log10(0.02 peak) = 3.030 + 0.616 • Log10(DA) 0.91 34 32 Log10(0.01 peak) = 3.184 + 0.593 • Log10(DA) 0.86 33 30 Log10(0.005 peak) = 3.288 + 0.586 • Log10(DA) 0.83 37 33 Virginia basins in the Valley and Ridge region Log10(0.5 peak) = 2.053 + 0.733 • Log10(DA) 0.94 24 22 Log10(0.4292 peak) = 2.121 + 0.725 • Log10(DA) 0.94 24 23 Log10(0.2 peak) = 2.382 + 0.689 • Log10(DA) 0.92 25 24 Log10(0.1 peak) = 2.557 + 0.665 • Log10(DA) 0.90 28 27 Log10(0.04 peak) = 2.741 + 0.642 • Log10(DA) 0.86 33 31 Log10(0.02 peak) = 2.862 + 0.626 • Log10(DA) 0.83 37 35 Log10(0.01 peak) = 2.963 + 0.615 • Log10(DA) 0.80 41 39 Log10(0.005 peak) = 3.063 + 0.603 • Log10(DA) 0.76 46 43 Virginia basins in the Appalachian Plateau region Log10(0.5 peak) = 1.980 + 0.833 • Log10(DA) 0.94 0.25 0.23 Log10(0.4292 peak) = 2.048 + 0.824 • Log10(DA) 0.94 0.26 0.23 Log10(0.2 peak) = 2.289 + 0.798 • Log10(DA) 0.91 0.31 0.28 Log10(0.1 peak) = 2.450 + 0.781 • Log10(DA) 0.86 0.37 0.34 Log10(0.04 peak) = 2.631 + 0.759 • Log10(DA) 0.80 0.45 0.41 Log10(0.02 peak) = 2.740 + 0.750 • Log10(DA) 0.76 0.51 0.47 a Generalized least squares regression. 6 Peak-Flow Characteristics of Virginia Streams
Table 5. Selected basin characteristics, their definitions, and datasources.—Continued
[ft, foot; mi2, square mile; ft/mi, foot per mile; DD, decimal degrees; in., inch]
Basin characteristic Units Definition Datasource Mean elevation ft The average elevation in the basin. U.S. Geological Survey, 2007, National Elevation Data Set (NED) Drainage area mi2 Published values of surface drainage area for each Hayes and Wiegand, 2006 basin in the study. Basin slope ft/mi The average slope of the basin from upland to outlet. U.S. Geological Survey, 2007, National Elevation Data Set (NED) Perimeter mi The length of the basin boundary. U.S. Geological Survey, 2007, National Elevation Data Set (NED) Latitude DD The east-west coordinate at the U.S. Geological Survey, 2007, National Elevation Data Set (NED) centroid of the basin boundary. Longitude DD The north-south coordinate at the centroid of the basin U.S. Geological Survey, 2007, National Elevation Data Set (NED) boundary. Elevation ft The distance above sea level associated with the center U.S. Geological Survey, 2007, National Elevation Data Set (NED) point of the watershed polygon. Basin relief ft The difference between maximum and minimum eleva- U.S. Geological Survey, 2007, National Elevation Data Set (NED) tion within the basin. Valley length mi The length of the main valley within the basin. U.S. Geological Survey, 2007, National Elevation Data Set (NED) Channel slope ft/mi The slope of the main chanel within the basin. U.S. Geological Survey, 2007, National Elevation Data Set (NED) Elevation at 10 percent ft The distance above sea level associated with the main U.S. Geological Survey, 2007, National Elevation Data Set (NED) channel at 10 percent of the basin drainage area from the outlet. Elevation at 85 percent ft The distance above sea level associated with the main U.S. Geological Survey, 2007, National Elevation Data Set (NED) channel at 85 percent of the basin drainage area from the outlet. Stream length mi Length along the main channel from the outlet to the U.S. Geological Survey, 2006, National Hydrography Dataset basin divide. Forest percent Fraction of basin land area classified as forest. Homer and others, 2004, http://www.mrlc.gov/nlcd.php Urban percent Fraction of basin land area classified as urban area. Homer and others, 2004, http://www.mrlc.gov/nlcd.php Agriculture percent Fraction of basin land area classified as agricultural Homer and others, 2004, http://www.mrlc.gov/nlcd.php land. Wetland percent Fraction of basin land area classified as wetland. Homer and others, 2004, http://www.mrlc.gov/nlcd.php Water percent Fraction of basin land area classified as surface water. Homer and others, 2004, http://www.mrlc.gov/nlcd.php Grass percent Fraction of basin land area classified as grassland. Homer and others, 2004, http://www.mrlc.gov/nlcd.php Bare percent Fraction of basin land area classified as exposed soil. Homer and others, 2004, http://www.mrlc.gov/nlcd.php Basin area in Coastal mi2 Area within the Coastal Plain Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and Plain physiographic physiographic region. others, 2005 region Basin area in Piedmont mi2 Area within the Piedmont physiographic region. Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and physiographic region others, 2005 Basin area in Blue mi2 Area within the Blue Ridge physiographic region. Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and Ridge physiographic others, 2005 region Basin area in Valley and mi2 Area within the Valley and Ridge physiographic region. Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and Ridge physiographic others, 2005 region Basin area in Ap- mi2 Area within the Appalachian Plateau physiographic Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and palachian Plateaus region. others, 2005 physiographic region Basin area in Mesozoic mi2 Area within the Mesozoic Basin physiographic region. Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and Basins physiographic others, 2005 region Basin area in water mi2 Area covered in surface water. Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and others, 2005 Basin area in Coastal percent Percent of the basin within the Coastal Plain physio- Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and Plain physiographic graphic region. others, 2005 region Basin area in Piedmont percent Percent of the basin within the Piedmont physiographic Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and physiographic region region. others, 2005 Basin area in Blue percent Percent of the basin within the Blue Ridge physio- Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and Ridge physiographic graphic region. others, 2005 region Approach 7
Table 5. Selected basin characteristics, their definitions, and datasources.—Continued
[ft, foot; mi2, square mile; ft/mi, foot per mile; DD, decimal degrees; in., inch]
Basin characteristic Units Definition Datasource Basin area in Valley and percent Percent of the basin within the Valley and Ridge phys- Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and Ridge physiographic iographic region. others, 2005 region Basin area in Ap- percent Percent of the basin within the Appalachian Plateau Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and palachian Plateau physiographic region. others, 2005 physiographic region Basin area in Mesozoic percent Percent of the basin within the Mesozoic Basin physio- Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and Basin physiographic graphic region. others, 2005 region Basin area in water percent Percent of basin area covered in surface water. Fenneman and Johnson, 1946; Mixon and others, 1989; Dicken and others, 2005 Mean annual precipita- in. Mean annual precipitation falling on the basin, aver- PRISM Climate Group, 2007; Paybins, 2008 tion aged over the whole basin. Mean January–Febru- in. Mean January–February–March precipitation falling on PRISM Climate Group, 2007 ary–March precipita- the basin, averaged over the whole basin. tion 2-year 24-hour precipi- in. Basin average rainfall at the 24-hour 2-year recurrence National Oceanic and Atmospheric Administration, 2007; Paybins, tation intensity interval. 2008 Basin area with percent Percent of the basin coded as 0 percent impervious. Yang and others, 2002; Homer and others, 2004 0 percent impervious surface Basin area with percent Percent of the basin coded as 1 to 5 percent impervious. Yang and others, 2002; Homer and others, 2004 1–5 percent impervi- ous surface Basin area with percent Percent of the basin coded as 6 to 10 percent impervi- Yang and others, 2002; Homer and others, 2004 6–10 percent imper- ous. vious surface Basin area with percent Percent of the basin coded as 11 to 25 percent impervi- Yang and others, 2002; Homer and others, 2004 11–25 percent imper- ous. vious surface Basin area with percent Percent of the basin coded as 26 to 50 percent impervi- Yang and others, 2002; Homer and others, 2004 26–50 percent im- ous. pervious surface Basin area with percent Percent of the basin coded as 51 to 75 percent impervi- Yang and others, 2002; Homer and others, 2004 51–75 percent im- ous. pervious surface Basin area with percent Percent of the basin coded as 76 to 100 percent imper- Yang and others, 2002; Homer and others, 2004 76–100 percent vious. impervious surface Basin area with mi2 Area within the basin coded as 0 percent impervious. Yang and others, 2002; Homer and others, 2004 0 percent impervious surface Basin area with mi2 Area within the basin coded as 1 to 5 percent impervi- Yang and others, 2002; Homer and others, 2004 1–5 percent impervi- ous. ous surface Basin area with mi2 Area within the basin coded as 6 to 10 percent impervi- Yang and others, 2002; Homer and others, 2004 6–10 percent imper- ous. vious surface Basin area with mi2 Area within the basin coded as 11 to 25 percent imper- Yang and others, 2002; Homer and others, 2004 11–25 percent imper- vious. vious surface Basin area with mi2 Area within the basin coded as 26 to 50 percent imper- Yang and others, 2002; Homer and others, 2004 26–50 percent im- vious. pervious surface Basin area with mi2 Area within the basin coded as 51 to 75 percent imper- Yang and others, 2002; Homer and others, 2004 51–75 percent im- vious. pervious surface Basin area with mi2 Area within the basin coded as 76 to 100 percent Yang and others, 2002; Homer and others, 2004 76–100 percent impervious. impervious surface 8 Peak-Flow Characteristics of Virginia Streams within these affected intervals were segregated from the larger alternate time periods and computing a summary statistic dataset and not used in further analysis. for the period, such as a time-weighted mean or median, Similarly, using professional judgment, basin drainage and (4) removing the dataset from the pool of sites to be area and usable watershed storage volume upstream from the analyzed. If trends persisted in the revised dataset, then gaging location were calculated for each candidate dataset the candidate dataset was removed from consideration as a in which regulation was suspected. If the calculated volume possible study site. of usable water storage upstream from the gaging site met or Of the 589 candidate datasets considered for study, exceeded 100 acre-feet per square mile, an amount considered 113 were removed from consideration because they either had to significantly regulate streamflow, then the gaging station too few datapoints available for analysis, or they characterized was eliminated as a candidate site (Benson, 1962, 1964). streams with excessively regulated flow. Of the remaining Streamgaging stations used in this study are listed in table 1 476 sites, statistical trends were identified in 68 datasets. None (CD in pocket). of these trends were determined to be problematic, and none were detrended by sampling from the dataset and re-evaluating the auto-correlation of the sample. Thirty of these datasets Data Evaluation were partially censored due to indications of excessively regu- lated flow, and 5 datasets were partially censored because too Datapoints from each remaining dataset were plotted in many peak flows were measured below the gage base. These station-specific scatter plots, and each scatter plot was visually partially censored datasets were then used in the analysis. checked for evidence of trends. Summary statistics were gen- erated for each dataset along with additional statistics useful for identifying trends in data and monotonic, non-monotonic, Flood-Frequency Analysis linear, and non-linear correlation, including (1) calculating Kendall’s Tau, (2) creating an index of Kendall’s trend prob- Log-Pearson Type III adjusted flood-frequency analyses ability, and (3) calculating Spearman’s rho to help determine of data from each of the 476 selected gaging stations were the strength of any linear or non-linear monotonic trend used to determine peak flows at each site. The Log-Pearson (Helsel and Hirsch, 2002). Other statistical analyses include Type III analyses were performed using program PeakFQ (4) calculating and plotting a linear regression of each dataset (Flynn and others, 2006) following methods outlined in the with time, (5) plotting residuals to help identify any significant revised Bulletin 17B of the Hydrology Subcommittee of the correlation with time and, if evident, any negative or positive Interagency Advisory Committee on Water Data (Interagency autocorrelation, and (6) performing a runs test of each dataset Advisory Committee on Water Data, 1982). These analyses to help determine any significantly non-linear change over involve fitting a Pearson Type III frequency distribution time using GraphPad Prism.1 to the logarithms of annual peak flows and are used by all The results of these statistical tests were summarized Federal agencies for determining flood frequency. Major steps for each candidate dataset and used to help determine the performed as part of this process are summarized below. degree of significant auto-correlation within the data of 1. Systematic-Record Analysis. An analysis of the system- each candidate site. If no significant trend was evident at the atic record of data collected at each selected gage was 0.05 confidence level, the candidate site became part of the performed to compute the mean, standard deviation, and study pool. If a significant trend was evident in the dataset of coefficient of skewness (mean X, S, and G, respectively) a candidate site, the trend in the data was further evaluated of the common logarithms of the annual peak flows. to determine if (1) the trend could be directly attributed to a causal factor or (2) the trend produced values that exceed 2. Outlier Tests. Peaks that departed substantially from the those normally expected from a random sample. If the trend trend of the remaining peaks were classified as outli- could not be directly attributed to a causal factor or trend ers. Adjustments of the initial frequency curve involved values ranged within the bounds of expected statistical varia- detecting and accounting for high and low outliers. An tion, then the trend was considered non-problematic and no iterative sequence of tests and adjustments was made to efforts were made to compensate for it by adjusting the station each initial frequency curve to compensate for outlier dataset. If the trend could be attributed to a causal factor or values. The order of this sequence of adjustments was trend values were determined to range outside the bounds of dependent on the station skew coefficient, G, as computed expected statistical variation, then several methods to evaluate in the systematic-record analysis. the dataset and remove the trend were considered. These methods included (1) testing the dataset against an annual 3. Historical-Record Adjustment. Recalculation of the precipitation time series to identify any correlation with annual statistics of the above-base peaks was performed after precipitation, (2) sampling from the dataset, then re-evaluating detection of outliers or historical information such as his- the auto-correlation of the sample, (3) grouping the data into torical peaks, as specified in Appendix 6 of Bulletin 17B (Interagency Advisory Committee on Water Data, 1982). 1 GraphPad Prism version 5.0b, 2009, GraphPad Software, This historical adjustment filled in the ungaged portion San Diego, California. of the historic period in each record with an appropriate Approach 9
number of replications of the below-historical threshold where streamflow portion of the systematic record. X = the logarithm of the magnitude of the P-percent chance discharge, in cubic feet 4. Conditional-Probability Adjustment. After the peak- per second; streamflow frequency curve parameters were determined, X = the mean of the logarithms of the annual the historically weighted frequency curve was tabulated. peak streamflows; If no low outliers, zero flows, or below-gage base peaks K = the integration factor based on the skew of were present, Pearson Type III standardized ordinates for the logarithms and the given P-percent the desired skew coefficient and probability were deter- chance and is tabulated in Bulletin 17B mined and the logarithmic frequency curve ordinates were (Interagency Advisory Committee on computed. When peaks below the flood base were present, Water Data, 1982); and a conditional frequency curve was determined describing S = the standard deviation of the logarithms and only those peaks above the base. Then, a conditional- is a measure of the variation of the peaks probability adjustment was made to account for the frac- about the mean. tion of the population below the flood base. 5. Computation of Weighted Skew Coefficient. The station Completion of this analytical process resulted in peak- skew coefficient reflects the average of the cubed devia- flow frequency estimates (table 2). These estimates were tions from the sample mean and is highly sensitive to based on weighting of the streamgaging station skew and the observations in both the upper and lower tails of the the generalized skew as identified in Plate I of Bulletin 17B sample. The station skew coefficient was combined with (Interagency Advisory Committee on Water Data, 1982). the generalized skew, which is a skew coefficient represen- tative of neighboring stations, in a weighted average coef- Basin Characteristics ficient that is more accurate than either of its constituents. Measurements and statistics describing characteristics 6. Expected-Probability Adjustment. The expected prob- associated with delineated drainage basins in Virginia were ability frequency curve and a set of upper and lower developed and compiled for use as possible explanatory confidence limits were computed. These computations aid variables in peak-flow regional regression analyses. These the interpretation of the principal, historically weighted basin characteristics describing 312 unique attributes for each frequency curve calculated in the conditional-probability of 3,469 delineated drainage basins form a matrix of 1,082,328 adjustment. values. The basin characteristics were compiled using ArcGIS™2 and data from the following sources: (1) a Virginia Fitting the Log-Pearson Type III frequency distribution delineated drainage basin dataset (Hayes and Wiegand, 2006); to the logarithms of the annual peak flows required calculating (2) a USGS national hydrography dataset (U.S. Geological the mean, standard deviation, and skew coefficient of the Survey, 2006); (3) a Natural Resources Conservation Service logarithms of the annual peak-flow series. The mean, standard (NRCS) soil statistics dataset (U.S. Department of Agriculture, deviation, and skew coefficient describe the mid-point, slope, 2007); (4) a PRISM climate dataset (PRISM Climate Group, and curvature of the peak-flow frequency curve. 2007 ); (5) a National Oceanic and Atmospheric Administra- Annual exceedance probabilities, the reciprocals of tion (NOAA) rainfall intensity and climate dataset (National which are recurrence intervals, may be expressed as fractions Oceanic and Atmospheric Administration, 2007; Paybins, (or percentages), indicating the likelihood that a particular 2008); (6) a USGS 2005 geology dataset (Dicken and others, peak flow may occur. An annual exceedance probability of 2005); (7) a USGS 2007 national elevation dataset (U.S. 1 indicates a 1/1 or 100-percent chance of a particular flow, Geological Survey, 2007); and (8) a physiography dataset for while an annual exceedance probability of 0.10 indicates a the United States (Fenneman, 1938). Table 4 (CD in pocket) 1/10 or 10-percent chance of a particular peak flow. Using this lists statistics summarizing the basin characteristics that were terminology, a particular flood-frequency annual exceedance tested in regional regressions. Descriptions of these basin probability may be termed a P-percent chance flow where P is characteristics, their definitions, and datasources are listed the probability. Estimates of the annual peak-flow probabilities in table 5. Basin characteristics chosen for possible use in were computed with program PeakFQ by inserting the three candidate regional regression models are listed in table 6 statistics of the frequency distribution into the following (CD in pocket). Drainage-basin boundaries were obtained equation:
X= X + KS, (1) 2 Arc-GIS, ESRI Inc., copyright 1999–2009, ESRI ArcMap 9.3.1 and ArcInfo Workstation GIS software, ESRI Inc., 380 New York Street, Redlands, California 92373–8100. 10 Peak-Flow Characteristics of Virginia Streams from the delineated drainage basin dataset listed above (Hayes 88 sites were available in the Blue Ridge, 157 sites were and Wiegand, 2006). available in the Valley and Ridge, and 19 sites were available in the Appalachian Plateaus for use in developing regional regression equations. Scatter plots showing relations between Regionalization pairs of basin characteristics were evaluated along with basic descriptive statistics to (1) identify explanatory variable pairs Regional regression analysis was used to develop that are highly correlated with one another so that they may equations for estimating the magnitude and frequency of peak be evaluated and possibly removed from the selection dataset flows at ungaged sites in Virginia. These equations relate the and (2) determine candidate explanatory variable, response annual exceedance probability flows computed using flood- variable pairs that are highly correlated with potentially frequency analysis to the measured basin characteristics of significant explanatory power. In some instances, one or delineated drainage basins. both variables in an explanatory variable, response variable Six physiographic regions were used to organize pair were mathematically transformed to potentially enhance regression analyses of basin characteristics against peak-flow their relation and statistical power when part of a linear estimates. These six physiographic regions are similar to the regression model. Depending on the shape of each scatter plot five physiographic provinces identified in the discussion of relation, possible transformations of the X variable included physical setting except that the Mesozoic Basins, considered a 23 logX , XX , , and X , and possible transformations of the subset of the Piedmont Physiographic Province, are identified logY , YY , 23 , and Y , Y variable included as suggested by separately as one of the six physiographic regions. A rationale Tukey’s bulging rule (Mosteller and Tukey, 1977). Exploratory for this organizational framework, that physiographic differ- statistical investigation and comparison of the 312 candidate ences expressed in these six regions are related to hydrologic explanatory basin characteristics associated with each annual response, appeared to be a sound rationale because candidate exceedance probability peak-flow value proceeded iteratively regression models significantly improved across the range of until each candidate variable, peak-flow value x-y pair was peak-flow probabilities as a consequence of these regressions vetted for possible explanatory power. based on physiographic regions. Candidate regional regression models also were devel- oped following an iterative approach. For each region, and for Definition of Regions each peak-flow response variable, forward-, backward-, and mixed-stepwise regressions were used to identify combina- The six regions used to evaluate peak flows are Coastal tions of basin characteristics with likely explanatory power. Plain, Piedmont, Mesozoic Basins, Blue Ridge, Valley and A list of all possible 1-, 2-, and 3-parameter candidate models Ridge, and Appalachian Plateaus (fig. 1). Each region was was prepared for each peak-flow response variable. The list identified using ArcGIS™ to perform spatial separations of the of candidate models was sorted by the number of explanatory geology dataset. Regions were selected and identified itera- variables in each model. Then, candidate models in each tively, based on the improved explanatory power of candidate sub-list were evaluated using three metrics—the coefficient regression models associated with the regions across the range of determination (R-square), the root mean square error of peak-flow annual exceedance probabilities. The Mesozoic (RMSE), and Akaike’s information criterion (AIC), modified Basins, usually grouped with the Piedmont physiographic with a second-order correction for small sample sizes and region, were explicitly identified as a unique region for the identified as AICc (Burnham and Anderson, 2002). The most purposes of this study, leading to improved correlations among reasonable 1-, 2-, and 3-parameter models for each region candidate regional regression models. were chosen as final candidates for regional regression. Final candidate 1-, 2-, and 3-parameter regional regression models Model Development were prepared using statistical software (JMP® version 8). Exploratory analyses of all computed annual exceedance Explanatory variables for any 2- and 3-parameter models were probability peak flows and potential explanatory variables carefully chosen to ensure that each variable in the model (basin characteristics) were performed, prior to developing contributed adequate explanatory power and to avoid instances candidate regression models, using statistical software, JMP® of collinearity, autocorrelation, or excessive variance inflation. version 8.3 Sites with 50 percent or more of their drainage Regional regression models were evaluated and modified area within a region were included in developing that region’s iteratively. Final models were then selected. Coefficients of regression equations, with the exception of the Coastal Plain final models were specified using the generalized least squares region, in which all sites with 5 percent or more of their (GLS) option of the Weighted-Multiple-Linear Regression drainage area within the region were included in developing Program (WREG version 1.01; Eng and others, 2009). Prefer- the region’s regression equations. Of the 476 sites, 52 sites ence was given to regional regression models with explanatory were available in the Coastal Plain, 105 sites were available in variables that are easily determined and understood. Models the Piedmont, 55 sites were available in the Mesozoic Basins, with little explanatory power and high standard errors were not reported here. All final models, specified using GLS, are 1-parameter models. 3 SAS Institute Inc., 2009, Cary, North Carolina. Regionalization 11
Model Verification and Diagnostics A 5.0 Evaluation of candidate models using R-square, RMSE, and AICc provided insights into the most appropriate candidate 4.5 model choices for each peak-flow response variable in each region. The R-square value indicated the proportion of vari- 4.0 ability in each relation that was accounted for by the statistical 3.5 model—in this case, a linear regression model. R-square log10 peak flow values approaching 1 suggest increased explanatory power. 3.0
The RMSE value indicated the differences between values 2.5 predicted by each model and the values actually observed or measured. The RMSE helped to aggregate individual residual 2.0 0 1 2 3 differences into a single measure of predictive power. To assist log10 drainage area, in square miles in choosing among candidate models in each region, plots Leverage, P<0.0001 were constructed identifying each candidate model by the number of model parameters (x-axis) and RMSE value (y-axis), B providing a spatial representation of increased or decreased RMSE relative to the number of model terms. The AICc value 5.5 indicated the goodness of fit of each regression model, relative 5.0 to other candidate models in the list, providing a tool for model selection. AICc values are grounded in the concept of entropy, 4.5 offering a relative measure of the information lost when a given 4.0 model is used to describe reality. AICc describes the difference
log10 peak flow 3.5 between model bias and model variance, or the tradeoff between model precision and model complexity. Several competing 3.0 models were ranked by their AICc values. Lower AICc values 2.5 were considered better than higher values. Leverage plots (Sall, 1990), also known as “partial- –1 0 1 2 3 regression residual leverage plots” (Belsley and others, 1980) or log10 channel slope, in feet per mile Leverage, P=0.8909 “added variable plots” (Cook and Weisberg, 1982), were used to further investigate and screen candidate regional regression C models. Leverage plots allow one to view the significance of each model parameter in the candidate regression model within the context of the larger model. The effect of a model 4 parameter on the larger model is displayed on the leverage plot by comparing the sum of squared residuals of the model to the sum of squared residuals of the model with the effect of interest removed. Residual errors that are smaller when the effect of 3 a particular parameter is included in the model help confirm log10 peak flow that the effect contributes significantly to the model fit. The leverage plot graphically displays this potential significance for 2 each candidate explanatory variable in each candidate model, 1 2 showing for each point in the model what the residual would log10 perimeter, in miles be with and without the effect of the explanatory variable in the Leverage, P=0.2977 model. In the leverage plot, the distance from a point to the line of fit describes the actual residual. The distance from a point to Figure 2. Example leverage plots showing (A) significant Figure 2. Example leverage plots showing (a) significant explanatory the horizontal line of the mean describes the potential residual explanatory power, (B) insignificant explanatory power, and power, (b) insignificant explanatory power and, (c) evidence of collinearity. error if the effect were not part of the model. In other words, the (C) evidence of collinearity. The solid red lines represent the mean line of the leverage plot represents the model if the value significanceThe of solid each red explanatory lines represent model parameter,the significance shown of on each the explanatory model of the parameter effect were constrained to zero. The idea is to x-axis, withinparameter, the context shown of the on larger the x-axis, model. within The dashed the context red of the larger model. The determine if the line of fit on the leverage plot for each explana- lines representdashed the red confidence lines represent interval the of the confidence significance interval of each of the significance of tory variable carries each point on the plot significantly better explanatoryeach model explanatory parameter. model The dashed parameter. blue linesThe dashed represent blue lines represent the than does the horizontal line of the mean shown on the plot. the horizontalhorizontal line of linethe mean,of the describingmean, describing the larger the model larger if themodel if the effect of Leverage plots were used to identify (1) regression variables effect of eacheach explanatory explanatory model model parameter parameter were were constrained constrained to to zero. The idea with significant explanatory power, (2) regression variables with zero. The ideabehind behind each each leverage leverage plot plot is to is determine to determine if the if the line line of fit for each potential borderline or insignificant explanatory power, and (3) regression of fit for eachexplanatory potential modelexplanatory variable model carries variable each carries point eachon the plot significantly variables exhibiting significant collinearity within the model point on thebetter plot thansignificantly does the better horizontal than does line the of thehorizontal mean shown line on the plot. (fig. 2). of the mean shown on the plot. 12 Peak-Flow Characteristics of Virginia Streams
Analyses of leverage plots for each potential explanatory 1 n −1 T TT (2) variable in a candidate regression model afforded the oppor- AVP =+∧σ ii∑ x1 ( X X) X , n = tunity to see the characteristics of each candidate variable, n 1 the influential strength of the variable, and its consequences within the larger model. The picture provided by each leverage where plot enabled a thorough, visual vetting of individual candidate AVP = the average variance of prediction; σ T model variables and a measure of confidence in variable selec- i = the model error variance; tion that could not be obtained from non-graphical indices n = the number of stations in the regression of collinearity and variable inflation, preparing a means to model; construct robust regional regressions. A leverage plot was x = the vector containing the basin attributes of constructed and evaluated for each model parameter in each the ith station augmented by the value of 1; candidate regional regression model. Iterative comparisons of X = the matrix of all basin attributes at all stations models were made, and the stronger models were selected as in the regression augmented by a column final candidates. Models containing explanatory variables with of ones; significant explanatory power, limited parameter counts, and ∧ = the weighting matrix (Tasker and Stedinger, limited collinearity were preferred as final candidates. 1989); Explanatory variables associated with the best candidate T = superscript indicating taking the transpose of models were chosen for inclusion in final candidate single- a matrix; and parameter and multi-parameter regional regression models. –1 = superscript indicating taking the inverse of a Preference was given to explanatory variables that are easily matrix. measured and understood. Final models were specified using GLS regression as The second option is described by Stedinger and Tasker (1985) and Tasker and Stedinger (1989). Candidate regional regressions and their AVP= errormt + error , (3) associated leverage plots were carefully evaluated to avoid the effects of potential cross correlation between sites and where excessive variability in peak flows at streamgaging stations. AVP = the average variance of prediction; Because the length of streamflow record varies among errorm = model error; and stream gages, the precision of streamflow estimates also error = time sampling error. varies. Different streamflow records have different variances. t Peak flows at streamgaging stations within a particular region The AVP may be used to provide an estimate of errors are at risk of being correlated with other peak flows in the that may be associated with the use of a regression model region due to atmospheric conditions that may cause tempo- to estimate flow statistics at an ungaged site. An important rally coincident flood peaks. The concurrent flows observed consideration is that the AVP metric assumes that basin at different gages in a region can yield cross correlations. If characteristics at the ungaged location are similar to those these correlations are not accounted for in a regional analysis, used to develop the model. regression parameters may be less precise, and estimators of The average standard error of prediction in percent, S , precision may be less accurate (Eng and others, 2009). p is used in this report to express the AVP as a percentage. Sp is GLS analyses account for cross correlations among these computed from the AVP (Aitchison and Brown, 1957) characteristics. In GLS analyses, weights are formed using and modified for use with common logarithms as follows: the period of record and the variance of the response variable annual time series. The series of annual peaks at streamgaging 2 S=100 EXP σ 2 •−ln 10 1, (4) stations and the geographic distances between streamgages are p ( ) examined to help determine the degree of potential correlation between sites. Weights are assigned to account for variability. where Sites exhibiting potentially cross-correlated concurrent peak S = the average standard error of prediction, in flows are given less weight than other sites. Pseudo R-square p percent; and is reported for each GLS regression model. A metric in the 2 σ = the average variance of prediction. style of the R-square commonly reported as part of ordinary least squares regression, pseudo R-square is designed specifi- cally to evaluate the iterative models developed using GLS. The average variance of prediction (AVP; Stedinger and Weighting Multiple Estimates Tasker, 1985; Tasker and Stedinger, 1989) is a helpful indica- tion of the average error of a GLS regression. The AVP may be Weighting techniques often improve regional flow represented by one of two equations. The first option is estimates. This is true of peak-flow estimates, which may be Other Methods for Estimation at Ungaged Sites 13 improved by computing a weighted average of two indepen- Peak-Flow Characteristics dent estimates: (1) an estimate made by fitting a Log-Pearson Type III distribution to data using peak-flow analysis, and Peak-flow characteristics describe the magnitude and (2) an estimate made by developing a regional regression frequency of peak flows, providing insights into the dynamics equation describing station peak flow. and variability of water movement through stream systems. They offer a basis for evaluating risk and analyzing stream- Weighting of Independent Estimates flow response to changes in ecosystem and climate. Peak-flow characteristics are listed in table 2. Table 2 lists peak-flow Methods described in Appendix 8 of Bulletin 17B values determined by flood-frequency analysis as outlined (Interagency Advisory Committee on Water Data, 1982) were in Bulletin 17B, in which a Log-Pearson Type III frequency used to calculate a weighted estimate and variance at each distribution is fitted to the logarithms of annual peak flows. peak-flow station using information from flood-frequency These values were calculated using program PeakFQ (Flynn analysis and a corresponding regional regression equation. and others, 2006). The equations developed by Gilroy were used to determine the Table 3 lists peak-flow regional regression equations of weighted discharge and variance of peak flow at each station. the final models. Candidate single- and multi-parameter equa- The recommended procedure assumes that the two peak-flow tions were developed to determine annual exceedance prob- estimates are independent, which, as noted in Bulletin 17B, ability peak flows for each of six regions. Single-parameter is true in most practical situations (Interagency Advisory equations describing annual exceedance probability peak flow Committee on Water Data, 1982, p. 8-1; Cohn and others, as a function of basin drainage area (DA) were found to be 2001; Berenbrock, 2002). superior to multi-parameter regional regression equations, The idea is that if two independent estimates are weighted combining explanatory power, an easily measured explanatory in inverse proportion to their variances, then the variance variable (DA), ease of interpretation and use, and lower risks of the weighted average is less than the variance of either of explanatory variable inflation or collinearity. estimate. This is accomplished using the following equations Table 2 also lists peak-flow values computed from the (Interagency Advisory Committee on Water Data, 1982): regional regression equations listed in table 3 and peak-flow values determined by weighting the independent Log-Pearson Type III peak-flow estimates listed in table 2 with those xV( yx) + yV( ) Z = (5) computed from the equations in table 3. + VVyx For a gaged site, the most reliable estimates of peak-flow probabilities are generally provided by the values listed and in table 2 developed from fitting a Log-Pearson Type III frequency distribution to the logarithms of the annual peak flows. Weighted peak-flow probabilities listed in table 2 may VVxy Vz = , (6) be used when circumstances suggest that a weighted estimate VV+ xy may be helpful, combining Log-Pearson Type III fitted values and estimates from regional regression equations. where x = a first independent estimate of peak flow; y = a second independent estimate of peak flow; Z = a weighted average estimate of peak flow; Other Methods for Estimation at
Vx = variance of a first independent estimate of Ungaged Sites peak flow;
Vy = variance of a second independent estimate of For an ungaged site, the appropriate method for calculat- peak flow; and ing peak-flow estimates depends on whether (1) the drainage
Vz = variance of a weighted average estimate of basin lies within a single peak-flow region, (2) the drainage peak flow. area crosses peak-flow regional boundaries, or (3) the ungaged site is located on a gaged stream. Using the procedures described in Bulletin 17B and Peak-flow estimates at sites on ungaged streams that lie equations 5 and 6, peak-flow estimates determined using entirely within a single peak-flow region may be calculated Log-Pearson Type III frequency analysis (table 2) were used using the regional regression equations listed in table 3. with peak-flow estimates determined by the regional regres- Peak-flow estimates at sites with drainage basins that sion equations (table 3) to yield weighted peak-flow estimates cross peak-flow regional boundaries may be made by first (table 2). As the number of years of record becomes large, the determining the percentage of the basin in each region. Peak- weighted peak-flow estimate approaches the station peak-flow flow estimates are then computed for the entire basin drainage estimate. area by using the appropriate equation for each peak-flow 14 Peak-Flow Characteristics of Virginia Streams
region, then multiplying the peak flow for each part of the Cu = correction factor ratio from the previous basin by the percentage of the entire basin in that region, and equation; summing the contributions from each peak-flow region. Q(p)a(ungaged) = adjusted peak-flow estimate for the ungaged Peak-flow estimates at an ungaged site located on a gaged site for flow probability, p; and stream, where the drainage area of the ungaged site is between Q(p)r(ungaged) = regression peak-flow estimate for the 50 and 150 percent of the drainage area at the gaged site, ungaged site for flow probability,p . may be adjusted using the following method (Hannum, 1976; Glatfelter, 1984; Bisese, 1995). As the difference in drainage area between the gaged and 1. Estimate the peak flow at the ungaged site using one ungaged sites approaches 50 percent or 150 percent of the of the methods previously described. drainage area of the gaged site, the correction factor for the ungaged site approaches 1, and the adjusted value approaches 2. Compute a correction factor for the gaged site as the regression estimate for the ungaged site. follows:
Q C = ()(p w gaged ), Examples of Calculating Peak-Flow g Q (p )( r gaged ) (7) Estimates where The following four exercises provide step-by-step
Cg = the correction factor for the gaged site; examples of how to perform calculations and apply the
Q(p)w(gaged) = the weighted peak-flow estimate at the gaged methods suggested in this report to estimate peak flows. site for exceedance probability, p, from Example calculations are shown for estimating peak flows table 2 and by (1) using the regression equations provided in this report,
Q(p)r(gaged) = the regional regression peak-flow estimate at (2) using the drainage-area ratio method when a drainage the gaged site for exceedance probability, basin spans two or more peak-flow regions, (3) using a nearby p, computed from the equations listed in gage for an ungaged site, and (4) using a gaged site. table 3. 3. Compute a correction factor for the ungaged site as Use of Regression Equations follows: Example 1. Estimating 0.02-probability (50-year) peak 2 AA− flow at an ungaged site on a stream with a drainage basin gu CCug=−−(Cg1,) completely contained within the Valley and Ridge region. A g (8) Given: Drainage area (DA) of 0.80 mi2 for this basin, measured from a 1:24,000-scale topographic map. where
Cu = the correction factor for the ungaged site; Solution: The regression estimate for the site is com- puted using the appropriate equation in table 3 for the Cg = the correction factor for the gaged site, from the previous equation; 0.02-probability (50-year) discharge within the Valley and Ridge region as follows: Ag = the drainage area at the gaged site;
Au = the drainage area at the ungaged site; and Log10(Q )=+• 2.862 0.626 Log10(0.80) AAgu− = the absolute value of the difference between (0.02) the drainage area of the gaged site and the Log10(Q(0.02) )= 2.801 drainage area of the ungaged site. 2.801 Q(0.02) = 10 = 633 cubic feet per second. (10) 4. Estimate the adjusted peak flow at the ungaged site as follows:
(9) Drainage-Area Ratio Method Q()(p a ungaged )= CQ u ()( p r ungaged ), where Example 2. Estimating the 0.01-probability (100-year) peak flow at an ungaged site on a stream with a drainage basin that spans the Piedmont and Blue Ridge regions. Summary 15
Given: Estimate the adjusted peak flow at the ungaged site as 1. Drainage area (DA) of 7.6 mi2 for the entire basin, follows (eq 9): measured from a 1:24,000-scale topographic
map. Q()(p a ungaged )= CQ u ()( p r ungaged ), 2. Thirty-seven percent of the basin is located in the Piedmont region, and the remaining 63 percent of = 1.004 • 10 (equation result from table 3 for the basin lies within the Blue Ridge region. the ungaged site as a superscript) Solution: Calculate the 0.01-probability (100-year) peak = 1.004 • 104.267 flow for the basin using the Piedmont and Blue Ridge = 18,577 cubic feet per second. regional regression equations from table 3, then multiply each by the fraction of the drainage area in each region Gaged Site to compute a final estimate, as follows:
For the Piedmont region: Example 4. Estimating the 100-year peak-flow at a gaged site on the North Fork of the Rivanna River at Log10(Q )=+• 3.157 0.490 Log10(7.6) = 3.589 Route 606 near Earlysville, Virginia (station number (0.01 Piedmont) 02032640). 3.589 Q(0.01 Piedmont) = 10 = 3,878 cubic feet per second. (11) Given: Because this is a gaged site, the 100-year peak-flow may be read directly from table 2 (Peak-flow For the Blue Ridge region: frequency estimates for streamgaging stations in Virginia).
Log10(Q(0.01 Blue Ridge) )=+• 3.184 0.593 Log10(7.6) = 3.706 Solution: In table 2, find station number 02032640 in 3.706 the left hand column, identifying the gage on the North Q(0.01 Blue Ridge) =10 = 5,085 cubic feet per second. (12) Fork of the Rivanna River at Route 606 near Earlysville, Virginia. Read across to find the peak-flow discharge of The combined estimate for the basin: 49,710 cubic feet per second (ft3/s) corresponding to the annual exceedance probability of 0.01 (100-year recur- 3 rence interval): Q(100) = 49,710 ft /s. Q(0.01 combined) =(3,878 •+ 0.37) 5,085 • 0.63) = 4,639 cubic feet per second. (13) Summary
Understanding peak water flows in Virginia streams is Ungaged Site with Nearby Gage essential to human safety and sound management of water resources and associated riparian and watershed ecosystems. Example 3. Estimating the 0.10-probability (10-year) Meaningful characterizations of the magnitude and frequency peak flow at an ungaged site on the New River, located of peak flows provide valuable insights into the dynamics and upstream from New River streamgage number 03164000 variability of water movement through these unique stream near Galax, Virginia, in the Blue Ridge region. systems. This report summarizes a statistical analysis of peak-flow data collected in Virginia from 1895 through 2007. Given: Peak-flow values for annual exceedance probability estimates 1. Drainage area (A ) of 275 mi2 for the basin above u of 0.5, 0.4292, 0.2, 0.1, 0.04, 0.02, 0.01, 0.005, and 0.002 are the ungaged site, measured from a 1:24,000-scale summarized for 476 streamgaging stations, and regression topographic map. equations organized by physiographic region are presented for 2. Drainage area (A ) of 1,141 mi2 for the basin above g estimating annual exceedance probability peak flows using the gaged site, from table 2. basin characteristics. Solution: The drainage area of the ungaged site is Streamgaging stations with at least 10 years of peak-flow 24 percent of the drainage area at the gaged site. Using record were identified as study candidates. All of these streamgaging stations were considered, including those in pre- eq 7, the correction factor ratio for the gaged site (Cg ) is 0.992. dominately urban and predominately rural basins. Data from each candidate streamgaging station were quality checked to
The correction factor ratio for the ungaged (Cu ) site is identify numerical errors. Each list of datapoints was individu- determined using eq 8 and is 1.004. ally evaluated to discover and segregate intervals in the record 16 Peak-Flow Characteristics of Virginia Streams in which concomitant effects such as data of poor quality or Acknowledgments severely altered or regulated flows negatively affected the candidate data. Remaining datapoints in each dataset were The authors extend their thanks to the Virginia Depart- evaluated for evidence of trends. Statistics were generated to ment of Transportation, whose continued collaboration and identify monotonic, non-monotonic, linear, and non-linear cor- assistance, especially with collection and compilation of relation, including (1) Kendall’s Tau, (2) an index of Kendall’s peak-flow data for Virginia streams, made this report possible. trend probability, and (3) Spearman’s rho. Other statistical We also extend special thanks to the following individu- analyses performed include (4) calculating and plotting a lin- als for their exceptional and energetic guidance, work, advice, ear regression of each dataset with time, (5) plotting residuals review, and editing as information was compiled and this to help identify any significant correlation or autocorrelation, report was prepared: Donald C. Hayes, George E. Harlow, Jr., and (6) performing runs tests to identify non-linear change Theodore B. Samsel, and Robert B. Banks of the U.S. Geo- over time. Of the 589 candidate datasets considered for study, logical Survey. 113 were removed from consideration because they either had too few datapoints available for analysis, or they characterized streams with excessively regulated flow. Thirty-five of the remaining 476 sites were partially censored prior to analysis References due to indications of excessively regulated flow or peak flows measured below the gage base. Aitchison, J., and Brown, J.A.C., 1957, The lognormal dis- Regional regression analyses of peak-flow response tribution, with special reference to its uses in economics: associated with explanatory basin characteristics provide Cambridge, U.K., Cambridge University Press, 176 p. insights into the nature of peak flows across Virginia. Regional regression equations describing peak flow as a function Belsley, D.A., Kuh, E., and Welsch, R.E., 1980, Regression of basin drainage area are identified within each of the six diagnostics: New York, John Wiley and Sons, 292 p. physiographic regions delineated for study. Regression equations describing peak-flow annual exceedance probability Benson, M.A., 1962, Factors influencing the occurrence of as a function of basin drainage area in the Coastal Plain, floods in a humid region of diverse terrain: U.S. Geological Piedmont, Mesozoic Basins, Blue Ridge, Valley and Ridge, Survey Water-Supply Paper 1580–B, 64 p. and Appalachian Plateaus physiographic regions yielded Benson, M.A., 1964, Factors affecting the occurrence of floods median pseudo R-square values of 0.87, 0.91, 0.81, 0.94, 0.88, in the southwest: U.S. Geological Survey Water-Supply and 0.88, respectively. These same equations yielded median Paper 1580–D, 72 p. standard error of prediction values of 58 percent, 37 percent, 43 percent, 28 percent, 31 percent, and 0.34 percent, and Berenbrock, C., 2002, Estimating the magnitude of peak median standard model error values of 53 percent, 35 percent, flows at selected recurrence intervals for streams in Idaho: 40 percent, 26 percent, 29 percent, and 0.31 percent, U.S. Geological Survey Water-Resources Investigations respectively. Pseudo R-square is used to evaluate the final Report 02–4170, 59 p. models developed using GLS. The standard error of prediction expresses AVP as a percentage of the predicted value. The Bisese, J.A., 1995, Methods for estimating magnitude and standard model error expresses variance in model accuracy as frequency of peak discharges of rural, unregulated streams a percentage of the predicted value. Four example calculations in Virginia: U.S. Geological Survey Water-Resources Inves- are presented in the report as an aid in applying recommended tigations Report 94–4148, 70 p. methods for estimating peak flows at ungaged sites, including Burnham, K.P., and Anderson, D.R., 2002, Model selection the use of regional regression model equations. Results of this and inference—A practical information-theoretic approach: study supersede published results in previous studies of peak New York, Springer-Verlag, 488 p. flows in Virginia. Cohn, T.A., Lane, W.L., and Stedinger, J.R., 2001, Confidence intervals for expected moments algorithm flood quantile estimates: Water Resources Research, v. 37, no. 6, p. 1695– 1706. Cook, R.D., and Weisberg, S., 1982, Residuals and influence in regression: New York, Chapman and Hall, 229 p. Cushing, E.M., Kantrowitz, I.H., and Taylor, K.R., 1973, Water resources of the Delmarva Peninsula: U.S. Geologi- cal Survey Professional Paper 822, 58 p. References 17
Dicken, C.L., Nicholson, S.W., Horton, J.D., Kinney, S.A., Hayes, D.C., and Nelms, D.L., 2001, Base-flow characteris- Gunther, G., Foose, M.P., and Mueller, J.A.L., 2005, tics of streams in the Valley and Ridge, Blue Ridge, and Preliminary integrated geologic map databases for the Piedmont physiographic provinces of Virginia and other United States—Delaware, Maryland, New York, Penn- mid-Atlantic States [abs.], in Adams, D.B., Burke, Katrina, sylvania, and Virginia: U.S. Geological Survey Open-File Hemingway, Bruce, Key, Jeff, and Yurewicz, Michael, Report 2005–1325, 48 p. (Also available at http://pubs.usgs. comps., U.S. Geological Survey Appalachian Region Inte- gov/of/2005/1325/.) grated Science Workshop proceedings, Gatlinburg, Tennes- see, October 22–26, 2001: U.S. Geological Survey Open- Dillow, J.A., 1996, Technique for estimating magnitude and File Report 01–406, p. 87–88. frequency of peak flows in Maryland: U.S. Geological Sur- vey Water-Resources Investigations Report 95–4154, 55 p. Hayes, D.C., and Wiegand, U., 2006, Drainage areas of selected streams in Virginia: U.S. Geological Survey Open- Edwards, L.E., Barron, J.A., Bukry, David, Bybell, L.M., File Report 2006–1308, 51 p. Cronin, T.M., Poag, C.W., Weems, R.E., and Wingard, G.L., 2005, Paleontology of the upper Eocene to Quater- Hayes, D.C., and Young, R.L., 2005, Comparison of peak nary postimpact section in the USGS-NASA Langley core, discharge and runoff characteristic estimates from the ratio- Hampton, Virginia, chap. H of Horton, J.W., Jr., Powars, nal method to field observations for small basins in central D.S., and Gohn, G.S., eds., Studies of the Chesapeake Bay Virginia: U.S. Geological Survey Scientific Investigations impact structure—The USGS-NASA Langley corehole, Report 2005–5254, 44 p. Hampton, Virginia, and related coreholes and geophysical surveys: U.S. Geological Survey Professional Paper 1688, Helsel, D.R., and Hirsch, R.M., 2002, Statistical methods in p. H1–H47, 9 fossil plates, 2 oversize figures. water resources: U.S. Geological Survey Techniques of Water-Resources Investigations Report, book 4, chap. A3, Eng, Ken, Chen, Y.-Y., and Kiang, J.E., 2009, User’s guide to 510 p. the weighted-multiple-linear regression program (WREG version 1.0): U.S. Geological Survey Techniques and Meth- Hirsch, R.M., Slack, J.R., and Smith, R.A., 1982, Techniques ods, book 4, chap. A8, 21 p., accessed March 3, 2011, at of trend analysis for monthly water quality data: Water http://pubs.usgs.gov/tm/tm4a8/. Resources Research, v. 18, no. 1, p. 107–121. Fenneman, N.M., 1938, Physiography of Eastern United Homer, C., Huang, C., Yang, L., Wylie, B., and Coan, M., States: New York, McGraw-Hill, 714 p. 2004, Development of a 2001 National Land-Cover Data- base for the United States: Photogrammetric Engineering Fenneman, N.M., and Johnson, D.W., 1946, Physiographic and Remote Sensing, v. 70, no. 7, p. 829–840. divisions of the conterminous U.S.: U.S.Geological Survey map product, scale 1:7,000,000. (Also available at http:// Interagency Advisory Committee on Water Data, 1982, Guide- water.usgs.gov/GIS/metadata/usgswrd/XML/physio.xml.) lines for determining flood flow frequency: Water Resources Council Bulletin 17B, 28 p. Fichter, L.S., and Baedke, S.J., 1999, A description of the geology of Virginia, accessed June 22, 2010, at http:// Jennings, M.E., and Benson, M.A., 1969, Frequency curves csmres.jmu.edu/geollab/vageol/vahist/PhysProv.html. for annual flood series with some zero events or incomplete data: Water Resources Research, v. 5, no. 1, p. 276–280. Flynn, K.M., Kirby, W.H., and Hummel, P.R., 2006, User’s manual for program PeakFQ annual flood-frequency analy- Kirby, W., 1980, Computer routines for probability distribu- sis using Bulletin 17B guidelines: U.S. Geological Survey tions, random numbers, and related functions: U.S. Geologi- Techniques and Methods, book 4, chap. B4, 42 p. cal Survey Open-File Report 80–448, 61 p. Glatfelter, D.R., 1984, Techniques for estimating magnitude Lane, E.W., and Lei, K., 1950, Stream flow variability: Trans- and frequency of floods in Indiana: U.S. Geological Survey actions of the American Society of Civil Engineers, v. 115, Water-Resources Investigations Report 84–4134, 110 p. p. 1084–1134. Hannum, C.H., 1976, Techniques for estimating magnitude Langbein, W.B., and Iseri, K.T., 1995, General introduction and frequency of floods in Kentucky: U.S. Geological Sur- and hydrologic definitions, manual of hydrology—Part 1. vey Water-Resources Investigations Report 76–62, 70 p. General surface-water techniques: U.S. Geological Survey Water-Supply Paper 1541–A, 29 p. (Also available at http:// Hayes, D.C., 1991, Low-flow characteristics of streams in water.usgs.gov/wsc/glossary.html.) Virginia: U.S. Geological Survey Water-Supply Paper 2374, 69 p. 18 Peak-Flow Characteristics of Virginia Streams
Lumb, A.M., Kittle, J.L., Jr., and Flynn, K.M., 1990, Users Ries, K.G., III, and Friesz, P.J., 2000, Methods for estimating manual for ANNIE, computer program for interactive low-flow statistics for Massachusetts streams: U.S. Geologi- hydrologic analysis and data management: U.S. Geological cal Survey Water-Resources Investigations Report 00–4135, Survey Water-Resources Investigations Report 89–4080, 81 p. 236 p. Sall, J., 1990, Leverage plots for general linear hypotheses: Lynch, D.D., 1987, Hydrologic conditions and trends in The American Statistician, v. 44, no. 4, p. 308–315. Shenandoah National Park, Virginia: U.S. Geological Sur- vey Water-Resources Investigations Report 87–4131, 115 p. Smith, R.W., 1981, Rock type and minimum 7-day/10-year flow in Virginia streams: Virginia Water Resources Research Miller, E.M., 1969, Floods in Virginia, magnitude and fre- Center Bulletin 116, 43 p. quency: U.S. Geological Survey Open-File Report, 54 p. Speer, P.R., and Gamble, C.R., 1964a, Magnitude and fre- Miller, E.M., 1978, Technique for estimating magnitude and quency of floods in the United States—Part 2A, South frequency of floods in Virginia: U.S. Geological Survey Atlantic slope basins, James River to Savannah River: Water-Resources Investigations Report 78–5, 83 p. U.S. Geological Survey Water-Supply Paper 1673, 329 p. Mixon, R.B., Berquist, C.R., Jr., Newell, W.L., Johnson, Speer, P.R., and Gamble, C.R., 1964b, Magnitude and fre- G.H., Powars, D.S., Schindler, J.S., and Rader, E.K., 1989, quency of floods in the United States—Part 3B, Cumber- Geologic map and generalized cross sections of the Coastal land and Tennessee River basins: U.S. Geological Survey Plain and adjacent parts of the Piedmont, Virginia with Water-Supply Paper 1676, 340 p. generalized geologic cross sections: U.S. Geological Survey Miscellaneous Investigations Map I–2033, scale 1:250,000. Speer, P.R., and Gamble, C.R., 1965, Magnitude and fre- quency of floods in the United States—Part 3A, Ohio River Mosteller, F., and Tukey, J.W., 1977, Data analysis and basin except Cumberland and Tennessee River basins: regression—A second course in statistics: Reading, Massa- U.S. Geological Survey Water-Supply Paper 1675, 630 p. chusetts, Addison-Wesley, 588 p. Stedinger, J.R., and Tasker, G.D., 1985, Regional hydrologic National Oceanic and Atmospheric Administration, 2007, analysis 1—Ordinary, weighted, and generalized least National Weather Service Hydrometeorological Design squares compared: Water Resources Research, v. 21, no. 9, Studies Center, precipitation frequency data server, accessed p. 1421–1432. January 27, 2009, at http://dipper.nws.noaa.gov/hdsc/pfds/. Stedinger, J.R., and Thomas, W.O., Jr., 1985, Low-flow Nelms, D.L., Harlow, G.E., Jr., and Hayes, D.C., 1997, Base- frequency estimation using base-flow measurements: flow characteristics of streams in the Valley and Ridge, the U.S. Geological Survey Open-File Report 85–95, 22 p. Blue Ridge, and the Piedmont Physiographic Provinces of Virginia: U.S. Geological Survey Water-Supply Paper 2457, Tasker, G.D., 1975, Combining estimates of low-flow char- 48 p., 1 pl. acteristics of streams in Massachusetts and Rhode Island: Journal of Research of the U.S. Geological Survey, v. 3, Nuckels, E.H., 1970, Virginia streamflow data program analy- no. 1, p. 107–112. sis: U.S. Geological Survey Open-File Report, 54 p. Tasker, G.D., and Stedinger, J.R., 1989, An operational GLS Paybins, K.S., 2008, Basin characteristics for selected stream- model for hydrologic regression: Journal of Hydrology, flow-gaging stations in and near West Virginia: U.S. Geo- v. 111, p. 361–375. logical Survey Open-File Report 2008–1087, 9 p. (Also available at http://pubs.usgs.gov/of/2008/1087/.) The College of William & Mary Department of Geology, 2010, The geology of Virginia, accessed June 22, 2010, at PRISM Climate Group, Oregon State University, 2007, http://web.wm.edu/geology/virginia/. Mean annual precipitation from 1971 to 2000 and average monthly rainfall for January, February, and March, accessed Tice, R.H., 1954, Magnitude and frequency of floods in the May 5, 2008, at http://prism.oregonstate.edu/products/ Shenandoah Valley of Virginia: U.S. Geological Survey matrix.phtml. Open-File Report, 33 p. Prugh, B.J., Jr., Nuckels, E.H., and Humphreys, C.G., 1991, Trainer, F.W., and Watkins, F.A., Jr., 1975, Geohydro- Annual maximum stages and discharges of selected streams logic reconnaissance of the upper Potomac River basin: in Virginia through 1990: U.S. Geological Survey Open-File U.S. Geological Survey Water-Supply Paper 2035, 68 p. Report 90–587, 442 p. References 19
U.S. Department of Agriculture, 2007, U.S. General Soil Map Wetzel, K.L., and Bettandorff, J.M., 1986, Techniques for esti- (STATSGO2) for Virginia, prepared by the soil survey staff mating streamflow characteristics in the eastern and interior of the Natural Resources Conservation Service, accessed coal provinces of the United States: U.S. Geological Survey during 2007 at http://soildatamart.nrcs.usda.gov. Water-Supply Paper 2276, 80 p. U.S. Geological Survey, 2006, National hydrologic dataset, Yang, L., Huang, C., Homer, C.G., Wylie, B.K., and Coan, accessed during 2007 at http://nhdgeo.usgs.gov/viewer.htm. M.J., 2002, An approach for mapping large-area impervi- ous surfaces—Synergistic use of Landsat 7 ETM+ and high U.S. Geological Survey, 2007, National elevation dataset, spatial resolution imagery: Canadian Journal of Remote accessed during 2007 at http://seamless.usgs.gov. Sensing, v. 29, no. 2, p. 230–240. 20 Peak-Flow Characteristics of Virginia Streams
Glossary
[Unless otherwise noted, definitions are based on Langbein, W.B., and Iseri, K.T, 1995, Hydrologic definitions, available at USGS Web site http://water.usgs.gov/wsc/glossary.html]
Bankfull stage The elevation at which the active channel meets the actively forming floodplain in the current climatic regime. It is the stage at which the stream first overflows its natural banks formed by floods with 1- to 3-year recurrence intervals.
Cubic feet per second (ft3/s) A measure of the rate of water discharge representing a volume of 1 cubic foot of water passing a given point in 1 second.
Discharge The volume of water that passes a given point within a given period of time.
Drainage area The area measured in a horizontal plane and enclosed by a topographic divide from which direct surface runoff from precipitation normally drains by gravity into a stream, upstream from a specified location.
Gage A water-level measuring device at a streamflow-gaging station.
Gage height The water-surface elevation referred to an arbitrary gage datum. Gage height is often used interchangeably with the more general term stage, although gage height is more appropriate when used with a reading on a gage.
Historic peak A peak-flow measurement collected outside the systematic period of record of data collection. Generally a high- magnitude peak of a noteworthy flood.
Hydrologic unit A geographic area representing part or all of a surface-water drainage basin or distinct hydrologic feature as delineated on a State Hydrologic Unit Map prepared by the U.S. Geological Survey.
Location A description of the placement of a streamflow-gaging station. Location may include the latitude, longitude, datum, county, and hydrologic unit code of the station.
Regulation The artificial manipulation of the flow of a stream.
Remarks Additional information enriching the characterization of a streamflow-gaging station.
Stage-discharge relation The relation between gage height and the rate at which water flows in a stream. It is defined by mea- surements of stage and discharge, by theoretical assumptions based on hydraulic properties of the stream channel or manmade flow-confining structures, or by a combination of both.
Streamgaging or streamflow-gaging station A particular site on a stream, canal, lake, or reservoir where systematic observa- tions of water heights and water discharges are made.
Water year The 12-month period from October 1 through September 30. The date of the water year is designated by the calen- dar year in which the period ends and which includes 9 of the 12 months. A water year beginning October 1, 2005, and ending September 30, 2006, is called the “2006 water year.” Table 2 21 ------500 0.002 267 489 1,523 6,982 6,780 3,654 1,453 21,980 -- -- 200 0.005 210 721 337 5,695 6,130 5,909 4,198 5,966 5,317 3,368 2,974 6,382 4,051 1,133 4,909 17,160 13,404 15,333 -- -- 100 0.01 172 553 277 925 2,511 4,801 5,033 4,928 2,860 4,896 4,202 2,733 5,245 3,509 4,013 11,180 14,020 12,500 -- -- 50 0.02 138 419 224 743 4,112 3,971 4,056 1,904 3,998 3,342 9,265 2,208 2,089 4,288 3,014 3,265 11,270 10,095 /s) 3 -- -- 25 0.04 109 305 174 584 3,203 3,253 3,236 1,228 3,160 2,614 8,876 7,483 7,986 1,720 1,705 3,396 2,523 2,568 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 74.9 117 191 643 405 2,280 2,269 2,272 2,203 1,817 6,170 5,379 5,614 1,173 1,248 2,373 1,885 1,776 -- -- 5 0.2 52.9 79.7 125 362 818 933 289 1,643 1,621 1,626 1,571 1,289 4,418 3,963 4,084 1,697 1,401 1,258 ------31.4 2.33 0.4292 986 982 983 161 950 743 478 605 866 176 752 2,706 2,515 2,568 1,031 ------2 0.5 27.3 857 858 858 131 830 635 414 539 901 757 155 655 2,378 2,222 2,267
) 1.9 1.9 1.9 2 5.89 5.89 5.89 11 11 15.9 15.9 15.9 15.2 15.2 15.2 58.2 58.2 58.2 17 17 17 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 dox, Va. dox, Va. dox, Va. Va. Va. Va. phens City, Va. phens City, Va. phens City, Va. ryville, Va. ryville, Va. ryville, Va. Wi n c h e s t e r, Va . Wi n c h e s t e r, Va . Wi n c h e s t e r, Va . Wi n c h e s t e r, Va . Wi n c h e s t e r, Va . Wi n c h e s t e r, Va . ryville, Va. ryville, Va. Guy Creek at Route 606 near Nassawa Guy Creek at Route 606 near Nassawa Guy Creek at Route 606 near Nassawa Hogue Creek at Route 614 near Hayfield, Hogue Creek at Route 614 near Hayfield, Hogue Creek at Route 614 near Hayfield, near Ste Opequon Creek at Route 11 near Ste Opequon Creek at Route 11 near Ste Opequon Creek at Route 11 Opequon Creek above Route 7 near Ber Opequon Creek above Route 7 near Ber Opequon Creek above Route 7 near Ber Abrams Creek at railroad bridge Abrams Creek at railroad bridge Abrams Creek at railroad bridge Abrams Creek above Route 659 near Abrams Creek above Route 659 near Abrams Creek above Route 659 near Dry Marsh Run at Route 645 near Ber Dry Marsh Run at Route 645 near Ber (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01484800 01484800 01484800 01613900 01613900 01613900 01614830 01614830 01614830 01615000 01615000 01615000 01615500 01615500 01615500 01616000 01616000 01616000 01616100 01616100 Table 2. Table [mi 22 Peak-Flow Characteristics of Virginia Streams ------500 0.002 4,886 3,876 17,040 10,720 12,800 ------200 0.005 256 2,224 6,450 8,358 8,839 8,869 5,750 7,034 3,737 4,559 2,955 3,210 4,882 3,068 11,490 15,367 10,157 ------100 0.01 197 1,958 8,388 5,301 6,367 7,575 8,837 6,619 4,716 5,428 3,016 3,721 4,260 2,386 2,603 3,990 2,493 12,851 ------50 0.02 152 1,718 6,019 4,335 4,858 6,430 7,638 4,857 3,848 4,187 2,404 3,024 3,320 1,909 2,101 3,247 2,014 10,677 /s) 3 ------25 0.04 111 1,470 4,220 3,434 3,650 5,389 8,655 6,496 3,486 3,039 3,171 1,884 2,373 2,602 1,508 1,634 2,553 1,584 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 68.3 2,115 1,112 1,126 2,506 2,400 2,425 4,149 6,253 5,030 2,141 2,121 1,315 1,637 1,848 1,075 1,766 1,100 ------5 0.2 43.0 842 957 804 774 782 1,585 1,718 1,690 3,287 4,633 3,918 1,393 1,507 1,481 1,156 1,325 1,250 ------21.6 2.33 0.4292 501 840 997 766 909 875 614 688 828 545 451 747 476 1,044 2,368 2,964 2,652 ------2 0.5 18.1 431 715 913 865 659 794 760 549 599 688 496 391 651 420 2,178 2,623 2,386
) 2 9.73 9.73 9.73 5.44 5.44 5.44 11 17.3 17.3 17.3 73 73 73 14.3 14.3 14.3 10.9 10.9 10.9 0.082 0.082 0.082 (mi area Drainage - - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 ryville, Va. Stokesville, Va. Stokesville, Va. Stokesville, Va. n e a r S p r i n g C r e e k ,n e Va a . r S p r i n g C r e e k ,n e Va a . r S p r i n g C r e e k ,Springs, Va . Va. Springs, Va. Springs, Va. Clinton, Va. Clinton, Va. Clinton, Va. burg, Va. burg, Va. burg, Va. Dry Marsh Run at Route 645 near Ber North River above Forest Road near North River above Forest Road near North River above Forest Road near Briery Branch tributary at Route 257 Briery Branch tributary at Route 257 Briery Branch tributary at Route 257 Dry River at Route 847 Rawley Dry River at Route 847 Rawley Dry River at Route 847 Rawley Muddy Creek at Route 726 Mount Muddy Creek at Route 726 Mount Muddy Creek at Route 726 Mount W a r B r a W a n r c h B r a a t W a n r c R h o B u r a t a B t e l n a c R 3 c h o 3 k u s a t n B t R e e l u a a n R 3 r c o 3 k a u s H t t n i B R e H e n l u a a t a n r 3 r o c r 3 k n a i s H t , s Blacks Run at Route 726 Harrison n i o R H e n n V u a a b a t n r . u r o r r n a i g H t , s , i o H n Va n V a a b t . r . u o r r n i g Blacks Run at Route 726 Harrison , s , o n Va V a b . . u r g , Va . Blacks Run at Route 726 Harrison (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01616100 01620500 01620500 01620500 01620800 01620800 01620800 01621000 01621000 01621000 01621050 01621050 01621050 01621200 01621200 01621200 01621400 01621400 01621400 01621410 01621410 01621410 Table 2. Table [mi Table 2 23 ------500 0.002 732 457 194 492 40,040 126,500 -- -- 200 0.005 506 908 361 166 797 371 724 908 659 703 532 609 6,781 1,512 86,180 41,289 61,162 13,930 -- -- 100 0.01 378 718 298 146 629 296 570 718 522 614 456 493 5,580 1,207 6,014 63,720 35,216 46,897 -- -- 50 0.02 279 566 242 961 128 495 234 448 566 414 533 385 397 4,567 2,481 46,510 29,790 36,049 /s) 3 -- -- 25 0.04 110 202 426 194 733 371 182 335 964 426 320 447 309 305 3,623 33,380 24,790 27,686 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 89.1 128 276 138 485 239 126 215 242 276 217 331 202 2,537 20,740 18,599 19,224 ------5 0.2 86.2 73.6 91.4 72.0 183 102 327 158 141 183 239 1,819 13,810 14,332 14,190 ------51.0 98.8 65.6 56.4 84.5 59.0 75.2 13.5 98.8 2.33 0.4292 182 1,109 8,031 9,728 9,229 ------8.90 2 0.5 44.8 84.2 58.5 52.7 71.9 52.9 63.9 84.2 970 157 7,039 8,722 8,204
) 2 0.67 0.67 0.67 1.56 1.56 1.56 0.54 0.54 0.54 0.46 0.46 0.46 0.67 0.67 18.8 18.8 18.8 376 376 376 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Harrisonburg, Va. Harrisonburg, Va. Harrisonburg, Va. Crawford, Va. Crawford, Va. Crawford, Va. town, Va. town, Va. town, Va. M t . C r a w f o r d , Va . M t . C r a w f o r d , Va . M t . C r a w f o r d , Va . n e a r A u g u s t a S p r in n e g a s r , A Va u . g u s t a S p r in n e g a s r , A Va u . g u s t a S p r in n e g a r s , C h Va r i . s t i a n , Va . n e a r C h r i s t i a n , Va . n e a r C h r i s t i a n , Va . Staunton, Va. Staunton, Va. Blacks Run tributary 1 at Route 11 near Blacks Run tributary 1 at Route 11 near Blacks Run tributary 1 at Route 11 near Blacks Run tributary 1 at Route 11 Blacks Run at Route 704 near Mt. Blacks Run at Route 704 near Mt. Blacks Run at Route 704 near Mt. Burke near 693 Route along River North Burke near 693 Route along River North Burke near 693 Route along River North near North River tributary at Route 11 near North River tributary at Route 11 near North River tributary at Route 11 Branch tributary 1 at Route 42 Buffalo Branch tributary 1 at Route 42 Buffalo Branch tributary 1 at Route 42 Buffalo Branch tributary 2 at Route 42 Buffalo Branch tributary 2 at Route 42 Buffalo Branch tributary 2 at Route 42 Buffalo Bell Creek at St. Pauls Chapel, near Bell Creek at St. Pauls Chapel, near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01621450 01621450 01621450 01621470 01621470 01621470 01622000 01622000 01622000 01622100 01622100 01622100 01622300 01622300 01622300 01622400 01622400 01622400 01623000 01623000 Table 2. Table [mi 24 Peak-Flow Characteristics of Virginia Streams ------500 0.002 11,800 13,220 82,440 16,860 57,280 ------200 0.005 5,623 2,606 8,078 4,581 5,300 1,832 3,176 55,960 26,392 39,296 13,670 15,367 14,291 44,860 41,090 42,961 66,025 ------100 0.01 3,130 2,104 5,419 3,740 4,058 1,146 2,296 11,520 41,270 22,310 29,949 12,851 12,073 36,690 35,043 35,785 56,842 ------50 0.02 744 1,695 1,692 3,529 3,039 3,124 9,576 1,693 30,040 18,719 22,874 10,677 10,094 29,480 29,641 29,576 48,497 /s) 3 ------25 0.04 885 482 1,309 2,210 2,386 2,358 7,813 8,655 8,259 1,233 21,500 15,393 17,403 23,140 24,662 24,124 40,863 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 346 884 272 793 1,091 1,646 1,569 5,729 6,253 6,047 11,354 11,905 13,300 15,940 18,501 17,742 31,213 ------5 0.2 154 610 575 532 1,162 1,083 8,824 8,594 8,655 4,305 4,633 4,517 11,260 14,253 13,444 24,505 ------51.4 2.33 0.4292 351 227 692 617 5,107 5,680 5,518 2,824 2,964 2,914 6,696 9,671 8,810 17,105 ------2 0.5 39.2 303 178 602 528 4,472 5,062 4,888 2,526 2,623 2,587 5,828 8,671 7,806 15,433
) 2 0.67 3.85 3.85 3.85 9.81 9.81 9.81 73 73 73 40.8 179 179 179 373 373 373 819 819 819 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Staunton, Va. Staunton, Va. Staunton, Va. Staunton, Va. n e a r S t a u n t o n , Va . n e a r S t a u n t o n , Va . n e a r S t a u n t o n , Va . Va. Va. Va. Fishersville, Va. Fishersville, Va. Fishersville, Va. Va. Va. Va. lic, Va. lic, Va. lic, Va. Va. Bell Creek at St. Pauls Chapel, near Bell Creek along Route 612 near Bell Creek along Route 612 near Bell Creek along Route 612 near Bell Creek at Route 732 Franks Mill Bell Creek at Route 732 Franks Mill Bell Creek at Route 732 Franks Mill Verona, Middle River at Route 742 near Verona, Middle River at Route 742 near Verona, Middle River at Route 742 near Christians Creek at Route 794 near Christians Creek at Route 794 near Christians Creek at Route 794 near Middle River at Route 769 near Grottoes, Middle River at Route 769 near Grottoes, Middle River at Route 769 near Grottoes, North River at Route 659 Port Repub North River at Route 659 Port Repub North River at Route 659 Port Repub Back Creek at Route 624 Lyndhurst, (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01623000 01623500 01623500 01623500 01624000 01624000 01624000 01624300 01624300 01624300 01624800 01624800 01624800 01625000 01625000 01625000 01625500 01625500 01625500 01625900 Table 2. Table [mi Table 2 25 ------500 0.002 53,470 48,980 65,090 63,820 ------200 0.005 1,870 17,080 37,280 21,458 27,633 36,420 22,064 27,578 47,060 23,532 32,641 49,460 29,227 37,317 31,020 ------100 0.01 1,500 13,776 27,920 18,065 21,575 28,580 18,585 22,033 36,210 19,848 25,576 40,040 24,757 30,214 26,307 ------50 0.02 1,199 20,811 10,524 20,530 15,100 16,843 21,980 15,543 17,509 27,360 16,618 19,972 31,770 24,252 22,138 /s) 3 ------25 0.04 919 8,056 14,740 12,349 13,030 16,460 12,721 13,717 20,170 13,624 15,420 24,530 17,160 19,163 18,283 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 613 5,384 9,023 9,037 9,034 9,319 9,599 10,580 12,770 10,005 10,644 16,410 12,706 13,538 13,568 ------5 0.2 417 7,011 3,681 5,828 6,785 6,568 7,039 7,004 8,458 7,539 7,735 9,657 9,979 11,230 10,337 ------2.33 0.4292 236 4,110 2,145 3,144 4,429 3,850 4,579 4,416 4,675 4,948 4,884 6,309 6,421 6,396 6,897 ------2 0.5 203 1,858 2,686 3,936 3,608 3,281 4,072 3,884 4,009 4,404 4,306 5,398 5,731 5,652 6,161
) 2 2.22 2.22 2.22 40.8 40.8 127 127 127 133 133 133 148 148 148 212 212 212 234 234 234 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. boro, Va. boro, Va. boro, Va. R o a d a t Wa y n e s b o r oR , o a Va d . a t Wa y n e s b o r oR , o a Va d . a t Wa y n e s b o r oDooms, , Va . Va. Dooms, Va. Dooms, Va. Harriston, Va. Harriston, Va. Harriston, Va. Va. Va. Va. lic, Va. lic, Va. lic, Va. Back Creek at Route 624 at Lyndhurst, Back Creek at Route 624 Lyndhurst, Back Creek at Route 624 Lyndhurst, Waynes South River at Route 664 near Waynes South River at Route 664 near Waynes South River at Route 664 near South River (at Basic City) at Lyndhurst South River (at Basic City) at Lyndhurst South River (at Basic City) at Lyndhurst South River at Hopeman Parkway near South River at Hopeman Parkway near South River at Hopeman Parkway near South River tributary at Route 340 near South River tributary at Route 340 near South River tributary at Route 340 near South River at Route 778 Harriston, South River at Route 778 Harriston, South River at Route 778 Harriston, South River at Route 659 Port Repub South River at Route 659 Port Repub South River at Route 659 Port Repub (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01625900 01625900 01626000 01626000 01626000 01626500 01626500 01626500 01626850 01626850 01626850 01627300 01627300 01627300 01627500 01627500 01627500 01628000 01628000 01628000 Table 2. Table [mi 26 Peak-Flow Characteristics of Virginia Streams ------500 0.002 253 454 1,210 3,798 201,200 262,700 -- -- 200 0.005 975 215 752 354 900 388 549 2,871 1,499 2,139 2,821 3,696 3,296 77,967 90,121 149,600 110,016 191,600 134,262 -- -- 100 0.01 711 816 188 592 290 343 463 2,270 1,278 1,685 2,184 2,930 2,617 67,345 87,953 78,068 117,800 148,800 106,232 -- -- 50 0.02 672 163 466 234 561 299 388 1,617 1,027 1,187 1,632 2,108 1,931 91,350 57,633 70,017 66,986 83,806 113,800 /s) 3 -- -- 25 0.04 542 825 867 139 348 185 422 249 312 1,190 1,163 1,560 1,429 69,370 48,775 55,490 85,250 56,909 65,989 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 390 753 581 544 108 224 131 274 668 995 904 180 219 46,020 37,494 39,858 55,620 43,989 47,181 ------5 0.2 85.5 95.7 287 483 405 345 147 181 384 644 581 31,860 29,631 30,204 38,070 34,965 35,760 ------60.2 78.8 61.1 97.8 2.33 0.4292 181 255 231 180 177 345 310 18,860 20,890 20,321 22,340 24,865 24,156 ------2 0.5 54.7 67.0 54.4 83.3 160 215 198 151 177 292 270 16,490 18,889 18,181 19,500 22,526 21,630
) 3 3 3 2 1.95 1.95 1.95 1.18 1.18 1.18 0.49 0.49 0.49 0.66 0.66 0.66 (mi area 1,079 1,079 1,079 1,372 1,372 1,372 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 n e a r G r o t t o e s , Va . n e a r G r o t t o e s , Va . n e a r G r o t t o e s , Va . n e a r G r o t t o e s , Va . n e a r G r o t t o e s , Va . n e a r G r o t t o e s , Va . L o w e r L e w i sL o R w u e n r n L e e a w r i s L yL n o R n w u w e n o r o n d L e , e a w r V i a s L . yvideo, n R n u wVa. n o o n d e , a r V a L . yvideo, n n wVa. o o d , V a .video, Va. near Luray, Va. near Luray, Va. near Luray, Va. 2 11 n e a r L u r a y, Va . 2 11 n e a r L u r a y, Va . 2 11 n e a r L u r a y, Va . White Oak Run 0.15 miles above mouth White Oak Run 0.15 miles above mouth White Oak Run 0.15 miles above mouth Deep Run 0.5 miles above Route 708 Deep Run 0.5 miles above Route 708 Deep Run 0.5 miles above Route 708 South Fork Shenandoah River below South Fork Shenandoah River below South Fork Shenandoah River below Cub Run tributary at Route 33 Monte Cub Run tributary at Route 33 Monte Cub Run tributary at Route 33 Monte South Fork Shenandoah River tributary South Fork Shenandoah River tributary South Fork Shenandoah River tributary South Fork Shenandoah River at Route South Fork Shenandoah River at Route South Fork Shenandoah River at Route C h u b R u n C h n u e b a r R u S n C t h a n u n e b l a e r R y , u S n t Va a n . n e l a e r y , S t Va a . n l e y , Va . (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01628060 01628060 01628060 01628150 01628150 01628150 01628500 01628500 01628500 01628600 01628600 01628600 01629400 01629400 01629400 01629500 01629500 01629500 01629945 01629945 01629945 Table 2. Table [mi Table 2 27 ------500 94.9 0.002 6,616 3,306 86,820 50,210 24,920 263,300 200 80.7 0.005 603 5,608 6,470 2,221 4,033 3,141 11,408 11,586 67,350 29,060 45,412 32,260 17,916 19,190 17,852 18,461 195,100 100,136 141,757 100 70.8 0.01 473 4,907 9,159 5,661 9,635 1,616 3,284 2,526 13,311 86,926 54,750 24,613 36,131 22,720 15,470 14,974 15,177 153,300 113,501 50 61.5 0.02 370 4,254 6,887 4,827 7,964 9,942 1,154 2,662 2,037 74,730 90,508 43,780 20,688 28,455 15,720 12,220 12,474 12,382 118,500 /s) 3 25 52.7 0.04 803 276 3,642 5,225 4,063 6,407 7,372 2,083 1,609 9,408 9,916 89,680 63,666 72,009 34,260 17,056 22,057 10,640 10,152 Peak flow (ft Return period (years) Exceedance probability 10 0.1 41.7 471 176 2,886 3,449 3,082 6,024 4,580 4,864 1,430 1,126 6,277 7,377 7,088 59,160 49,410 52,082 23,580 12,626 15,236 5 0.2 33.7 115 294 798 5,211 2,339 2,324 2,333 9,594 3,679 3,355 3,415 1,005 4,296 5,498 11,127 40,730 39,439 39,769 16,740 24.7 60.4 2.33 0.4292 152 593 456 2,111 1,730 1,325 1,519 6,377 7,231 1,877 2,063 2,427 3,550 3,262 23,920 28,223 27,015 10,120 2 0.5 22.7 51.2 128 516 390 1,600 1,140 1,351 8,858 5,691 6,451 1,589 1,861 1,801 2,082 3,147 2,859 20,850 25,604 24,196
) 2 7.94 7.94 7.94 0.34 0.34 20.5 20.5 20.5 45.7 45.7 45.7 93.6 93.6 93.6 210 210 210 (mi area 1,634 1,634 1,634 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Echo, Va. Echo, Va. Echo, Va. R o u t e 6 1 9 a t F rR o o n u t t e R o 6 y 1 a 9 l , a t Va F . rR o o n u t t e R o 6 y 1 a 9 l , a t Va F . rR o o n u t t e R o 2 y 5 a 9 l , a t Va C .R o o o u t t e e s 2 S 5 t 9 o r a e t , C VaR o . o o u t t e e s 2 S 5 t 9 o r a e t , C VaBroadway, o . o t e s Va. S t o r e , VaBroadway, . Va. Broadway, Va. 2 5 9 n e a r B r o a d w a y,2 5 9 Va . n e a r B r o a d w a y,2 5 9 Va . n e a r B r o a d w a y,Market, Va . Va. Market, Va. Market, Va. Conicville, Va. Conicville, Va. Gooney Run at Route 622 near Glen Gooney Run at Route 622 near Glen Gooney Run at Route 622 near Glen South Fork Shenandoah River below South Fork Shenandoah River below South Fork Shenandoah River below North Fork Shenandoah River above North Fork Shenandoah River above North Fork Shenandoah River above Linville Creek below Route 786 at Linville Creek below Route 786 at Linville Creek below Route 786 at Long Meadow (Long Glade) at Route Long Meadow (Long Glade) at Route Long Meadow (Long Glade) at Route Smith Creek at Route 616 near New Smith Creek at Route 616 near New Smith Creek at Route 616 near New Crooked Run tributary at Route 42 near Crooked Run tributary at Route 42 near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01630700 01630700 01630700 01631000 01631000 01631000 01632000 01632000 01632000 01632082 01632082 01632082 01632300 01632300 01632300 01632900 01632900 01632900 01632950 01632950 Table 2. Table [mi 28 Peak-Flow Characteristics of Virginia Streams ------500 0.002 688 3,937 1,772 96,820 15,150 40,010 157,700 200 0.005 487 675 231 578 3,611 2,838 3,219 1,278 2,431 1,792 75,350 49,503 62,946 12,030 15,931 13,413 63,614 87,096 29,910 113,500 100 0.01 982 368 531 210 455 2,181 2,934 2,585 9,975 1,960 1,462 11,323 61,490 42,375 51,452 13,333 87,380 54,726 68,885 23,640 50 0.02 741 274 416 189 357 1,646 2,374 2,070 8,161 9,487 1,574 1,190 11,084 49,430 35,964 41,709 66,290 46,660 54,391 18,380 /s) 3 25 0.04 311 546 943 199 162 270 1,214 1,852 1,618 6,556 8,994 7,803 1,215 38,950 30,072 33,418 49,350 39,276 42,832 13,970 Peak flow (ft Return period (years) Exceedance probability 10 0.1 771 346 818 657 124 199 121 177 1,114 1,266 4,713 6,507 5,765 9,260 27,200 22,720 24,138 32,030 29,958 30,587 -- 5 0.2 81.2 86.9 513 885 782 230 563 461 130 3,491 4,828 4,329 6,382 19,620 17,634 18,207 21,920 23,485 23,043 -- 44.6 69.2 2.33 49.1 0.4292 287 520 453 128 323 261 2,260 3,096 2,779 3,733 12,220 12,099 12,136 12,970 16,357 15,323 -- 2 0.5 38.3 58.8 42.1 110 247 451 390 279 223 2,017 2,741 2,457 3,248 11,370 10,800 10,874 10,851 14,750 13,667
) 2 0.34 6.61 6.61 6.61 3.43 3.43 3.43 0.41 0.41 0.41 77.5 77.5 77.5 508 508 508 770 770 770 102 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Conicville, Va. Jackson, Va. Jackson, Va. Jackson, Va. 6 9 8 a t M t . J a c k s o n6 , 9 8 Va a . t M t . J a c k s o n6 , 9 8 Va a . t M t . J a c k s o nbia , VaFurnace, . Va. bia Furnace, Va. bia Furnace, Va. Va. Va. Va. C o l u m b i a F u r n a c e , C Va o . l u m b i a F u r n a c e , C Va o . l u m b i a F u r n a c e , 5 Va 5 . n e a r S t r a s b u r g ,5 Va 5 . n e a r S t r a s b u r g ,5 Va 5 . n e a r S t r a s b u r g ,Wi Va n . c h e s t e r, Va . Crooked Run tributary at Route 42 near Crooked Run at Route 263 near Mt. Crooked Run at Route 263 near Mt. Crooked Run at Route 263 near Mt. North Fork Shenandoah River at Route North Fork Shenandoah River at Route North Fork Shenandoah River at Route Stony Creek along Route 675 at Colum Stony Creek along Route 675 at Colum Stony Creek along Route 675 at Colum Woodstock, Pughs Run at Route 623 near Woodstock, Pughs Run at Route 623 near Woodstock, Pughs Run at Route 623 near Pughs Run tributary at Route 623 near Pughs Run tributary at Route 623 near Pughs Run tributary at Route 623 near North Fork Shenandoah River at Route North Fork Shenandoah River at Route North Fork Shenandoah River at Route Cedar Creek above Route 628 near (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01632950 01632970 01632970 01632970 01633000 01633000 01633000 01633500 01633500 01633500 01633650 01633650 01633650 01633700 01633700 01633700 01634000 01634000 01634000 01634500 Table 2. Table [mi Table 2 29 ------500 0.002 218 5,312 53,730 43,630 179,700 ------200 0.005 169 645 312 4,189 9,122 5,328 18,801 23,783 40,650 24,103 31,043 29,540 17,022 22,714 75,901 95,789 125,400 135,069 ------100 0.01 137 506 266 3,463 7,306 4,481 15,787 18,974 32,380 20,339 24,882 21,730 14,265 17,403 94,090 65,526 76,095 117,951 ------50 0.02 109 397 226 2,829 5,445 3,645 11,873 13,164 15,050 25,330 17,037 19,809 15,780 13,371 69,330 56,048 60,518 101,957 /s) 3 ------25 84.9 0.04 296 184 4,111 9,651 2,274 2,943 11,754 11,250 10,728 19,340 13,976 15,538 10,201 49,910 47,400 48,160 87,554 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 57.4 189 131 7,811 2,115 8,193 6,923 7,000 6,977 1,645 2,695 12,840 10,273 10,893 30,690 36,400 34,897 68,729 ------5 0.2 39.8 90.5 124 5,833 5,965 8,808 7,748 7,981 4,569 5,207 5,033 1,233 1,801 1,530 19,930 28,736 26,544 55,518 ------23.0 65.5 48.8 2.33 0.4292 821 938 3,778 3,766 5,065 5,093 5,086 2,621 3,352 3,140 1,015 10,850 20,226 17,614 40,445 ------2 0.5 20.0 55.6 41.2 740 870 821 3,352 3,324 4,378 4,534 4,495 2,289 2,971 2,764 9,294 18,282 15,629 36,838
) 2 0.38 0.38 0.38 86.5 86.5 86.5 14 14 14 46.9 102 102 154 154 154 (mi area 1,032 1,032 1,032 2,684 2,684 2,684 Drainage - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Wi n c h e s t e r, Va . Wi n c h e s t e r, Va . M i d d l e t o w n , Va . M i d d l e t o w n , Va . M i d d l e t o w n , Va . a t R o u t e 5 5 n ea a t r Wa R o t u e t r e l i 5 c 5 k , n e Vaa a . t r Wa R o t u e t r e l i 5 c 5 k , n e VaBuckton, a . r Wa t eVa. r l i c k , VaBuckton, . Va. Buckton, Va. r a i l r o a d n e a r R ir v a e i r l t r o o n a , d Va n . e a r R ir v a e i r l t r o o n a , d Va n . e a r R i v e r t o n , Va . Royal, Va. Royal, Va. Royal, Va. ton, Va. Cedar Creek above Route 628 near Cedar Creek above Route 628 near near Cedar Creek above Route 11 near Cedar Creek above Route 11 near Cedar Creek above Route 11 North Fork Shenandoah River tributary 1 North Fork Shenandoah River tributary 1 North Fork Shenandoah River tributary 1 Passage Creek above Route 55 near Passage Creek above Route 55 near Passage Creek above Route 55 near North Fork Shenandoah River along North Fork Shenandoah River along North Fork Shenandoah River along Va. Shenandoah River at Riverton, Va. Shenandoah River at Riverton, Va. Shenandoah River at Riverton, at Front Avenue Happy Creek at Kerfoot at Front Avenue Happy Creek at Kerfoot at Front Avenue Happy Creek at Kerfoot Crooked Run below Route 340 at River (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01634500 01634500 01635090 01635090 01635090 01635200 01635200 01635200 01635500 01635500 01635500 01636000 01636000 01636000 01636200 01636200 01636200 01636210 01636210 01636210 01636242 Table 2. Table [mi 30 Peak-Flow Characteristics of Virginia Streams ------500 0.002 1,305 2,692 40,570 40,570 ------200 0.005 5,297 1,188 8,003 1,423 7,332 2,173 8,930 3,628 11,768 32,990 14,703 20,615 25,610 12,236 15,082 ------100 0.01 9,790 4,216 1,100 6,400 1,335 6,042 1,824 7,150 3,157 9,832 11,839 11,379 24,040 15,482 17,600 ------50 0.02 8,094 3,076 1,013 4,746 1,236 4,953 1,508 5,325 2,646 8,991 7,413 8,197 11,177 11,740 17,140 /s) 3 ------25 0.04 925 6,515 2,294 3,572 1,137 3,937 1,223 4,018 2,205 6,860 8,060 7,520 5,633 5,944 11,870 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 806 991 888 4,659 1,479 2,333 2,765 2,632 1,648 6,863 4,563 5,026 3,819 3,726 3,740 ------5 0.2 970 710 854 661 3,415 1,552 1,989 1,758 1,221 4,192 3,103 3,291 2,049 2,517 2,457 ------2.33 0.4292 530 590 868 658 427 989 758 820 2,151 1,218 2,072 1,794 1,835 1,441 1,366 ------2 0.5 451 561 743 609 380 848 663 644 1,897 1,067 1,727 1,550 1,576 1,241 1,169
) 2 5.54 5.54 5.54 11.2 11.2 11.2 46.9 46.9 21.4 21.4 21.4 13.5 13.5 13.5 31.6 31.6 31.6 23.1 23.1 23.1 (mi area Drainage - - - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 ton, Va. ton, Va. Va. Va. Va. Royal, Va. Royal, Va. Royal, Va. Va. Va. Va. ville, Va. ville, Va. ville, Va. n e a r Wa t e r f o r d , Va . n e a r Wa t e r f o r d , Va . n e a r Wa t e r f o r d , Va . b r i d g e n e a r Wa t e rb f r o i r d d g , e Va n . e a r Wa t e rb f r o i r d d g , e Va n . e a r Wa t e r f o r d , Va . Crooked Run below Route 340 at River Crooked Run below Route 340 at River Manassas Run at Route 79 near Linden, Manassas Run at Route 79 near Linden, Manassas Run at Route 79 near Linden, Manassas Run at Route 645 near Front Manassas Run at Route 645 near Front Manassas Run at Route 645 near Front Spout Run at Route 621 near Millwood, Spout Run at Route 621 near Millwood, Spout Run at Route 621 near Millwood, Piney Run at Route 671 near Lovetts Piney Run at Route 671 near Lovetts Piney Run at Route 671 near Lovetts South Fork Catoctin Creek at Route 698 South Fork Catoctin Creek at Route 698 South Fork Catoctin Creek at Route 698 North Fork Catoctin Creek at Route 681 North Fork Catoctin Creek at Route 681 North Fork Catoctin Creek at Route 681 (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01636242 01636242 01636266 01636266 01636266 0163626650 0163626650 0163626650 01636316 01636316 01636316 01636690 01636690 01636690 01638350 01638350 01638350 01638420 01638420 01638420 Table 2. Table [mi Table 2 31 ------500 0.002 42,760 55,520 99,860 241,300 498,000 109,000 -- -- 200 0.005 6,512 33,050 27,074 29,958 12,004 40,760 32,467 36,416 12,513 69,940 16,408 30,925 18,604 33,968 77,880 58,398 129,800 256,700 -- -- 100 0.01 5,196 8,447 26,720 21,950 24,059 78,590 31,740 26,376 28,739 10,057 52,430 13,228 22,857 15,019 23,921 59,560 47,757 151,100 -- -- 50 0.02 3,822 5,602 7,589 11,512 21,190 17,074 18,702 45,890 24,260 20,663 22,100 38,490 10,089 16,224 86,170 16,342 44,850 38,284 /s) 3 -- -- 25 0.04 2,864 3,803 5,770 7,716 8,829 11,448 11,297 30,116 16,380 13,204 14,313 25,550 18,100 16,044 16,779 27,490 47,130 33,090 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 2,211 8,950 9,537 1,858 3,819 5,151 6,907 5,916 6,770 11,000 11,640 11,147 10,590 10,936 16,570 19,340 21,160 20,901 -- -- 5 0.2 4,411 7,576 6,220 6,545 4,768 1,227 1,368 7,793 7,650 7,687 2,582 3,516 8,788 4,057 4,354 10,470 14,270 14,932 -- -- 2.33 0.4292 679 714 2,411 2,411 4,323 3,718 3,839 1,506 4,360 4,618 4,562 1,480 5,394 2,045 2,910 2,376 8,239 9,307 -- -- 2 0.5 579 603 1,116 3,719 3,242 3,335 3,747 4,039 3,977 1,275 4,539 1,770 2,065 2,198 2,060 2,069 7,172 8,213
) 2 7.88 7.88 7.88 89.5 89.5 89.5 24 24 24 38.1 38.1 38.1 47.2 47.2 47.2 122 122 122 332 332 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 stown, Va. stown, Va. stown, Va. Leesburg, Va. Leesburg, Va. Leesburg, Va. burg, Va. burg, Va. burg, Va. n e a r L i n c o l n , Va . n e a r L i n c o l n , Va . n e a r L i n c o l n , Va . n e a r L i n c o l n , Va . n e a r L i n c o l n , Va . n e a r L i n c o l n , Va . M o u n t v i l l e , Va . M o u n t v i l l e , Va . M o u n t v i l l e , Va . Leesburg, Va. Leesburg, Va. Catoctin Creek at Route 663 at Taylor Catoctin Creek at Route 663 Taylor Catoctin Creek at Route 663 Taylor Catoctin Creek at Route 663 Limestone Branch at Route 15 near Limestone Branch at Route 15 near Limestone Branch at Route 15 near near Middle Goose Creek at Route 611 near Middle Goose Creek at Route 611 near Middle Goose Creek at Route 611 North Fork Goose Creek at Route 722 North Fork Goose Creek at Route 722 North Fork Goose Creek at Route 722 North Fork Goose Creek at Route 729 North Fork Goose Creek at Route 729 North Fork Goose Creek at Route 729 Beaverdam Creek at Route 734 near Beaverdam Creek at Route 734 near Beaverdam Creek at Route 734 near Goose Creek above Route 621 near Goose Creek above Route 621 near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01638480 01638480 01638480 01643590 01643590 01643590 01643700 01643700 01643700 01643800 01643800 01643800 01643805 01643805 01643805 01643880 01643880 01643880 01644000 01644000 Table 2. Table [mi 32 Peak-Flow Characteristics of Virginia Streams ------500 0.002 751 3,471 2,508 1,267 1,438 31,070 12,830 -- -- 200 0.005 625 580 697 598 918 2,659 2,965 2,765 2,658 5,102 9,842 1,173 1,076 1,052 11,500 11,913 68,282 17,610 24,055 -- -- 100 0.01 643 438 473 490 476 709 834 594 2,147 2,345 2,224 1,947 3,812 6,402 11,270 53,358 10,530 18,850 10,893 -- -- 50 0.02 342 279 382 314 364 538 563 325 1,711 1,672 1,694 1,326 7,084 2,675 4,031 9,597 9,873 41,156 14,206 /s) 3 -- -- 25 0.04 890 175 175 305 198 268 398 466 175 1,339 1,231 1,285 4,347 1,854 2,521 8,685 8,845 31,296 10,605 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 66.0 85.4 72.7 97.3 932 780 843 483 220 162 255 290 2,161 1,055 1,292 7,493 6,761 7,396 20,989 -- -- 5 0.2 28.4 44.6 34.6 51.2 99.5 675 501 560 279 638 739 166 170 188 1,192 6,575 4,547 6,207 14,739 -- -- 9.00 18.6 12.6 21.5 52.5 96.0 2.33 113 0.4292 428 265 309 132 542 321 359 102 9,040 5,474 2,631 4,826 -- -- 6.80 9.63 2 0.5 14.6 16.9 45.2 82.8 81.6 381 224 264 108 447 267 299 103 7,960 5,225 2,293 4,549
) 2 1.11 1.11 1.11 2.06 2.06 2.06 3.88 3.88 3.88 0.33 0.33 76.1 76.1 76.1 0.069 0.069 0.069 0.085 0.085 0.085 332 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Leesburg, Va. n e a r L e e s b u rg , Va . n e a r L e e s b u rg , Va . n e a r L e e s b u rg , Va . Lenah, Va. Lenah, Va. Lenah, Va. Arcola, Va. Arcola, Va. Arcola, Va. Reston, Va. Reston, Va. Reston, Va. Reston, Va. Reston, Va. Reston, Va. Reston, Va. Reston, Va. Goose Creek above Route 621 near South Fork Sycolin Creek at Route 15 South Fork Sycolin Creek at Route 15 South Fork Sycolin Creek at Route 15 Lenah Run (Broad Run) at Route 50 Lenah Run (Broad Run) at Route 50 Lenah Run (Broad Run) at Route 50 South Fork Broad Run at Route 50 near South Fork Broad Run at Route 50 near South Fork Broad Run at Route 50 near B r o a d B R r u o n a d a t B R r u R o n o a u d a t Stave Run at Parking Lot Road t e R u R 7 n o u n a t e t e a r R 7 o L u n e Stave Run at Parking Lot Road t e e e a s r b 7 u L r n e g e e , a s r b V a u . L r Stave Run at Parking Lot Road e g e , s b V a u . r g , V a Stave Run below Parking Lot Road near . Stave Run below Parking Lot Road near Stave Run below Parking Lot Road near Airport Road at Smilax Branch at Dulles Airport Road at Smilax Branch at Dulles (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01644000 01644100 01644100 01644100 01644200 01644200 01644200 01644250 01644250 01644250 01644280 01644280 01644280 01644290 01644290 01644290 01644291 01644291 01644291 01644295 01644295 Table 2. Table [mi Table 2 33 ------500 0.002 883 396 414 1,378 2,178 5,560 3,267 1,686 2,272 1,810 1,294 2,485 1,315 2,786 1,355 -- -- 200 0.005 672 369 977 386 969 1,173 4,756 9,732 1,848 3,715 2,291 2,282 1,066 1,449 1,636 1,499 1,961 1,494 -- -- 100 0.01 541 894 349 756 364 754 1,031 3,546 7,417 1,616 2,954 1,990 1,796 1,280 1,279 1,280 1,624 1,328 -- -- 50 0.02 900 431 714 895 329 506 338 548 1,119 2,480 5,362 1,397 2,219 1,669 1,294 1,034 1,329 1,154 /s) 3 -- -- 25 0.04 778 338 568 965 730 874 309 420 315 426 982 1,713 3,833 1,191 1,757 1,383 1,043 1,073 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 628 970 933 238 668 412 768 462 620 281 260 279 783 271 739 2,287 1,149 1,026 -- -- 5 0.2 519 583 745 780 761 175 446 289 622 305 459 259 169 249 593 179 546 1,445 ------91.1 2.33 115 0.4292 399 292 771 534 452 498 252 171 455 169 309 230 215 402 345 ------2 0.5 72.4 373 243 654 489 377 440 104 206 145 419 137 274 224 206 365 306
) 2 0.33 3.39 3.39 3.39 4.36 4.36 4.36 1.58 1.58 1.58 0.79 0.79 0.79 0.27 0.27 0.27 5.04 13.4 13.4 13.4 (mi area Drainage - - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Reston, Va. Va. Va. Va. ville, Va. ville, Va. ville, Va. Va. Va. Va. M i l l R o a d n e a r FM a i i l r l f a R x o , a d Va . n e a r FM a i i l r l f a R x o , a d Va . n e a r FReston, a i r f aVa. x , Va . Reston, Va. Reston, Va. Va. Va. Va. t o n ( n e a r H e r n d o n ) , Va . Smilax Branch at Dulles Airport Road at Smilax Branch at Dulles Sugarland Run at Route 606 Herndon, Sugarland Run at Route 606 Herndon, Sugarland Run at Route 606 Herndon, Sugarland Run at Route 7 near Dranes Sugarland Run at Route 7 near Dranes Sugarland Run at Route 7 near Dranes Difficult Run at Route 665 near Fairfax, Difficult Run at Route 665 near Fairfax, Difficult Run at Route 665 near Fairfax, South Fork Little Difficult Run at Fox South Fork Little Difficult Run at Fox South Fork Little Difficult Run at Fox Snakeden Branch at Soapstone Drive Snakeden Branch at Soapstone Drive Snakeden Branch at Soapstone Drive Vienna, Piney Branch above railroad at Vienna, Piney Branch above railroad at Vienna, Piney Branch above railroad at Colvin Run at Hunter Mill Road Res (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01644295 01644300 01644300 01644300 01644370 01644370 01644370 01645700 01645700 01645700 01645750 01645750 01645750 01645784 01645784 01645784 01645800 01645800 01645800 01645900 Table 2. Table [mi 34 Peak-Flow Characteristics of Virginia Streams ------500 0.002 5,999 3,744 1,718 4,720 5,764 9,900 3,588 2,759 4,474 3,106 3,270 2,644 33,910 21,540 15,910 27,940 ------200 0.005 3,983 2,533 2,586 1,641 3,198 3,839 6,479 2,487 2,325 3,044 2,513 2,263 11,490 22,440 12,845 17,153 ------100 0.01 3,171 2,124 2,041 1,583 2,534 8,859 3,055 4,854 1,961 2,024 2,410 2,142 2,026 16,270 10,480 12,918 ------50 0.02 2,397 1,725 1,486 1,525 1,879 8,768 9,930 6,723 2,302 3,512 1,423 1,744 1,780 1,757 1,716 11,680 /s) 3 ------25 0.04 1,893 1,379 1,192 1,466 1,496 8,264 6,632 7,296 4,999 1,820 2,710 1,143 1,483 1,419 1,460 1,483 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 993 768 973 736 921 1,242 1,386 5,075 4,570 4,748 3,226 1,192 1,652 1,162 1,051 1,107 ------5 0.2 811 845 712 515 657 492 931 621 781 846 1,119 1,321 3,380 3,242 3,291 2,189 ------2.33 0.4292 492 443 293 378 471 670 279 675 356 522 603 1,239 2,002 2,005 2,004 1,271 ------2 0.5 411 385 241 313 393 576 230 621 295 465 546 1,220 1,770 1,745 1,755 1,107
) 2 5.04 5.04 2.05 2.05 2.05 3.19 3.19 3.19 4.67 4.67 4.67 1.89 1.89 1.89 2.88 2.88 2.88 57.8 57.8 57.8 (mi area Drainage - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 t o n ( n e a r H e r n d o n )t , o n Va ( . n e a r H e r n d o n )Va. , Va . Va. Va. Falls, Va. Falls, Va. Falls, Va. Great Falls, Va. Great Falls, Va. Great Falls, Va. McLean, Va. McLean, Va. McLean, Va. McLean, Va. McLean, Va. McLean, Va. F a l l s C h u r c h , Va . F a l l s C h u r c h , Va . F a l l s C h u r c h , Va . Colvin Run at Hunter Mill Road Res Colvin Run at Hunter Mill Road Res Pike at Reston, Piney Run at Leesburg Pike at Reston, Piney Run at Leesburg Pike at Reston, Piney Run at Leesburg Road near Great Towlston Rocky Run at Road near Great Towlston Rocky Run at Road near Great Towlston Rocky Run at Difficult Run below Route 193 near Difficult Run below Route 193 near Difficult Run below Route 193 near Pike near Scott Run at Old Georgetown Pike near Scott Run at Old Georgetown Pike near Scott Run at Old Georgetown Dead Run at Benjamin Street near Dead Run at Benjamin Street near Dead Run at Benjamin Street near Pimmit Run at Great Falls Road near Pimmit Run at Great Falls Road near Pimmit Run at Great Falls Road near (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01645900 01645900 01645950 01645950 01645950 01645975 01645975 01645975 01646000 01646000 01646000 01646200 01646200 01646200 01646300 01646300 01646300 01646600 01646600 01646600 Table 2. Table [mi Table 2 35 500 0.002 9,665 7,771 8,976 2,490 1,652 7,921 3,986 2,178 2,488 2,217 4,378 1,030 3,373 8,832 1,237 4,851 4,295 2,143 6,358 26,770 200 0.005 479 580 7,534 5,048 6,443 1,912 1,222 1,585 6,019 2,739 4,497 1,881 1,779 1,864 3,426 2,292 6,503 2,869 2,131 21,010 100 0.01 949 364 443 6,173 4,039 5,139 1,549 1,236 4,845 2,164 3,479 1,675 1,393 1,619 2,822 1,788 5,095 2,094 1,665 17,240 50 0.02 648 894 982 274 335 3,117 4,998 3,996 1,239 3,861 1,583 2,580 1,481 1,358 2,304 1,379 3,936 1,512 1,290 13,920 /s) 3 25 0.04 974 534 720 798 198 242 966 3,983 2,440 3,158 3,035 1,267 2,045 1,300 1,173 1,858 1,043 2,985 1,069 11,000 Peak flow (ft Return period (years) Exceedance probability 10 0.1 683 334 453 819 507 881 122 708 151 662 625 2,849 1,617 2,091 2,143 1,294 1,074 1,362 1,988 7,684 5 0.2 79.0 98.0 499 218 309 550 907 909 335 697 515 447 423 2,117 1,110 1,485 1,587 1,041 1,390 5,520 ------2.33 119 0.4292 654 945 321 187 314 581 723 187 522 724 844 1,397 1,058 3,389 ------2 0.5 95.4 551 832 287 160 957 259 512 683 152 484 663 745 1,257 2,978
) 1.3 1.3 1.3 2 8.26 8.26 8.26 0.43 0.43 0.43 2.31 2.31 2.31 0.94 0.94 0.94 0.93 0.93 0.93 12.6 12.6 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 ton, Va. ton, Va. ton, Va. F a l l s R o a d a t A rF l a i l n l g s t o R n o , a d Va . a t A rF l a i l n l g s t o R n o , a d Va . a t A rArlington, l i n g t o n , Va. Va . Arlington, Va. Arlington, Va. R o a d a t A r l i n g t o n ,R o Va a . d a t A r l i n g t o n ,R o Va a . d a t A r l i n g t o n ,Va. Va . Va. Va. ton, Va. ton, Va. ton, Va. Alexandria, Va. Alexandria, Va. Pimmit Run below Kirby Road at Arling Pimmit Run below Kirby Road at Arling Pimmit Run below Kirby Road at Arling Pimmit Run below Kirby Road at Little Pimmit Run tributary above Little Pimmit Run tributary above Little Pimmit Run tributary above Little Pimmit Run at Route 689 Little Pimmit Run at Route 689 Little Pimmit Run at Route 689 Long Branch at South Carlyn Springs Long Branch at South Carlyn Springs Long Branch at South Carlyn Springs Arlington, Doctors Run at 8th Street Arlington, Doctors Run at 8th Street Arlington, Doctors Run at 8th Street Arling Lucky Run at Dinwiddie Street Arling Lucky Run at Dinwiddie Street Arling Lucky Run at Dinwiddie Street Fourmile Run at Shirlington Road Fourmile Run at Shirlington Road (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01646700 01646700 01646700 01646750 01646750 01646750 01646800 01646800 01646800 01652400 01652400 01652400 01652430 01652430 01652430 01652470 01652470 01652470 01652500 01652500 Table 2. Table [mi 36 Peak-Flow Characteristics of Virginia Streams ------500 0.002 369 372 9,106 4,351 7,233 7,184 4,283 3,608 4,044 1,806 5,738 9,376 6,226 7,216 14,140 10,549 15,167 ------200 0.005 360 363 9,549 6,529 2,967 4,166 5,319 4,698 5,060 3,465 2,500 3,055 1,326 3,824 6,191 6,679 10,240 ------100 0.01 352 355 7,911 7,258 4,994 2,348 3,149 4,175 3,753 3,983 2,918 1,971 2,468 1,032 3,042 4,662 5,376 ------50 0.02 344 709 347 5,447 3,753 1,730 2,268 3,242 2,878 3,060 2,426 1,431 1,894 6,023 2,291 3,391 4,250 /s) 3 ------25 0.04 336 583 338 4,005 2,755 1,381 1,758 2,483 2,259 2,372 1,984 1,149 1,536 4,498 1,812 2,620 3,292 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 895 740 324 365 325 2,592 1,736 1,083 1,690 1,492 1,577 1,464 1,012 2,928 1,187 1,610 2,208 ------5 0.2 603 724 495 715 314 239 313 807 1,110 1,809 1,148 1,216 1,022 1,103 2,006 1,095 1,530 ------2.33 0.4292 636 345 418 782 599 680 743 281 453 301 131 298 468 658 915 1,185 ------2 0.5 547 286 353 702 504 592 670 231 395 297 106 294 391 567 778 1,038
) 2 7.11 7.11 7.11 2.73 2.73 2.73 1.91 1.91 1.91 0.51 0.51 0.51 4.63 4.63 4.63 12.6 14.8 14.8 14.8 18.8 (mi area Drainage - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Alexandria, Va. Va. Va. Va. Annandale, Va. Annandale, Va. Annandale, Va. S t r e e t a t F a l l s S C t h r u e r e c t h , a t Va . F a l l s S C t h r u e r e c t h , a t Va . F a l l s R C o h a u d r c n h , e a Va r . F a l l sR o C a h d u r n c e h a , r Va F . a l l sR o C a h d u r n c e h a , r Va F . a l l sF a C l l h s u C r h c u h r c , h , Va Va . . F a l l s C h u r c h , Va . F a l l s C h u r c h , Va . Alexandria, Va. Alexandria, Va. Alexandria, Va. andria, Va. Fourmile Run at Shirlington Road Holmes Run at Route 50 Merrifield, Holmes Run at Route 50 Merrifield, Holmes Run at Route 50 Merrifield, Holmes Run at Sleepy Hollow Road near Holmes Run at Sleepy Hollow Road near Holmes Run at Sleepy Hollow Road near Washington Run above South Tripps Washington Run above South Tripps Washington Run above South Tripps Run tributary at Holmes Tripps Run tributary at Holmes Tripps Run tributary at Holmes Tripps Run at Sleepy Hollow Road near Tripps Run at Sleepy Hollow Road near Tripps Run at Sleepy Hollow Road near Tripps Holmes Run below Lake Barcroft, near Holmes Run below Lake Barcroft, near Holmes Run below Lake Barcroft, near Alex Holmes Run above Route 236 at (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01652500 01652600 01652600 01652600 01652610 01652610 01652610 01652620 01652620 01652620 01652645 01652645 01652645 01652650 01652650 01652650 01652670 01652670 01652670 01652690 Table 2. Table [mi Table 2 37 -- 500 0.002 799 942 818 3,009 3,773 3,220 2,172 1,683 2,587 1,805 2,083 2,459 11,958 16,070 10,053 13,348 26,600 16,286 22,372 -- 200 0.005 800 861 681 436 634 7,492 2,479 2,604 2,522 1,722 1,493 6,391 9,366 9,943 2,149 1,856 12,800 21,620 15,785 -- 100 0.01 615 662 600 331 541 2,118 6,044 2,055 2,093 1,434 1,207 5,139 7,436 8,069 1,853 1,546 10,640 18,270 12,681 -- 50 0.02 467 963 504 524 249 455 4,826 1,788 1,497 1,657 1,183 8,712 4,047 5,784 6,602 1,584 1,273 15,230 10,124 /s) 3 -- 25 0.04 966 341 755 369 453 179 375 8,011 3,723 1,486 1,201 1,356 6,999 3,140 4,561 5,041 1,339 1,028 12,470 Peak flow (ft Return period (years) Exceedance probability -- 10 0.1 110 774 933 720 214 532 232 754 365 282 9,211 2,508 1,124 5,021 2,102 2,964 3,437 5,298 1,045 -- 5 0.2 71.1 871 519 671 559 141 396 840 153 579 301 220 1,746 3,703 1,455 2,098 6,976 2,416 3,836 ------2.33 0.4292 601 295 430 397 867 619 229 1,050 2,371 1,330 4,642 1,474 2,528 ------2 0.5 897 545 243 378 365 737 573 214 2,108 1,170 4,170 1,272 2,263
) 2 2.08 2.08 2.08 2.28 2.28 2.28 2.59 2.59 2.59 0.79 0.79 0.79 18.8 18.8 13.5 13.5 13.5 33.9 33.9 33.9 (mi area Drainage - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 andria, Va. andria, Va. Springfield, Va. Springfield, Va. Springfield, Va. Alexandria, Va. Alexandria, Va. Alexandria, Va. S t r e e t a t A l e x a n dS r t i r a e , e t Va . a t A l e x a n dS r t i r a e , e t Va . a t A l e x a n dAlexandria, r i a , Va . Va. Alexandria, Va. Alexandria, Va. Va. Va. Va. a t A l e x a n d r i a , Va . a t A l e x a n d r i a , Va . a t A l e x a n d r i a , Va . Holmes Run above Route 236 at Alex Holmes Run above Route 236 at Alex Holmes Run above Route 236 at Backlick Run at Leesville Boulevard Backlick Run at Leesville Boulevard Backlick Run at Leesville Boulevard Run at Shirley Route Turkeycock Run at Shirley Route Turkeycock Run at Shirley Route Turkeycock Dorn Van Backlick Run below South Dorn Van Backlick Run below South Dorn Van Backlick Run below South Cameron Run below railroad bridge at Cameron Run below railroad bridge at Cameron Run below railroad bridge at Alexandria, at Pike Branch at Route 611 Alexandria, at Pike Branch at Route 611 Alexandria, at Pike Branch at Route 611 Avenue Penn Daw outfall at Huntington Avenue Penn Daw outfall at Huntington Avenue Penn Daw outfall at Huntington (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01652690 01652690 01652710 01652710 01652710 01652810 01652810 01652810 01652910 01652910 01652910 01653000 01653000 01653000 01653210 01653210 01653210 01653447 01653447 01653447 Table 2. Table [mi 38 Peak-Flow Characteristics of Virginia Streams ------500 0.002 5,116 7,051 3,763 5,610 2,840 4,592 8,072 26,910 13,874 21,470 13,561 17,726 14,730 ------200 0.005 4,618 8,530 2,598 4,570 2,008 3,449 8,407 9,267 3,442 5,005 18,050 16,710 12,085 ------100 0.01 1,554 3,947 3,688 6,201 2,050 3,872 1,576 2,747 6,799 9,530 6,430 2,733 3,651 13,170 13,630 ------50 0.02 736 1,951 9,468 2,824 4,409 1,493 3,244 1,123 2,073 5,483 7,453 4,388 2,039 2,570 10,950 /s) 3 ------25 0.04 565 909 1,522 6,682 2,218 3,329 1,198 2,677 1,697 8,618 4,212 5,787 2,929 1,619 1,936 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 428 772 580 1,177 4,041 1,464 1,993 2,007 1,087 6,003 2,851 3,766 1,634 1,056 1,175 ------5 0.2 312 880 518 385 775 989 715 774 2,623 1,002 1,339 1,547 4,318 1,993 2,655 ------2.33 0.4292 196 567 587 795 294 216 509 503 413 435 1,466 1,066 2,673 1,205 1,662 ------2 0.5 128 383 493 683 242 967 176 451 426 343 364 1,271 2,358 1,034 1,459
) 2 1.97 1.97 1.97 6.86 6.86 6.86 2.07 2.07 2.07 1.21 1.21 1.21 3.72 3.72 3.72 10.8 10.8 10.8 23.9 23.9 23.9 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Springs, Va. Springs, Va. Springs, Va. Va. Va. Va. Fairfax, Va. Fairfax, Va. Fairfax, Va. Vienna, Va. Vienna, Va. Vienna, Va. Annandale, Va. Annandale, Va. Annandale, Va. n e a r A n n a n d a l e , Va . n e a r A n n a n d a l e , Va . n e a r A n n a n d a l e , Va . Little Hunting Creek at Route 1 Gum Little Hunting Creek at Route 1 Gum Little Hunting Creek at Route 1 Gum Accotink, Dogue Creek at Route 1 near Accotink, Dogue Creek at Route 1 near Accotink, Dogue Creek at Route 1 near Accotink Creek at Pickett Street Accotink Creek at Pickett Street Accotink Creek at Pickett Street Arlington Boulevard near Bear Branch at Arlington Boulevard near Bear Branch at Arlington Boulevard near Bear Branch at L o n g B L r o a n n g c h B L r a o a t n n g c L h eAccotink Creek above Route 620 near B e r a a t R n o c L u h e t e e a t R a o t L u Accotink Creek above Route 620 near e t V i e e e n R a n o t a u , t V i e e V a n a . n t Accotink Creek above Route 620 near a , V i e V a n . n a , V a . Long Branch (Little Run) at Route 620 Long Branch (Little Run) at Route 620 Long Branch (Little Run) at Route 620 (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01653700 01653700 01653700 01653800 01653800 01653800 01653900 01653900 01653900 01653925 01653925 01653925 01653950 01653950 01653950 01654000 01654000 01654000 01654500 01654500 01654500 Table 2. Table [mi Table 2 39 ------500 0.002 7,554 5,188 7,844 4,400 1,438 8,217 8,899 5,674 5,058 9,096 11,840 17,075 10,698 ------200 0.005 6,073 7,583 3,487 4,930 2,998 1,076 6,024 6,765 6,274 4,254 3,407 7,016 10,382 ------100 0.01 834 5,112 8,433 5,952 2,371 5,348 2,768 3,612 2,373 4,728 5,446 4,997 3,373 2,704 ------50 0.02 563 4,269 6,927 5,034 1,145 3,721 2,068 2,562 1,750 3,680 4,310 3,940 2,634 2,016 /s) 3 ------25 0.04 885 466 3,527 5,280 4,047 2,543 1,641 1,925 1,396 2,832 3,338 3,040 2,015 1,601 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 677 906 290 2,677 3,606 3,024 1,477 1,071 1,179 1,956 2,239 2,094 1,352 1,044 ------5 0.2 499 933 726 782 610 188 945 707 2,111 2,539 2,278 1,434 1,553 1,493 ------2.33 0.4292 317 509 419 447 350 102 958 929 944 567 408 1,532 1,553 1,540 ------2 0.5 81.6 211 440 348 377 289 871 790 833 497 339 1,416 1,342 1,388
) 2 4.26 4.26 4.26 3.82 3.82 3.82 2.79 2.79 2.79 0.33 0.33 0.33 3.64 3.64 37.1 37.1 37.1 15.2 15.2 15.2 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 n e a r A c c o t i n k S t an t e i a o r n A , c Va c o . t i n k S t an t e i a o r n A , c Va c o . t i n k S t aAccotink, t i o n , VaVa. . Accotink, Va. Accotink, Va. Burke, Va. Burke, Va. Burke, Va. F a i r f a x S t a t i o n , Va . F a i r f a x S t a t i o n , Va . F a i r f a x S t a t i o n , Va . R o a d n e a r B u r k e , VaR . o a d n e a r B u r k e , VaR . o a d n e a r B u r k e , VaS . p r i n g fi e l d , Va . S p r i n g fi e l d , Va . S p r i n g fi e l d , Va . Va. Va. Accotink Creek at Army Engineer Road Accotink Creek at Army Engineer Road Accotink Creek at Army Engineer Road Accotink Creek at Long Branch at Newington Road, near Long Branch at Newington Road, near Long Branch at Newington Road, near Rabbit Branch at Guinea Road near Rabbit Branch at Guinea Road near Rabbit Branch at Guinea Road near Sideburn Branch at Poburn Road near Sideburn Branch at Poburn Road near Sideburn Branch at Poburn Road near Pohick Creek tributary at Keene Mill Pohick Creek tributary at Keene Mill Pohick Creek tributary at Keene Mill Pohick Creek at Hooes Road near Pohick Creek at Hooes Road near Pohick Creek at Hooes Road near Middle Run at Route 640 near Lorton, Middle Run at Route 640 near Lorton, (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01655000 01655000 01655000 01655160 01655160 01655160 01655310 01655310 01655310 01655330 01655330 01655330 01655340 01655340 01655340 01655350 01655350 01655350 01655370 01655370 Table 2. Table [mi 40 Peak-Flow Characteristics of Virginia Streams ------500 0.002 375 5,393 6,087 6,743 6,364 17,770 15,619 16,948 16,770 34,040 24,230 ------200 0.005 322 3,809 4,401 4,433 4,417 9,569 8,773 5,713 3,360 11,343 12,830 12,150 10,146 25,620 26,764 25,880 21,450 34,847 22,171 37,121 ------100 0.01 283 2,993 3,399 3,537 3,472 9,940 7,759 8,864 9,338 7,023 7,885 4,283 2,661 20,430 21,041 20,594 19,440 27,619 20,012 29,479 ------50 0.02 247 2,254 2,589 2,699 2,651 7,618 6,328 6,938 7,028 5,227 5,821 3,021 1,907 16,080 15,935 16,034 17,500 21,173 17,843 22,664 /s) 3 ------25 0.04 211 1,763 1,935 2,123 2,041 5,757 4,838 5,274 5,145 3,942 4,291 2,105 1,408 11,957 12,450 12,262 15,620 16,089 15,679 17,275 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 166 895 1,143 1,263 1,399 1,349 3,853 3,293 3,520 3,201 2,582 2,729 8,558 7,682 8,140 1,208 11,367 13,170 10,538 12,670 ------5 0.2 781 869 956 924 736 133 578 2,738 2,312 2,483 2,070 1,723 1,792 6,155 5,205 5,636 7,271 7,878 11,300 10,291 ------94.7 2.33 0.4292 462 517 559 543 968 989 374 308 1,738 1,408 1,549 1,091 3,897 3,041 3,396 9,078 4,351 7,652 4,741 ------2 0.5 86.5 394 454 469 463 922 830 845 313 260 1,556 1,213 1,364 3,473 2,658 3,000 8,578 3,832 7,141 4,183
) 6.3 6.3 6.3 2 3.64 4.82 4.82 4.82 2.55 2.55 31.3 31.3 31.3 13.1 13.1 13.1 93.4 93.4 93.4 155 155 155 175 175 175 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. Va. Va. Va. Va. Va. Va. Va. Va. Va. Va. Va. Va. Va. Middle Run at Route 640 near Lorton, South Run at Hooes Road near Lorton, South Run at Hooes Road near Lorton, South Run at Hooes Road near Lorton, Pohick Creek at Lorton Road Lorton, Pohick Creek at Lorton Road Lorton, Pohick Creek at Lorton Road Lorton, Warrenton, Cedar Run at Route 672 near Warrenton, Cedar Run at Route 672 near Warrenton, Cedar Run at Route 672 near C e d a r C R e u d n a r a t C R e u R d n o a u r a t t e C R e u R 8 d n o 0 a u 6 r a t t e n R C e u e R 8 a n d o 0 r a u 6 a r t C t e n a R C e t R u e 8 a l o n d 0 r e u a 6 t t a r CAden, t e t Goslin Run at Marine Road near n a , R e t 6 R u a l V 1 o n a r e 1 u . t t a C n t e t a e , t a 6 R l r V 1 o a e 1 u . A t tAden, Goslin Run at Marine Road near d n t e e e , n a 6 , r V 1 a 1 . Va A d n . e e n a , r Aden, Goslin Run at Marine Road near Va A d . e n , Va . C e d a r C R e u d n a r a t C R e u R d n o a u r a t Warrenton, Broad Run at Route 17 near t e R u R 6 n o 4 u 6 a t t e n e R 6 a o 4 r u 6 A t Warrenton, Broad Run at Route 17 near d e n e e n 6 a , 4 r 6 V A a d n . e e n a , r V A a d . e n , V a . (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01655370 01655380 01655380 01655380 01655390 01655390 01655390 01655500 01655500 01655500 01656000 01656000 01656000 01656100 01656100 01656100 01656102 01656102 01656102 01656120 01656120 01656120 01656200 01656200 Table 2. Table [mi Table 2 41 ------500 0.002 567 3,661 35,330 78,430 ------200 0.005 534 965 2,354 2,285 2,327 7,317 3,121 23,810 19,288 21,574 27,092 52,709 47,420 13,664 30,380 ------100 0.01 509 532 886 1,660 1,666 1,662 5,528 2,297 42,311 17,440 15,578 16,466 21,964 32,040 10,523 20,364 ------50 0.02 484 508 767 1,152 1,126 1,139 7,726 3,944 1,575 11,957 12,600 12,240 17,085 33,060 21,380 13,335 /s) 3 ------25 0.04 783 751 765 459 483 663 8,930 9,178 9,079 5,613 8,657 2,781 1,066 13,213 25,626 14,030 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 447 403 419 423 447 586 514 5,437 6,157 5,910 8,957 7,743 3,434 4,694 1,625 17,299 ------5 0.2 276 230 244 394 414 342 384 3,551 4,227 4,028 6,225 4,719 2,221 2,843 1,007 12,283 ------2.33 117 0.4292 144 108 356 523 364 165 235 2,002 2,480 2,361 3,721 7,629 2,493 1,221 1,515 ------2 0.5 87.8 96.6 122 347 441 352 135 204 1,740 2,152 2,052 3,245 6,800 2,145 1,047 1,306
) 2 2.55 0.83 0.83 0.83 7.75 7.75 7.75 1.51 1.51 1.51 50.2 50.2 50.2 89.6 89.6 89.6 25.7 25.7 25.7 343 343 343 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Buckland, Va. Buckland, Va. Buckland, Va. Va. Va. Va. 2 3 4 n e a r M a n a s s a s2 , 3 4 Va . n e a r M a n a s s a s2 , 3 4 Va . n e a r M a n a s s a sVa. , Va . Va. Va. Va. Va. Va. Broad Run at Route 17 near Warrenton, Warrenton, Broad Run at Route 17 near B r o a d B R r u o n a d a t B R r u R o n o a u d a t Broad Run tributary 1 at Route 29 t e R u R 2 n o 9 u a t a t e t R 2 B o 9 u u c t Broad Run tributary 1 at Route 29 a k e t l a 2 B n 9 u d c , a k t V l a a . B n u d c , Broad Run tributary 1 at Route 29 k V l a a . n d , V a . Broad Run at Route 619 near Bristow, Broad Run at Route 619 near Bristow, Broad Run at Route 619 near Bristow, Occoquan River (Creek) below Route Occoquan River (Creek) below Route Occoquan River (Creek) below Route Bull Run at Route 705 near Catharpin, Bull Run at Route 705 near Catharpin, Bull Run at Route 705 near Catharpin, C u b R u C n u b a t R u R C n o u u b a t t e R Cain Branch at Route 50 near Chantilly, u R 5 n o 0 u a t n t e e a R 5 r o 0 u C t n h e e a Cain Branch at Route 50 near Chantilly, a n 5 r t 0 i C l n h l e a y , a n r t V i a C l . h l Cain Branch at Route 50 near Chantilly, a y , n t V i a l . l y , V a . (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01656200 01656500 01656500 01656500 01656600 01656600 01656600 01656650 01656650 01656650 01656700 01656700 01656700 01656725 01656725 01656725 01656800 01656800 01656800 01656850 01656850 01656850 Table 2. Table [mi 42 Peak-Flow Characteristics of Virginia Streams ------500 0.002 5,022 30,480 92,450 45,820 178,900 ------200 0.005 3,384 17,116 23,850 19,266 22,306 65,290 33,778 55,335 33,898 38,212 90,155 38,870 68,677 41,845 120,800 ------100 0.01 2,685 13,273 19,510 14,995 17,746 49,670 26,746 41,451 26,844 89,010 30,372 64,765 34,030 55,578 36,718 ------50 0.02 9,847 2,001 11,186 15,670 13,625 37,370 20,474 30,415 20,553 64,910 23,382 45,590 29,500 43,959 31,793 /s) 3 ------25 0.04 7,232 8,262 1,590 12,300 10,172 27,690 15,535 21,958 15,597 46,710 17,847 31,624 25,260 34,510 27,134 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 4,497 8,480 5,182 6,412 1,036 11,768 18,020 10,152 13,599 10,195 29,360 18,676 20,000 23,750 21,057 ------5 0.2 701 2,954 5,999 3,432 4,227 6,990 9,067 7,021 8,172 12,500 19,930 12,135 16,190 17,174 16,532 ------2.33 0.4292 404 1,658 3,579 1,947 2,403 7,680 4,171 5,386 4,191 4,930 7,150 11,930 11,536 12,080 10,925 ------2 0.5 336 3,118 1,431 1,686 2,093 6,825 3,670 4,779 3,688 4,354 6,370 9,812 11,020 10,740 10,551
) 2 3.59 3.59 3.59 39.6 39.6 39.6 49.7 49.7 49.7 146 146 146 147 147 147 185 185 185 570 570 570 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. Va. Va. Va. Va. Park, Va. Park, Va. Park, Va. Fairfax, Va. Fairfax, Va. Fairfax, Va. Va. Va. Va. ( s i t e n o w i n( s O i c t c e o q n u o a w n i R n( e s s O i e c t r c e v o o q n i u o r a w ) n , i R n V e a s O . e c r c v o o q i u r a ) n , R V e a s . e r v o i r ) , V a . Cub Run at Route 29 near Centreville, Cub Run at Route 29 near Centreville, Cub Run at Route 29 near Centreville, C u b R u C n u b a t R u R C n o u u b a t t e R Bull Run at Route 616 near Manassas, u R 6 n o 5 u 8 a t t e n e R 6 a o 5 r u 8 t B e n u Bull Run at Route 616 near Manassas, e l 6 a l 5 r 8 R B u n u n e l , a l r V a R . B u Bull Run at Route 616 near Manassas, u n l , l V a R . u n , V a Bull Run at Route 28 near Manassas . Bull Run at Route 28 near Manassas Bull Run at Route 28 near Manassas Popes Head Creek at Route 654 near Popes Head Creek at Route 654 near Popes Head Creek at Route 654 near Ford near Clifton, Yates Bull Run above Ford near Clifton, Yates Bull Run above Ford near Clifton, Yates Bull Run above Occoquan River (Creek) near Occoquan River (Creek) near Occoquan River (Creek) near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01656940 01656940 01656940 01656960 01656960 01656960 01657000 01657000 01657000 01657020 01657020 01657020 01657300 01657300 01657300 01657415 01657415 01657415 01657500 01657500 01657500 Table 2. Table [mi Table 2 43 ------500 0.002 4,022 4,780 5,259 4,948 2,572 2,449 7,067 6,753 7,450 8,395 6,820 2,555 6,934 11,238 14,830 ------200 0.005 4,119 8,583 2,761 3,672 3,530 3,612 2,089 1,184 1,912 4,627 4,969 4,857 5,418 7,078 4,933 ------100 0.01 916 5,595 2,182 2,934 2,974 2,804 2,895 1,772 1,583 3,696 3,886 3,883 4,342 5,703 3,885 ------50 0.02 702 3,589 1,598 2,003 2,379 2,097 2,234 1,492 1,296 2,830 2,992 2,986 3,370 4,531 2,990 /s) 3 ------25 0.04 518 2,255 1,279 1,498 1,873 1,663 1,765 1,243 1,043 2,223 2,257 2,341 2,631 3,503 2,290 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 826 892 955 329 762 1,163 1,316 1,086 1,179 1,468 1,487 1,549 1,749 2,355 1,515 ------5 0.2 666 555 578 964 736 826 760 219 583 1,004 1,025 1,062 1,204 1,636 1,042 ------2.33 711 0.4292 320 317 318 623 425 507 559 589 607 624 980 614 ------2 0.5 269 261 263 558 354 439 518 494 531 525 601 836 528
) 2 2.35 2.35 2.35 3.92 3.92 3.92 4.52 4.52 4.52 6.89 6.89 6.89 7.62 7.62 7.62 9.57 9.57 9.57 16.7 16.7 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 F a i r f a x S t a t i o n , Va . F a i r f a x S t a t i o n , Va . F a i r f a x S t a t i o n , Va . coquan, Va. coquan, Va. coquan, Va. Va. Va. Va. Dumfries, Va. Dumfries, Va. Dumfries, Va. n e a r I n d e p e n d e n t n H e i a l r l , I n Va d e . p e n d e n t n H e i a l r l , I n Va d e . p e n d e n t L a H k i e l , l , n e Va a r . J o p l i n ,L Va a k . e , n e a r J o p l i n ,L Va a k . e , n e a r J o p l i n ,n e Va a . r D u m f r i e s , Va . n e a r D u m f r i e s , Va . Sandy Run at Henderson Road near Sandy Run at Henderson Road near Sandy Run at Henderson Road near Hooes Run above Route 641 near Oc Hooes Run above Route 641 near Oc Hooes Run above Route 641 near Oc Woodbridge, Giles Run at Route 1 near Woodbridge, Giles Run at Route 1 near Woodbridge, Giles Run at Route 1 near Quantico Creek at pyrite mine road near Quantico Creek at pyrite mine road near Quantico Creek at pyrite mine road near South Fork Quantico Creek at Route 619 South Fork Quantico Creek at Route 619 South Fork Quantico Creek at Route 619 South Fork Quantico Creek at Camp 5 South Fork Quantico Creek at Camp 5 South Fork Quantico Creek at Camp 5 South Fork Quantico Creek above mouth South Fork Quantico Creek above mouth (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01657600 01657600 01657600 01657655 01657655 01657655 01657800 01657800 01657800 01658480 01658480 01658480 01658500 01658500 01658500 01658550 01658550 01658550 01658650 01658650 Table 2. Table [mi 44 Peak-Flow Characteristics of Virginia Streams ------500 0.002 972 6,393 3,063 5,627 1,308 4,120 1,616 4,349 ------200 0.005 819 4,221 2,103 3,756 1,057 2,823 1,375 3,029 ------100 0.01 713 889 1,592 2,054 3,365 1,235 1,554 2,987 2,405 2,231 ------50 0.02 755 985 614 738 2,556 1,076 1,125 2,246 1,831 1,637 /s) 3 ------25 0.04 579 760 521 886 793 603 2,014 1,777 1,400 1,309 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 440 580 406 703 470 937 444 847 1,325 1,163 ------5 0.2 321 426 323 904 522 294 790 626 336 569 ------2.33 0.4292 201 269 231 527 330 151 458 342 224 325 ------2 0.5 211 132 178 441 287 127 382 282 202 268
) 2 2.06 2.06 2.06 3.28 3.28 3.28 5.69 5.69 5.69 4.46 4.46 4.46 2.46 2.46 16.7 (mi area Drainage - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 n e a r D u m f r i e s , Va . Triangle, Va. Triangle, Va. Triangle, Va. Va. Va. Va. Marine Road 1 near Independent Hill, Va. Marine Road 1 near Independent Hill, Va. Marine Road 1 near Independent Hill, Va. above Marine Road near Garrisonville, Va. above Marine Road near Garrisonville, Va. above Marine Road near Garrisonville, Va. below Marine Road 1 near Garrison ville, Va. below Marine Road 1 near Garrison ville, Va. South Fork Quantico Creek above mouth Little Creek at Mocking Bird Road Little Creek at Mocking Bird Road Little Creek at Mocking Bird Road Little Creek at Geiger Road Quantico, Little Creek at Geiger Road Quantico, Little Creek at Geiger Road Quantico, above Creek Chopawamsic Branch North above Creek Chopawamsic Branch North above Creek Chopawamsic Branch North Middle Branch Chopawamsic Creek Middle Branch Chopawamsic Creek Middle Branch Chopawamsic Creek South Branch Chopawamsic Creek South Branch Chopawamsic Creek (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01658650 01658698 01658698 01658698 01658705 01658705 01658705 01659000 01659000 01659000 01659500 01659500 01659500 01660000 01660000 Table 2. Table [mi Table 2 45 ------500 0.002 1928.40 1,530 9,935 2,425 2,462 2,362 1,907 13,016 13,169 22,850 16,561 20,079 15,410 12,919 ------200 0.005 1549.78 1,359 8,097 1,699 8,184 9,713 6,322 2,049 2,007 1,686 1,619 7,986 15,470 10,096 12,735 -- -- 100 0.01 1,322 1,236 6,543 1,574 6,615 8,196 9,679 6,725 5,083 1,798 3,120 1,741 1,290 3,056 1,241 5,849 11,420 -- -- 50 0.02 974 942 1,118 1,076 5,259 1,449 5,322 8,342 6,715 7,419 4,562 3,999 1,572 1,525 1,501 1,493 4,248 /s) 3 -- -- 25 0.04 870 723 698 1,004 4,046 1,268 4,093 6,014 5,124 5,516 3,012 3,104 1,368 1,185 1,282 1,159 3,062 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 631 857 912 469 892 449 2,735 1,095 2,768 3,787 3,496 3,606 1,638 2,077 1,127 1,026 1,894 -- -- 5 0.2 911 449 745 959 960 677 853 322 662 305 1,909 1,932 2,574 2,459 2,503 1,437 1,229 ------2.33 0.4292 271 612 691 457 856 784 434 193 424 658 1,152 1,167 1,563 1,502 1,527 ------2 0.5 233 583 987 641 379 727 748 291 170 284 548 1,000 1,389 1,296 1,336
) 2 2.46 7.03 7.03 7.03 6.77 6.77 6.77 22.1 22.1 22.1 22.6 22.6 22.6 35 35 35 13.2 13.2 13.2 (mi area Drainage - - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 below Marine Road 1 near Garrison ville, Va. near Joplin, Va. near Joplin, Va. near Joplin, Va. Joplin, Va. Joplin, Va. Joplin, Va. risonville, Va. risonville, Va. risonville, Va. G a r r i s o n v i l l e , Va . G a r r i s o n v i l l e , Va . G a r r i s o n v i l l e , Va . Horse Head, Va. Horse Head, Va. Horse Head, Va. Heathsville, Va. Heathsville, Va. Heathsville, Va. South Branch Chopawamsic Creek Chopawamsic Creek at Russell Road Chopawamsic Creek at Russell Road Chopawamsic Creek at Russell Road Chopawamsic Creek at Interstate 95 near Chopawamsic Creek at Interstate 95 near Chopawamsic Creek at Interstate 95 near Aquia Creek at Route 641 near Gar Aquia Creek at Route 641 near Gar Aquia Creek at Route 641 near Gar Beaverdam Run at Marine Road 2 near Beaverdam Run at Marine Road 2 near Beaverdam Run at Marine Road 2 near River at Route 604 near Wicomico Great River at Route 604 near Wicomico Great River at Route 604 near Wicomico Great Bush Mill Stream at Route 601 near Bush Mill Stream at Route 601 near Bush Mill Stream at Route 601 near (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01660000 01660100 01660100 01660100 01660110 01660110 01660110 01660400 01660400 01660400 01660500 01660500 01660500 01661600 01661600 01661600 01661800 01661800 01661800 Table 2. Table [mi 46 Peak-Flow Characteristics of Virginia Streams ------500 44.3 0.002 417 8,152 17,360 48,520 32,670 158,300 200 38.5 95.8 0.005 326 362 712 2,334 5,629 9,349 6,920 11,375 12,740 12,143 36,180 42,744 38,656 21,600 13,055 16,763 35,048 102,900 100 34.4 0.01 87.8 267 279 621 9,952 9,133 9,563 1,841 4,209 7,490 5,447 28,620 34,833 31,185 15,570 10,498 12,562 73,250 28,498 50 30.6 0.02 73.9 216 183 513 3,111 7,657 6,866 7,244 1,301 5,588 4,151 7,935 9,092 11,050 22,320 27,584 24,718 51,330 22,392 /s) 3 25 26.9 0.04 62.9 172 953 129 427 5,777 5,209 5,452 2,264 4,221 3,173 7,673 6,038 6,588 17,090 21,549 19,332 35,240 17,416 Peak flow (ft Return period (years) Exceedance probability 10 0.1 22.3 76.6 47.6 123 599 320 3,810 3,438 3,571 1,437 2,769 2,150 4,519 4,002 4,150 11,520 11,900 14,813 13,409 20,470 5 0.2 90.9 19.0 45.6 34.2 381 977 234 2,635 2,317 2,412 8,125 9,604 1,853 1,500 2,857 2,710 2,746 8,347 10,465 12,840 59.4 15.1 21.5 2.33 19.5 0.4292 199 586 890 141 1,571 1,321 1,382 4,981 6,412 5,966 1,045 1,531 1,556 1,551 6,840 5,060 2 0.5 53.3 14.2 17.6 16.6 167 518 896 773 122 1,377 1,136 1,194 4,399 5,632 5,259 1,312 1,342 1,336 5,861 4,430
) 2 1.37 1.37 1.37 20.4 20.4 20.4 14.6 14.6 14.6 25.8 25.8 25.8 0.057 0.057 0.057 195 195 195 139 139 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. Va. Warrenton, Va. Warrenton, Va. Warrenton, Va. n e a r T h o r n t o n G a p ,n e Va a . r T h o r n t o n G a p ,n e Va a . r T h o r n t o n G a p ,ton, Va .Va. ton, Va. ton, Va. Washington, Va. Washington, Va. Washington, Va. Mills, Va. Mills, Va. Mills, Va. Mills, Va. Mills, Va. Carter Run off Route 691 near Marshall, Carter Run off Route 691 near Marshall, Carter Run off Route 691 near Marshall, Carter Run off near Rappahannock River at Route 211 near Rappahannock River at Route 211 near Rappahannock River at Route 211 Thornton River tributary at Route 211 Thornton River tributary at Route 211 Thornton River tributary at Route 211 Washing Rush River at old Route 522 Washing Rush River at old Route 522 Washing Rush River at old Route 522 Rush River tributary at Route 522 near Rush River tributary at Route 522 near Rush River tributary at Route 522 near Battle Run at Route 729 near Laurel Battle Run at Route 729 near Laurel Battle Run at Route 729 near Laurel Thornton River at Route 729 near Laurel Thornton River at Route 729 near Laurel (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01661900 01661900 01661900 01662000 01662000 01662000 01662300 01662300 01662300 01662500 01662500 01662500 01662600 01662600 01662600 01662800 01662800 01662800 01663000 01663000 Table 2. Table [mi Table 2 47 ------500 0.002 988 920 8,718 3,995 5,417 32,790 106,900 119,900 194,700 -- 200 0.005 936 959 676 7,317 5,515 2,744 3,477 9,901 59,167 75,710 53,398 65,739 90,590 84,149 88,141 85,890 22,850 133,900 111,125 100 0.01 897 921 528 5,528 3,828 2,168 2,574 7,937 43,387 57,670 43,624 50,939 72,430 69,099 71,043 99,710 70,545 85,026 17,050 10,641 50 0.02 857 881 405 1,811 3,944 2,603 1,587 5,935 7,642 31,234 43,380 34,849 38,969 57,150 56,193 56,712 73,330 57,415 64,799 12,440 /s) 3 25 0.04 816 840 303 2,781 1,723 1,270 1,378 8,823 4,488 5,491 22,356 32,090 27,359 29,444 44,330 44,563 44,447 53,040 45,553 48,743 Peak flow (ft Return period (years) Exceedance probability 10 0.1 759 779 939 821 845 197 1,625 5,248 2,950 3,388 13,927 20,770 18,936 19,628 30,480 31,277 30,938 33,320 31,992 32,482 5 0.2 712 723 551 551 551 134 9,265 1,007 3,271 1,978 2,185 14,280 13,485 13,744 21,900 22,639 22,367 22,400 23,173 22,924 76.5 2.33 0.4292 651 523 645 263 314 301 1,119 5,373 8,620 8,364 8,434 1,645 1,191 13,800 14,394 14,208 13,190 14,750 14,317 2 0.5 66.2 637 441 626 218 259 248 961 4,676 7,615 7,370 7,436 1,374 1,016 11,590 12,280 12,773 12,624 13,094 12,687
) 2 7.75 7.75 7.75 2.32 2.32 2.32 0.28 16.1 16.1 16.1 139 285 285 285 619 619 619 641 641 641 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Mills, Va. Va. Va. Va. n a t e ) a t R e m i n g t o nn , a t Va e ) . a t R e m i n g t o nn , a t Va e ) . a t R e m i n g t o nK , e l Va l . y s F o r d nK e e a l r l y R s e m F i o n r g d t o n nK e , e a l r Va l . y R s e m F i o n r g d t o n nVa. e , a r Va . R e m i n g t o nVa. , Va . Va. ville, Va. ville, Va. ville, Va. peper, Va. peper, Va. peper, Va. Culpeper, Va. Thornton River at Route 729 near Laurel Hazel River at Route 229 Rixeyville, Hazel River at Route 229 Rixeyville, Hazel River at Route 229 Rixeyville, Rappahannock River at Route 29 (Alter Rappahannock River at Route 29 (Alter Rappahannock River at Route 29 (Alter Rappahannock River at Route 620 Rappahannock River at Route 620 Rappahannock River at Route 620 Browns Run at Route 17 near Bealeton, Browns Run at Route 17 near Bealeton, Browns Run at Route 17 near Bealeton, Harpers Run at Route 17 near Morris Harpers Run at Route 17 near Morris Harpers Run at Route 17 near Morris Mountain Run at Route 641 near Cul Mountain Run at Route 641 near Cul Mountain Run at Route 641 near Cul Pony Mountain Branch at Route 3 near (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01663000 01663500 01663500 01663500 01664000 01664000 01664000 01664500 01664500 01664500 01664700 01664700 01664700 01664800 01664800 01664800 01665000 01665000 01665000 01665050 Table 2. Table [mi 48 Peak-Flow Characteristics of Virginia Streams ------500 0.002 2,763 2,597 2,663 69,670 143,200 ------200 0.005 892 1,297 1,761 1,850 1,818 13,114 10,911 16,281 93,100 31,361 51,048 52,910 40,651 46,720 ------100 0.01 929 692 1,231 1,449 8,756 1,377 66,110 13,125 10,546 25,468 37,567 42,290 33,109 37,299 ------50 0.02 612 846 505 972 1,025 7,973 6,572 10,007 46,100 19,925 27,055 33,200 26,167 29,070 /s) 3 ------25 0.04 397 567 833 356 748 7,652 6,068 4,981 31,370 15,459 19,385 25,460 20,419 22,271 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 205 317 529 202 472 5,107 4,022 3,284 17,880 10,526 12,076 17,010 14,015 14,927 ------5 0.2 112 191 351 118 118 306 3,485 2,724 2,209 7,354 8,008 9,883 11,750 10,930 10,364 ------50.0 95.2 2.33 55.5 0.4292 196 164 6,211 2,026 1,565 1,256 5,553 4,431 4,610 6,830 6,039 ------2 0.5 40.1 80.1 45.4 159 133 1,753 1,350 1,081 4,688 3,873 4,001 5,920 5,300 5,431
) 2 0.28 0.28 1.02 1.02 1.02 37.6 37.6 37.6 26 26 26 19 19 19 115 115 115 179 179 179 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Culpeper, Va. Culpeper, Va. Goldvein, Va. Goldvein, Va. Goldvein, Va. nardsville, Va. nardsville, Va. nardsville, Va. nardsville, Va. nardsville, Va. nardsville, Va. ville, Va. ville, Va. ville, Va. R u c k e r s v i l l e , Va . R u c k e r s v i l l e , Va . R u c k e r s v i l l e , Va . 6 1 4 n e a r L o c u s t 6 D 1 a 4 l e n , e a Va r . L o c u s t 6 D 1 a 4 l e n , e a Va r . L o c u s t D a l e , Va . Pony Mountain Branch at Route 3 near Pony Mountain Branch at Route 3 near Rock Run tributary 2 at Route 17 near Rock Run tributary 2 at Route 17 near Rock Run tributary 2 at Route 17 near Rapidan River at Route 230 near Sta Rapidan River at Route 230 near Sta Rapidan River at Route 230 near Sta Conway River at Route 230 near Sta Conway River at Route 230 near Sta Conway River at Route 230 near Sta South River at Route 230 near Stanards South River at Route 230 near Stanards South River at Route 230 near Stanards Rapidan River below Route 29 near Rapidan River below Route 29 near Rapidan River below Route 29 near Robinson (Robertson) River at Route Robinson (Robertson) River at Route Robinson (Robertson) River at Route (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01665050 01665050 01665200 01665200 01665200 01665300 01665300 01665300 01665400 01665400 01665400 01665450 01665450 01665450 01665500 01665500 01665500 01666500 01666500 01666500 Table 2. Table [mi Table 2 49 ------500 0.002 243 1,627 1,884 1,243 1,642 1,723 14,953 127,300 120,200 112,200 28,993 162,200 200 0.005 214 900 877 780 415 986 2,044 9,194 1,056 90,000 69,342 80,070 89,460 71,422 81,150 66,100 16,025 132,800 146,588 136,650 100 0.01 192 752 693 664 599 384 724 1,485 7,449 11,538 68,290 56,817 62,413 70,550 58,540 64,582 43,380 113,000 121,126 115,573 50 0.02 171 999 529 528 496 455 342 529 6,054 8,446 51,040 45,855 48,200 54,770 47,301 50,758 27,820 94,970 97,013 100,670 /s) 3 25 0.04 151 662 365 387 363 332 295 376 4,636 6,181 37,390 36,209 36,696 41,660 37,375 39,168 17,310 78,610 80,823 79,515 Peak flow (ft Return period (years) Exceedance probability 10 0.1 125 353 215 244 231 208 220 230 8,636 3,150 3,750 23,710 25,263 24,713 27,720 26,101 26,674 59,140 57,701 58,437 5 0.2 105 200 138 161 155 137 155 149 4,696 2,209 2,513 15,900 18,160 17,465 19,250 18,781 18,924 45,690 42,603 43,977 ------82.0 92.7 76.2 90.0 2.33 88.6 0.4292 9,155 2,023 1,342 1,452 11,425 11,460 11,835 11,738 10,822 31,460 27,921 29,261 ------2 0.5 76.8 75.2 66.1 78.5 75.8 7,970 9,554 1,637 1,155 1,239 10,109 10,030 10,476 10,363 28,550 24,989 26,297
) 2.8 2.8 2.8 2 0.67 0.67 0.67 2.18 2.18 28.8 28.8 28.8 445 445 445 468 468 468 (mi area 1,595 1,595 1,595 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Rapidan, Va. Rapidan, Va. Rapidan, Va. Culpeper, Va. Culpeper, Va. Culpeper, Va. Culpeper, Va. Culpeper, Va. Culpeper, Va. Hill, Va. Hill, Va. Hill, Va. n e a r F r e d e r i c k s b un r e g a , r Va F . r e d e r i c k s b un r e g a , r Va F . r e d e r i c k s b uRoyal, r g , Va. Va . Royal, Va. Royal, Va. Champlain, Va. Champlain, Va. Rapidan River below Route 615 at Rapidan River below Route 615 at Rapidan River below Route 615 at Rapidan River above Route 522 near Rapidan River above Route 522 near Rapidan River above Route 522 near Cedar Run tributary at Route 522 near Cedar Run tributary at Route 522 near Cedar Run tributary at Route 522 near near Burr Mountain Run at Route 611 near Burr Mountain Run at Route 611 near Burr Mountain Run at Route 611 Rappahannock River below Motts Run Rappahannock River below Motts Run Rappahannock River below Motts Run Gingoteague Run at Route 623 near Port Gingoteague Run at Route 623 near Port Gingoteague Run at Route 623 near Port Farmers Hall Creek at Route 17 near Farmers Hall Creek at Route 17 near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01667000 01667000 01667000 01667500 01667500 01667500 01667600 01667600 01667600 01667870 01667870 01667870 01668000 01668000 01668000 01668200 01668200 01668200 01668300 01668300 Table 2. Table [mi 50 Peak-Flow Characteristics of Virginia Streams 500 0.002 635 806 8,692 1,061 4,795 3,926 6,640 4,678 1,299 1,092 1,386 1,473 17,090 13,430 12,306 15,060 14,012 14,735 13,112 13,112 12,980 200 0.005 832 426 610 866 834 486 4,452 7,526 2,390 1,077 2,900 3,360 3,062 9,086 6,404 7,826 7,336 9,438 11,170 10,720 100 0.01 311 685 895 466 721 633 365 7,987 3,525 5,497 1,872 2,273 2,647 2,414 6,661 5,103 5,902 8,187 5,859 7,256 50 0.02 558 734 224 353 596 476 271 5,625 2,770 3,996 1,453 1,754 2,069 1,880 4,803 4,037 4,419 6,172 4,648 5,533 /s) 3 25 0.04 447 587 158 256 487 347 195 2,115 3,113 3,884 2,859 1,092 1,326 1,568 1,428 3,390 3,248 4,573 3,596 4,148 Peak flow (ft Return period (years) Exceedance probability 10 0.1 96.3 324 709 416 875 942 159 365 219 121 2,277 1,398 1,765 1,028 2,037 2,080 2,059 2,959 2,412 2,714 5 0.2 63.0 79.3 969 243 482 303 604 706 649 104 284 145 1,439 1,170 1,306 1,458 1,383 2,030 1,699 1,882 ------35.7 2.33 0.4292 777 164 357 708 204 1,216 ------2 0.5 31.1 668 148 312 608 188 1,071
) 2 2.18 1.42 1.42 1.42 4.92 45.6 45.6 45.6 15.4 15.4 15.4 27.9 27.9 27.9 86 86 86 109 109 109 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Champlain, Va. Montross, Va. Montross, Va. Montross, Va. pahannock, Va. pahannock, Va. pahannock, Va. pahannock, Va. pahannock, Va. pahannock, Va. Cross, Va. Cross, Va. Cross, Va. C h u r c h Vi e w, Va . C h u r c h Vi e w, Va . C h u r c h Vi e w, Va . Va. Va. Va. Saluda, Va. Farmers Hall Creek at Route 17 near Cat Point Creek below Route 637 near Cat Point Creek below Route 637 near Cat Point Creek below Route 637 near Tap Hoskins Creek at Route 717 near Tap Hoskins Creek at Route 717 near Tap Hoskins Creek at Route 717 near Tap Piscataway Creek at Route 691 near Tap Piscataway Creek at Route 691 near Tap Piscataway Creek at Route 691 near Swamp at Route 17 near Center Yorkers Swamp at Route 17 near Center Yorkers Swamp at Route 17 near Center Yorkers Dragon Swamp at Route 602 near Dragon Swamp at Route 602 near Dragon Swamp at Route 602 near Dragon Swamp at Route 603 Mascot, Dragon Swamp at Route 603 Mascot, Dragon Swamp at Route 603 Mascot, My Ladys Swamp at Route 629 near (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01668300 01668500 01668500 01668500 01668800 01668800 01668800 01669000 01669000 01669000 01669300 01669300 01669300 01669500 01669500 01669500 01669520 01669520 01669520 01669800 Table 2. Table [mi Table 2 51 ------500 0.002 2,566 1,243 1,871 3,149 2,305 1,635 6,328 9,050 19,940 18,199 12,750 54,680 49,100 62,398 19,259 53,222 ------200 0.005 922 997 1,243 1,353 1,540 1,432 1,338 7,984 4,182 5,614 1,109 11,007 14,350 12,791 30,153 37,050 34,030 35,849 ------100 0.01 963 762 674 805 1,110 4,114 1,040 1,197 1,048 8,951 5,544 3,333 11,070 10,005 25,042 29,650 28,333 29,078 ------50 0.02 738 623 785 921 850 447 725 554 8,447 7,389 7,882 3,804 2,530 2,946 22,560 23,470 25,794 24,536 /s) 3 ------25 0.04 545 499 578 684 631 289 524 388 6,348 5,621 5,960 2,570 1,994 2,192 16,538 18,310 18,825 18,550 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 347 360 365 438 402 153 324 234 1,311 4,209 3,848 3,992 1,478 1,361 11,808 12,780 13,508 13,170 ------5 0.2 88.6 231 271 241 294 268 202 933 894 906 149 2,960 2,715 2,813 8,635 9,355 9,921 9,660 ------41.9 77.2 2.33 0.4292 132 103 515 521 519 1,847 1,666 1,743 5,583 6,122 6,455 6,290 ------2 0.5 34.8 85.4 64.8 113 448 436 440 1,646 1,442 1,532 5,008 5,512 5,815 5,660
) 2 4.92 4.92 7.15 7.15 7.15 0.53 0.53 0.53 5.58 5.58 5.58 41.9 41.9 41.9 342 342 342 440 440 440 462 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Saluda, Va. Saluda, Va. near Ark, Va. near Ark, Va. near Ark, Va. ville, Va. ville, Va. ville, Va. Va. Va. Va. Mineral, Va. Mineral, Va. Mineral, Va. Partlow, Va. Partlow, Va. Partlow, Va. C o r n e r, n e a r D o s w e l l , Va . My Ladys Swamp at Route 629 near My Ladys Swamp at Route 629 near Beaverdam Swamp above Route 606 Beaverdam Swamp above Route 606 Beaverdam Swamp above Route 606 Mountain Run tributary near Gordons Mountain Run tributary near Gordons Mountain Run tributary near Gordons Pamunkey Creek at Route 669 Lahore, Pamunkey Creek at Route 669 Lahore, Pamunkey Creek at Route 669 Lahore, Contrary Creek below Route 522 near Contrary Creek below Route 522 near Contrary Creek below Route 522 near Anna River at Route 601 near North Anna River at Route 601 near North Anna River at Route 601 near North N o r t h A N n o n r a t h R i A N v n o e n r r a t h n R eAnna River at Route 30 Hart North i A a v n r e n r a D o n R s e i w a v e r e l r l D , o n s e Va w a e . r l l D , o s Va w e . l l , Va . (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01669800 01669800 01670000 01670000 01670000 01670100 01670100 01670100 01670180 01670180 01670180 01670300 01670300 01670300 01670400 01670400 01670400 01671000 01671000 01671000 01671020 Table 2. Table [mi 52 Peak-Flow Characteristics of Virginia Streams ------500 0.002 6,568 5,547 6,070 3,026 1,984 5,553 4,595 7,274 4,903 6,244 2,410 5,046 24,011 64,014 64,376 18,740 29,744 ------200 0.005 3,311 4,201 3,707 3,935 2,022 1,445 1,657 4,021 3,120 3,487 5,109 4,220 16,115 34,836 35,016 14,590 17,263 ------100 0.01 2,965 2,947 2,955 1,467 1,127 1,241 3,099 2,471 2,704 3,873 2,626 3,210 11,850 29,018 29,172 14,171 13,267 ------50 0.02 780 859 9,427 2,069 2,214 2,155 1,047 2,346 1,829 1,999 2,903 1,953 2,358 11,182 26,472 26,624 12,164 /s) 3 ------25 0.04 730 639 668 1,811 7,302 9,101 8,463 1,423 1,753 1,614 1,735 1,457 1,551 2,146 1,553 19,303 19,410 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 839 431 402 410 946 990 1,011 4,901 6,349 5,921 1,147 1,035 1,104 1,393 1,151 13,865 13,945 ------5 0.2 540 778 691 272 264 266 735 639 665 966 684 785 3,360 4,552 4,198 10,191 10,252 ------2.33 0.4292 306 451 393 144 146 145 410 367 380 596 394 471 6,639 6,680 1,891 2,858 2,531 ------2 0.5 117 119 267 376 331 123 352 304 319 530 327 406 5,986 6,024 1,617 2,514 2,195
) 2 4.34 4.34 4.34 0.61 0.61 0.61 3.03 3.03 3.03 3.43 3.43 3.43 462 462 467 467 467 107 107 107 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 C o r n e r, n e a r D o s wC e o l r l n , e r, Va . n e a r D o s wDoswell, e l l , VaVa. . Doswell, Va. Doswell, Va. Va. Va. Va. B o s w e l l s Ta v e r n , Va .B o s w e l l s Ta v e r n , Va .B o s w e l l s Ta v e r n , Va .cliff, Va. cliff, Va. cliff, Va. near Louisa, Va. near Louisa, Va. near Louisa, Va. ians, Va. ians, Va. ians, Va. North Anna River at Route 30 Hart North Anna River at Route 30 Hart North near River Little above River Anna North near River Little above River Anna North near River Little above River Anna North Little River at Route 685 near Doswell, Little River at Route 685 near Doswell, Little River at Route 685 near Doswell, Bunch (Hudson) Creek at Route 15 near Bunch (Hudson) Creek at Route 15 near Bunch (Hudson) Creek at Route 15 near Fosters Creek at Route 250 near Fern Fosters Creek at Route 250 near Fern Fosters Creek at Route 250 near Fern Creek at Route 632 (Waldrops) Waldrop Creek at Route 632 (Waldrops) Waldrop Creek at Route 632 (Waldrops) Waldrop Trevil Harris Creek at Route 632 near Trevil Harris Creek at Route 632 near Trevil Harris Creek at Route 632 near (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01671020 01671020 01671025 01671025 01671025 01671100 01671100 01671100 01671500 01671500 01671500 01671615 01671615 01671615 01671650 01671650 01671650 01671750 01671750 01671750 Table 2. Table [mi Table 2 53 500 0.002 584 748 961 785 5,168 1,293 2,800 6,321 3,531 3,425 1,599 11,559 28,350 58,968 62,080 99,791 17,560 27,830 34,916 71,161 200 0.005 264 472 445 938 466 2,792 1,362 1,052 3,191 6,057 1,736 1,688 21,710 32,312 24,770 47,540 52,319 49,091 10,170 14,530 100 0.01 199 330 339 728 824 332 1,713 1,056 6,658 2,512 4,191 8,659 1,352 1,038 17,600 26,874 20,589 38,530 43,952 40,476 50 0.02 811 148 228 255 558 637 630 234 1,025 4,303 1,961 2,904 5,012 1,043 14,130 24,356 17,669 30,940 41,534 34,955 /s) 3 25 0.04 593 105 155 183 421 601 481 777 373 162 2,737 1,485 1,988 2,792 11,220 17,809 13,564 24,550 29,838 26,616 Peak flow (ft Return period (years) Exceedance probability 10 0.1 63.9 89.3 95.5 113 267 280 383 317 972 500 178 8,055 1,451 1,168 1,183 12,752 10,052 17,590 21,798 19,523 5 0.2 40.5 56.4 72.9 60.7 95.3 134 197 256 218 858 667 748 556 336 6,069 9,348 7,485 13,220 16,254 14,626 ------51.7 31.1 2.33 0.4292 122 440 195 9,011 4,160 6,066 4,931 9,791 10,817 ------2 0.5 40.8 27.0 109 377 150 3,794 5,455 4,445 8,207 9,893 8,910
) 2 0.33 0.33 0.33 0.82 0.82 0.82 5.77 5.77 5.77 8.81 8.81 25.5 25.5 25.5 395 395 395 (mi area 1,078 1,078 1,078 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 near Ashland, Va. near Ashland, Va. near Ashland, Va. Ashland, Va. Ashland, Va. Ashland, Va. n e a r H a n o v e r, Va . n e a r H a n o v e r, Va . n e a r H a n o v e r, Va . Hanover, Va. Hanover, Va. Hanover, Va. Atlee, Va. Atlee, Va. Atlee, Va. Studley, Va. Studley, Va. Studley, Va. Va. Va. South Anna River tributary 6 at Route 54 South Anna River tributary 6 at Route 54 South Anna River tributary 6 at Route 54 South Anna River at Route 54 near South Anna River at Route 54 near South Anna River at Route 54 near South Pamunkey River tributary 1 at Route 301 Pamunkey River tributary 1 at Route 301 Pamunkey River tributary 1 at Route 301 Pamunkey River at Route 614 near Pamunkey River at Route 614 near Pamunkey River at Route 614 near Creek at Route 301 near Totopotomoy Creek at Route 301 near Totopotomoy Creek at Route 301 near Totopotomoy Creek at Route 606 near Totopotomoy Creek at Route 606 near Totopotomoy Creek at Route 606 near Totopotomoy Cohoke Mill Creek near Lester Manor, Cohoke Mill Creek near Lester Manor, (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01672400 01672400 01672400 01672500 01672500 01672500 01672900 01672900 01672900 01673000 01673000 01673000 01673500 01673500 01673500 01673550 01673550 01673550 01673638 01673638 Table 2. Table [mi 54 Peak-Flow Characteristics of Virginia Streams -- -- 500 72.2 0.002 2,411 7,325 3,347 1,396 1,495 5,143 1,834 1,898 3,001 2,084 1,099 2,935 1,343 18,060 25,136 20,387 22,320 46,981 25,170 35,745 30,769 27,700 200 65.3 0.005 658 754 916 874 152 3,418 2,161 1,324 1,084 2,572 1,275 1,452 1,465 1,455 1,431 13,550 14,796 14,059 18,260 26,239 21,781 20,200 19,530 19,993 100 60.3 0.01 504 941 845 560 724 665 149 1,111 1,011 2,339 1,534 2,017 1,176 1,137 1,166 11,379 18,511 10,790 12,107 15,460 21,729 16,880 15,867 16,540 50 55.4 0.02 381 664 656 796 943 875 924 410 854 572 500 147 1,604 8,491 9,337 1,073 1,568 10,254 12,870 19,341 16,237 13,890 12,826 13,506 /s) 3 25 50.6 0.04 738 277 458 505 618 746 649 717 296 633 430 368 140 1,080 6,580 7,716 7,129 1,180 11,210 10,480 14,251 12,489 10,181 10,815 Peak flow (ft Return period (years) Exceedance probability 10 0.1 44.2 616 432 173 272 352 768 428 533 415 494 184 405 279 234 122 4,537 5,348 4,987 7,592 9,122 8,083 7,031 7,656 10,116 5 0.2 39.3 98.5 113 380 274 175 263 523 313 399 278 357 123 271 185 156 3,283 3,813 3,580 5,592 7,361 6,673 5,975 5,106 5,619 ------71.1 33.3 99.9 63.4 2.33 0.4292 151 183 270 2,107 2,375 2,249 3,502 4,725 4,204 3,823 ------2 0.5 62.2 32.0 85.2 56.0 130 169 246 1,886 2,078 1,985 3,083 4,218 3,716 3,396
) 2 8.81 1.62 1.62 1.62 6.55 6.55 6.55 6.29 6.29 6.29 0.68 0.68 0.68 77.6 77.6 77.6 17.5 17.5 17.5 256 256 256 602 602 602 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. Va. Va. B o w l i n g G r e e n , Va . B o w l i n g G r e e n , Va . B o w l i n g G r e e n , Va . Cedon, Va. Cedon, Va. Cedon, Va. Va. Va. Va. Cohoke Mill Creek near Lester Manor, Cohoke Mill Creek near Lester Manor, Po River at Route 208 near Spotsylvania, Po River at Route 208 near Spotsylvania, Po River at Route 208 near Spotsylvania, Mattaponi River above Route 605 near Mattaponi River above Route 605 near Mattaponi River above Route 605 near Motto River tributary at Route 605 near Motto River tributary at Route 605 near Motto River tributary at Route 605 near Reedy Creek at Route 301 near Dawn, Reedy Creek at Route 301 near Dawn, Reedy Creek at Route 301 near Dawn, M a t t a p o M n a i t t R a i p v o M e n a r i t t n R a e i p a v A o y r e n l r i e B t e n R u t e i l a v A a C y r e h r l r v e e B i e t e n l k u t e l l a A e a a C y r , h t r l v e e B Va i R e t e l o k u t . l u l W e t a a C a , e h t r r v e e Va i 3 R e l 6 o k . C l 0 u r W e t a a e , a e t r e t e k Va 3 R A 6 o . y C a 0 u l r W t t e a e a e t r e R t t e k o 3 , A u 6 y C a t 0 Va l r C t e e e . a a t e t R t 6 t k t o 0 , A a u 0 y a i t Va l C t l e n e . a e t t R R 6 a t t u o 0 , r a n u 0 i t Va T C l a e o n . a t a e t R 6 n a t u R 0 o r a n o 0 , i u T l a t o V n a t e a e . R n a u R 2 o r n o 2 , u 0 T a t o V a t e a n . n e R 2 a o o 2 r , u 0 t B V a e n o . e l 2 a a 2 r r 0 , B V n o a e l . a a r r , B V o a l . a r , V a . (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 01673638 01673800 01673800 01673800 01674000 01674000 01674000 01674100 01674100 01674100 01674200 01674200 01674200 01674500 01674500 01674500 01674700 01674700 01674700 01677000 01677000 01677000 02009500 02009500 02009500 Table 2. Table [mi Table 2 55 ------500 0.002 1,301 42,930 25,030 14,740 20,720 18,630 ------200 0.005 3,014 1,053 31,040 24,385 28,282 18,960 13,776 16,995 15,695 12,920 17,270 13,701 18,300 22,164 19,179 17,660 39,202 22,298 ------100 0.01 890 2,440 11,496 11,590 24,050 20,582 22,475 15,220 13,643 13,131 14,477 12,218 16,500 18,671 17,091 16,910 33,401 21,261 ------50 0.02 746 9,532 1,968 18,430 17,244 17,839 12,090 10,880 10,913 10,310 12,053 10,770 14,710 15,616 15,005 16,130 28,228 20,037 /s) 3 ------25 0.04 618 9,474 7,704 8,539 8,851 9,058 9,801 9,296 1,528 13,920 14,150 14,046 12,930 12,782 12,873 15,340 23,457 18,531 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 470 7,113 9,297 9,973 6,649 5,543 5,985 6,401 7,426 7,299 1,037 9,365 9,992 10,406 10,560 14,210 17,565 15,870 ------5 0.2 720 370 6,585 7,852 7,399 4,896 4,089 4,379 4,746 6,177 5,294 5,770 8,695 7,040 7,819 13,260 13,507 13,399 ------2.33 0.4292 418 267 3,411 4,153 5,164 4,791 3,230 2,599 2,828 3,040 4,698 4,088 6,447 4,604 5,457 9,139 12,000 10,315 ------2 0.5 362 246 3,712 4,598 4,259 2,914 2,297 2,527 2,691 4,367 3,023 3,741 5,941 4,094 4,966 8,189 9,639 11,690
) 4.9 4.9 4.9 2 11.2 60.9 60.9 60.9 75.6 75.6 75.6 88.6 88.6 88.6 157 157 157 134 134 134 345 345 345 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Bacova, Va. Bacova, Va. Bacova, Va. Sunrise, Va. Sunrise, Va. Sunrise, Va. tain Grove, Va. tain Grove, Va. tain Grove, Va. tain Grove, Va. tain Grove, Va. tain Grove, Va. n e a r H o t S p r i n g s , n Va e . a r H o t S p r i n g s , n Va e . a r H o t S p r i n g s , F Va a . l l i n g S p r i n g , Va . Jackson River along Route 603 near Jackson River along Route 603 near Jackson River along Route 603 near Back Creek above Route 600 near Back Creek above Route 600 near Back Creek above Route 600 near B a c k C B r a e c e k k C a B r t a e c e R k k o u Back Creek on Route 600, near Moun C a t r t e e e R 6 k o 0 u 0 a t t e a t R 6 o 0 S u Back Creek on Route 600, near Moun 0 u t n e a r t i 6 s 0 S e 0 u , n a V r a t i . s S e Back Creek on Route 600, near Moun u , n V r a i . s e , V a . L i t t l e L B i a t c t k l e C L r B i e a t e c t k k l e n Back Creek along Route 39 near Moun C e r B a e a r e c k k S u n C n e r r a e i r e s k e S , u Back Creek along Route 39 near Moun n n Va e r a . i r s e S , u n Va r . i s e Back Creek along Route 39 near Moun , Va . Jackson River below Gathright Dam, Jackson River below Gathright Dam, Jackson River below Gathright Dam, Falling Spring Creek at Route 220 near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02011400 02011400 02011400 02011460 02011460 02011460 02011470 02011470 02011470 02011480 02011480 02011480 02011490 02011490 02011490 02011500 02011500 02011500 02011800 02011800 02011800 02012000 Table 2. Table [mi 56 Peak-Flow Characteristics of Virginia Streams ------500 0.002 1,892 3,170 33,980 31,240 53,940 18,540 200 0.005 4,962 1,553 1,251 1,056 2,516 5,251 3,340 1,199 30,690 43,502 33,987 25,630 24,851 25,354 47,030 55,387 15,820 24,009 18,144 49,334 100 0.01 891 837 875 4,058 1,383 2,088 4,298 2,857 28,100 37,142 30,864 21,810 20,982 21,476 42,130 47,517 13,870 20,257 15,987 43,870 50 0.02 616 662 631 3,302 1,234 1,708 3,502 2,427 25,410 31,449 27,599 18,320 17,586 17,984 37,470 40,412 12,000 16,967 13,919 38,584 /s) 3 25 0.04 410 500 443 2,598 1,087 1,373 2,759 2,013 11,873 22,600 26,206 24,139 15,120 14,438 14,767 33,020 33,892 10,210 13,918 33,405 Peak flow (ft Return period (years) Exceedance probability 10 0.1 881 219 326 988 264 1,798 7,939 9,157 1,913 1,491 11,300 18,640 19,702 19,186 10,625 10,899 27,380 25,715 10,229 26,499 5 0.2 696 122 217 733 164 1,273 8,641 8,023 8,248 6,259 7,714 7,101 1,358 1,102 15,350 15,213 15,273 23,160 20,048 21,352 51.3 78.2 2.33 118 0.4292 762 452 476 815 677 5,826 5,283 5,483 4,360 5,069 4,770 11,180 10,358 10,715 18,280 13,848 15,666 2 0.5 40.7 63.5 711 664 400 101 425 592 9,293 9,702 5,250 4,705 4,912 3,954 4,512 4,271 10,210 17,200 12,465 14,446
) 2 0.86 0.86 0.86 11.2 11.2 12.3 12.3 12.3 410 410 410 162 162 162 612 612 612 153 153 153 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 F a l l i n g S p r i n g , Va . F a l l i n g S p r i n g , Va . Spring, Va. Spring, Va. Spring, Va. 3 1 1 a t S w e e t C h3 a 1 l 1 y b a e t a t S e w , e e Va t . C h3 a 1 l 1 y b a e t a t S e w , e e Va t . C hton, a l y Va. b e a t e , Va . ton, Va. ton, Va. Covington, Va. Covington, Va. Covington, Va. Va. Va. Va. Forge, Va. Forge, Va. Forge, Va. Falling Spring Creek at Route 220 near Falling Spring Creek at Route 220 near Jackson River at Route 687 Falling Jackson River at Route 687 Falling Jackson River at Route 687 Falling Sweet Springs Creek tributary at Route Sweet Springs Creek tributary at Route Sweet Springs Creek tributary at Route Dunlap Creek at Route 60 near Coving Dunlap Creek at Route 60 near Coving Dunlap Creek at Route 60 near Coving Jackson River below Dunlap Creek, at Jackson River below Dunlap Creek, at Jackson River below Dunlap Creek, at Potts Creek at Route 18 near Covington, Potts Creek at Route 18 near Covington, Potts Creek at Route 18 near Covington, Smith Creek above old dam, near Clifton Smith Creek above old dam, near Clifton Smith Creek above old dam, near Clifton (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02012000 02012000 02012500 02012500 02012500 02012950 02012950 02012950 02013000 02013000 02013000 02013100 02013100 02013100 02014000 02014000 02014000 02014500 02014500 02014500 Table 2. Table [mi Table 2 57 ------500 0.002 976 1,042 13,060 33,300 44,800 90,930 40,590 200 0.005 778 815 788 787 7,941 4,962 6,015 5,504 1,360 25,740 19,677 23,526 38,420 46,689 40,361 81,660 90,081 83,735 30,220 19,892 100 0.01 615 643 664 623 5,373 4,058 4,491 4,510 1,235 20,970 16,537 19,153 33,880 39,919 35,550 74,540 78,033 75,558 23,970 16,721 50 0.02 479 506 555 488 3,577 3,302 3,386 3,677 1,125 16,910 13,801 15,479 29,570 33,844 30,964 67,280 66,955 67,168 18,830 13,958 /s) 3 25 0.04 365 380 457 371 2,331 2,598 2,525 2,901 1,013 11,261 11,392 13,440 12,315 25,440 28,255 26,520 59,850 56,882 58,646 14,620 Peak flow (ft Return period (years) Exceedance probability 10 0.1 243 245 344 843 244 9,611 1,263 1,798 1,670 8,213 8,788 2,015 8,312 20,220 21,299 20,722 49,580 43,967 46,831 10,160 5 0.2 749 169 162 268 673 165 1,273 1,156 7,172 6,145 6,526 1,433 7,464 6,222 16,340 16,493 16,418 41,240 34,948 37,855 86.8 93.5 2.33 0.4292 374 762 667 101 189 863 430 4,795 3,990 4,292 4,955 4,043 11,920 11,277 11,590 30,790 24,851 27,604 2 0.5 88.2 73.9 80.8 316 664 575 173 753 376 4,336 3,543 3,848 4,487 3,590 10,970 10,127 10,547 28,380 22,514 25,302
) 2 0.56 0.56 0.56 11.2 11.2 11.2 13.3 13.3 13.3 110 110 110 112 112 461 461 461 (mi area 1,371 1,371 1,371 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 H e a d Wa t e r s , Va . H e a d Wa t e r s , Va . H e a d Wa t e r s , Va . liamsville, Va. liamsville, Va. liamsville, Va. Forge, Va. Forge, Va. Forge, Va. C l i f t o n F o rg e , Va . C l i f t o n F o rg e , Va . C l i f t o n F o rg e , Va . Run, Va. Run, Va. Run, Va. Castle, Va. Castle, Va. Castle, Va. Va. Va. Cowpasture River at Route 250 near Cowpasture River at Route 250 near Cowpasture River at Route 250 near Wil Bullpasture River at Route 614 Wil Bullpasture River at Route 614 Wil Bullpasture River at Route 614 Jerry Branch at Route 42 near Clifton Jerry Branch at Route 42 near Clifton Jerry Branch at Route 42 near Clifton Cowpasture River below Route 633 near Cowpasture River below Route 633 near Cowpasture River below Route 633 near James River below Route 220 at Lick James River below Route 220 at Lick James River below Route 220 at Lick at New Meadow Creek above Route 311 at New Meadow Creek above Route 311 at New Meadow Creek above Route 311 Craig Creek at Route 616 New Castle, Craig Creek at Route 616 New Castle, (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02015600 02015600 02015600 02015700 02015700 02015700 02015900 02015900 02015900 02016000 02016000 02016000 02016500 02016500 02016500 02017000 02017000 02017000 02017300 02017300 Table 2. Table [mi 58 Peak-Flow Characteristics of Virginia Streams ------500 0.002 1,820 2,403 11,480 10,590 51,370 21,840 -- -- 200 0.005 1,242 1,452 9,417 1,871 1,782 1,820 9,745 1,476 7,412 1,294 11,333 19,133 41,030 38,095 40,025 16,340 12,543 26,281 -- -- 100 0.01 915 983 1,159 8,526 1,518 1,428 1,462 8,076 9,913 1,178 5,247 16,071 10,328 34,250 32,440 33,549 12,900 20,898 -- -- 50 0.02 662 922 938 744 7,631 9,301 1,206 1,141 1,162 6,654 7,781 3,654 13,405 28,260 27,401 27,884 10,000 16,534 /s) 3 -- -- 25 0.04 468 702 931 873 889 715 552 6,727 8,195 7,568 5,329 5,983 2,489 10,930 22,970 22,753 22,863 12,928 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 281 464 620 581 590 472 358 5,503 7,963 6,576 4,959 3,784 4,066 1,428 9,063 16,870 17,019 16,955 -- -- 5 0.2 179 313 421 395 400 319 884 240 4,529 5,951 5,227 3,368 2,753 2,886 6,679 12,810 13,072 12,969 -- -- 95.4 2.33 0.4292 174 232 222 224 177 461 130 3,336 3,858 3,596 8,670 8,830 8,766 1,913 1,714 1,760 4,383 -- -- 2 0.5 81.4 149 197 191 192 152 393 110 110 3,064 3,424 3,240 7,845 7,909 7,882 1,648 1,508 1,542 3,934
) 1.5 1.5 1.5 2 1.46 1.46 1.46 2.05 2.05 2.05 5.63 34.3 34.3 34.3 112 105 105 105 329 329 329 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. New Castle, Va. New Castle, Va. New Castle, Va. Va. Va. Va. New Castle, Va. New Castle, Va. New Castle, Va. at Parr, Va. at Parr, Va. at Parr, Va. tawba, Va. tawba, Va. tawba, Va. Fincastle, Va. Fincastle, Va. Fincastle, Va. Va. Craig Creek at Route 616 New Castle, near Johns Creek tributary at Route 311 near Johns Creek tributary at Route 311 near Johns Creek tributary at Route 311 Johns Creek at Route 615 New Castle, Johns Creek at Route 615 New Castle, Johns Creek at Route 615 New Castle, Craig Creek tributary at Route 606 near Craig Creek tributary at Route 606 near Craig Creek tributary at Route 606 near Craig Creek at abandoned railroad bridge Craig Creek at abandoned railroad bridge Craig Creek at abandoned railroad bridge Catawba Creek at Route 600 near Ca Catawba Creek at Route 600 near Ca Catawba Creek at Route 600 near Ca Campbell Branch at Route 606 near Campbell Branch at Route 606 near Campbell Branch at Route 606 near North Fork at Route 606 near Fincastle, (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02017300 02017400 02017400 02017400 02017500 02017500 02017500 02017700 02017700 02017700 02018000 02018000 02018000 02018500 02018500 02018500 02018700 02018700 02018700 02018800 Table 2. Table [mi Table 2 59 ------500 0.002 2,856 29,100 21,060 13,300 82,500 43,610 127,600 200 0.005 3,278 4,688 8,862 2,257 1,798 2,066 9,037 5,302 6,657 22,250 19,023 20,806 16,030 12,454 59,500 22,855 37,608 35,640 112,600 115,587 113,297 100 0.01 2,658 3,463 7,330 9,847 1,866 1,441 1,666 6,631 4,341 5,094 17,920 15,976 16,961 12,880 45,840 19,265 28,944 30,220 101,500 100,626 101,259 50 0.02 2,147 2,569 6,029 7,712 1,522 1,151 1,326 4,774 3,537 3,902 14,220 13,325 13,735 10,200 90,540 86,734 89,302 34,780 16,122 22,180 25,290 /s) 3 25 0.04 881 1,670 1,873 7,924 4,816 5,907 1,220 1,020 3,351 2,788 2,934 11,070 16,811 10,863 10,947 79,680 74,175 77,573 25,870 13,207 20,790 Peak flow (ft Return period (years) Exceedance probability 10 0.1 875 587 681 1,138 1,199 7,609 7,913 7,809 5,446 3,408 3,994 1,985 1,934 1,945 9,688 11,363 65,280 57,881 61,854 16,730 15,410 5 0.2 793 810 648 399 469 5,430 5,912 5,763 3,896 2,470 2,834 1,246 1,373 1,348 7,291 8,181 11,390 11,700 54,050 46,466 50,187 2.33 0.4292 463 462 420 225 278 647 825 786 3,351 3,831 3,677 2,422 1,529 1,762 6,658 4,777 5,215 7,798 40,530 33,538 36,988 2 0.5 401 399 376 193 245 548 720 680 2,958 3,400 3,253 2,145 1,343 1,560 5,813 4,250 4,632 7,004 37,480 30,484 34,019
) 2 5.63 5.63 2.08 2.08 2.08 29.3 29.3 29.3 12.5 12.5 12.5 104 104 104 141 141 141 186 (mi area 2,073 2,073 2,073 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. n e a r B u c h a n a n , Va . n e a r B u c h a n a n , Va . n e a r B u c h a n a n , Va . Va. Va. Va. B u c h a n a n , Va . B u c h a n a n , Va . B u c h a n a n , Va . We s t A u g u s t a , Va . We s t A u g u s t a , Va . We s t A u g u s t a , Va . C r e e k , a t G o s h e n , VaC . r e e k , a t G o s h e n , VaC . r e e k , a t G o s h e n , VaGoshen, . Va. North Fork at Route 606 near Fincastle, North Fork at Route 606 near Fincastle, C a t a w b a C a C t r a e w e b k a C n a C e t r a a e r w e b k Mill (Looney Mill) Creek at Route 636 F a i n n C e c r a a e r s e t k F l i e n n , e c a a Va r s Mill (Looney Mill) Creek at Route 636 . t F l i e n , c a Va s . t l e , Va Mill (Looney Mill) Creek at Route 636 . at Buchanan, James River at Route 11 at Buchanan, James River at Route 11 at Buchanan, James River at Route 11 Renick Run at Frontage Road near Renick Run at Frontage Road near Renick Run at Frontage Road near Calfpasture River near Route 250 Calfpasture River near Route 250 Calfpasture River near Route 250 Calfpasture River at Route 42 above Mill Calfpasture River at Route 42 above Mill Calfpasture River at Route 42 above Mill Calfpasture River below Mill Creek at (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02018800 02018800 02019000 02019000 02019000 02019400 02019400 02019400 02019500 02019500 02019500 02020100 02020100 02020100 02020200 02020200 02020200 02020500 02020500 02020500 02021000 Table 2. Table [mi 60 Peak-Flow Characteristics of Virginia Streams ------500 0.002 7,792 11,480 85,990 36,380 51,170 -- -- 200 0.005 1,099 7,139 5,173 6,007 9,881 5,881 9,792 7,260 27,009 32,231 65,720 38,095 53,367 27,710 15,426 42,050 47,900 43,643 -- -- 100 0.01 872 4,925 4,233 4,507 8,192 4,689 7,849 5,923 11,981 22,843 26,937 53,040 32,440 42,912 22,120 35,900 40,975 37,495 -- -- 50 0.02 691 3,353 3,448 3,413 6,751 9,220 3,682 5,866 4,645 19,174 22,232 42,280 27,401 34,244 17,270 30,320 34,755 31,932 /s) 3 -- -- 25 0.04 522 2,244 2,715 2,560 5,409 6,939 2,835 4,436 3,624 15,777 17,989 33,160 22,753 27,006 13,100 25,240 29,036 26,832 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 341 1,269 1,882 1,707 8,529 3,843 4,594 1,918 2,914 2,486 11,647 13,029 23,200 17,019 19,150 19,190 21,909 20,539 -- -- 5 0.2 228 787 8,825 9,769 1,335 1,190 5,687 2,797 3,214 1,351 1,953 1,733 16,930 13,072 14,279 15,000 16,982 16,070 -- -- 2.33 0.4292 124 422 801 694 819 5,840 6,494 8,830 9,509 3,073 1,743 1,953 1,104 1,018 11,629 11,128 10,920 10,550 -- -- 2 0.5 106 364 698 600 720 948 882 5,207 5,828 9,777 7,909 8,538 2,602 1,534 1,714 9,633 10,447 10,059
) 2 0.92 0.92 0.92 12 12 12 35.1 35.1 35.1 15.8 15.8 15.8 186 186 329 329 329 481 481 481 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Goshen, Va. Goshen, Va. Goshen, Va. Goshen, Va. Goshen, Va. b r i d g e B a t h s , Va . b r i d g e B a t h s , Va . b r i d g e B a t h s , Va . R o c k b r i d g e B a t h s , R Va o . c k b r i d g e B a t h s , R Va o . c k b r i d g e B a t h s , ton, Va . Va. ton, Va. ton, Va. n e a r L e x i n g t o n , Va . n e a r L e x i n g t o n , Va . n e a r L e x i n g t o n , Va . n e a r S t e e l e s Ta v e rn n e , a r Va . S t e e l e s Ta v e rn n e , a r Va . S t e e l e s Ta v e r n , Va . Calfpasture River below Mill Creek at Calfpasture River below Mill Creek at Brattons Run tributary at Route 780 near Brattons Run tributary at Route 780 near Brattons Run tributary at Route 780 near Maury River above Route 39 at Rock Maury River above Route 39 at Rock Maury River above Route 39 at Rock Cedar Grove Branch at Route 39 near Cedar Grove Branch at Route 39 near Cedar Grove Branch at Route 39 near Kerrs Creek at Interstate 64 near Lexing Kerrs Creek at Interstate 64 near Lexing Kerrs Creek at Interstate 64 near Lexing Maury (North) River above Route 631 Maury (North) River above Route 631 Maury (North) River above Route 631 South (Saint Marys) River at Route 608 South (Saint Marys) River at Route 608 South (Saint Marys) River at Route 608 (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02021000 02021000 02021100 02021100 02021100 02021500 02021500 02021500 02021700 02021700 02021700 02022500 02022500 02022500 02023000 02023000 02023000 02023300 02023300 02023300 Table 2. Table [mi Table 2 61 ------500 0.002 20,170 119,700 101,700 ------200 0.005 89,110 16,010 30,879 21,306 57,276 75,718 21,048 83,450 66,897 78,236 13,437 146,469 146,641 ------100 0.01 13,240 25,072 17,941 70,560 49,171 60,693 17,713 71,120 57,607 66,264 10,808 128,112 128,266 ------50 0.02 8,179 10,760 19,603 14,707 55,250 41,843 48,460 14,801 59,950 49,162 55,522 110,904 111,040 /s) 3 ------25 0.04 8,550 6,228 11,873 15,204 42,640 35,124 38,469 12,098 49,810 41,437 45,901 95,443 95,562 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 5,994 8,505 8,847 4,132 10,348 29,300 26,684 27,686 37,730 31,667 34,443 75,153 75,251 ------5 0.2 4,301 7,226 6,168 6,637 2,800 21,200 20,831 20,961 29,380 24,875 26,754 60,903 60,985 ------2.33 0.4292 1,611 2,612 4,350 3,819 4,327 18,711 13,670 14,418 14,143 20,520 17,377 44,584 44,647 ------2 0.5 2,285 3,801 3,352 3,845 1,390 12,270 12,984 12,712 18,700 15,680 17,000 40,651 40,709
) 2 27.1 27.1 27.1 112 112 112 647 647 647 123 123 123 837 837 837 (mi area 3,070 3,070 3,070 3,076 3,076 3,076 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. Va. Glasgow, Va. Glasgow, Va. Glasgow, Va. Glasgow, Va. Glasgow, Va. Glasgow, Va. Va. Va. Va. Big Island, Va. Big Island, Va. Big Island, Va. B u e n a Vi s t a , Va . B u e n a Vi s t a , Va . B u e n a Vi s t a , Va . South River at Route 631 near Riverside, South River at Route 631 near Riverside, South River at Route 631 near Riverside, M a u r y R M i a v u e r r y n R e M i a a v r u e r r B y u Creek at Route 608 near n Buffalo e R e n i a a v r e V r B i u s n e t e n a a a , r V Va B i Creek at Route 608 near Buffalo u . s e t n a a , V Va i . s t a , Va Creek at Route 608 near Buffalo . Maury (North) River at Route 130 near Maury (North) River at Route 130 near Maury (North) River at Route 130 near James River at Bedford Dam near Major, James River at Bedford Dam near Major, James River at Bedford Dam near Major, James River at Blue Ridge Parkway near James River at Blue Ridge Parkway near James River at Blue Ridge Parkway near Pedlar River at Forest Road 39 near Pedlar River at Forest Road 39 near Pedlar River at Forest Road 39 near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02023500 02023500 02023500 02024000 02024000 02024000 02024300 02024300 02024300 02024500 02024500 02024500 02024750 02024750 02024750 02024752 02024752 02024752 02024915 02024915 02024915 Table 2. Table [mi 62 Peak-Flow Characteristics of Virginia Streams ------500 0.002 632 42,700 17,130 64,520 88,740 178,400 198,400 -- -- 200 0.005 438 3,211 31,960 27,968 30,004 13,950 23,243 16,366 45,310 27,690 36,288 53,630 18,719 28,849 156,000 151,757 154,991 171,800 162,551 169,397 -- -- 100 0.01 328 2,542 11,810 15,113 25,250 22,683 23,895 18,812 13,895 34,220 22,455 27,816 36,050 20,879 139,700 132,831 137,784 152,600 142,474 149,539 -- -- 50 0.02 242 1,819 9,864 11,483 11,587 19,600 17,666 18,494 14,546 25,470 17,482 20,810 23,800 14,700 123,800 115,064 120,934 134,100 123,572 130,389 /s) 3 -- -- 25 0.04 175 1,341 8,100 9,345 8,888 11,211 99,116 14,850 13,672 14,123 18,590 13,526 15,429 15,350 10,402 108,200 104,712 116,200 106,639 112,293 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 852 109 9,750 9,277 9,428 6,008 7,564 6,762 9,175 9,988 8,149 5,957 6,405 11,740 87,840 78,151 83,364 93,210 84,304 88,882 -- -- 5 0.2 72.3 548 6,639 6,455 6,505 4,570 5,228 4,937 7,864 6,382 6,782 4,731 4,086 4,201 72,220 63,422 67,768 75,860 68,602 72,025 -- -- 41.2 2.33 0.4292 292 3,788 3,865 3,847 3,063 3,099 3,086 4,533 3,819 3,981 2,277 2,393 2,375 53,011 53,730 46,526 50,127 55,700 50,533 -- -- 2 0.5 35.8 246 3,270 3,372 3,349 2,757 2,696 2,718 3,950 3,332 3,468 1,903 2,075 2,048 46,119 49,620 42,442 51,280 46,140 48,671
) 2 2.36 2.36 2.36 0.45 94.6 94.6 94.6 69 69 69 93 93 93 47.7 47.7 47.7 (mi area 3,256 3,256 3,256 3,649 3,649 3,649 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Mills, Va. Mills, Va. Mills, Va. Lynchburg, Va. Lynchburg, Va. Lynchburg, Va. Creek, Va. Creek, Va. Creek, Va. Va. Va. Va. Va. Va. Va. Amherst, Va. Pedlar River at Route 635 near Pedlar River at Route 635 near Pedlar River at Route 635 near J a m e s R J i a v m e e r s a R J t i a v m H e e o r s l Burton Creek tributary at Route 29 c a R o t i m v b H e ( o r s l ) c a o t R m o b H c ( o k Burton Creek tributary at Route 29 s l , ) c o Va R m o b . c ( k s , ) Va R o . c Burton Creek tributary at Route 29 k , Va . James River above Route 60 at Bent James River above Route 60 at Bent James River above Route 60 at Bent Ty e R i v e Ty r e a t R i R v o e s Ty r e l e a a t n R d i R , v o River at Route 158 near Lovingston, Tye e s Va r e . l a a t n d R , o s Va e . l a n d River at Route 158 near Lovingston, Tye , Va . River at Route 158 near Lovingston, Tye Piney River at Route 151 River, Piney River at Route 151 River, Piney River at Route 151 River, River tributary at Route 60 near Buffalo (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02025000 02025000 02025000 02025500 02025500 02025500 02025800 02025800 02025800 02026000 02026000 02026000 02026500 02026500 02026500 02027000 02027000 02027000 02027500 02027500 02027500 02027700 Table 2. Table [mi Table 2 63 ------500 0.002 6,876 11,240 70,580 22,610 115,800 143,600 -- -- 200 0.005 768 1,215 4,882 4,279 4,569 7,984 5,308 6,945 6,617 79,960 36,361 51,838 60,737 77,899 49,280 28,003 37,355 10,187 15,120 101,300 -- -- 100 0.01 951 615 6,114 3,708 3,398 3,536 8,168 4,225 5,314 4,984 11,020 59,350 29,578 39,344 76,520 49,692 60,231 37,000 22,712 28,550 -- -- 50 0.02 655 455 6,115 2,767 2,458 2,581 4,637 3,083 3,902 7,923 3,539 43,180 23,275 29,196 56,760 39,897 45,962 27,320 17,689 21,270 /s) 3 -- -- 25 0.04 473 344 2,018 1,825 1,893 4,627 3,474 2,300 2,859 5,600 2,483 18,117 41,110 15,711 30,600 21,445 31,412 34,556 19,740 13,690 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 291 225 9,290 1,262 1,169 1,196 3,044 2,306 1,483 1,812 3,405 1,441 10,118 18,290 12,393 13,718 25,440 21,827 22,819 12,240 -- -- 5 0.2 181 831 760 778 972 886 149 8,704 9,251 8,031 6,464 6,839 2,043 1,635 1,193 2,229 11,530 16,570 15,615 15,842 -- -- 91.5 79.4 2.33 411 0.4292 459 421 532 667 457 5,961 5,287 5,400 9,022 9,753 9,603 4,464 3,870 3,991 1,157 1,045 1,268 -- -- 2 0.5 76.1 66.8 395 348 357 994 939 452 574 383 5,029 4,631 4,697 7,720 8,612 8,432 3,849 3,377 3,470 1,106
) 2 0.45 0.45 3.85 3.85 3.85 5.56 5.56 5.56 6.39 6.39 94.8 94.8 94.8 16.9 16.9 16.9 148 148 148 355 355 355 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Amherst, Va. Amherst, Va. River, Va. River, Va. River, Va. field,Va. field,Va. field,Va. Va. Va. Va. Va. Va. Va. Va. Va. Buffalo River tributary at Route 60 near Buffalo River tributary at Route 60 near Buffalo Tye River at Route 657 near Buffalo Tye River at Route 657 near Buffalo Tye River at Route 657 near Buffalo T y e ( B u T f y f e a l ( o B ) u T f y R f e i a v l ( e o B Rockfish River at Route 634 near Green r ) u f n R f e i a a v l r e o r ) N o n R r e i w a v Rockfish River at Route 634 near Green o r e o r d N , o n r e Va w a o r . o d N , o r Va w Rockfish River at Route 634 near Green o . o d , Va . Cove Creek at Route 29 near Covesville, Cove Creek at Route 29 near Covesville, Cove Creek at Route 29 near Covesville, C o v e C r C e o e v k e a C t r C e o R e v o k e u t a C Ballinger Creek at Route 6 Esmont, e t r e 6 R e 3 o k 2 u t a a e t t 6 R F 3 o a 2 u Ballinger Creek at Route 6 Esmont, b t e a e r t , 6 F 3 Va a 2 b . e a r t , F Va Ballinger Creek at Route 6 Esmont, a b . e r , Va . Miller Creek at Route 6 near Scottsville, Miller Creek at Route 6 near Scottsville, (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02027700 02027700 02027800 02027800 02027800 02028000 02028000 02028000 02028500 02028500 02028500 02028700 02028700 02028700 02028750 02028750 02028750 02028800 02028800 02028800 02028900 02028900 Table 2. Table [mi 64 Peak-Flow Characteristics of Virginia Streams ------500 0.002 33,600 16,820 24,480 345,100 ------200 0.005 920 8,003 5,859 7,902 2,423 2,631 11,701 11,490 17,470 10,628 19,320 29,566 279,300 186,449 246,790 ------100 0.01 718 8,305 6,400 7,520 8,456 4,669 5,935 1,912 2,078 10,490 15,930 23,994 235,700 163,867 207,454 ------50 0.02 489 5,689 6,191 4,746 5,123 6,104 3,420 4,216 1,353 1,475 12,930 18,728 196,800 142,482 172,770 /s) 3 ------25 0.04 992 351 3,810 3,574 3,572 3,573 4,294 2,557 3,013 1,083 10,280 14,512 161,900 123,406 142,846 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 624 684 214 2,097 1,644 2,333 2,177 2,546 1,653 1,847 7,253 9,863 98,071 121,200 108,161 ------5 0.2 860 398 437 132 1,411 1,254 1,552 1,597 1,088 1,180 5,261 6,877 93,630 80,242 85,623 ------65.6 2.33 0.4292 652 372 868 777 824 598 632 208 230 3,279 4,130 64,950 59,593 61,830 ------2 0.5 54.3 559 305 743 664 696 509 537 175 194 2,894 3,606 54,511 59,140 56,509
) 2 6.39 6.58 6.58 6.58 1.46 1.46 1.46 1.68 1.68 1.68 0.28 0.28 0.28 11.2 11.2 11.2 104 104 (mi area 4,581 4,581 4,581 Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. ville, Va. ville, Va. ville, Va. at Red Hill, Va. at Red Hill, Va. at Red Hill, Va. River at Route 29 near North Garden, Va. River at Route 29 near North Garden, Va. River at Route 29 near North Garden, Va. tesville, Va. tesville, Va. tesville, Va. Scottsville, Va. Scottsville, Va. Miller Creek at Route 6 near Scottsville, James River below Route 20 at Scotts James River below Route 20 at Scotts James River below Route 20 at Scotts North Fork Hardware River at Route 29 North Fork Hardware River at Route 29 North Fork Hardware River at Route 29 South Branch of North Fork Hardware South Branch of North Fork Hardware South Branch of North Fork Hardware Sowell Branch at Route 20 near Charlot Sowell Branch at Route 20 near Charlot Sowell Branch at Route 20 near Charlot H a r r i s H a C r r r e i e s k H a C a r r t r e i e R s k o T u h C a t o r t e m e a e R 2 s k o 0 T u h C a t n o r t e e m e a a e R 2 r s k o 0 T u h K C a t n o e r t e e m e e a a e n R 2 Hardware River at Route 618 near r s k e o 0 , u K C a t n e r V t e a e e e . a e n R 2 r k e o 0 , u K a t a e V t e t a e . n Hardware River at Route 618 near R 2 K e o 0 e , u e t a n V e t e a , . 2 K 0 e V a e . a n t e , K e V a e . n e , V a . (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02028900 02029000 02029000 02029000 02029200 02029200 02029200 02029400 02029400 02029400 02029410 02029410 02029410 02029430 02029430 02029430 02029450 02029450 02029450 02029500 02029500 Table 2. Table [mi Table 2 65 ------500 0.002 5,540 8,607 1,507 62,910 19,970 57,880 44,010 52,377 39,620 -- -- 200 0.005 3,703 5,163 1,223 3,475 1,689 3,243 11,410 22,926 42,810 31,521 36,787 40,440 24,716 32,927 32,040 28,089 30,172 -- -- 100 0.01 7,335 2,944 3,736 1,033 2,753 1,449 2,567 19,094 31,530 25,599 28,195 30,560 20,442 25,404 26,830 22,783 24,734 -- -- 50 0.02 861 2,211 4,623 2,620 1,976 1,188 1,837 15,488 22,850 20,031 21,167 22,880 18,101 20,344 22,040 17,747 19,596 /s) 3 -- -- 25 0.04 707 969 2,839 1,750 1,956 1,460 1,356 12,371 16,200 15,543 15,784 16,920 13,366 15,033 17,660 13,736 15,220 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 524 929 702 861 8,747 9,809 1,405 1,145 1,189 9,464 9,321 11,040 10,585 10,342 10,107 12,450 10,284 -- -- 5 0.2 768 778 776 400 600 504 555 6,288 6,327 7,397 7,107 7,723 6,872 7,220 8,905 6,487 7,104 -- -- 2.33 0.4292 341 450 426 270 321 301 295 3,870 3,460 4,458 4,225 4,861 4,397 4,604 5,303 3,885 4,184 -- -- 2 0.5 280 375 353 244 271 261 249 4,119 3,396 2,975 3,897 3,687 4,356 3,917 4,600 3,390 3,638
) 2.7 2.7 2.7 2.4 2.4 2.4 2 4.33 4.33 4.33 95.3 95.3 95.3 116 116 116 104 226 226 226 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Scottsville, Va. e r y C r e e k ( Re u r n y ) , C r n e e e a k r ( S Re c u r o n y t ) t , C s r v n e i e e l a k l r e ( , S R ham, c u Va o n . tVa. ) t , s v n i e l a l r e , S ham, c Va o . tVa. t s v i l l e , ham, Va .Va. nia, Va. nia, Va. nia, Va. Va. Va. Va. Va. Va. Va. Hall (Ivy), Va. Hall (Ivy), Va. Hall (Ivy), Va. Hardware River at Route 618 near Hardware River at Route 637 below Bri Hardware River at Route 637 below Bri Hardware River at Route 637 below Bri Frisby Branch at Route 24 near Bucking Frisby Branch at Route 24 near Bucking Frisby Branch at Route 24 near Bucking Arvo Slate River above Route 676 near Arvo Slate River above Route 676 near Arvo Slate River above Route 676 near Afton, Stockton Creek at Route 6 near Afton, Stockton Creek at Route 6 near Afton, Stockton Creek at Route 6 near Powells Creek at Route 684 near Crozet, Powells Creek at Route 684 near Crozet, Powells Creek at Route 684 near Crozet, White Mechums River at Route 614 near White Mechums River at Route 614 near White Mechums River at Route 614 near (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02029500 02030000 02030000 02030000 02030100 02030100 02030100 02030500 02030500 02030500 02030800 02030800 02030800 02030900 02030900 02030900 02031000 02031000 02031000 Table 2. Table [mi 66 Peak-Flow Characteristics of Virginia Streams ------500 0.002 6,588 94,440 22,510 ------200 0.005 5,001 8,003 6,043 5,952 3,846 10,501 66,630 24,788 38,240 17,990 15,480 17,010 ------100 0.01 4,006 6,400 4,929 8,424 4,744 3,050 50,200 20,077 28,924 14,980 12,472 13,890 ------50 0.02 3,161 4,746 3,854 6,313 3,477 2,198 9,491 37,020 15,562 21,186 12,300 10,927 /s) 3 ------25 0.04 2,447 3,572 2,999 4,781 2,600 1,628 9,905 7,249 8,457 26,540 12,012 15,378 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 1,670 2,333 2,047 3,148 1,683 8,120 9,642 1,039 7,129 4,830 5,690 16,050 ------5 0.2 674 2,115 1,185 1,552 1,418 1,108 5,626 6,363 5,273 3,291 3,904 10,150 ------2.33 0.4292 727 868 826 609 362 1,200 5,209 3,346 3,609 3,387 1,908 2,275 ------2 0.5 641 743 714 519 306 3,116 1,032 4,374 2,914 3,014 1,649 1,974
) 2 6.76 6.76 6.76 3.21 3.21 3.21 11.2 11.2 11.2 17.8 17.8 17.8 77 77 77 34.5 34.5 34.5 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Charlottesville Reservoir near White Charlottesville Reservoir near Hall,Va. White Charlottesville Reservoir near Hall,Va. White Charlottesville Reservoir near Hall,Va. R e s e r v o i r n e a rR e W s h e i r t v e o i H r a l n l e , a Va rR . e W s h e i r t v e o i H r a l n l e , a Va rHall, . W h iVa. t e H a l l , VaHall, . Va. Hall, Va. Union, Va. Union, Va. Union, Va. ville, Va. ville, Va. ville, Va. Free Union, Va. Free Union, Va. Free Union, Va. North Fork Moormans River above North Fork Moormans River above North Fork Moormans River above Moormans River below Charlottesville Moormans River below Charlottesville Moormans River below Charlottesville White Doyles River at Route 810 near White Doyles River at Route 810 near White Doyles River at Route 810 near Moormans River at Route 601 near Free Moormans River at Route 601 near Free Moormans River at Route 601 near Free Muddy Run at Route 810 near Stanards Muddy Run at Route 810 near Stanards Muddy Run at Route 810 near Stanards Buck Mountain Creek at Route 665 near Buck Mountain Creek at Route 665 near Buck Mountain Creek at Route 665 near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02031500 02031500 02031500 02032000 02032000 02032000 02032200 02032200 02032200 02032250 02032250 02032250 02032300 02032300 02032300 02032400 02032400 02032400 Table 2. Table [mi Table 2 67 ------500 0.002 429 6,515 2,964 93,940 95,500 118,900 -- -- 200 0.005 280 977 333 4,915 3,846 4,486 2,446 4,389 3,074 8,968 64,640 45,263 55,854 50,485 84,010 18,527 66,250 30,227 -- -- 100 0.01 200 763 248 3,925 3,050 3,538 2,084 3,486 2,601 7,181 48,210 36,909 42,747 41,218 62,940 13,457 49,710 24,537 -- -- 50 0.02 140 521 179 3,093 2,198 2,647 1,748 2,525 2,082 5,349 9,223 35,540 29,294 32,296 32,854 45,830 36,860 19,169 /s) 3 -- -- 25 96.4 0.04 374 130 2,397 1,628 1,971 1,436 1,875 1,652 4,036 6,340 25,800 22,914 24,185 25,761 32,120 26,900 14,860 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 56.0 82.3 229 1,647 1,039 1,262 1,055 1,202 1,141 2,645 3,691 16,320 15,779 15,984 17,799 18,430 17,130 10,107 -- -- 5 0.2 35.0 55.1 674 826 788 783 785 141 1,183 1,767 2,277 7,052 11,070 11,170 11,137 11,670 12,650 10,890 -- -- 18.5 70.5 30.8 2.33 0.4292 746 362 452 504 424 446 994 6,625 6,866 6,799 7,822 4,870 1,188 7,003 4,240 -- -- 2 0.5 15.8 58.4 26.3 664 306 386 446 359 382 852 5,853 6,035 5,986 6,887 3,914 1,005 6,188 3,704
) 2 3.21 3.21 3.21 4.02 4.02 4.02 0.31 0.31 0.31 13.6 13.6 13.6 215 215 215 259 259 259 108 108 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 n e a r E a r l y s v i l l e , Va .n e a r E a r l y s v i l l e , Va .n e a r E a r l y s v i l l e , Va .n e a r C h a r l o t t e s v i ln l e e a , r Va C h . a r l o t t e s v i ln l e e a , r Va C h . a r l o t t e s v i lnardsville, l e , Va . Va. nardsville, Va. nardsville, Va. S t a n a r d s v i l l e , Va . S t a n a r d s v i l l e , Va . S t a n a r d s v i l l e , Va . ville, Va. ville, Va. ville, Va. S t a n a r d s v i l l e , Va . S t a n a r d s v i l l e , Va . S t a n a r d s v i l l e , Va . n e a r E a r l y s v i l l e , Va .n e a r E a r l y s v i l l e , Va . South Fork Rivanna River at Route 660 South Fork Rivanna River at Route 660 South Fork Rivanna River at Route 660 South Fork Rivanna River at Route 29 South Fork Rivanna River at Route 29 South Fork Rivanna River at Route 29 Parker Branch at Route 810 near Sta Parker Branch at Route 810 near Sta Parker Branch at Route 810 near Sta Haneytown Creek at Route 810 near Haneytown Creek at Route 810 near Haneytown Creek at Route 810 near River at Route 810 Nortons Lynch River at Route 810 Nortons Lynch River at Route 810 Nortons Lynch Swift Run tributary at Route 33 near Swift Run tributary at Route 33 near Swift Run tributary at Route 33 near North Fork Rivanna River at Route 606 North Fork Rivanna River at Route 606 (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02032500 02032500 02032500 02032515 02032515 02032515 02032530 02032530 02032530 02032540 02032540 02032540 02032550 02032550 02032550 02032600 02032600 02032600 02032640 02032640 Table 2. Table [mi 68 Peak-Flow Characteristics of Virginia Streams ------500 0.002 2,389 6,425 34,030 27,320 148,200 ------200 0.005 2,207 2,354 2,246 3,914 3,957 3,937 2,695 48,244 39,981 28,500 74,507 87,606 14,330 114,700 102,837 ------100 0.01 1,808 1,857 1,823 2,656 3,140 2,921 2,129 8,616 36,324 32,557 24,790 61,098 28,655 93,240 71,971 83,085 ------50 0.02 1,467 1,312 1,412 1,776 2,265 2,061 1,513 5,061 26,767 25,715 21,430 49,450 25,047 74,610 58,621 66,288 /s) 3 ------25 0.04 962 1,111 1,175 1,086 1,166 1,678 1,482 2,883 39,110 19,534 20,059 18,380 21,681 58,490 46,530 51,691 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 852 605 726 640 929 702 1,072 1,280 12,409 13,761 14,750 27,347 17,461 40,510 32,698 35,531 ------5 0.2 645 385 492 387 696 607 449 637 8,338 9,698 12,220 19,708 14,270 29,010 23,701 25,344 ------2.33 0.4292 441 201 278 199 374 332 237 249 4,879 5,921 9,509 12,448 10,537 17,860 15,103 15,826 ------2 0.5 402 169 240 170 317 283 199 198 4,258 5,195 8,946 9,708 11,026 13,411 15,730 14,002
) 2 1.39 1.39 1.39 3.37 3.37 3.37 1.75 1.75 1.75 1.59 108 174 174 174 503 503 503 663 663 663 (mi area Drainage - - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 n e a r E a r l y s v i l l e , Va .near Proffit, Va. near Proffit, Va. near Proffit, Va. C h a r l o t t e s v i l l e , Va .C h a r l o t t e s v i l l e , Va .C h a r l o t t e s v i l l e , Va .lottesville, Va. lottesville, Va. lottesville, Va. C h a r l o t t e s v i l l e , Va . C h a r l o t t e s v i l l e , Va . C h a r l o t t e s v i l l e , Va . Shadwell, Va. Shadwell, Va. Shadwell, Va. Va. Va. Va. myra, Va. North Fork Rivanna River at Route 606 North Fork Rivanna River at Route 649 North Fork Rivanna River at Route 649 North Fork Rivanna River at Route 649 Schenks Branch above Route 250 at Schenks Branch above Route 250 at Schenks Branch above Route 250 at Moores Creek along Route 29 near Char Moores Creek along Route 29 near Char Moores Creek along Route 29 near Char Rivanna River below Moores Creek near Rivanna River below Moores Creek near Rivanna River below Moores Creek near Henderson Creek at Route 729 near Henderson Creek at Route 729 near Henderson Creek at Route 729 near Rivanna River at Route 15 Palmyra, Rivanna River at Route 15 Palmyra, Rivanna River at Route 15 Palmyra, Hunters Branch at Route 15 near Pal (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02032640 02032680 02032680 02032680 02032700 02032700 02032700 02033300 02033300 02033300 02033500 02033500 02033500 02033700 02033700 02033700 02034000 02034000 02034000 02034050 Table 2. Table [mi Table 2 69 -- -- 500 0.002 740 839 3,277 5,954 1,276 1,527 7,045 1,843 1,861 1,289 1,848 17,924 33,580 47,554 39,002 371,200 250,677 335,652 -- -- 200 0.005 833 688 784 851 2,289 3,548 1,137 4,615 1,126 1,363 1,202 10,854 24,700 26,533 25,573 302,400 121,644 229,921 -- -- 100 0.01 589 882 649 746 766 608 867 1,802 2,500 8,825 3,685 1,061 19,330 21,977 20,685 256,700 104,004 189,134 -- -- 50 0.02 406 598 609 703 515 731 421 597 1,298 1,665 7,276 2,821 14,920 19,580 17,418 215,800 105,740 164,955 /s) 3 -- -- 25 0.04 270 494 568 646 340 600 286 432 1,046 1,259 5,538 2,216 11,310 14,421 12,989 179,100 73,647 128,155 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 671 736 146 308 512 582 189 377 160 266 3,789 1,463 7,519 9,160 10,242 136,100 55,728 91,323 -- -- 5 0.2 83.3 92.8 115 448 471 200 466 512 247 168 2,672 1,001 5,250 7,456 6,575 106,700 42,816 70,748 -- -- 36.8 41.4 61.0 88.3 2.33 0.4292 253 252 109 406 587 423 136 1,638 3,185 4,788 4,083 75,950 29,777 51,448 -- -- 2 0.5 29.7 87.3 33.2 52.4 72.8 207 206 392 493 401 109 1,417 2,807 4,276 3,606 69,680 28,057 48,365
) 2 1.59 1.59 0.37 0.37 0.37 6.85 6.85 6.85 0.54 0.54 0.54 40.7 40.7 40.7 262 262 262 (mi area 6,252 6,252 6,252 Drainage - - - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 myra, Va. myra, Va. Va. Va. Va. S p r o u s e s C o r n e r, VaS . p r o u s e s C o r n e r, VaS . p r o u s e s C o r n e r, Vaville, . Va. ville, Va. ville, Va. Vi l l a g e ( F l a n a g aVi n l l M a i g l e l s ( ) F , l a Va n . a g aVi n l l M a i g l e l s ( ) F , l a Va n . a g aVa. n M i l l s ) , Va . Va. Va. 2 5 0 n e a r F e r n c l i ff ,2 5Va 0 . n e a r F e r n c l i ff ,2 5Va 0 . n e a r F e r n c l i ff , Va . Hunters Branch at Route 15 near Pal Hunters Branch at Route 15 near Pal River at Route 15 Curdsville, Willis River at Route 15 Curdsville, Willis River at Route 15 Curdsville, Willis Whispering Creek at Route 60 Whispering Creek at Route 60 Whispering Creek at Route 60 River at Route 15 Curds Willis Little River at Route 15 Curds Willis Little River at Route 15 Curds Willis Little River at Route 690 Lakeside Willis River at Route 690 Lakeside Willis River at Route 690 Lakeside Willis James River at Route 45 Cartersville, James River at Route 45 Cartersville, James River at Route 45 Cartersville, Big Lickinghole Creek tributary at Route Big Lickinghole Creek tributary at Route Big Lickinghole Creek tributary at Route (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02034050 02034050 02034200 02034200 02034200 02034250 02034250 02034250 02034300 02034300 02034300 02034500 02034500 02034500 02035000 02035000 02035000 02035400 02035400 02035400 Table 2. Table [mi 70 Peak-Flow Characteristics of Virginia Streams ------500 35.2 0.002 1,136 1,391 1,206 11,875 23,527 17,715 10,360 13,108 ------200 23.7 60.1 0.005 803 142 229 445 879 1,044 7,337 8,149 7,841 13,926 10,739 ------100 94.9 17.3 47.6 0.01 606 809 155 309 677 8,729 5,544 6,586 6,224 11,381 ------50 56.5 12.5 94.4 35.7 0.02 448 544 194 486 9,589 7,190 4,098 5,297 4,914 /s) 3 ------8.80 25 32.9 56.4 25.9 0.04 119 323 451 372 7,231 5,474 2,945 4,074 3,705 Peak flow (ft Return period (years) Exceedance probability ------5.40 10 0.1 14.4 25.6 15.2 56.9 197 280 234 4,999 3,744 1,784 2,754 2,486 ------6.81 3.50 8.73 5 0.2 12.5 29.1 126 182 151 3,557 2,640 1,128 1,923 1,698 ------2.48 2.00 4.74 3.80 11.7 65.8 98.6 79.3 2.33 0.4292 577 968 2,209 1,617 1,161 ------1.87 1.70 3.61 2.96 9.11 2 0.5 55.6 78.6 64.9 484 995 818 1,928 1,399
) 2 0.31 0.31 0.31 0.01 0.01 0.01 68.4 68.4 68.4 39.8 39.8 39.8 22.4 22.4 22.4 0.004 0.004 0.004 0.036 0.036 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 n e a r G u m S p r i n g s , n Va e . a r G u m S p r i n g s , n Va e . a r G u m S p r i n g s , Goochland, Va . Va. Goochland, Va. Goochland, Va. Farm, Va. Farm, Va. Farm, Va. Mills, Va. Mills, Va. Mills, Va. n e a r C e n t e r v i l l e , Va .n e a r C e n t e r v i l l e , Va .n e a r C e n t e r v i l l e , Va .n e a r C e n t e r v i l l e , Va .n e a r C e n t e r v i l l e , Va .n e a r C e n t e r v i l l e , Va .a t R o u t e 2 8 8 a n t e a R r o u C t e e n t 2 e 8 r 8 v i n l e l a e r , C Va e . n t e r v i l l e , Va . Rocketts Creek tributary at Route 250 Rocketts Creek tributary at Route 250 Rocketts Creek tributary at Route 250 Big Lickinghole Creek at Route 600 near Big Lickinghole Creek at Route 600 near Big Lickinghole Creek at Route 600 near Beaverdam Creek at Route 6 State Beaverdam Creek at Route 6 State Beaverdam Creek at Route 6 State at Fine Creek Fine Creek at Route 711 at Fine Creek Fine Creek at Route 711 at Fine Creek Fine Creek at Route 711 Creek tributary 1 at Route 288 Tuckahoe Creek tributary 1 at Route 288 Tuckahoe Creek tributary 1 at Route 288 Tuckahoe Creek tributary 2 at Route 288 Tuckahoe Creek tributary 2 at Route 288 Tuckahoe Creek tributary 2 at Route 288 Tuckahoe Creek tributary to 3 Tuckahoe Creek tributary to 3 Tuckahoe (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02035450 02035450 02035450 02035500 02035500 02035500 02036000 02036000 02036000 02036500 02036500 02036500 0203667510 0203667510 0203667510 0203667525 0203667525 0203667525 0203667530 0203667530 Table 2. Table [mi Table 2 71 -- 500 63.9 14.6 30.0 0.002 111 176 115 115 11,756 13,910 12,733 28,220 16,084 20,386 24,030 20,645 22,323 395,400 261,009 349,950 -- 200 40.3 95.4 12.9 46.7 21.3 0.005 157 8,839 7,376 7,958 9,829 17,780 12,230 15,940 12,355 13,889 327,400 126,229 236,333 -- 100 11.6 27.9 73.1 34.1 18.2 0.01 117 6,194 5,949 6,040 7,975 9,210 11,550 12,340 10,072 10,664 280,900 108,007 195,075 -- 50 18.9 66.8 46.2 10.4 24.6 15.2 0.02 4,278 4,743 4,580 8,404 6,519 7,024 8,246 8,398 8,340 238,000 110,164 171,973 /s) 3 -- 9.30 25 12.4 59.4 37.6 16.6 12.2 0.04 2,900 3,662 3,383 5,591 4,980 5,152 5,782 6,361 6,136 198,600 76,623 132,894 Peak flow (ft Return period (years) Exceedance probability -- 6.70 7.80 9.61 8.63 10 0.1 34.1 23.2 1,663 2,465 2,210 3,093 3,393 3,319 3,472 4,376 4,071 150,800 58,070 94,136 -- 3.90 6.60 5.77 6.19 5 0.2 20.7 14.0 1,037 1,715 1,493 1,852 2,385 2,247 2,245 3,100 2,806 117,300 44,674 72,602 ------1.90 6.58 5.30 10.2 2.33 0.4292 555 854 921 1,030 1,454 1,291 1,253 1,913 1,657 81,140 31,130 52,101 ------1.50 7.58 4.88 5.00 2 0.5 478 879 725 775 1,254 1,100 1,088 1,663 1,432 73,650 29,369 48,812
) 2 18.2 18.2 18.2 33.1 33.1 33.1 53.3 53.3 53.3 0.036 0.006 0.006 0.006 0.016 0.016 0.016 (mi area 6,753 6,753 6,753 Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 a t R o u t e 2 8 8 Pump, n e a Va. r C e n t e r v iPump, l l e Va. , Va . Pump, Va. R i c h m o n d , Va . R i c h m o n d , Va . R i c h m o n d , Va . thian, Va. thian, Va. thian, Va. field,Va. field,Va. field,Va. D r e w r y s B l u ff , Va . D r e w r y s B l u ff , Va . D r e w r y s B l u ff , Va . Chesterfield, Va. Chesterfield, Va. Chesterfield, Va. Tuckahoe Creek tributary to 3 Tuckahoe Stony Run tributary to at Short Stony Run tributary to at Short Stony Run tributary to at Short James River above Route 147 near James River above Route 147 near James River above Route 147 near Falling Creek at Route 653 near Midlo Falling Creek at Route 653 near Midlo Falling Creek at Route 653 near Midlo Falling Creek at Route 651 near Chester Falling Creek at Route 651 near Chester Falling Creek at Route 651 near Chester Falling Creek at Hopkins Road near Falling Creek at Hopkins Road near Falling Creek at Hopkins Road near Reedy Creek Industrial Drainage near Reedy Creek Industrial Drainage near Reedy Creek Industrial Drainage near (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 0203667530 0203668010 0203668010 0203668010 02037500 02037500 02037500 02037800 02037800 02037800 02038000 02038000 02038000 02038500 02038500 02038500 0203856510 0203856510 0203856510 Table 2. Table [mi 72 Peak-Flow Characteristics of Virginia Streams ------500 0.002 9,101 6,381 7,703 9,699 3,363 4,248 6,179 3,008 7,908 2,255 3,526 11,989 10,208 25,080 13,351 ------200 0.005 2,116 6,131 4,214 5,035 6,481 6,518 2,344 2,831 3,598 5,130 7,209 8,288 1,663 4,907 2,122 2,334 15,310 ------100 0.01 4,491 3,359 3,809 5,213 4,672 1,846 2,142 2,338 1,663 4,106 5,297 6,700 1,307 3,662 1,715 1,756 10,340 ------50 0.02 4,110 3,245 2,552 2,804 3,229 1,332 1,507 1,484 1,190 6,832 3,172 3,824 5,397 1,016 2,565 1,355 1,227 /s) 3 ------25 0.04 912 962 778 955 2,011 2,303 2,120 3,188 2,127 1,073 1,180 4,389 2,482 2,851 4,148 1,774 1,054 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 689 724 446 615 529 709 594 1,405 1,323 1,349 2,135 1,099 2,296 1,646 1,756 2,807 1,007 ------5 0.2 920 902 908 583 460 472 238 409 380 607 484 386 1,478 1,302 1,130 1,161 1,961 ------99.8 2.33 0.4292 522 526 525 882 217 260 255 230 594 666 650 242 304 274 208 1,185 ------2 0.5 80.2 454 440 445 750 166 213 207 188 488 562 544 217 253 236 169 1,016
) 3.6 3.6 3.6 2 5.67 5.67 5.67 1.67 1.67 1.67 1.35 1.35 1.35 8.54 8.54 8.54 13.9 13.9 13.9 23.2 23.2 23.2 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 pomattox) at Route 24 near Appomat pomattox) at Route 24 near tox,Va. Appomat pomattox) at Route 24 near tox,Va. Appomat pomattox) at Route 24 near tox,Va. Hixburg, Va. Hixburg, Va. Hixburg, Va. A n d e r s o n v i l l e , Va . A n d e r s o n v i l l e , Va . A n d e r s o n v i l l e , Va . Hixburg, Va. Hixburg, Va. Hixburg, Va. Va. Va. Va. Appomattox River (North Branch Ap Appomattox River (North Branch Ap Appomattox River (North Branch Ap Appomattox River (North Branch Fishpond Creek at Route 617 near Fishpond Creek at Route 617 near Fishpond Creek at Route 617 near H o l i d a y H C o r l e i e d k a y n H e C o a r l r e i e d T k a o y g n N a e C , o a r r r e Va t e . h T k o g H n N a e o , o a l r r Va i t d . h T o a g y H N a o , o C l r r Va i t e d . h e a k Holiday Creek above Route 614 near y H o n C l e r i a e d r e a k y T o n g C e a r a , e r e Holiday Creek above Route 614 near Va k T o . n g e a a , r Va T o . g a , Holiday Creek above Route 614 near Va . Creek at Route 626 near Vaughans Creek at Route 626 near Vaughans Creek at Route 626 near Vaughans Dry Creek at Route 635 near Farmville, Dry Creek at Route 635 near Farmville, Dry Creek at Route 635 near Farmville, (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02038800 02038800 02038800 02038830 02038830 02038830 02038840 02038840 02038840 02038845 02038845 02038845 02038850 02038850 02038850 02038880 02038880 02038880 02038900 02038900 02038900 Table 2. Table [mi Table 2 73 -- 500 0.002 9,974 1,631 2,943 19,340 23,743 44,730 51,230 47,500 54,610 81,062 62,872 12,810 24,465 33,180 36,483 39,220 47,598 21,466 16,633 34,779 111,535 -- 200 0.005 5,381 1,208 1,834 11,983 14,610 14,043 14,288 34,910 28,406 31,504 41,150 43,248 41,995 10,240 14,434 26,340 20,814 23,134 31,270 57,932 35,836 -- 100 0.01 938 8,529 3,315 1,280 11,620 11,478 11,534 11,805 28,520 23,562 25,722 32,880 36,188 34,332 10,036 21,740 17,153 18,890 26,200 48,772 30,639 -- 50 0.02 640 819 9,065 9,678 9,455 6,993 9,977 8,480 2,002 21,117 22,920 21,853 25,980 33,637 29,506 17,620 14,964 15,889 21,830 46,497 27,076 /s) 3 -- 25 0.04 528 628 6,901 7,296 7,153 5,618 7,514 6,578 1,178 11,120 18,030 15,514 16,520 20,220 24,334 22,152 13,920 12,076 18,040 33,278 21,478 Peak flow (ft Return period (years) Exceedance probability -- 10 0.1 552 329 360 4,553 5,046 4,897 4,017 5,203 4,707 9,638 7,818 8,329 11,049 11,539 12,510 14,050 17,637 15,976 13,790 24,415 16,818 -- 5 0.2 290 215 226 3,103 3,592 3,443 8,946 8,063 8,359 2,946 3,707 3,394 6,805 5,642 5,969 11,754 11,010 10,230 13,063 18,272 13,148 -- 2.33 117 119 0.4292 123 1,763 2,231 2,070 5,460 5,197 5,295 6,641 8,607 7,627 1,859 2,306 2,108 4,003 3,578 3,713 8,236 9,344 12,224 -- 2 0.5 94.1 95.3 100 1,518 1,948 1,793 4,793 4,652 4,707 5,965 7,820 6,864 1,645 2,016 1,846 3,466 3,168 3,267 7,689 8,634 11,221
) 2 0.42 0.42 0.42 69.6 69.6 69.6 73.7 73.7 73.7 302 302 302 725 725 725 158 158 158 (mi area 1,333 1,333 1,333 1,342 Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 d e n S y d n e y, Va . d e n S y d n e y, Va . d e n S y d n e y, Va . ville, Va. ville, Va. ville, Va. Mattoax, Va. Mattoax, Va. Mattoax, Va. Amelia, Va. Amelia, Va. Amelia, Va. nboro, Va. nboro, Va. nboro, Va. Matoaca, Va. Buffalo Creek at Route 658 near Hamp Buffalo Creek at Route 658 near Hamp Buffalo Creek at Route 658 near Hamp Buffalo Appomattox River at Route 45 Farm Appomattox River at Route 45 Farm Appomattox River at Route 45 Farm Appomattox River at railroad bridge Appomattox River at railroad bridge Appomattox River at railroad bridge F l a t C F r l e a e t k C a F r t l e a e R t k o u Nibbs Creek tributary at Route 609 near C a t r t e e e R 6 k o 8 u 1 a t t e n e R 6 a o 8 r Nibbs Creek tributary at Route 609 near u 1 t A e m n e e 6 l a 8 i r 1 a A , m n e e V a l a Nibbs Creek tributary at Route 609 near . i r a A , m e V a l . i a , V a Deep Creek above Route 153 near Man . Deep Creek above Route 153 near Man Deep Creek above Route 153 near Man A p p o m a t A t p o p x o m R a i t A v t p e o p r x o m n R aAppomattox River at Route 600 e i t a v t r e o r x P e n R t e i e a v r r e s r b P u e n r t e g e a , r r s Va b P u e . r t g e , r s Va b u . r g , Va . (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02039000 02039000 02039000 02039500 02039500 02039500 02040000 02040000 02040000 02040500 02040500 02040500 02040600 02040600 02040600 02041000 02041000 02041000 02041500 02041500 02041500 02041650 Table 2. Table [mi 74 Peak-Flow Characteristics of Virginia Streams -- 500 37.7 61.9 0.002 670 281 772 186 605 3,522 1,066 1,542 3,061 1,244 88,090 34,243 21,550 10,304 17,143 111,929 73,946 -- 200 29.3 80.0 41.4 0.005 501 123 496 354 415 706 1,788 1,014 5,319 1,505 58,119 52,360 19,640 15,540 10,746 42,157 -- 100 91.6 24.0 59.1 33.5 0.01 398 378 726 268 320 906 502 1,054 4,225 8,149 11,980 48,933 34,870 16,166 28,731 -- 50 67.2 19.5 43.0 26.6 0.02 611 312 285 509 201 244 540 353 9,112 3,331 6,129 46,664 22,880 14,032 19,906 /s) 3 -- 25 46.7 15.7 29.5 20.4 0.04 241 346 205 348 144 181 316 241 6,803 2,555 4,532 33,394 14,730 10,450 13,358 Peak flow (ft Return period (years) Exceedance probability -- 10 0.1 11.4 27.7 88.0 17.3 13.7 164 155 127 199 118 118 149 140 7,878 7,329 4,438 1,698 2,929 7,683 24,503 -- 8.70 9.47 5 0.2 17.2 82.7 79.3 82.3 79.8 56.3 86.8 10.6 118 121 4,656 5,279 3,054 1,184 2,024 4,865 18,340 ------6.10 73.9 33.4 60.9 2.33 0.4292 2,343 3,337 1,825 2,623 12,272 ------5.60 2 0.5 65.8 27.2 51.1 1,989 2,949 1,605 2,244 11,266
) 2 0.99 0.99 0.99 0.55 0.55 0.55 62.2 62.2 62.2 0.087 0.087 0.087 0.041 0.041 0.041 140 140 140 (mi area 1,342 1,342 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Matoaca, Va. Matoaca, Va. Chester, Va. Chester, Va. Chester, Va. near Walthall, Va. near Walthall, Va. near Walthall, Va. Charles City, Va. Charles City, Va. Charles City, Va. S p r i n g G r o v e , Va . S p r i n g G r o v e , Va . S p r i n g G r o v e , Va . Atlee, Va. Atlee, Va. Atlee, Va. t a r y a t E l l e r s o n , Va .t a r y a t E l l e r s o n , Va .t a r y a t E l l e r s o n , Va . Appomattox River at Route 600 Appomattox River at Route 600 Swift Creek at Bradley Bridge Road near Swift Creek at Bradley Bridge Road near Swift Creek at Bradley Bridge Road near Swift Creek tributary Industrial Drainage Swift Creek tributary Industrial Drainage Swift Creek tributary Industrial Drainage Glebe Creek tributary at Route 155 near Glebe Creek tributary at Route 155 near Glebe Creek tributary at Route 155 near Bailey Branch tributary at Route 10 Bailey Branch tributary at Route 10 Bailey Branch tributary at Route 10 Chickahominy River at Route 301 near Chickahominy River at Route 301 near Chickahominy River at Route 301 near Chickahominy River tributary to tribu Chickahominy River tributary to tribu Chickahominy River tributary to tribu (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02041650 02041650 02042000 02042000 02042000 0204206210 0204206210 0204206210 02042200 02042200 02042200 02042250 02042250 02042250 02042287 02042287 02042287 0204228775 0204228775 0204228775 Table 2. Table [mi Table 2 75 ------500 79.3 76.0 78.3 0.002 103 574 2,650 4,128 3,604 7,797 2,104 1,895 2,039 3,666 22,170 22,132 22,159 ------200 60.5 31.4 48.7 86.8 0.005 905 260 1,884 2,828 3,332 3,974 3,347 1,429 1,227 11,831 15,810 14,362 ------100 48.7 22.8 37.1 75.6 0.01 697 909 196 1,477 2,236 3,132 3,140 3,132 9,528 1,055 11,112 12,100 ------50 38.6 16.3 27.8 65.2 0.02 770 531 668 146 1,046 1,640 2,935 2,462 2,919 9,141 7,628 8,533 /s) 3 ------25 30.0 10.9 20.0 55.6 0.04 849 554 389 480 103 1,312 2,740 1,874 2,704 6,789 5,976 6,450 Peak flow (ft Return period (years) Exceedance probability ------6.23 10 0.1 20.7 12.5 43.8 62.7 540 849 347 245 300 4,411 2,480 1,235 2,417 4,066 4,263 ------3.69 8.26 5 0.2 14.8 35.4 39.7 358 571 853 234 162 200 2,275 2,194 3,038 2,907 2,982 ------9.20 26.2 2.33 0.4292 200 326 139 2,025 1,830 ------8.10 2 0.5 24.2 163 269 123 1,967 1,615
) 2 1.06 1.06 1.06 2.47 2.47 2.47 2.83 2.83 2.83 0.32 0.32 37.4 37.4 37.4 0.008 0.008 0.008 251 251 251 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 mond, Va. mond, Va. mond, Va. mond, Va. mond, Va. mond, Va. Richmond, Va. Richmond, Va. Richmond, Va. Va. Va. Va. P r o v i d e n c e F o r g e , P Va r . o v i d e n c e F o r g e , P Va r . o v i d e n c e F o r g e , d Va e . n c e F o rg e , Va . d e n c e F o rg e , Va . d e n c e F o rg e , Va . P r o v i d e n c e F o r g e , VaP . r o v i d e n c e F o r g e , Va . Horsepen Branch at Route 250 Rich Horsepen Branch at Route 250 Rich Horsepen Branch at Route 250 Rich Jordans Branch at Route 250 Rich Jordans Branch at Route 250 Rich Jordans Branch at Route 250 Rich Road near Wilkinson Upham Brook at Road near Wilkinson Upham Brook at Road near Wilkinson Upham Brook at Beaverdam Creek tributary at Ellerson, Beaverdam Creek tributary at Ellerson, Beaverdam Creek tributary at Ellerson, Chickahominy River at Route 618 near Chickahominy River at Route 618 near Chickahominy River at Route 618 near Collins Run at Route 155 near Provi Collins Run at Route 155 near Provi Collins Run at Route 155 near Provi Collins Run tributary at Route 155 near Collins Run tributary at Route 155 near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02042300 02042300 02042300 02042400 02042400 02042400 02042426 02042426 02042426 0204243150 0204243150 0204243150 02042500 02042500 02042500 02042700 02042700 02042700 02042710 02042710 Table 2. Table [mi 76 Peak-Flow Characteristics of Virginia Streams ------500 0.002 432 877 173 535 1,759 2,464 6,058 1,527 2,827 1,282 15,470 17,457 18,290 16,193 ------200 0.005 348 838 665 125 405 984 2,056 3,053 2,202 1,137 11,399 12,050 10,595 10,070 ------100 0.01 294 644 532 882 106 341 782 1,778 2,401 1,883 8,233 9,851 8,610 9,242 6,288 14,703 ------50 88.8 0.02 247 490 420 598 285 556 1,523 1,873 1,590 4,207 7,714 7,944 7,084 7,488 3,844 /s) 3 ------25 71.4 0.04 206 358 326 494 233 453 1,288 1,416 1,315 3,327 6,167 6,292 5,396 5,813 2,285 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 51.0 159 225 926 985 224 308 173 292 2,611 1,004 4,896 4,440 3,688 3,982 1,079 ------5 0.2 37.2 128 148 803 634 760 161 200 567 132 193 1,991 3,793 3,245 2,599 2,846 ------97.1 2.33 0.4292 585 101 109 238 108 1,314 2,549 2,073 1,591 1,789 ------2 0.5 90.8 89.8 87.3 87.8 539 909 193 1,797 1,846 1,376 1,574
) 2 0.32 2.47 2.47 2.47 0.37 0.37 0.37 1.61 23.6 23.6 23.6 41.3 41.3 41.3 38.7 38.7 38.7 119 119 119 (mi area Drainage - - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 P r o v i d e n c e F o r g e , Va6 . 1 2 n e a r L i g h t f o o t6 , 1 2 Va . n e a r L i g h t f o o t6 , 1 2 Va . n e a r L i g h t f o o tChapel, , Va . Va. Chapel, Va. Chapel, Va. p r e s s C h a p e l , Va . p r e s s C h a p e l , Va . p r e s s C h a p e l , Va . Swamp, Va. Swamp, Va. Swamp, Va. Burkeville, Va. Burkeville, Va. Burkeville, Va. Victoria, Va. Victoria, Va. Victoria, Va. stone, Va. Collins Run tributary at Route 155 near Branch Long Hill Swamp at Route West Branch Long Hill Swamp at Route West Branch Long Hill Swamp at Route West Cypress Swamp at Route 32 Cypress Swamp at Route 32 Cypress Swamp at Route 32 Ditch along road near Cy Washington Ditch along road near Cy Washington Ditch along road near Cy Washington Lake Drummond in Great Dismal Lake Drummond in Great Dismal Lake Drummond in Great Dismal Nottoway River at Route 723 near Nottoway River at Route 723 near Nottoway River at Route 723 near Falls Creek tributary at Route 49 near Falls Creek tributary at Route 49 near Falls Creek tributary at Route 49 near Hurricane Branch at Route 40 Black (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02042710 02042780 02042780 02042780 02043500 02043500 02043500 02043550 02043550 02043550 02043600 02043600 02043600 02044000 02044000 02044000 02044200 02044200 02044200 02044400 Table 2. Table [mi Table 2 77 500 0.002 373 245 822 624 503 3,299 1,663 1,985 2,586 5,658 1,219 60,480 52,548 35,060 71,921 43,545 24,310 30,606 56,838 27,108 200 0.005 365 790 205 950 662 489 367 844 2,303 1,253 3,426 31,711 44,490 29,074 36,012 28,460 38,758 18,270 17,721 17,978 100 0.01 358 607 178 733 553 970 444 316 695 1,813 2,434 34,800 24,128 28,559 24,050 32,358 27,002 14,490 14,555 14,527 50 0.02 350 461 153 559 452 744 394 268 561 1,307 1,635 11,310 26,810 21,668 23,690 20,080 29,792 23,800 12,522 12,036 /s) 3 25 0.04 343 337 130 410 361 550 340 219 437 1,053 1,237 8,630 9,360 9,069 20,250 15,905 17,599 16,510 21,639 18,551 Peak flow (ft Return period (years) Exceedance probability 10 0.1 211 675 729 331 102 259 253 350 268 158 295 5,746 6,536 6,270 11,339 13,370 12,013 12,320 15,612 13,878 5 0.2 81.7 451 468 322 139 171 180 233 116 116 216 203 9,248 8,281 8,605 9,454 3,974 4,691 4,449 11,519 10,448 ------60.0 2.33 0.4292 255 252 308 106 5,507 5,344 5,405 6,467 7,546 6,955 2,332 2,950 2,717 ------2 0.5 55.5 91.4 209 206 305 4,826 4,788 4,803 5,862 6,829 6,285 2,030 2,597 2,374
) 2 1.61 1.61 2.23 2.23 2.23 3.08 3.08 3.08 4.99 4.99 4.99 113 113 113 317 317 317 577 577 577 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 stone, Va. stone, Va. ings, Va. ings, Va. ings, Va. Creek, Va. Creek, Va. Creek, Va. die, Va. die, Va. die, Va. ney, Va. ney, Va. ney, Va. near Carson, Va. near Carson, Va. near Carson, Va. Va. Va. Va. Hurricane Branch at Route 40 Black Hurricane Branch at Route 40 Black Nottoway River at Route 612 near Rawl Nottoway River at Route 612 near Rawl Nottoway River at Route 612 near Rawl Nottoway River at Route 301 near Stony Nottoway River at Route 301 near Stony Nottoway River at Route 301 near Stony Stony Creek at Route 1 near (at) Dinwid Stony Creek at Route 1 near (at) Dinwid Stony Creek at Route 1 near (at) Dinwid Millrun Branch at Route 40 near McKen Millrun Branch at Route 40 near McKen Millrun Branch at Route 40 near McKen Jones Hole Swamp tributary at Route 35 Jones Hole Swamp tributary at Route 35 Jones Hole Swamp tributary at Route 35 Anderson Branch at Route 40 Sussex, Anderson Branch at Route 40 Sussex, Anderson Branch at Route 40 Sussex, (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02044400 02044400 02044500 02044500 02044500 02045500 02045500 02045500 02046000 02046000 02046000 02046200 02046200 02046200 02046400 02046400 02046400 02046500 02046500 02046500 Table 2. Table [mi 78 Peak-Flow Characteristics of Virginia Streams 500 0.002 258 247 426 465 1,106 1,549 8,769 6,653 53,990 12,490 12,306 16,960 23,955 13,070 30,513 116,182 67,803 12,447 18,555 15,291 200 0.005 227 516 208 734 310 336 9,359 6,404 8,478 5,536 3,367 48,211 11,040 42,900 60,139 13,490 12,852 13,301 16,552 12,018 100 0.01 205 393 182 563 267 288 7,452 5,103 6,696 9,605 3,864 2,653 11,200 35,710 50,669 40,862 10,365 10,930 13,409 10,366 50 0.02 184 297 158 427 226 243 8,311 5,871 4,037 5,240 9,173 8,873 8,263 8,830 2,664 2,073 29,420 48,463 36,384 10,804 /s) 3 25 0.04 311 163 214 135 184 197 3,113 4,562 4,033 7,371 6,525 7,057 6,999 8,539 7,376 1,806 1,572 23,900 34,638 27,990 Peak flow (ft Return period (years) Exceedance probability 10 0.1 138 133 107 195 135 142 3,167 2,080 2,747 5,292 4,451 4,961 5,429 5,868 5,548 1,040 1,030 17,620 25,452 21,159 5 0.2 86.0 87.6 119 128 655 708 102 105 3,911 2,313 1,458 1,977 3,190 3,623 4,291 4,239 4,276 13,460 19,073 16,028 ------97.0 65.7 2.33 0.4292 358 9,260 1,513 2,515 3,028 12,785 10,763 ------2 0.5 92.2 61.1 310 8,425 9,790 1,364 2,240 2,760 11,751
) 2 1.06 1.06 1.06 1.96 1.96 1.96 86 86 86 28 28 290 290 290 451 451 451 (mi area 1,441 1,441 1,441 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Drewryville, Va. Drewryville, Va. Drewryville, Va. D r e w r y v i l l e , Va . D r e w r y v i l l e , Va . D r e w r y v i l l e , Va . Sebrell, Va. Sebrell, Va. Sebrell, Va. Sebrell, Va. Sebrell, Va. Sebrell, Va. Dendron, Va. Dendron, Va. Dendron, Va. Va. Va. Va. near Ivor, Va. near Ivor, Va. Three Creek tributary at Route 58 near Three Creek tributary at Route 58 near Three Creek tributary at Route 58 near Musgrave Branch at Route 58 near Musgrave Branch at Route 58 near Musgrave Branch at Route 58 near Nottoway River above Route 653 near Nottoway River above Route 653 near Nottoway River above Route 653 near Assamoosick Swamp at Route 35 near Assamoosick Swamp at Route 35 near Assamoosick Swamp at Route 35 near Blackwater River at Route 617 near Blackwater River at Route 617 near Blackwater River at Route 617 near Blackwater River at Route 460 Zuni, Blackwater River at Route 460 Zuni, Blackwater River at Route 460 Zuni, Seacock Creek (Swamp) at Route 618 Seacock Creek (Swamp) at Route 618 (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02046800 02046800 02046800 02046900 02046900 02046900 02047000 02047000 02047000 02047100 02047100 02047100 02047500 02047500 02047500 02048000 02048000 02048000 02048400 02048400 Table 2. Table [mi Table 2 79 ------500 0.002 675 875 953 7,912 2,658 3,309 3,446 1,794 1,854 1,810 2,853 1,144 2,367 8,157 13,512 28,560 36,102 30,164 ------200 0.005 548 672 885 818 979 4,517 2,243 7,062 2,676 1,692 1,336 1,180 2,016 2,095 5,277 21,710 19,734 21,174 -- -- 100 0.01 465 571 681 916 723 864 3,279 1,957 5,637 2,340 1,318 1,057 1,582 1,897 4,227 34,957 17,470 16,036 17,050 -- -- 50 0.02 390 479 826 519 702 635 736 2,373 1,693 4,468 2,024 1,016 1,128 1,705 3,274 19,080 13,910 12,964 13,614 /s) 3 -- -- 25 0.04 323 757 393 634 380 525 552 913 628 1,689 1,448 3,453 1,719 1,518 2,558 15,495 10,910 10,294 10,706 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 245 486 290 431 239 343 448 582 487 7,111 1,035 1,148 2,314 1,329 7,665 7,472 1,273 1,699 12,519 -- -- 5 0.2 681 933 193 327 219 307 158 237 372 387 377 1,628 1,049 9,931 5,641 5,166 5,474 1,084 1,168 ------2.33 0.4292 696 138 192 287 217 265 858 689 3,711 6,854 ------2 0.5 646 126 171 269 177 239 807 582 4,974 3,344
) 2 8.43 8.43 8.43 2.72 2.72 2.72 1.22 1.22 1.22 9.06 9.06 28 102 102 102 578 578 578 613 613 613 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 near Ivor, Va. n e a r B e r l i n ( a t n U e n a i r t y B ) e , r l Va i . n ( a t n U e n a i r t y B ) e , r l Va i . n ( a t Burdette, U n i t y ) , Va. Va . Burdette, Va. Burdette, Va. Burdette, Va. Burdette, Va. Burdette, Va. 1 8 9 n e a r H o l l a n d , Va1 8 . 9 n e a r H o l l a n d , Va1 8 . 9 n e a r H o l l a n d , VaBriery, . Va. Briery, Va. Briery, Va. Keysville, Va. Keysville, Va. Seacock Creek (Swamp) at Route 618 Seacock Swamp (Creek) at Route 635 Seacock Swamp (Creek) at Route 635 Seacock Swamp (Creek) at Route 635 Blackwater River at Route 603 near Blackwater River at Route 603 near Blackwater River at Route 603 near B l a c k w a B t l e a r c k R w i a B v t l e e a r r c k n R w e Cypress Swamp at Route 635 near i a a v t r e e r r F r n R a e i n a v k r e l r i F n r n , Cypress Swamp at Route 635 near a e n a Va k r l . i F n r , a n Va k l . i n Cypress Swamp at Route 635 near , Va . Blackwater River tributary 1 at Route Blackwater River tributary 1 at Route Blackwater River tributary 1 at Route North Meherrin River at Route 360 near North Meherrin River at Route 360 near North Meherrin River at Route 360 near North Meherrin River at Route 687 near North Meherrin River at Route 687 near (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02048400 02048500 02048500 02048500 02049000 02049000 02049000 02049500 02049500 02049500 02049700 02049700 02049700 02050050 02050050 02050050 02050400 02050400 02050400 02050500 02050500 Table 2. Table [mi 80 Peak-Flow Characteristics of Virginia Streams -- -- 500 0.002 849 2,914 2,390 3,089 1,283 6,647 2,832 2,764 18,740 21,186 43,830 70,271 34,090 15,488 20,864 36,140 19,581 49,691 -- -- 200 0.005 679 2,462 1,762 1,714 9,495 2,168 1,042 4,375 1,747 35,110 15,070 12,651 14,027 37,943 35,968 21,790 12,460 30,950 -- -- 100 0.01 567 890 2,228 1,184 1,341 7,698 9,388 1,705 3,490 1,237 11,522 12,620 10,318 29,430 31,663 30,191 15,240 27,270 -- -- 50 0.02 780 942 468 722 839 1,980 8,621 9,489 6,274 7,150 1,222 2,660 10,420 24,420 29,099 26,140 10,430 23,790 /s) 3 -- -- 25 0.04 501 767 380 987 585 591 1,711 8,450 6,525 7,437 6,943 4,799 5,277 2,093 20,010 21,152 20,446 20,480 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 264 486 280 631 428 349 1,382 6,149 4,493 5,148 3,808 3,265 3,370 1,379 14,940 15,247 15,080 16,310 -- -- 5 0.2 152 321 212 421 304 942 215 1,107 4,596 3,186 3,731 2,239 2,292 2,281 11,560 11,241 11,412 13,230 -- -- 71.5 2.33 811 0.4292 179 144 237 184 550 106 3,002 1,968 2,395 8,099 7,356 7,772 1,064 1,395 1,312 9,724 -- -- 2 0.5 59.4 85.9 744 145 881 130 194 157 461 1,116 2,684 1,713 2,125 7,407 6,652 7,085 1,201 8,966
) 2 9.06 0.87 0.87 0.87 1.42 1.42 1.42 6.13 6.13 6.13 56 56 56 30.8 30.8 30.8 552 552 552 744 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Keysville, Va. Lunenburg, Va. Lunenburg, Va. Lunenburg, Va. renceville, Va. renceville, Va. renceville, Va. renceville, Va. renceville, Va. renceville, Va. 6 1 8 ) n e a r C o c h r a n ,6 1 Va 8 ) . n e a r C o c h r a n ,6 1 Va 8 ) . n e a r C o c h r a n ,Va. Va . Va. Va. ille, Va. ille, Va. ille, Va. Va. North Meherrin River at Route 687 near North Meherrin River at Route 40 near North Meherrin River at Route 40 near North Meherrin River at Route 40 near Saddletree Creek at Route 58 near Law Saddletree Creek at Route 58 near Law Saddletree Creek at Route 58 near Law Meherrin River at Route 715 near Law Meherrin River at Route 715 near Law Meherrin River at Route 715 near Law Great Creek at Route 763 (old Great Creek at Route 763 (old Great Creek at Route 763 (old Rocky Run at Route 641 near Dolphin, Rocky Run at Route 641 near Dolphin, Rocky Run at Route 641 near Dolphin, Rocky Run at Route 642 Lawrencev Rocky Run at Route 642 Lawrencev Rocky Run at Route 642 Lawrencev Meherrin River at Route 301 Emporia, (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02050500 02051000 02051000 02051000 02051400 02051400 02051400 02051500 02051500 02051500 02051600 02051600 02051600 02051650 02051650 02051650 02051700 02051700 02051700 02052000 Table 2. Table [mi Table 2 81 ------500 0.002 82,168 21,060 23,581 13,670 28,085 18,984 26,960 35,370 35,910 50,560 41,170 43,876 22,254 200 0.005 43,788 34,089 15,470 13,955 14,628 10,350 16,378 13,088 21,230 30,391 25,015 29,130 32,592 30,264 30,590 33,815 31,298 41,720 34,639 39,343 34,910 100 0.01 8,267 11,405 11,669 36,650 29,923 12,050 13,430 10,817 17,440 24,671 20,731 24,870 27,668 25,918 26,870 28,727 27,352 35,680 29,441 33,288 30,400 50 0.02 9,611 9,114 9,230 9,466 6,497 11,476 34,103 26,999 14,060 19,278 16,691 20,970 23,304 21,968 23,390 24,212 23,643 30,150 24,825 27,821 26,090 /s) 3 25 0.04 7,118 6,907 7,248 5,000 8,603 6,906 11,060 20,110 24,660 21,861 14,947 13,220 17,390 19,271 18,306 20,042 20,085 25,060 20,562 22,826 21,940 Peak flow (ft Return period (years) Exceedance probability 10 0.1 5,011 4,471 4,837 3,373 5,988 4,934 7,638 9,228 17,882 16,953 10,168 13,070 14,329 13,780 16,030 14,923 15,536 18,940 15,325 16,863 16,690 5 0.2 3,019 3,566 3,388 2,363 4,285 3,512 5,396 7,096 6,561 11,408 11,726 13,251 13,239 10,060 10,938 10,592 13,060 12,239 14,650 12,847 12,830 2.33 0.4292 8,736 9,326 1,716 2,214 2,032 1,414 2,684 2,123 3,196 4,268 3,984 6,848 7,320 7,132 9,723 7,651 8,682 7,876 8,723 8,537 10,060 2 0.5 9,116 7,940 8,566 1,483 1,933 1,762 1,237 2,356 1,844 2,776 3,729 3,483 6,188 6,542 6,397 9,006 6,842 7,940 7,045 7,873 7,631
) 2 68.7 68.7 68.7 95.9 95.9 95.9 744 744 109 109 109 254 254 254 270 270 270 281 281 281 384 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. near Brink, Va. near Brink, Va. near Brink, Va. n e a r E m p o r i a , Va . n e a r E m p o r i a , Va . n e a r E m p o r i a , Va . n e a r S h a w s v i l l e , Va .n e a r S h a w s v i l l e , Va .n e a r S h a w s v i l l e , Va .Va. Va. Va. Va. Va. Va. Roanoke, Va. Meherrin River at Route 301 Emporia, Meherrin River at Route 301 Emporia, Fountains (Fontaine) Creek at Route 603 Fountains (Fontaine) Creek at Route 603 Fountains (Fontaine) Creek at Route 603 Fountains (Fontaine) Creek at Route 639 Fountains (Fontaine) Creek at Route 639 Fountains (Fontaine) Creek at Route 639 South Fork Roanoke River at Route 637 South Fork Roanoke River at Route 637 South Fork Roanoke River at Route 637 Roanoke River at Route 603 Lafayette, Roanoke River at Route 603 Lafayette, Roanoke River at Route 603 Lafayette, R o a n o k e R o R a i n v o e k r e R n o R e a i a n v r o e k r W at Glenvar, Roanoke River at Route 1154 a e b n u R e n i a , v r e Va r W a . b n u e n a , r at Glenvar, Roanoke River at Route 1154 Va W a . b u n , Va . at Glenvar, Roanoke River at Route 1154 Street at Walnut Roanoke River at (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02052000 02052000 02052500 02052500 02052500 02053000 02053000 02053000 02053800 02053800 02053800 02054500 02054500 02054500 02054510 02054510 02054510 02054530 02054530 02054530 02055000 Table 2. Table [mi 82 Peak-Flow Characteristics of Virginia Streams ------500 0.002 449 15,130 59,990 39,220 34,320 43,910 100,100 200 0.005 392 5,095 6,993 1,678 41,817 37,471 10,820 49,540 49,562 49,547 29,140 20,522 24,319 27,440 31,361 29,080 33,960 44,393 37,936 80,670 89,037 112,588 100 0.01 351 8,234 4,168 5,368 1,318 35,675 32,626 42,400 42,426 42,409 22,860 16,586 19,121 22,800 25,468 24,031 27,560 36,192 31,187 67,800 92,756 75,221 50 0.02 312 919 6,139 3,394 4,106 30,185 28,050 35,850 36,009 35,915 17,590 12,762 14,506 18,610 19,925 19,283 22,010 28,703 25,126 56,310 76,297 63,059 /s) 3 25 0.04 275 669 4,453 2,672 3,070 9,809 30,110 25,127 23,658 29,850 29,971 13,190 10,888 14,840 15,459 15,190 17,210 22,442 19,907 46,040 60,898 51,784 Peak flow (ft Return period (years) Exceedance probability 10 0.1 227 416 2,739 1,851 2,014 8,499 6,593 7,094 11,860 18,862 18,026 22,610 22,749 22,686 10,430 10,526 10,491 15,445 13,970 34,070 43,126 38,272 5 0.2 191 262 1,758 1,312 1,387 5,673 4,537 4,788 7,482 7,354 7,393 8,438 14,541 13,949 17,540 17,657 17,609 10,926 10,048 25,980 31,542 28,930 2.33 0.4292 921 786 810 150 134 9,877 9,401 3,128 2,671 2,756 4,518 4,431 4,453 5,138 6,709 6,239 12,110 12,116 12,114 17,620 20,376 19,267 2 0.5 112 777 685 703 140 4,511 8,858 8,406 2,672 2,319 2,383 3,942 3,873 3,890 5,895 5,493 10,990 10,890 10,933 15,940 18,163 17,294
) 2 0.78 0.78 11.7 11.7 11.7 55.8 55.8 55.8 115 115 115 384 384 509 509 509 208 208 208 (mi area 1,017 1,017 1,017 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Roanoke, Va. Roanoke, Va. Daleville, Va. Daleville, Va. Daleville, Va. Niagara, Va. Niagara, Va. Niagara, Va. Va. Va. Va. R o c k y M o u n t , Va . R o c k y M o u n t , Va . R o c k y M o u n t , Va . R o c k y M o u n t , Va . R o c k y M o u n t , Va . Roanoke River at Walnut Street at Walnut Roanoke River at Street at Walnut Roanoke River at Creek below railroad bridge near Tinker Creek below railroad bridge near Tinker Creek below railroad bridge near Tinker Roanoke River below powerplant at Roanoke River below powerplant at Roanoke River below powerplant at Back Creek at Route 660 near Dundee, Back Creek at Route 660 near Dundee, Back Creek at Route 660 near Dundee, Blackwater River at Route 122 near Blackwater River at Route 122 near Blackwater River at Route 122 near B l a c k w a B t l e a r c k R w i a B v t l e e a r r c k n R w e i R a o a v t a r e e n r r o U k n n R e i e i R o o a v R a n i r e n v r o e H U k r a n n e l i e R n l o o a R e a , n i r a n v r o e Va H U k r T a n Powder Mill Creek at Route 220 o . e l i s n l o h R e , e n i a s v r , e Va H r T a o . Va l s n . l h e , e a s r , Va Powder Mill Creek at Route 220 T o . Va s . h e s , Va . (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02055000 02055000 02055100 02055100 02055100 02056000 02056000 02056000 02056650 02056650 02056650 02056900 02056900 02056900 02057000 02057000 02057000 02057500 02057500 02057500 02057700 02057700 Table 2. Table [mi Table 2 83 ------500 0.002 6,347 9,030 7,423 33,830 21,889 27,860 52,740 67,620 102,700 103,400 -- 200 0.005 483 4,549 5,793 5,132 22,640 13,035 17,168 74,320 60,335 68,677 41,380 63,405 46,171 85,980 51,490 41,838 46,956 45,015 136,818 96,257 -- 100 0.01 437 3,491 4,648 4,077 16,530 10,638 13,007 57,550 49,359 53,971 34,160 51,900 38,555 74,050 41,250 34,086 37,605 36,705 112,965 83,155 -- 50 0.02 384 8,912 2,641 3,629 3,179 11,920 10,055 44,030 39,620 41,931 27,940 41,740 31,870 63,080 93,634 32,490 26,970 29,436 29,126 71,354 /s) 3 -- 25 0.04 335 8,465 6,737 7,407 1,961 2,827 2,427 33,150 31,189 32,130 22,580 32,894 25,985 52,970 75,059 25,010 21,059 22,639 22,780 59,977 Peak flow (ft Return period (years) Exceedance probability -- 10 0.1 269 5,194 4,645 4,828 1,269 1,884 1,642 21,970 21,668 21,793 16,570 22,887 19,128 40,710 53,473 16,830 14,467 15,256 15,684 45,732 -- 5 0.2 212 867 3,436 3,297 3,344 1,300 1,130 11,720 11,101 15,400 15,498 15,463 12,680 16,399 14,440 32,070 39,384 10,213 10,639 35,447 -- 2.33 0.4292 143 513 771 661 1,994 2,040 2,023 9,517 9,676 9,628 8,820 9,614 6,900 6,250 6,406 6,821 10,267 22,700 25,714 24,309 -- 2 0.5 128 450 652 564 1,750 1,777 1,767 8,451 8,543 8,516 8,063 9,072 8,631 6,005 5,488 5,608 5,995 20,750 22,990 21,975
) 2 0.78 11 11 11 59.6 59.6 59.6 351 351 351 382 382 382 188 188 188 213 213 (mi area 1,418 1,418 1,418 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 R o c k y M o u n t , Va . Level, Va. Level, Va. Level, Va. Va. Va. Va. Gretna, Va. Gretna, Va. Gretna, Va. Montvale, Va. Montvale, Va. Montvale, Va. dleston, Va. dleston, Va. dleston, Va. Va. Va. Powder Mill Creek at Route 220 S n o w C r S e n e o k w a C t r S e n R e o o k w u t a C Pigg River above Route 40 near Sandy e t r e 9 R e 6 o k 9 u t a a e t t 9 R S 6 o a 9 u Pigg River above Route 40 near Sandy g t o a e , t 9 Va S 6 a 9 . g o a , t Va S a Pigg River above Route 40 near Sandy . g o , Va . Toshes, Pigg River along Route 605 near Toshes, Pigg River along Route 605 near Toshes, Pigg River along Route 605 near near Roanoke River at Route 1109 near Roanoke River at Route 1109 near Roanoke River at Route 1109 South Fork Goose Creek at Route 607 South Fork Goose Creek at Route 607 South Fork Goose Creek at Route 607 Goose Creek above Route 732 near Hud Goose Creek above Route 732 near Hud Goose Creek above Route 732 near Hud Goose Creek at Route 626 Huddleston, Goose Creek at Route 626 Huddleston, (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02057700 02058000 02058000 02058000 02058400 02058400 02058400 02058500 02058500 02058500 02059000 02059000 02059000 02059450 02059450 02059450 02059500 02059500 02059500 02060000 02060000 Table 2. Table [mi 84 Peak-Flow Characteristics of Virginia Streams ------500 0.002 7,036 3,981 36,360 95,730 73,710 148,500 191,200 -- -- 200 0.005 4,911 4,355 2,500 3,062 3,091 28,490 31,201 29,505 70,290 56,625 64,291 59,260 61,437 59,989 123,000 156,434 130,403 152,000 -- 100 0.01 2,969 1,973 2,256 2,531 3,906 3,951 23,380 25,336 24,191 54,950 46,291 50,843 49,620 50,271 49,864 105,700 129,357 111,728 126,600 -- 50 0.02 1,979 1,398 1,546 2,052 2,841 2,979 89,860 95,107 18,900 19,818 19,325 42,360 37,065 39,634 40,970 40,380 40,721 107,785 104,500 /s) 3 -- 25 0.04 2,116 1,281 1,026 1,084 1,643 2,319 75,360 86,660 79,208 14,980 15,374 15,183 32,060 29,136 30,424 33,230 31,800 32,551 85,230 Peak flow (ft Return period (years) Exceedance probability -- 10 0.1 674 646 652 1,190 1,361 1,630 57,920 61,992 59,623 10,540 10,467 10,497 21,290 20,203 20,610 24,190 22,105 23,034 63,290 -- 5 0.2 382 412 407 901 890 7,649 7,312 7,428 1,123 45,700 45,878 45,787 14,850 14,417 14,556 18,090 15,820 16,685 48,840 -- 2.33 0.4292 173 216 210 617 484 648 4,797 4,404 4,517 9,005 8,971 8,980 9,888 11,840 10,511 32,560 30,174 31,227 34,230 -- 2 0.5 142 182 176 562 412 527 4,246 3,849 3,959 7,938 7,912 7,919 8,732 9,306 29,830 27,033 28,231 10,590 31,330
) 2 1.54 1.54 1.54 4.87 4.87 4.87 114 114 114 213 315 315 315 362 362 362 (mi area 1,782 1,782 1,782 2,404 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. ( A l t e r n a t e ) a t A( l A t l a t v e i r s n t a a t , e ) Va . a t A( l A t l a t v e i r s n t a a t , e ) Va . a t A2 l 2 t 1 a v n i e s a r t a B , e d Va f o . r d , Va2 2 . 1 n e a r B e d f o r d , Va2 2 . 1 n e a r B e d f o r d , VaVa. . Va. Va. ( n e a r O t t e r H( i n l e l a , r n O e t a t r e r B e H( d i n f l e o l a r , r d ) n O , e t a t Va r e . r B e H6 d i 8 f 2 l o l n r e , a d r ) n , E e v a i Va n r g . t o B n e ,6 d 8 Va f 2 . o n r e a d r ) , E v i Va n g . t o n ,6 8 Va 2 . n e a r E v i n g t o n ,Altavista, Va . Va. Altavista, Va. Altavista, Va. 5 0 1 a t B r o o k n e a l , Va . Goose Creek at Route 626 Huddleston, Roanoke (Staunton) River at Route 29 Roanoke (Staunton) River at Route 29 Roanoke (Staunton) River at Route 29 Big Otter River (Otter River) at Route Big Otter River (Otter River) at Route Big Otter River (Otter River) at Route Chestnut Branch near Forest at Goode, Chestnut Branch near Forest at Goode, Chestnut Branch near Forest at Goode, Nininger Creek at Route 43 near Forest Nininger Creek at Route 43 near Forest Nininger Creek at Route 43 near Forest Big Otter River (Otter River) at Route Big Otter River (Otter River) at Route Big Otter River (Otter River) at Route Branch near Tardy Big Otter River above Branch near Tardy Big Otter River above Branch near Tardy Big Otter River above Roanoke (Staunton) River above Route (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02060000 02060500 02060500 02060500 02061000 02061000 02061000 02061150 02061150 02061150 02061300 02061300 02061300 02061500 02061500 02061500 02062000 02062000 02062000 02062500 Table 2. Table [mi Table 2 85 ------500 0.002 691 951 5,209 3,640 1,915 7,757 1,089 11,830 19,818 74,720 37,322 54,806 ------200 0.005 507 737 844 3,500 3,103 1,399 7,988 6,091 11,901 50,890 21,252 32,838 186,458 160,151 ------100 0.01 398 567 689 2,779 2,732 9,694 1,090 5,867 5,444 37,630 17,521 24,821 154,488 134,076 ------50 0.02 309 752 370 520 2,077 2,387 8,057 4,255 4,867 27,490 15,313 19,515 129,615 112,117 /s) 3 ------25 0.04 311 237 617 415 6,111 1,648 2,066 3,034 3,899 11,371 91,983 19,750 14,294 104,618 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 162 388 190 287 1,076 1,670 4,197 8,001 9,285 1,868 3,051 75,243 68,332 12,300 ------5 0.2 117 729 254 122 195 1,384 2,970 8,221 5,779 6,522 1,237 2,285 56,036 52,344 ------75.9 64.9 2.33 0.4292 421 140 714 111 1,065 1,829 4,814 3,669 4,062 1,493 37,210 35,886 ------2 0.5 68.4 92.8 51.1 113 350 996 626 1,588 4,229 3,251 3,601 1,324 33,426 32,521
) 2 3.85 3.85 3.85 0.57 0.57 0.57 0.15 0.15 0.15 49.3 49.3 49.3 39.2 165 165 165 (mi area 2,404 2,404 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 5 0 1 a t B r o o k n e a l , Va5 0 . 1 a t B r o o k n e a l , Appomat VaRiver) at Route 719 near . tox,Va. Appomat River) at Route 719 near tox,Va. Appomat River) at Route 719 near tox,Va. a b o v e R o u t e a 6 b 4 o 6 v e a t R o S u p t r e i na 6 g b 4 o 6 M v i e a l t l R s o S , u p t r Va e i . nVa. 6 g 4 6 M i a l t l s S , p r Va i . nVa. g M i l l s , Va .Va. Rustburg, Va. Rustburg, Va. Rustburg, Va. Va. Va. Va. Creek, Va. Roanoke (Staunton) River above Route Roanoke (Staunton) River above Route Caldwells Creek (East Fork Falling Caldwells Creek (East Fork Falling Caldwells Creek (East Fork Falling Falling River (East Fork River) Falling River (East Fork River) Falling River (East Fork River) Button Creek at Route 24 near Rustburg, Button Creek at Route 24 near Rustburg, Button Creek at Route 24 near Rustburg, Button Creek tributary at Route 24 near Button Creek tributary at Route 24 near Button Creek tributary at Route 24 near Falling River at Route 643 near Naruna, Falling River at Route 643 near Naruna, Falling River at Route 643 near Naruna, Little Falling River at Route 618 Hat (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02062500 02062500 02063000 02063000 02063000 02063500 02063500 02063500 02063600 02063600 02063600 02063700 02063700 02063700 02064000 02064000 02064000 02064500 Table 2. Table [mi 86 Peak-Flow Characteristics of Virginia Streams ------500 0.002 3,980 3,342 3,618 2,610 3,885 3,180 17,574 72,560 43,600 62,205 25,090 28,345 12,210 33,597 14,117 14,117 26,607 168,500 169,597 168,764 -- -- 200 0.005 2,814 2,330 2,513 1,856 2,675 2,271 9,749 9,233 10,660 59,740 24,505 43,695 18,500 16,517 17,408 19,300 198,815 138,200 85,044 120,379 -- -- 100 0.01 2,112 8,664 2,126 1,835 1,935 1,412 1,793 8,129 7,254 51,010 20,263 35,557 14,460 13,547 13,924 15,880 164,845 118,100 72,171 100,860 -- -- 50 0.02 7,132 1,575 1,324 1,400 1,056 1,543 1,342 6,694 5,758 11,110 11,583 11,401 43,040 17,930 29,496 99,890 13,764 138,653 71,134 88,457 /s) 3 -- -- 25 0.04 773 5,432 1,137 1,066 1,088 1,236 1,041 8,342 8,681 8,550 5,422 4,267 35,740 13,244 23,286 83,490 10,256 112,073 50,199 69,587 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 698 684 688 487 798 687 3,714 9,375 5,429 6,045 5,843 3,956 7,188 2,928 26,980 15,841 80,763 64,100 37,423 50,936 -- -- 5 0.2 449 457 455 322 535 460 4,115 2,618 6,805 3,685 4,327 2,978 5,174 2,024 11,826 20,870 60,285 50,760 28,390 39,531 -- -- 2.33 0.4292 238 258 252 181 305 257 2,111 2,711 1,603 4,352 8,172 2,488 1,984 3,268 1,184 14,360 40,172 36,640 19,378 28,459 -- -- 2 0.5 202 212 209 156 251 213 1,386 3,876 7,482 1,827 2,381 2,166 1,786 2,886 1,017 13,020 36,122 33,740 18,030 26,552
) 2.2 2.2 2.2 2 1.65 1.65 1.65 39.2 39.2 97.6 97.6 97.6 222 222 222 135 135 (mi area 2,682 2,682 2,682 2,966 2,966 2,966 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Creek, Va. Creek, Va. Brookneal, Va. Brookneal, Va. Brookneal, Va. B r o o k n e a l , Va . B r o o k n e a l , Va . B r o o k n e a l , Va . at Clarkton, Va. at Clarkton, Va. at Clarkton, Va. pomattox, Va. pomattox, Va. pomattox, Va. at Randolph, Va. at Randolph, Va. at Randolph, Va. Little Falling River at Route 618 Hat Little Falling River at Route 618 Hat Falling River below Hat Creek near Falling River below Hat Creek near Falling River below Hat Creek near Snake Creek at Route 501 near Snake Creek at Route 501 near Snake Creek at Route 501 near Roanoke (Staunton) River at Route 620 Roanoke (Staunton) River at Route 620 Roanoke (Staunton) River at Route 620 Ap Right Hand Fork at Route 727 near Ap Right Hand Fork at Route 727 near Ap Right Hand Fork at Route 727 near C u b C r e C e u k b a C t r e C R e u o k b u t a C e t r Roanoke (Staunton) River at Route 746 e 4 R e 0 o k u a t a t e t P 4 R h 0 o e u n a t i t Roanoke (Staunton) River at Route 746 e x , P 4 h 0 Va e n a . i t x , P h Va e n . Roanoke (Staunton) River at Route 746 i x , Va . R o a n o k R e o a C n r o e k e e k C a r t e e R k o u a t t e R 6 o 1 u 2 t e a t 6 1 S 2 a x a e t , S V a a . x e , V a . (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02064500 02064500 02065000 02065000 02065000 02065100 02065100 02065100 02065200 02065200 02065200 02065300 02065300 02065300 02065500 02065500 02065500 02066000 02066000 02066000 02066500 02066500 Table 2. Table [mi Table 2 87 -- -- 500 0.002 381 8,115 5,584 1,259 4,873 1,871 8,413 6,323 51,170 26,445 36,716 35,310 29,889 32,984 17,093 279,400 177,260 242,886 200 0.005 313 457 4,012 5,252 1,231 1,042 3,292 1,542 6,741 4,448 12,665 34,120 15,500 21,968 25,460 17,340 21,309 214,200 88,557 156,285 100 0.01 266 964 893 397 2,611 3,093 4,206 1,343 5,615 3,524 10,801 24,780 12,696 16,593 19,650 14,236 16,693 173,700 75,216 124,586 50 0.02 224 664 757 328 9,365 2,357 3,256 1,941 1,125 4,598 2,740 17,740 10,796 12,914 14,970 12,224 13,397 139,400 74,396 105,887 /s) 3 25 0.04 186 480 631 919 271 8,110 7,297 1,769 2,545 1,544 9,466 9,145 3,682 2,096 11,220 12,450 10,031 110,400 52,423 79,677 Peak flow (ft Return period (years) Exceedance probability 10 0.1 141 296 480 690 199 5,456 1,171 1,690 1,005 7,470 5,632 6,125 7,369 6,380 6,741 2,610 1,427 78,770 39,147 55,137 5 0.2 822 109 184 373 679 502 991 144 5,119 4,016 1,161 4,813 4,023 4,241 4,575 4,774 1,891 58,830 29,740 41,449 75.5 92.9 85.4 2.33 0.4292 512 685 259 391 313 593 3,114 2,555 2,661 2,512 2,559 2,874 2,970 1,163 39,600 20,343 28,788 2 0.5 68.7 77.2 73.7 456 578 235 325 271 512 2,261 2,300 2,201 2,234 2,752 2,528 2,621 1,020 35,920 18,955 26,706
) 2 8.97 8.97 8.97 0.46 0.46 0.46 3.39 3.39 3.39 85.5 85.5 85.5 26.3 135 108 108 108 (mi area 3,227 3,227 3,227 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 liesburg, Va. liesburg, Va. liesburg, Va. near Clover, Va. near Clover, Va. near Clover, Va. M e a d o w s o f D a n , Va .M e a d o w s o f D a n , Va .M e a d o w s o f D a n , Va .Va. Va. Va. Nettleridge, Va. Nettleridge, Va. Nettleridge, Va. Spencer, Va. Spencer, Va. Spencer, Va. ( R o u t e 7 9 8 ) n e a r Wo o l w i n e , Va . R o a n oWyl Sandy Creek at Route 608 near k e C r e e k a tWyl Sandy Creek at Route 608 near R o u t e 6 1 2 Wyl Sandy Creek at Route 608 near a t S a x e , V a Roanoke (Staunton) River at Route 360 . Roanoke (Staunton) River at Route 360 Roanoke (Staunton) River at Route 360 Maple Swamp Branch at Route 58 near Maple Swamp Branch at Route 58 near Maple Swamp Branch at Route 58 near Anglin Branch at Route 58 near Stuart, Anglin Branch at Route 58 near Stuart, Anglin Branch at Route 58 near Stuart, South Mayo River at Route 700 near South Mayo River at Route 700 near South Mayo River at Route 700 near North Mayo River below Route 629 near North Mayo River below Route 629 near North Mayo River below Route 629 near Smith River at Church (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02066500 02066600 02066600 02066600 02067000 02067000 02067000 02067810 02067810 02067810 02069600 02069600 02069600 02069700 02069700 02069700 02070000 02070000 02070000 02071530 Table 2. Table [mi 88 Peak-Flow Characteristics of Virginia Streams ------500 0.002 7,228 70,590 87,300 23,527 10,636 31,850 30,321 31,285 133,000 -- -- 200 0.005 8,943 8,374 5,369 7,697 63,112 13,203 53,720 45,263 99,910 50,485 75,005 69,370 67,478 13,926 25,080 17,569 21,624 49,991 -- -- 100 0.01 7,532 6,700 4,250 6,420 11,381 10,618 43,290 36,909 79,360 41,218 58,690 57,700 51,657 55,646 20,680 14,428 17,532 40,225 -- -- 50 0.02 8,030 6,097 4,977 3,332 9,589 5,420 34,520 29,294 62,070 32,854 44,995 47,450 41,538 45,178 16,810 12,403 14,437 31,770 /s) 3 -- -- 25 0.04 6,112 4,880 3,750 2,579 7,231 4,145 9,275 11,158 27,150 22,914 47,590 25,761 33,844 38,440 32,731 35,952 13,430 24,709 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 4,052 3,439 2,452 1,786 4,999 3,090 9,587 6,474 7,657 19,170 15,779 32,010 17,799 22,161 28,150 22,771 25,376 16,969 -- -- 5 0.2 2,745 2,438 1,634 1,306 3,557 2,234 7,071 4,645 5,551 11,170 14,190 22,440 12,650 15,180 21,340 16,313 18,407 12,054 -- -- 2.33 0.4292 916 861 1,577 1,454 9,430 6,866 7,822 9,051 2,209 1,381 4,564 2,920 3,583 7,472 10,211 11,688 13,520 14,450 -- -- 2 0.5 785 778 1,361 1,263 8,525 6,035 6,887 7,928 9,021 1,928 1,210 4,074 2,570 3,196 6,599 11,870 13,080 10,386
) 2 26.3 26.3 12.1 12.1 12.1 68.4 68.4 68.4 111 111 111 215 215 215 259 259 259 379 379 379 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 ( R o u t e 7 9 8 ) n e( a R r o u Wo t e o l 7 w 9 i 8 n ) e , n erum, Va a . r Va. Wo o l w i n e , rum, Va . Va. rum, Va. Philpott, Va. Philpott, Va. Philpott, Va. Bassett, Va. Bassett, Va. Bassett, Va. ville, Va. ville, Va. ville, Va. M a r t i n s v i l l e (M O a l r d t i L n i s b v e i r l t l y e ) , ( M O Va a l . r d t i L n i s b v e i r l t l y e ) , ( Danville, O Va l . d L i bVa. e r t y ) , Danville, Va . Va. Danville, Va. Smith River at Church Smith River at Church Nicholas Creek at Route 605 near Fer Nicholas Creek at Route 605 near Fer Nicholas Creek at Route 605 near Fer Smith River below Philpott Dam near Smith River below Philpott Dam near Smith River below Philpott Dam near Smith River at Route 666 (north) Smith River at Route 666 (north) Smith River at Route 666 (north) Smith River below Route 58 at Martins Smith River below Route 58 at Martins Smith River below Route 58 at Martins Leatherwood Creek at Route 650 near Leatherwood Creek at Route 650 near Leatherwood Creek at Route 650 near Sandy River above Route 863 near Sandy River above Route 863 near Sandy River above Route 863 near (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02071530 02071530 02071800 02071800 02071800 02072000 02072000 02072000 02072500 02072500 02072500 02073000 02073000 02073000 02073500 02073500 02073500 02074500 02074500 02074500 Table 2. Table [mi Table 2 89 ------500 0.002 565 848 1,344 2,429 3,913 3,037 7,957 23,430 142,900 140,109 142,364 142,092 157,872 13,796 121,800 163,381 128,031 ------200 0.005 444 683 1,011 1,873 2,693 2,265 5,159 8,396 71,393 72,318 79,642 15,070 82,184 96,622 117,800 105,129 100,700 ------100 0.01 365 783 562 1,515 2,127 1,836 4,129 6,108 60,366 88,474 61,165 67,495 10,670 86,720 69,695 82,422 101,100 ------50 0.02 296 525 419 1,204 1,554 1,405 7,455 3,192 4,377 86,110 58,603 76,952 59,445 66,147 74,190 68,490 72,641 /s) 3 ------25 0.04 236 436 936 342 1,113 1,245 5,121 2,497 3,262 72,660 41,622 61,744 42,200 46,793 62,910 48,394 58,702 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 167 270 637 804 745 231 3,000 1,656 1,988 56,820 30,804 45,703 31,248 34,788 49,620 36,026 44,731 ------5 0.2 122 175 448 539 508 156 1,910 1,138 1,332 45,950 23,224 35,977 23,570 26,330 40,490 27,297 35,595 ------77.6 94.9 88.4 2.33 0.4292 266 307 292 671 781 1,056 17,911 34,460 15,708 26,646 15,953 30,830 18,599 26,532 ------2 0.5 68.9 75.5 73.0 232 253 245 916 565 669 32,100 14,525 25,021 14,758 16,626 28,840 17,284 24,929
) 2 0.29 0.29 0.29 2.23 2.23 2.23 8.64 8.64 8.64 (mi area 2,116 2,116 2,116 2,060 2,060 2,060 2,587 2,587 2,587 2,762 2,762 2,762 Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. Va. Danville, Va. Danville, Va. Danville, Va. ille, Va. ille, Va. ille, Va. Turbeville, Va. Turbeville, Va. Turbeville, Va. ille, Va. ille, Va. ille, Va. Boston, Va. Boston, Va. Boston, Va. Dan River at railroad bridge Danville, Dan River at railroad bridge Danville, Dan River at railroad bridge Danville, Dan River at wastewater outfall near Dan River at wastewater outfall near Dan River at wastewater outfall near Turbev Powells Creek at Route 58 near Turbev Powells Creek at Route 58 near Turbev Powells Creek at Route 58 near Creek at Route 58 near Winns Little Creek at Route 58 near Winns Little Creek at Route 58 near Winns Little D a n R i v D e a r n a R t i v D R e a o r n u t a R e t iTurbev Lawsons Creek at Route 658 v 6 R e 5 o r 8 u t a a e t t 6 R P 5 o a 8 u c t e aTurbev Lawsons Creek at Route 658 e s t , 6 P 5 Va a 8 c . e a s t , P Va a c .Turbev Lawsons Creek at Route 658 e s , Va . Dan River at railroad bridge South Dan River at railroad bridge South Dan River at railroad bridge South (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02075000 02075000 02075000 02075045 02075045 02075045 02075350 02075350 02075350 02075450 02075450 02075450 02075500 02075500 02075500 02075900 02075900 02075900 02076000 02076000 02076000 Table 2. Table [mi 90 Peak-Flow Characteristics of Virginia Streams -- -- 500 0.002 7,614 5,308 6,340 1,203 3,715 1,666 4,399 8,214 5,842 4,669 53,820 69,937 14,100 49,971 27,530 60,285 59,033 18,769 200 0.005 945 5,311 5,326 3,560 4,246 2,568 1,323 3,486 4,320 3,185 4,864 3,647 41,430 37,778 39,910 12,120 27,766 15,125 22,380 32,972 100 0.01 780 1,116 4,004 2,828 3,245 2,026 2,878 4,254 3,571 2,353 3,629 2,758 33,630 31,522 32,671 10,720 23,020 13,503 18,970 27,435 50 0.02 638 904 2,117 2,961 2,386 1,474 2,337 3,297 2,866 1,713 2,541 2,023 9,383 26,970 28,958 27,924 20,590 12,243 15,920 24,908 /s) 3 25 0.04 515 728 2,143 1,678 1,831 1,183 1,855 2,576 2,254 1,223 1,757 1,458 8,109 21,300 21,054 21,179 15,140 10,018 13,200 18,199 Peak flow (ft Return period (years) Exceedance probability 10 0.1 377 762 531 750 997 883 1,711 1,331 1,096 1,160 1,299 1,558 6,497 7,979 15,060 15,173 15,124 10,772 10,010 13,042 5 0.2 511 875 743 779 288 381 932 491 600 558 1,176 1,088 5,301 7,855 6,227 7,837 9,568 11,100 11,185 11,148 2.33 0.4292 488 430 447 198 290 236 567 695 645 277 301 292 7,259 7,317 7,290 3,933 5,057 4,323 5,570 6,215 2 0.5 421 358 377 181 239 204 497 586 550 240 250 247 6,523 6,616 6,571 3,636 4,523 3,935 5,109 5,593
) 2 3.99 3.99 3.99 2.02 2.02 2.02 9.18 9.18 9.18 3.54 3.54 3.54 547 547 547 288 288 288 412 412 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 tham, Va. tham, Va. tham, Va. at Gretna, Va. at Gretna, Va. at Gretna, Va. Va. Va. Va. Airy, Va. Airy, Va. Airy, Va. Halifax, Va. Halifax, Va. Halifax, Va. Va. Va. Va. Va. Va. Bearskin Creek at Route 57 near Cha Bearskin Creek at Route 57 near Cha Bearskin Creek at Route 57 near Cha Whitethorn Creek tributary at Route 29 Whitethorn Creek tributary at Route 29 Whitethorn Creek tributary at Route 29 Creek at Route 40 near Gretna, Georges Creek at Route 40 near Gretna, Georges Creek at Route 40 near Gretna, Georges Blacks Creek at Route 40 near Mount Blacks Creek at Route 40 near Mount Blacks Creek at Route 40 near Mount Banister River at Route 360 (Business) Banister River at Route 360 (Business) Banister River at Route 360 (Business) Hyco River at Route 501 near Denniston, Hyco River at Route 501 near Denniston, Hyco River at Route 501 near Denniston, Hyco River at Route 738 near Omega, Hyco River at Route 738 near Omega, (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02076200 02076200 02076200 02076400 02076400 02076400 02076500 02076500 02076500 02076700 02076700 02076700 02077000 02077000 02077000 02077500 02077500 02077500 02078000 02078000 Table 2. Table [mi Table 2 91 ------500 0.002 511 290 777 5,058 1,731 33,719 12,860 20,685 15,147 273,692 282,732 ------200 0.005 416 265 332 648 3,407 1,275 3,155 11,373 25,172 10,760 12,377 381,300 131,836 275,349 135,819 ------100 0.01 353 992 247 315 554 9,281 9,627 2,704 2,497 21,512 10,090 312,100 112,907 219,969 116,391 ------50 0.02 296 679 228 294 440 7,895 8,415 8,140 2,016 1,785 18,867 253,300 115,596 187,577 119,471 /s) 3 ------25 0.04 244 559 209 274 363 6,592 6,373 6,486 1,601 1,316 14,911 80,274 82,874 203,500 142,519 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 184 350 183 835 243 262 4,980 4,385 4,642 1,044 11,275 60,947 99,199 62,999 148,600 ------5 0.2 707 143 229 161 537 212 185 8,578 3,823 3,107 3,407 46,959 75,965 48,592 113,800 ------99.1 2.33 0.4292 408 125 134 286 165 112 112 5,832 2,561 1,917 2,203 79,890 32,797 54,845 33,989 ------2 0.5 90.3 95.4 339 101 128 241 153 5,299 2,298 1,667 1,954 73,330 30,989 51,610 32,150
) 4.7 2 3.64 3.64 3.64 0.47 0.47 0.47 2.29 2.29 2.29 53.5 53.5 53.5 412 (mi area 7,393 7,393 7,393 7,866 7,866 7,866 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. ville, Va. ville, Va. ville, Va. B u g g s I s l a n d , Va . B u g g s I s l a n d , Va . B u g g s I s l a n d , Va . Va. Va. Va. Boydton, Va. Boydton, Va. Boydton, Va. South Hill, Va. South Hill, Va. South Hill, Va. Dale, Va. Dale, Va. Dale, Va. Va. Hyco River at Route 738 near Omega, Roanoke River at Route 58 Clarks Roanoke River at Route 58 Clarks Roanoke River at Route 58 Clarks Roanoke River below Kerr Dam at Roanoke River below Kerr Dam at Roanoke River below Kerr Dam at Allen Creek at Route 58 near Boydton, Allen Creek at Route 58 near Boydton, Allen Creek at Route 58 near Boydton, Jolly Hollow Branch at Route 92 Jolly Hollow Branch at Route 92 Jolly Hollow Branch at Route 92 Smith Creek tributary at Route 1 near Smith Creek tributary at Route 1 near Smith Creek tributary at Route 1 near Trout Creek at Route 16 near Wallen Trout Creek at Route 16 near Wallen Trout Creek at Route 16 near Wallen Dale, Trout Mill Creek at Route 16 near (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 02078000 02079000 02079000 02079000 02079500 02079500 02079500 02079640 02079640 02079640 02079660 02079660 02079660 02079720 02079720 02079720 03162700 03162700 03162700 03162800 Table 2. Table [mi 92 Peak-Flow Characteristics of Virginia Streams ------500 0.002 750 12,640 155,000 150,500 ------200 0.005 604 910 4,810 1,083 2,019 4,962 11,988 10,100 16,734 111,742 120,600 120,446 120,551 116,000 132,931 120,200 ------100 0.01 847 505 778 3,824 8,423 1,590 4,058 92,051 98,780 99,305 98,965 13,494 10,061 94,450 98,705 109,721 ------50 0.02 581 415 629 1,117 2,780 6,932 8,188 3,302 75,695 79,980 81,901 80,735 10,300 76,250 90,842 80,827 /s) 3 ------25 0.04 418 333 816 507 2,069 5,607 7,881 6,579 2,598 60,407 63,790 65,469 64,531 60,840 72,775 65,109 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 511 257 237 360 1,330 4,073 5,264 4,682 1,798 46,111 42,768 45,740 46,458 43,980 51,800 47,342 ------5 0.2 869 159 172 323 252 3,048 3,596 3,368 1,273 38,112 31,272 34,140 34,062 34,095 33,320 35,689 ------79.8 2.33 0.4292 473 106 168 762 143 2,004 2,093 2,063 20,194 22,720 22,085 22,313 22,990 24,845 24,035 ------2 0.5 66.2 92.4 401 141 664 122 1,796 1,812 1,807 17,998 20,500 19,707 19,983 21,000 22,203 21,693
) 4.7 4.7 2 0.37 0.37 0.37 1.07 1.07 1.07 11.2 11.2 39.4 39.4 39.4 (mi area 1,004 1,004 1,004 1,141 1,141 1,141 1,350 1,350 1,350 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. I n d e p e n d e n c e , Va . I n d e p e n d e n c e , Va . I n d e p e n d e n c e , Va . Baywood, Va. Baywood, Va. Baywood, Va. Va. Va. Va. Galax, Va. Galax, Va. Galax, Va. Springs, Va. Springs, Va. Mill Creek at Route 16 near Trout Dale, Trout Mill Creek at Route 16 near Dale, Trout Mill Creek at Route 16 near Saddle Creek tributary at Route 58 near Saddle Creek tributary at Route 58 near Saddle Creek tributary at Route 58 near New River above Kings Branch near New River above Kings Branch near New River above Kings Branch near N e w R i v N e e r w a R t i v N R e e o r w u t a R e t i Chestnut Creek above Route 89 at Galax, v 9 R e 4 o r u n t a e e t a r 9 R 4 o G u a n t Chestnut Creek above Route 89 at Galax, l e e a a x r 9 , 4 G Va a n l e . a a x r , G Chestnut Creek above Route 89 at Galax, Va a l . a x , Va . Mill Creek tributary at Route 58 Mill Creek tributary at Route 58 Mill Creek tributary at Route 58 N e w R i v e N r e w a t R i I v v e a N r n e h w a o t e R , i I v v Cripple Creek at Route 749 Cedar Va e a r . n h a o t e , I v Va a . n h o e , Cripple Creek at Route 749 Cedar Va . (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03162800 03162800 03162810 03162810 03162810 03163000 03163000 03163000 03164000 03164000 03164000 03165000 03165000 03165000 03165200 03165200 03165200 03165500 03165500 03165500 03165700 03165700 Table 2. Table [mi Table 2 93 ------500 0.002 460 1,826 11,860 10,700 22,090 26,030 ------200 0.005 373 552 2,557 8,296 7,955 3,786 4,635 1,521 1,483 11,195 22,363 18,160 32,901 21,796 22,240 51,393 26,420 ------100 0.01 314 477 2,063 6,784 9,669 5,723 3,079 3,559 1,194 1,254 18,842 15,500 27,935 19,072 19,570 41,968 23,391 ------50 0.02 260 830 391 1,659 5,495 8,364 3,996 2,493 2,736 1,050 15,761 13,080 23,533 16,585 17,060 33,476 20,434 /s) 3 ------25 0.04 211 602 866 321 1,282 4,396 7,187 2,682 1,947 2,051 12,904 10,870 19,465 14,229 14,680 26,259 17,566 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 865 153 373 651 233 3,182 9,458 5,686 1,448 1,334 1,348 8,240 11,163 11,710 14,479 18,153 13,801 ------5 0.2 114 597 814 935 921 234 504 167 7,112 2,407 4,487 6,412 8,797 9,529 11,056 12,910 10,870 ------72.7 97.7 2.33 0.4292 343 342 550 522 120 351 1,650 4,654 2,971 4,466 7,403 5,966 7,065 7,990 7,509 ------2 0.5 64.5 99.8 83.9 297 271 478 447 320 1,503 4,139 2,633 4,066 6,618 5,339 6,534 7,037 6,784
) 2 3.73 3.73 3.73 7.15 7.15 7.15 0.66 0.66 0.66 4.47 11.2 136 136 136 258 258 258 267 267 267 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Springs, Va. Va. Va. Va. Va. Va. Va. Forge, Va. Forge, Va. Forge, Va. Forge, Va. Forge, Va. Forge, Va. Dugspur, Va. Dugspur, Va. Dugspur, Va. n e a r A l l i s o n i a , Va . n e a r A l l i s o n i a , Va . n e a r A l l i s o n i a , Va . Hillsville, Va. Cripple Creek at Route 749 Cedar Sugar Run at Route 684 near Speedwell, Sugar Run at Route 684 near Speedwell, Sugar Run at Route 684 near Speedwell, Cripple Creek at Route 94 near Ivanhoe, Cripple Creek at Route 94 near Ivanhoe, Cripple Creek at Route 94 near Ivanhoe, Glade Creek at Route 629 Grahams Glade Creek at Route 629 Grahams Glade Creek at Route 629 Grahams Reed Creek at Route 619 Grahams Reed Creek at Route 619 Grahams Reed Creek at Route 619 Grahams Mira Fork tributary at Route 221 near Mira Fork tributary at Route 221 near Mira Fork tributary at Route 221 near Big Reed Island Creek below Route 693 Big Reed Island Creek below Route 693 Big Reed Island Creek below Route 693 Beaverdam Creek at Route 1009 (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03165700 03165800 03165800 03165800 03166000 03166000 03166000 03166800 03166800 03166800 03167000 03167000 03167000 03167300 03167300 03167300 03167500 03167500 03167500 03167700 Table 2. Table [mi 94 Peak-Flow Characteristics of Virginia Streams ------500 0.002 9,932 7,473 1,359 2,140 201,700 -- -- 200 0.005 806 948 4,670 2,028 8,310 9,530 4,290 2,940 2,443 1,454 2,364 3,872 1,195 1,638 13,762 163,700 177,575 167,460 -- -- 100 0.01 636 712 937 3,712 1,749 7,194 8,331 2,746 2,379 1,927 1,069 1,865 2,625 1,247 11,484 138,400 147,047 141,054 -- -- 50 0.02 501 526 771 709 912 2,695 1,455 6,162 9,522 7,217 1,707 1,917 1,364 1,318 1,781 115,700 123,137 118,276 /s) 3 -- -- 25 0.04 375 380 544 966 538 668 2,005 1,204 5,206 7,696 6,134 1,021 1,488 1,000 1,196 95,260 99,282 96,850 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 894 242 475 237 630 325 607 690 360 425 1,288 4,039 5,537 4,722 1,009 71,300 71,298 71,299 -- -- 5 0.2 840 659 160 239 700 156 402 206 387 426 248 281 3,208 4,084 3,653 54,990 53,005 53,921 -- -- 85.7 90.2 87.6 2.33 110 0.4292 456 409 406 210 202 200 142 154 2,300 2,596 2,453 37,960 35,103 36,233 -- -- 2 0.5 72.9 70.2 75.8 93.5 387 358 351 177 170 161 122 131 2,109 2,294 2,203 34,500 31,510 32,659
) 4.7 4.7 4.7 1.4 1.4 1.4 2 4.47 4.47 0.55 0.55 0.55 1.48 1.48 1.48 60.8 60.8 60.8 (mi area 2,212 2,212 2,212 Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Hillsville, Va. Hillsville, Va. Va. Va. Va. Va. Va. Va. Pulaski, Va. Pulaski, Va. Pulaski, Va. Dublin, Va. Dublin, Va. Dublin, Va. 8 near Floyd, Va. 8 near Floyd, Va. 8 near Floyd, Va. Va. Va. Va. Beaverdam Creek at Route 1009 Beaverdam Creek at Route 1009 Allisonia, New River along Route 653 at Allisonia, New River along Route 653 at Allisonia, New River along Route 653 at at Pulaski, Peak Creek below Route 11 at Pulaski, Peak Creek below Route 11 at Pulaski, Peak Creek below Route 11 Peak Creek tributary at Route 636 near Peak Creek tributary at Route 636 near Peak Creek tributary at Route 636 near near Thorne Springs Branch at Route 11 near Thorne Springs Branch at Route 11 near Thorne Springs Branch at Route 11 Fork Dodd Creek tributary at Route West Fork Dodd Creek tributary at Route West Fork Dodd Creek tributary at Route West Fork, Terrys Brush Creek at Route 615 Fork, Terrys Brush Creek at Route 615 Fork, Terrys Brush Creek at Route 615 (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03167700 03167700 03168000 03168000 03168000 03168500 03168500 03168500 03168600 03168600 03168600 03168750 03168750 03168750 03169200 03169200 03169200 03169350 03169350 03169350 Table 2. Table [mi Table 2 95 ------500 0.002 8,995 1,031 1,340 33,530 299,900 301,100 -- -- 200 0.005 782 655 916 8,099 1,277 1,172 7,557 2,058 49,448 28,350 55,990 35,337 230,100 202,486 221,622 223,500 210,694 219,452 -- 100 0.01 619 515 744 7,427 9,751 1,017 1,053 6,231 1,951 40,363 24,670 45,766 30,830 186,600 167,923 180,238 176,900 174,809 176,174 -- 50 0.02 478 807 939 404 596 5,111 6,756 9,041 1,845 32,146 21,180 36,628 26,417 149,800 141,344 146,614 138,600 147,369 141,938 /s) 3 -- 25 0.04 356 613 830 301 462 6,082 8,303 4,065 1,714 25,194 17,850 28,786 22,156 118,600 114,294 116,782 107,300 119,271 112,368 Peak flow (ft Return period (years) Exceedance probability -- 10 0.1 224 403 691 193 310 5,168 7,204 2,859 1,473 80,115 17,397 13,670 19,953 16,677 84,490 82,410 83,463 74,330 86,103 -- 5 0.2 143 270 587 126 209 4,437 6,188 2,059 1,208 12,354 10,620 14,233 12,609 63,000 61,555 62,199 54,390 64,405 59,896 -- 71.0 66.8 2.33 0.4292 149 466 110 110 820 3,525 7,631 4,733 7,233 8,851 8,239 1,263 42,260 41,059 41,521 35,920 43,053 40,263 -- 2 0.5 58.5 91.8 56.7 128 439 733 3,313 6,716 4,369 6,516 7,805 7,333 1,107 38,280 36,930 37,435 32,490 38,748 36,366
) 2 1.18 1.18 1.18 0.39 0.39 22.5 22.5 22.5 250 250 250 309 309 309 (mi area 2,767 2,767 2,767 2,961 2,961 2,961 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Valley, Va. Valley, Va. Valley, Va. (Graysonton), Va. (Graysonton), Va. (Graysonton), Va. Va. Va. Va. C h r i s t i a n s b u rg , Va . C h r i s t i a n s b u rg , Va . C h r i s t i a n s b u rg , Va . Va. Va. Va. broke, Va. broke, Va. broke, Va. 4 2 a t P o i n t P l e a s a4 n 2 t , a t Va . P o i n t P l e a s a n t , Va . Little River at Route 787 near Copper Little River at Route 787 near Copper Little River at Route 787 near Copper Little River at Route 693 Graysontown Little River at Route 693 Graysontown Little River at Route 693 Graysontown at Radford, New River below Route 11 at Radford, New River below Route 11 at Radford, New River below Route 11 near Crab Creek tributary at Route 11 near Crab Creek tributary at Route 11 near Crab Creek tributary at Route 11 New River at Route 730 Eggleston, New River at Route 730 Eggleston, New River at Route 730 Eggleston, Little Stony Creek at Route 460 Pem Little Stony Creek at Route 460 Pem Little Stony Creek at Route 460 Pem Helveys Mill Creek tributary 1 at Route Helveys Mill Creek tributary 1 at Route (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03169500 03169500 03169500 03170000 03170000 03170000 03171000 03171000 03171000 03171150 03171150 03171150 03171500 03171500 03171500 03171600 03171600 03171600 03171800 03171800 Table 2. Table [mi 96 Peak-Flow Characteristics of Virginia Streams ------500 0.002 1,990 31,770 30,650 19,370 323,500 ------200 0.005 1,703 2,932 1,771 25,850 34,191 28,129 26,000 35,961 28,488 17,290 30,132 20,384 10,643 244,400 243,245 244,044 ------100 0.01 1,611 1,363 2,372 8,836 21,890 29,053 24,148 22,720 30,587 25,024 15,680 25,539 18,514 196,000 202,142 198,090 ------50 0.02 1,088 1,912 1,454 7,292 18,340 24,492 20,582 19,630 25,809 21,753 14,040 21,480 16,587 155,600 171,375 161,503 /s) 3 ------25 0.04 832 1,484 1,300 5,854 15,140 20,279 17,301 16,710 21,398 18,594 12,370 17,726 14,542 121,900 139,142 129,102 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 553 1,006 1,097 4,171 11,380 11,578 15,106 13,234 13,050 15,971 14,460 10,060 13,141 85,670 93,081 100,893 ------5 0.2 375 698 939 8,805 8,199 9,178 3,045 11,553 11,365 10,293 10,380 12,239 10,000 63,290 75,857 70,149 ------2.33 0.4292 210 405 747 6,113 7,754 6,996 7,386 8,239 7,837 5,903 6,661 6,316 1,906 42,120 51,108 47,558 ------2 0.5 181 350 704 5,565 6,935 6,286 6,747 7,373 7,071 5,381 5,947 5,683 1,678 38,110 46,098 43,025
) 1.9 1.9 1.9 2 0.39 4.68 4.68 4.68 39.7 39.7 275 275 275 299 299 299 223 223 223 (mi area 3,783 3,783 3,783 Drainage - - - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 4 2 a t P o i n t P l e a s aville, n t , Va. Va . ville, Va. ville, Va. Va. Va. Va. n e a r G r a t t o n , Va . n e a r G r a t t o n , Va . n e a r G r a t t o n , Va . B r a n c h n e a r B l u eB fi r a e n l c d h , Va n e . a r B l u eB fi r a e n l c d h , Va n e . a r B l u eVa. fi e l d , Va . Va. Va. f a l l a t B l u e fi e l d , Vaf . a l l a t B l u e fi e l d , Va . Helveys Mill Creek tributary 1 at Route Creek at Route 660 Staffords Walker Creek at Route 660 Staffords Walker Creek at Route 660 Staffords Walker Creek below Route 100 at Bane, Walker Creek below Route 100 at Bane, Walker Creek below Route 100 at Bane, Walker Reservoir, Tazewell Cox Branch above Reservoir, Tazewell Cox Branch above Reservoir, Tazewell Cox Branch above Fork Cove Creek below Oneida West Fork Cove Creek below Oneida West Fork Cove Creek below Oneida West Creek at Route 724 near Narrows, Wolf Creek at Route 724 near Narrows, Wolf Creek at Route 724 near Narrows, Wolf N e w R i N v e e w r R a i t N v e e R w r o u R a t Bluestone River above wastewater out i t e v e R 4 r o 6 u 0 a t t e a t R 4 o 6 G u 0 l Bluestone River above wastewater out t e e a n t 4 L 6 y G 0 n l , e a n t V a L . y G n l , e n V a L . y n , V a . (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03171800 03172500 03172500 03172500 03173000 03173000 03173000 03175100 03175100 03175100 03175140 03175140 03175140 03175500 03175500 03175500 03176500 03176500 03176500 03177700 03177700 Table 2. Table [mi Table 2 97 ------500 0.002 2,274 5,546 3,639 3,481 15,240 15,151 15,187 45,260 54,090 81,160 60,468 10,725 48,181 71,805 ------200 0.005 2,336 2,022 2,812 8,248 8,906 2,085 1,171 2,839 5,141 11,371 11,320 39,190 47,058 43,239 63,750 54,812 58,183 ------100 0.01 906 2,200 1,835 9,452 2,651 8,851 6,730 7,128 1,639 2,403 4,142 34,660 40,255 37,826 52,310 47,082 48,854 ------50 0.02 646 2,068 1,650 7,810 2,493 6,754 5,197 5,442 1,196 2,006 3,137 30,190 33,404 32,194 42,210 39,316 40,172 /s) 3 ------25 0.04 939 503 1,927 1,466 6,280 2,315 4,992 4,154 4,264 1,643 2,492 25,770 27,303 26,820 33,320 32,197 32,478 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 633 333 2,011 3,117 1,211 1,693 1,221 4,486 2,925 2,944 1,729 19,960 20,302 20,222 23,190 24,056 23,894 ------5 0.2 445 231 913 2,115 1,439 1,029 3,284 1,683 1,997 2,124 1,241 15,520 15,380 15,404 16,590 18,292 18,049 ------2.33 0.4292 795 262 133 600 757 1,043 2,064 1,183 1,014 1,318 1,300 11,942 10,400 10,181 10,210 10,090 12,177 ------2 0.5 114 948 741 844 226 537 661 1,819 1,064 1,158 1,139 9,292 9,145 9,165 8,838 10,960 10,718
) 2 2.82 2.82 2.82 1.24 1.24 1.24 39.7 44.3 44.3 44.3 20 20 20 10.2 10.2 239 239 239 297 297 297 (mi area Drainage - - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 f a l l a t B l u e fi e l d , VaMills, . Va. Mills, Va. Mills, Va. Vansant, Va. Vansant, Va. Vansant, Va. Grundy, Va. Grundy, Va. Grundy, Va. Rock, Va. Rock, Va. Rock, Va. cil, Va. cil, Va. cil, Va. Va. Va. Va. Bluestone River above wastewater out Bluestone River at Route 717 Falls Bluestone River at Route 717 Falls Bluestone River at Route 717 Falls Big Prater (Prater) Creek at Route 620 Big Prater (Prater) Creek at Route 620 Big Prater (Prater) Creek at Route 620 Levisa Fork along Route 460 near Levisa Fork along Route 460 near Levisa Fork along Route 460 near Levisa Fork below Route 645 at Big Levisa Fork below Route 645 at Big Levisa Fork below Route 645 at Big Grissom Creek at Route 626 near Coun Grissom Creek at Route 626 near Coun Grissom Creek at Route 626 near Coun Barton Fork above mouth near Council, Barton Fork above mouth near Council, Barton Fork above mouth near Council, R u s s e l R l u s F s o e r l k l a F t o r R k o u a t t e R 8 o 0 u t a e t 8 C 0 o u a n t c i C l o , u n V a c . i l , V a . (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03177700 03177710 03177710 03177710 03207400 03207400 03207400 03207500 03207500 03207500 03207800 03207800 03207800 03208034 03208034 03208034 03208036 03208036 03208036 03208040 03208040 Table 2. Table [mi 98 Peak-Flow Characteristics of Virginia Streams ------500 0.002 8,076 5,081 69,230 32,341 45,738 74,510 59,308 68,421 50,370 14,557 20,686 26,891 30,931 23,280 11,860 11,860 35,310 ------200 0.005 3,868 7,808 7,091 32,110 50,520 23,280 28,923 63,080 53,379 57,432 12,630 18,084 21,902 18,010 11,950 11,950 16,691 ------100 0.01 3,274 6,363 6,375 39,040 19,539 23,126 54,810 45,818 49,155 22,380 10,426 15,075 18,352 14,630 11,783 11,783 10,932 ------50 0.02 2,647 4,902 8,194 5,679 8,042 9,729 11,710 29,530 15,749 17,925 46,870 38,219 40,981 15,250 12,024 14,755 /s) 3 ------25 0.04 2,178 3,915 6,585 9,708 4,999 9,181 5,588 8,609 11,942 21,720 12,757 13,949 39,230 31,288 33,395 10,090 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 4,112 1,586 9,279 9,708 5,472 2,752 4,699 7,006 8,670 6,367 3,353 6,997 13,570 29,540 23,357 24,556 ------5 0.2 6,911 1,173 8,793 7,056 3,175 1,996 3,448 5,186 3,432 6,448 4,568 2,211 2,211 5,612 22,440 17,749 18,425 ------2.33 0.4292 733 4,625 4,457 4,468 1,473 1,236 2,174 3,313 2,624 4,149 2,825 1,274 3,837 11,804 12,110 14,570 ------2 0.5 642 1,211 3,900 3,968 3,963 1,085 1,920 2,940 2,443 3,690 2,493 1,106 3,439 12,930 10,621 10,878
) 2 10.2 87.7 87.7 87.7 18.5 18.5 18.5 36.7 36.7 36.7 61.2 61.2 61.2 80.4 80.4 80.4 66.5 286 286 286 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Va. Va. Va. Va. Va. Va. Pound, Va. Pound, Va. Pound, Va. Pound, Va. Pound, Va. Pound, Va. Pound, Va. Pound, Va. Pound, Va. Fork, Va. Fork, Va. Fork, Va. n e a r C l i n t w o o d , Va . R u s s e Russell Fork at Route 80 near Birchleaf, l l F o r k a t Russell Fork at Route 80 near Birchleaf, R o u t e 8 0 a t Russell Fork at Route 80 near Birchleaf, C o u n c i l , V a Russell Fork below Route 63 at Haysi, . Russell Fork below Route 63 at Haysi, Russell Fork below Route 63 at Haysi, North Fork Pound River below dam at North Fork Pound River below dam at North Fork Pound River below dam at Pound River above Indian Creek, at Pound River above Indian Creek, at Pound River above Indian Creek, at Pound River below Bold Camp Creek, at Pound River below Bold Camp Creek, at Pound River below Bold Camp Creek, at Pound River at Route 624 near Georges Pound River at Route 624 near Georges Pound River at Route 624 near Georges Cranes Nest River below railroad bridge (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03208040 03208100 03208100 03208100 03208500 03208500 03208500 03208700 03208700 03208700 03208800 03208800 03208800 03208850 03208850 03208850 03208900 03208900 03208900 03208950 Table 2. Table [mi Table 2 99 ------500 0.002 2,507 1,010 28,061 42,800 51,960 81,071 34,050 31,731 33,028 18,680 10,640 25,069 45,242 367,500 238,467 ------200 0.005 703 867 863 3,795 1,325 9,186 8,814 11,446 19,170 18,680 36,640 44,541 40,105 81,871 26,900 22,681 24,198 13,600 15,819 255,200 150,799 ------100 0.01 537 684 759 3,087 1,210 7,604 8,994 7,559 16,005 15,482 32,200 38,046 35,060 71,094 22,160 19,022 20,024 10,570 13,237 190,200 115,137 ------50 0.02 375 540 659 2,500 1,099 8,099 6,258 7,037 6,404 11,003 12,797 12,438 27,940 31,499 29,894 60,359 17,950 15,316 16,036 138,900 86,819 /s) 3 ------25 0.04 290 405 564 975 5,411 1,953 6,093 5,004 5,339 8,926 10,340 10,015 23,850 25,727 25,005 98,800 49,685 14,220 12,402 12,817 64,329 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 189 262 443 785 7,475 7,242 9,932 9,013 9,168 1,338 4,016 3,546 3,693 4,050 6,457 18,630 19,097 18,962 59,330 37,592 42,857 ------5 0.2 129 173 354 937 610 7,112 5,541 5,386 6,709 6,759 2,786 2,573 2,633 3,143 4,789 14,740 14,449 14,512 37,480 28,863 30,571 ------73.3 93.4 2.33 0.4292 253 552 389 3,548 3,459 9,545 9,673 4,318 4,322 4,322 1,680 1,597 1,621 2,167 3,069 10,320 19,420 19,503 19,488 ------2 0.5 62.4 79.6 231 479 342 3,151 3,069 9,373 8,568 8,700 3,779 3,847 3,840 1,479 1,403 1,426 1,964 2,717 16,380 17,643 17,421
) 0.6 0.6 0.6 2 0.62 0.62 0.62 7.18 7.18 7.18 66.5 66.5 84.5 84.5 84.5 31.1 31.1 31.1 76.6 76.6 221 221 221 526 526 526 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 n e a r C l i n t w o o d , Va . n e a r C l i n t w o o d , Va . S u g a r G r o v e , Va . S u g a r G r o v e , Va . S u g a r G r o v e , Va . Grove, Va. Grove, Va. Grove, Va. at Teas, Va. at Teas, Va. at Teas, Va. 6 4 5 a t R i v e r6 s 4 i 5 d e a , t n R e i a v r e r C s h i i d l e h , o w n i e e a , r Va C . h i l h o w i e , Va . Cranes Nest River below railroad bridge Cranes Nest River below railroad bridge P o u n d R i P v o e u r n d n e R a i P r v o e u H r n a d y n s e R i a i , R r v u e Va H r s a . s y n e s e i l a , R r l u Va H s F a . s o y e s r i l k , R l u Va a s F t . s o e r R l k o K l u e a r t F t s e o h a r R 6 w k o K 1 u e 1 B a r t r t s e a a h n t a R c 6 w h o K 1 B u e 1 a B n r t r r e s e a a t a h n t r l a c 6 i w h 1 H K B c 1 u n a B k n r o r r e , l a a x t a e n t r l V y c a C , i h r H . K B c Va u e n a k n r e o r . e , l k x t a e r l V y a a C , i t r H . K c Va u e n k r R e o . , l o k x e u V y t a a C Slemp Creek tributary at Route 16 near , e t r . Va e 6 R e . 9 o k 7 u t a a e t t 6 R K 9 o e 7 u Slemp Creek tributary at Route 16 near l t s a e a t , 6 K 9 Va e 7 l . s a a t , K Slemp Creek tributary at Route 16 near Va e l . s a , Va . Dickey Creek at Route 16 Sugar Dickey Creek at Route 16 Sugar Dickey Creek at Route 16 Sugar South Fork Holston River at Route 601 South Fork Holston River at Route 601 South Fork Holston River at Route 601 South Fork Holston River above Route South Fork Holston River above Route (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03208950 03208950 03209000 03209000 03209000 03209200 03209200 03209200 03213577 03213577 03213577 03213590 03213590 03213590 03470900 03470900 03470900 03471100 03471100 03471100 03471200 03471200 03471200 03471500 03471500 Table 2. Table [mi 100 Peak-Flow Characteristics of Virginia Streams ------500 0.002 782 8,627 1,127 26,880 22,630 ------200 0.005 929 661 888 7,395 8,547 3,865 1,637 5,479 4,133 10,665 18,364 13,040 22,960 36,250 25,776 18,320 ------100 0.01 793 578 809 9,312 6,519 7,584 3,145 1,467 4,489 3,367 15,413 10,870 20,190 30,838 22,865 15,420 ------50 0.02 665 503 739 8,062 5,685 9,004 6,659 2,548 1,306 3,660 2,731 12,846 17,570 26,025 20,095 12,800 /s) 3 ------25 0.04 547 433 668 6,846 4,889 7,267 5,727 1,991 1,129 2,887 2,138 10,463 15,090 21,582 17,392 10,420 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 404 874 350 566 7,611 5,259 3,880 5,218 4,465 1,365 2,005 1,469 7,622 11,970 16,112 13,772 ------5 0.2 303 957 657 290 467 4,049 5,679 3,133 3,840 3,480 9,682 1,426 1,033 5,713 12,351 10,974 ------2.33 611 0.4292 196 564 396 858 226 325 2,665 3,672 2,281 2,433 2,357 7,087 8,319 7,686 3,734 ------2 0.5 174 490 342 749 212 532 294 2,371 3,258 2,096 2,149 2,122 6,528 7,446 6,965 3,337
) 7.4 7.4 7.4 2 8.27 8.27 8.27 76.6 98.1 98.1 98.1 55.6 55.6 55.6 13.2 13.2 13.2 303 303 303 132 (mi area Drainage Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 6 4 5 a t R i v e rC s r e i e d k e n , e a r n e C a h i r l hC C o r w h e i i e e k , l h n Va e o . a w r i C e h , i l h VaC o r w . e i e e k , n Va e . a r C h i l ha o t w i D a e m , a s Va c u . s , Va . a t D a m a s c u s , Va . a t D a m a s c u s , Va . 5 8 n e a r D a m a s c u s , 5 Va 8 . n e a r D a m a s c u s , 5 Va 8 . n e a r D a m a s c u s , a Va t . G r o s e c l o s e , Va . a t G r o s e c l o s e , Va . a t G r o s e c l o s e , Va . n e a r G r o s e c l o s e , Va .n e a r G r o s e c l o s e , Va .n e a r G r o s e c l o s e , Va .Va. Va. Va. a t S e v e n M i l e F o r d , Va . South Fork Holston River above Route South Fork Holston River above Grosses South Fork Holston River above Grosses South Fork Holston River above Grosses Beaverdam Creek above railroad bridge Beaverdam Creek above railroad bridge Beaverdam Creek above railroad bridge South Fork Holston River above Route South Fork Holston River above Route South Fork Holston River above Route Middle Fork Holston River at Route 679 Middle Fork Holston River at Route 679 Middle Fork Holston River at Route 679 Middle Fork Holston River at Route 11 Middle Fork Holston River at Route 11 Middle Fork Holston River at Route 11 Staley Creek at Route 688 near Marion, Staley Creek at Route 688 near Marion, Staley Creek at Route 688 near Marion, Middle Fork Holston River at Route 11 (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03471500 03472000 03472000 03472000 03472500 03472500 03472500 03473000 03473000 03473000 03473500 03473500 03473500 03473600 03473600 03473600 03473800 03473800 03473800 03474000 Table 2. Table [mi Table 2 101 ------500 0.002 130 739 2,989 3,879 25,440 18,370 200 0.005 112 625 994 357 4,112 3,110 2,169 2,867 3,999 3,618 2,427 2,142 21,964 19,642 20,230 24,009 21,371 15,630 28,725 18,885 100 0.01 100 543 888 355 1,681 3,350 2,352 2,576 3,256 2,999 1,956 1,722 18,499 16,686 16,830 20,257 18,013 13,670 24,324 16,784 50 88.6 0.02 465 785 353 1,286 2,717 1,929 2,084 2,639 2,458 1,571 1,380 11,810 15,470 14,041 13,850 16,967 15,081 20,440 14,776 /s) 3 25 77.8 0.04 967 390 670 343 2,127 1,552 1,634 2,064 1,945 1,213 1,062 11,591 11,230 12,659 13,918 12,442 10,040 16,846 12,782 Peak flow (ft Return period (years) Exceedance probability 10 0.1 64.3 638 817 296 712 507 306 1,112 9,272 8,609 8,233 9,285 1,461 1,103 1,417 1,347 7,801 10,229 12,466 10,062 5 0.2 54.4 444 803 749 995 947 562 227 487 374 250 6,967 6,513 6,249 7,714 7,084 1,027 6,153 9,468 7,916 43.2 2.33 0.4292 270 607 476 404 587 549 322 151 277 224 158 4,554 4,252 4,239 5,069 4,709 4,299 6,289 5,355 2 0.5 40.7 511 238 528 412 340 473 278 135 239 194 138 5,611 4,049 3,778 3,840 4,512 4,213 3,903 4,789
) 8.2 8.2 8.2 2 7.83 7.83 7.83 3.42 3.42 3.42 2.78 2.78 2.78 132 132 153 153 153 206 206 206 (mi area Drainage ------Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 a t S e v e n M i l e F o r da , t Va S e . v e n M i l e F o r dat , Chilhowie, Va . Va. at Chilhowie, Va. at Chilhowie, Va. howie, Va. howie, Va. howie, Va. Spring, Va. Spring, Va. Spring, Va. n e a r M e a d o w v i e w, Van . e a r M e a d o w v i e w, Van . e a r M e a d o w v i e w, Vaowview, . Va. owview, Va. owview, Va. Va. Va. Va. Middle Fork Holston River at Route 11 Middle Fork Holston River at Route 11 Middle Fork Holston River at Route 11 Middle Fork Holston River at Route 762 Middle Fork Holston River at Route 762 Middle Fork Holston River at Route 762 near Chil Hutton Creek at Route 11 near Chil Hutton Creek at Route 11 near Chil Hutton Creek at Route 11 near Glade Hall Creek at Route 11 near Glade Hall Creek at Route 11 near Glade Hall Creek at Route 11 Middle Fork Holston River at Route 803 Middle Fork Holston River at Route 803 Middle Fork Holston River at Route 803 near Mead Cedar Creek at Route 11 near Mead Cedar Creek at Route 11 near Mead Cedar Creek at Route 11 Abingdon, near Spring Creek at Route 11 Abingdon, near Spring Creek at Route 11 Abingdon, near Spring Creek at Route 11 (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03474000 03474000 03474500 03474500 03474500 03474700 03474700 03474700 03474800 03474800 03474800 03475000 03475000 03475000 03475600 03475600 03475600 03475700 03475700 03475700 Table 2. Table [mi 102 Peak-Flow Characteristics of Virginia Streams ------500 0.002 609 1,946 3,862 1,459 1,571 26,770 ------200 0.005 548 967 5,603 1,642 8,417 3,435 8,207 3,944 1,272 2,790 1,534 1,280 3,928 1,807 2,723 22,800 29,969 24,592 -- -- 100 0.01 501 940 4,593 1,431 6,955 2,284 3,122 6,779 3,612 1,137 2,255 1,375 1,085 3,197 1,588 2,200 19,990 25,398 21,578 -- -- 50 0.02 454 913 909 3,746 1,234 5,715 2,091 2,816 5,568 3,281 1,005 1,816 1,217 2,591 1,389 1,771 17,320 21,359 18,714 /s) 3 -- -- 25 0.04 405 871 877 750 2,956 1,050 4,559 1,887 2,515 4,439 2,928 1,407 1,048 2,025 1,188 1,371 14,780 17,624 15,930 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 811 338 774 824 710 953 563 916 927 2,116 2,056 3,219 1,572 3,131 2,410 1,389 11,590 13,062 12,307 -- -- 5 0.2 282 645 661 583 659 620 434 975 694 641 1,463 2,329 1,267 1,806 2,263 1,963 9,243 9,938 9,615 -- -- 2.33 0.4292 213 881 430 480 839 434 381 407 299 575 435 370 1,437 1,430 1,395 1,417 6,595 6,617 6,607 -- -- 2 0.5 197 770 379 441 742 401 330 365 271 500 382 320 1,262 1,345 1,224 1,301 6,027 5,908 5,964
) 7.6 7.6 7.6 2 4.31 4.31 4.31 4.14 4.14 4.14 13.7 13.7 13.7 26.9 26.9 26.9 25.8 25.8 25.8 221 221 221 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 n e a r Wa l l a c e , Va . n e a r Wa l l a c e , Va . n e a r Wa l l a c e , Va . Bristol, Va. Bristol, Va. Bristol, Va. tham Hill, Va. tham Hill, Va. tham Hill, Va. C h a t h a m H i l l , Va . C h a t h a m H i l l , Va . C h a t h a m H i l l , Va . Hill, Va. Hill, Va. Hill, Va. 9 1 n e a r S a l t v i l l e , 9Va 1 . n e a r S a l t v i l l e , 9Va 1 . n e a r S a l t v i l l e , Va . Beaver Creek below Lake Beaver Creek below Lake Beaver Creek below Lake Beaver Creek at Route 1405 (near) Beaver Creek at Route 1405 (near) Beaver Creek at Route 1405 (near) Lick Creek above Route 42 near Cha Lick Creek above Route 42 near Cha Lick Creek above Route 42 near Cha Possum Jaw Creek at Route 42 near Possum Jaw Creek at Route 42 near Possum Jaw Creek at Route 42 near Sprouts Creek at Route 42 near Chatham Sprouts Creek at Route 42 near Chatham Sprouts Creek at Route 42 near Chatham North Fork Holston River along Route North Fork Holston River along Route North Fork Holston River along Route B r u m l e y B r C u r m e l e e k y B r n C u e r m a e l r e e k y H a n C n e r s a e o r e n k v H i a n l n e l s a e o r , n v H Va i a l n . l s e o , n v Va i l . l e , Va . (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03477500 03477500 03477500 03478400 03478400 03478400 03487800 03487800 03487800 03487850 03487850 03487850 03487900 03487900 03487900 03488000 03488000 03488000 03488445 03488445 03488445 Table 2. Table [mi Table 2 103 ------500 0.002 2,486 2,341 2,950 6,804 50,850 38,630 -- -- 200 0.005 850 2,150 7,332 2,771 2,146 6,427 2,787 2,652 6,628 3,084 5,972 7,322 11,027 41,960 42,924 42,221 33,000 48,617 36,372 -- -- 100 0.01 671 1,911 6,042 2,526 1,989 5,283 2,608 2,429 5,451 2,843 5,348 9,161 6,558 35,950 36,638 36,165 29,030 41,601 32,239 -- -- 50 0.02 529 2,411 1,682 4,953 2,289 1,824 4,320 2,205 4,460 2,597 4,725 7,565 5,792 30,480 31,015 30,674 25,280 35,296 28,310 /s) 3 -- -- 25 0.04 397 1,464 3,937 2,041 1,648 3,421 2,171 1,981 3,535 2,326 4,102 6,078 4,976 25,500 25,836 25,641 21,720 29,499 24,505 Peak flow (ft Return period (years) Exceedance probability -- -- 10 0.1 257 1,185 2,765 1,673 1,394 2,391 1,779 1,677 2,474 1,915 3,269 4,337 3,837 19,550 19,413 19,482 17,250 22,271 19,446 -- -- 5 0.2 977 169 1,711 1,989 1,344 1,177 1,416 1,433 1,772 1,554 2,619 3,171 2,942 15,400 14,982 15,173 13,970 17,273 15,572 -- -- 91.2 2.33 0.4292 737 920 892 961 1,110 1,218 1,039 1,130 1,078 1,844 1,989 1,930 11,839 11,022 10,970 10,192 10,549 10,250 -- -- 2 0.5 77.7 685 828 824 909 863 944 1,067 9,143 9,570 9,448 1,060 1,016 1,672 1,752 1,719 10,050 10,638 10,013
) 0.6 0.6 0.6 2 21.4 21.4 21.4 17.2 17.2 17.2 18.1 18.1 18.1 42.1 42.1 42.1 401 401 401 493 493 493 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Gap, Va. Gap, Va. Gap, Va. Holston, Va. Holston, Va. Holston, Va. at Mendota, Va. at Mendota, Va. at Mendota, Va. Va. Va. Va. Va. Va. Va. l i n w o o d , n e a r l H i a n n w s o o o n d v , i l n l e e a , r Val H . i a n n w s o o o n d v , i l n l e e a , r Va H . a n s o n v i l l e , Va . Brumley Creek at Route 611 at Brumley Brumley Creek at Route 611 at Brumley Brumley Creek at Route 611 at Brumley Brumley Creek at Route 611 North Fork Holston River at Route 19 North Fork Holston River at Route 19 North Fork Holston River at Route 19 North Fork Holston River at Route 615 North Fork Holston River at Route 615 North Fork Holston River at Route 615 Fleenor Branch at Route 58 near Bristol, Fleenor Branch at Route 58 near Bristol, Fleenor Branch at Route 58 near Bristol, Cove Creek at Route 58 near Shelleys, Cove Creek at Route 58 near Shelleys, Cove Creek at Route 58 near Shelleys, C o v e C C r o e v e e k C a C r t o e v e R e k o u Big Moccasin Creek at Route 612 Col C a t r t e e e R 8 k o 0 u 3 a t t e n e R 8 a o 0 r Big Moccasin Creek at Route 612 Col u 3 t H e n i e l 8 a t 0 r o 3 n H , n i e l V a a t Big Moccasin Creek at Route 612 Col . r o n H , i l V a t . o n , V a . (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03488450 03488450 03488450 03488500 03488500 03488500 03489500 03489500 03489500 03489700 03489700 03489700 03489800 03489800 03489800 03489850 03489850 03489850 03489870 03489870 03489870 Table 2. Table [mi 104 Peak-Flow Characteristics of Virginia Streams ------500 0.002 929 8,366 6,924 11,660 53,810 ------200 0.005 822 7,276 8,601 6,201 7,327 5,701 1,003 16,190 46,760 58,548 49,378 21,151 10,370 22,462 12,558 18,801 12,466 ------100 0.01 745 935 6,494 7,777 9,402 5,650 6,691 4,675 11,498 13,554 41,660 50,285 43,927 17,801 18,927 15,787 10,382 ------50 0.02 672 872 5,744 6,976 8,430 5,092 8,592 6,035 3,814 11,271 36,740 42,808 38,633 14,876 15,834 10,413 13,164 /s) 3 ------25 0.04 603 808 5,020 9,149 6,153 7,451 9,246 4,524 6,927 5,315 3,012 31,970 35,955 33,440 12,161 12,965 10,728 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 514 712 7,811 4,092 6,624 4,987 8,895 6,130 9,504 7,515 3,745 4,965 4,255 2,095 25,810 27,338 26,498 ------5 0.2 447 614 3,116 3,392 4,917 4,012 6,674 5,081 7,148 6,041 5,833 3,648 3,369 1,492 21,150 21,361 21,255 ------2.33 0.4292 368 900 464 2,576 3,156 2,820 4,352 3,795 4,679 4,213 3,778 2,334 2,305 2,320 15,700 14,804 15,253 ------2 0.5 351 786 428 2,396 2,795 2,560 3,868 3,502 4,161 3,808 3,352 2,154 2,034 2,096 14,500 13,335 13,931
) 2 79.6 79.6 79.6 51.6 51.6 51.6 14.1 14.1 14.1 671 671 671 124 124 124 137 137 137 102 102 102 (mi area Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Gate City, Va. Gate City, Va. Gate City, Va. n e a r G a t e C i t y, Va . n e a r G a t e C i t y, Va . n e a r G a t e C i t y, Va . Bluff, Va. Bluff, Va. Bluff, Va. lands, Va. lands, Va. lands, Va. n e a r L e b a n o n , Va . n e a r L e b a n o n , Va . n e a r L e b a n o n , Va . C o u l w o o d , Va . C o u l w o o d , Va . C o u l w o o d , Va . Big Moccasin Creek at Route 71 near Big Moccasin Creek at Route 71 near Big Moccasin Creek at Route 71 near North Fork Holston River at Route 23 North Fork Holston River at Route 23 North Fork Holston River at Route 23 Clinch River at Route 631 Cedar Clinch River at Route 631 Cedar Clinch River at Route 631 Cedar Clinch River along Route 707 at Rich Clinch River along Route 707 at Rich Clinch River along Route 707 at Rich L i t t l e L R i i t v t e l r e L a R i t i t v t R e l o r e Big Cedar (Cedar) Creek above Route 19 u t a R e t i v 1 R e 9 o r u a t a t e t W 1 R Big Cedar (Cedar) Creek above Route 19 a 9 o r u d a t e t e l l W 1 , a 9 r Va d a e . t l l Big Cedar (Cedar) Creek above Route 19 W , a r Va d e . l l , Va . Thompson Creek at Route 646 near Thompson Creek at Route 646 near Thompson Creek at Route 646 near (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03489900 03489900 03489900 03490000 03490000 03490000 03521000 03521000 03521000 03521500 03521500 03521500 03522000 03522000 03522000 03523000 03523000 03523000 03523500 03523500 03523500 Table 2. Table [mi Table 2 105 ------500 0.002 290 22,110 43,020 20,900 32,247 23,439 34,594 19,250 18,907 19,144 22,032 13,420 96,190 22,081 ------200 0.005 254 916 350 11,168 11,070 37,090 50,958 40,504 15,950 23,187 18,774 25,527 15,400 13,168 17,800 13,768 15,393 73,888 19,242 12,704 80,420 ------100 0.01 228 724 319 9,189 9,484 11,392 11,065 32,810 43,645 35,945 12,900 19,459 15,732 21,478 12,860 10,745 14,850 12,628 63,754 16,165 69,580 ------50 0.02 204 572 288 7,185 8,437 8,985 9,963 8,052 9,579 28,680 37,062 31,533 10,340 15,681 12,930 17,378 10,610 12,190 54,506 13,485 59,580 /s) 3 ------25 0.04 180 430 253 8,198 8,610 5,765 6,642 9,807 7,229 7,885 6,751 8,171 24,700 31,014 27,218 12,701 10,653 14,093 46,063 10,996 50,340 Peak flow (ft Return period (years) Exceedance probability ------10 0.1 149 279 200 5,878 9,237 8,029 6,298 4,098 4,597 7,026 5,172 5,517 5,203 8,014 6,364 19,580 23,457 21,440 10,280 35,336 39,080 ------5 0.2 126 185 153 4,428 6,879 6,191 7,674 4,752 2,998 3,293 5,157 3,804 3,990 4,129 5,990 4,989 15,730 18,227 17,045 27,867 31,080 ------99.0 99.9 99.5 2.33 0.4292 3,041 4,436 4,134 4,966 3,173 1,882 2,043 3,256 2,406 2,495 2,984 3,885 3,406 11,300 11,944 12,528 19,583 22,350 ------2 0.5 93.0 85.2 89.1 2,776 3,949 3,697 4,426 2,859 1,659 1,808 2,881 2,127 2,206 2,747 3,448 3,069 11,264 10,330 10,809 17,694 20,520
) 2 0.68 0.68 0.68 87.2 87.2 87.2 30.8 30.8 30.8 41.5 41.5 41.5 533 533 533 100 100 100 987 987 987 106 106 106 (mi area 1,123 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 land, Va. land, Va. land, Va. B l a c k m o r e , Va . B l a c k m o r e , Va . B l a c k m o r e , Va . ( A l t e r n a t e ) ( n A e l a t r e r D n i a c t k e e ) n s( n o A e n l a v t r i e l r D l n i e a c , t k e e Va ) n . s City, n o e n a vVa. r i l D l i e c , k e Va n . s City, o n vVa. i l l e , Va . City, Va. Ferry, Va. Clinch River above Route 661 at Cleve Clinch River above Route 661 at Cleve Clinch River above Route 661 at Cleve G u e s t G R u i e v s e t r G R a u i t e v s e R t r o u G R a t u i t e e v s e R 7 t r o 2 u R G i a t a u v t e t e e s r R 7 C t o 2 o n u R e e G i t a b a u v e r t u e e r s r M 7 C n t i 2 o , n l R e e l S i a b V a e t a v r t u r o e . r n r M Ya C n y i o , n r l e e d C l S b V a , r e t a r u e r o . Va e r n M Ya k n . y i , r l a d C l S t V , r e t a e r o . R Va e n o Ya k . y u r t Stony Creek above Route 66 at Fort a d C e t , r e 6 R Va e 1 o k . 9 u t a a e t t 6 R K 1 o a 9 u Stony Creek above Route 66 at Fort , t a e Va t . 6 K 1 a 9 , a Va t . K a Stony Creek above Route 66 at Fort , Va . C l i n c h C R l i i v n e c r h a C R t l i i v C n e l c r i h n Copper Creek tributary 1 at Route 58 a c R t h i p v C o e l r r i t n , a c Va t h p . C o l r i t Copper Creek tributary 1 at Route 58 n , c Va h p . o r t , Va . Copper Creek tributary 1 at Route 58 Copper Creek at Route 619 near Gate Copper Creek at Route 619 near Gate Copper Creek at Route 619 near Gate Clinch River below Route 58 at Speers (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03524000 03524000 03524000 03524500 03524500 03524500 03524550 03524550 03524550 03524900 03524900 03524900 03525000 03525000 03525000 03525500 03525500 03525500 03525800 03525800 03525800 03526000 03526000 03526000 03527000 Table 2. Table [mi 106 Peak-Flow Characteristics of Virginia Streams ------500 0.002 897 7,249 29,520 36,665 31,307 25,700 29,062 26,546 50,250 59,732 51,831 62,450 62,726 62,519 200 0.005 883 893 7,678 6,443 7,171 20,111 79,869 80,271 23,900 27,641 25,495 10,643 20,380 20,263 42,960 53,902 46,188 50,600 57,632 53,421 100 0.01 871 883 6,333 5,842 8,836 6,478 69,021 69,405 20,170 23,307 21,655 16,950 16,813 16,884 37,860 46,280 40,713 42,760 49,572 45,793 50 0.02 859 871 5,195 5,247 7,292 5,779 59,093 59,404 16,840 18,920 17,944 13,940 13,470 13,686 33,080 38,619 35,265 35,770 41,480 38,620 /s) 3 25 0.04 845 859 4,135 4,654 5,854 5,037 11,320 11,061 50,043 50,216 13,870 15,359 14,755 10,890 28,560 31,620 29,975 29,520 33,992 32,035 Peak flow (ft Return period (years) Exceedance probability 10 0.1 823 838 2,909 3,859 4,171 3,986 8,339 7,885 8,023 11,232 38,504 38,795 10,390 10,970 22,930 23,612 23,320 22,230 25,437 24,341 5 0.2 803 816 8,311 2,097 8,027 8,400 3,233 3,045 3,145 6,376 5,852 5,974 30,459 30,746 18,810 17,947 18,237 17,280 19,365 18,814 2.33 0.4292 773 779 1,287 5,574 5,452 5,474 2,469 1,906 2,197 4,396 3,754 3,866 11,940 21,504 21,900 14,160 12,512 12,140 12,916 12,758 2 0.5 765 769 1,129 5,077 4,864 4,902 2,295 1,678 2,002 4,003 3,335 3,451 11,359 11,100 11,632 11,524 19,450 19,963 13,160 10,744
) 2 23.1 23.1 23.1 39.7 39.7 39.7 71.2 71.2 71.2 112 112 112 290 290 290 319 319 319 (mi area 1,123 1,123 Drainage - - - Station description /s, cubic foot per second; p, Log-Pearson Type III; r, regional regression; w, weighted value; --, not determined] regional regression; w, III; r, Type /s, cubic foot per second; p, Log-Pearson 3 Ferry, Va. Ferry, Va. Duffield, Va. Duffield, Va. Duffield, Va. Gap, Va. Gap, Va. Gap, Va. B i g S t o n e G a p , Va . B i g S t o n e G a p , Va . B i g S t o n e G a p , Va . P e n n i n g t o n G a p , Va . P e n n i n g t o n G a p , Va . P e n n i n g t o n G a p , Va . ton Gap, Va. ton Gap, Va. ton Gap, Va. Va. Va. Va. Clinch River below Route 58 at Speers Clinch River below Route 58 at Speers North Fork Clinch River at Route 58 North Fork Clinch River at Route 58 North Fork Clinch River at Route 58 Powell River at Route 23 Big Stone Powell River at Route 23 Big Stone Powell River at Route 23 Big Stone South Fork Powell River at Route 23 South Fork Powell River at Route 23 South Fork Powell River at Route 23 North Fork Powell River at Route 621 North Fork Powell River at Route 621 North Fork Powell River at Route 621 Powell River at Route 421 near Penning Powell River at Route 421 near Penning Powell River at Route 421 near Penning Powell River at Route 70 near Jonesville, Powell River at Route 70 near Jonesville, Powell River at Route 70 near Jonesville, (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) (p) (r) (w) Peak-flow characteristics of streamgaging stations in Virginia.—Continued
Station number , square mile; ft, foot; ft 2 03527000 03527000 03527500 03527500 03527500 03529500 03529500 03529500 03530000 03530000 03530000 03530500 03530500 03530500 03531000 03531000 03531000 03531500 03531500 03531500 Table 2. Table [mi Manuscript approved on August 22, 2011.
Prepared by: USGS Science Publishing Network Raleigh Publishing Service Center 3916 Sunset Ridge Road Raleigh, NC 27607
For additional information regarding this publication, contact: Samuel H. Austin, Hydrologist USGS Virginia Water Science Center 1730 East Parham Road Richmond, Virginia 23228 phone: 804-261-2600 e-mail: [email protected]
Or visit the Virginia Water Science Center Web site at: http://va.water.usgs.gov
A PDF version of this publication is available online at http://pubs.usgs.gov/sir/2011/5144/ Austin and others—Peak-Flow Characteristics of Virginia Streams—Scientific Investigations Report 2011–5144 Printed on recycled paper