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Water-Year Summary for Site 02029000

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Available Parameters
00060 Discharge(Mean)  

Water year 2021: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2021
LOCATION - Lat 37°47'50", long 78°29'30" referenced to North American Datum of 1927, Albemarle County, VA, Hydrologic Unit 02080203, on left bank 900 ft downstream from bridge on State Highway 20 at Scottsville, 6.8 mi upstream from Hardware River, and at mile 188.6.
DRAINAGE AREA - 4,581 mi².
REVISIONS HISTORY - WSP 727: 1931(m). WSP 972: 1936(M), 1940(M). OFR 2006-1308: Drainage area.
PERIOD OF RECORD - October 1924 to current year. Monthly discharge only for some periods, published in WSP 1303.
GAGE - Water-stage recorder. Datum of gage is 252.47 ft NAVD of 1988. Prior to Nov. 28, 1928, nonrecording gage at present site and datum.
REMARKS - Large diurnal fluctuation caused by powerplants upstream from station. Flow regulated since December 1979 by Lake Moomaw (station 02011795) 197.5 mi upstream; since October 1984 by Back Creek Lake 225.5 mi upstream; and since January 1985 by Little Back Creek Lake 228.6 mi upstream, amount unknown. Statistics of monthly mean data and summary statistics for water years 1925 - 1979 (unregulated flow) are available in previous data books, water years 1991 - 1998. Maximum discharge, 301,000 ft³/s, from rating curve extended above 120,000 ft³/s on basis of slope-conveyance study. Water-quality records for some prior periods have been collected at this location.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in October 1870 reached a stage of 30.7 ft, discharge, about 215,000 ft³/s, and flood in November 1877 reached a stage of 27.9 ft, discharge, about 160,000 ft³/s, from information by local resident. Flood in March 1913 reached a stage of 25.16 ft, from floodmarks, discharge, about 121,000 ft³/s.
EXTREMES FOR PERIOD PRIOR TO REGULATION - 1925-79: Maximum peak flow, 301,000 ft³/s, June 22, 1972, gage height, 34.02 ft, from floodmarks. Instantaneous low flow, 302 ft³/s, Oct. 1, 1930, probably lower during period of doubtful record in September 1966.