USGS Water-Year Summary 2020
01481000 BRANDYWINE CREEK AT CHADDS FORD, PA
LOCATION - Lat 39°52'11", long 75°35'37" referenced to North American Datum of 1927, Delaware County, PA, Hydrologic Unit 02040205, on left bank 27 ft upstream from Penn Central Railroad bridge at Chadds Ford, 150 ft upstream from Harvey Run, and 1,200 ft downstream from highway bridge on U.S. Highway 1.
DRAINAGE AREA - 287 mi².
- WSP 756: Drainage area. WSP 1202: 1917-18(M), 1919-20, 1922-31(M), 1932-33, 1934(M), 1936, 1938(P), 1939(M), 1942, 1944-46(M), WDR PA-98-1: 1996-97 (M).
PERIOD OF RECORD - August 1911 to September 1953, October 1962 to current year. Prior to October 1911, monthly discharge only, published in WSP 1302.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 150.45 ft above National Geodetic Vertical Datum of 1929. Prior to May 21, 1927, non-recording gage at same site and datum. Satellite and landline telemetry at station.
COOPERATION - Station established and maintained by the U.S. Geological Survey. Funding for the operation of this station is provided by the Pennsylvania Department of Environmental Protection, Chester County Water Resources Authority, the City of Wilmington, Delaware, and the U.S. Geological Survey.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Aug. 19, 1955 reached a stage of 14.64 ft, gage datum; discharge approximately 16,400 ft³/s.
PERIOD OF RECORD - October 2005 to current year.
INSTRUMENTATION - Precipitation gage interfaced with data collection platform.
PERIOD OF RECORD - April 2002 to current year.
PERIOD OF RECORD - Water years 1963 to current year.
PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 1965 to current year.
pH: October 1965 to September 1966, December 1971 to current year.
WATER TEMPERATURES: October 1964 to current year.
DISSOLVED OXYGEN: October 1971 to current year.
TURBIDITY: October 2005 to current year.
COOPERATION - Water-quality samples were collected as part of the Pennsylvania Department of Environmental Protection Water-Quality Network (WQN) with cooperation from the Pennsylvania Department of Environmental Protection and Chester County Water Resources Authority.
INSTRUMENTATION - Water-quality monitor since August 1971.
EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 1030 microsiemens/cm (snowmelt), Mar 3, 2015; minimum, 42 microsiemens/cm, Nov 26, 1979.
pH: Maximum, 9.8, Apr 9, 1975; minimum, 6.1, Feb 22, 1976.
WATER TEMPERATURE: Maximum, 31.2°C, Jul 23, 2011; minimum, -0.1°C, many days during winter periods.
DISSOLVED OXYGEN: Maximum, 17.1 mg/L, Dec 5, 1976; minimum, 3.0 mg/L, Jun 21, 1984.
TURBIDITY: Maximum 980 FNU, Sep 30, 2010; minimum, 0 FNU, many days.