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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
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USGS Water-Year Summary 2024
01478100 East Branch White Clay Creek tributary near London Grove, PA
LOCATION - Lat 39°51'30", long 75°47'01" referenced to North American Datum of 1927, Chester County, PA, Hydrologic Unit 02040205, on the left bank, 50 ft upstream from Spencer Road bridge, 2 miles north of Avondale Boro.
DRAINAGE AREA - 2.79 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - January 2020 to current year.
GAGE - Data collection platform recording at a 15-minute interval from a pressure transducer referenced to a series of vertical staff plates. Peaks are verified by a crest-stage gage. Satellite telemetry at station.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water Temperature and Specific Conductance, January 2020 to current year. Turbidity, July 2020 to current year.
COOPERATION - The station is maintained by the U.S. Geological Survey with funding provided by the U.S. Geological Survey Next Generation Water Observing System(NGWOS).
INSTRUMENTATION - Temperature, specific conductance, and turbidity are collected on a 15-minute interval from a water-quality sonde located 10 ft upstream from the gage and interfaced with site telemetry.
REMARKS - The reporting precision of the turbidity probe in low turbidity water is +/-0.3 FNU. The lowest reportable value, 0 FNU, is subject to this error and does not necessarily indicate a condition of zero turbidity. Turbidity values greater than 1300 FNU are beyond the specification of the sensor and are considered unreliable. Interruptions in the record were due to malfunctions of the equipment.
EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 401 microsiemens/cm, Jan 18, 2020; minimum, 35 microsiemens/cm, Aug 7, 2020. WATER TEMPERATURE: Maximum, 23.3°C, Aug 9, 2022; minimum, 0.1°C, many days. TURBIDITY: Maximum 905 FNU, Aug 7, 2020; minimum, <0.3 FNU, many days.
