USGS Water-Year Summary for Site 01478120

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00400 pH(Med.,Max.,Min.)
	63680 Turbidity, Form Neph(Mean,Max.,Min.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

01478120 EAST BRANCH WHITE CLAY CREEK AT AVONDALE, PA

LOCATION - Lat 39°49'42", long 75°46'52" referenced to North American Datum of 1927, Chester County, PA, Hydrologic Unit 02040205, at Third Street bridge in Avondale Borough, 2,000 ft upstream from State Route 41.

DRAINAGE AREA - 11.3 mi².

REVISIONS HISTORY -

Revisions: Discharge was revised for the period of August 28, 2020 to August 30, 2020 on March 31, 2021 due to additional analysis.

Prior to March 10, 2022, the datum of gage was reported as 270 ft above North American Vertical Datum of 1929.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2007 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 264.65 ft. above North American Vertical Datum of 1988, from single-base GNSS static survey. Satellite telemetry at station. Previous to March 10, 2022, the datum of gage was erroneously reported as 270 ft above National Geodetic Vertical Datum of 1929.

COOPERATION - Funding for this station is provided by the Chester County Water Resources Authority, Chester County Emergency Services, and the U.S. Geological Survey.

REMARKS - Records rated fair, except those for discharges less then 5 ft³/s, those for discharges greater than 160 ft³/s, and those for estimated discharges, which are poor.

ECOLOGICAL RECORDS

PERIOD OF RECORD - October 1970 to current year.

REMARKS - Results of benthic surveys can be obtained by contacting the U.S. Geological Survey Pennsylvania Water Science Center, Downingtown Field Office.

WATER-QUALITY RECORDS

PERIOD OF RECORD - October 1970 to current year.

PERIOD OF DAILY RECORD - Turbidity: July 2020 to current year. Water Temperature and Specific Conductance: November 2019 to current year. pH: October 2007 to October 2014.

COOPERATION - Samples were collected with cooperation from the Chester County Water Resources Authority and the Chester County Department of Emergency Services. 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 - Data sonde deployed insitu monitoring water temperature, specific conductance, and turbidity at a 15 minute interval and interfaced with with telemetry..

REMARKS -

Samples were collected as part of the Chester County Biological Monitoring project. As of October 2013, results from discrete water quality samples collected at this site are available through the U.S. Geological Survey National Water Information System web interface on the "Water Quality for the Nation" webpage. Interruptions in the record were due to malfunctions of the equipment. Records for water year 2014 pH are fair.

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, 765 microsiemens/cm, Jan 17, 2022; minimum, 59 microsiemens/cm, Aug 7, 2020. pH: Maximum, 9.1 units, Apr 1,5 and 9, 2013; minimum, 6.2 units, Aug 28, 2011, Sep 7, 2011. WATER TEMPERATURE: Maximum, 25.9°C, Aug 2, 2020; minimum, -0.1°C, first on Jan 29, 2022, several days. TURBIDITY: Maximum 642 FNU, Aug 12, 2020; minimum, <0.3 FNU, many days.