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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.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
395512075293701 DE 723
Piedmont and Blue Ridge crystalline-rock aquifers
Felsic Gneiss, Hornblende-Bearing
Felsic Gneiss, Hornblende-Bearing
LOCATION - Lat 39°55'12.3", long 75°29'35.0" referenced to North American Datum of 1983, Delaware County, PA, Hydrologic Unit 02040202, at Glen Mills School, in Thornbury Township.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 300 ft. Upper casing diameter undefined; top of first opening undefined, bottom of last opening undefined. Drilled unused observation well, casing information not available.
DATUM - Land-surface datum is 282 ft above North American Vertical Datum of 1988. Measuring point: top plywood shelf, 1.2 ft above land-surface datum, Apr. 8, 1983 to May. 11, 1984; top plywood shelf, 2.66 ft above land-surface datum, May. 11, 1984 to present. Elevation of land surface is from Lidar.
PERIOD OF RECORD - April 1983 to current year.
GAGE - Data collection platform with 5-minute recording interval. Prior to Feb 23, 2022, recording interval was 60 minutes. Satellite telemetry at station.
COOPERATION - Site maintained in cooperation with the Pennsylvania Department of Environmental Protection and the U.S. Geological Survey.
REMARKS - Daily maximum water levels are available for this well for the period of record. For some years, daily minimum and daily mean water levels may also be available from the USGS Pennsylvania Water Science Center Office.
EXTREMES FOR PERIOD OF RECORD - Prior to October 2000, the extremes were based on extremes of the daily maximum depth below land-surface datum. Since that date, the extremes are based on the instantaneous depth below land-surface datum. Highest water level, 1.50 ft below land-surface datum, Dec 15, 1996; lowest, 10.25 ft below land-surface datum, Sep 26, 2002.
