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USGS Water-Year Summary 2024
404943073414701 N 12508. 1
Northern Atlantic Coastal Plain aquifer system
Lloyd Aquifer
Lloyd Aquifer
LOCATION - Lat 40°49'42.4", long 73°41'44.5" referenced to North American Datum of 1983, Nassau County, NY, Hydrologic Unit 02030201, at north side of Charles Street near dead end, along west side of foot path to Madison Street, at Stannards Brook Park, Port Washington.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 400 ft. Upper casing diameter 4 in; top of first opening 355 ft, bottom of last opening 375 ft. Datum of gage is NGVD of 1929.
DATUM - Land-surface datum is 61 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of north edge of 4 inch PVC casing, 60.07 ft above land-surface datum, Feb. 13, 1995 to Oct. 12, 2023; Top of north edge of 4 inch PVC casing, 60.03 ft above land-surface datum, Oct. 12, 2023 to present.
PERIOD OF RECORD - March 1995 to July 2024.
GAGE - Water-level recorder installed June 14, 2002; 15-minute recording interval. Periodic manual measurements made by USGS personnel.
REMARKS - Water level affected by tidal fluctuation and nearby pumping.
EXTREMES FOR PERIOD OF RECORD - Highest water level recorded, 12.37 ft above NGVD of 1929, Apr. 1, 2013; lowest recorded, 14.18 ft below above NGVD of 1929, July 10, 2002.
