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USGS Water-Year Summary 2024
404031073382701 N 11166. 1
Northern Atlantic Coastal Plain aquifer system
Magothy Aquifer
Magothy Aquifer
LOCATION - Lat 40°40'31", long 73°38'27" referenced to North American Datum of 1927, Nassau County, NY, Hydrologic Unit 02030202, at west side of North Village Avenue, 54 ft north of Demott Avenue, Rockville Centre.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 645 ft. Upper casing diameter 4 in; top of first opening 620 ft, bottom of last opening 640 ft. Datum of gage is NGVD of 1929.
DATUM - Land-surface datum is 36 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of coupling, 0.14 ft below land-surface datum, 35.86 ft above land-surface datum, Oct. 3, 1988 to Jun. 24, 2015; Top of 4 in. steel casing, north edge, 35.67 ft above land-surface datum, Jun. 23, 2015 to Oct. 23, 2023; New MP. Removed blue riser, 35.63 ft above land-surface datum, Feb. 8, 2019 to Oct. 23, 2023; Top of 4 in. steel casing, north edge, 35.674 ft above land-surface datum, Oct. 23, 2023 to present.
PERIOD OF RECORD - March 1993 to March 1998, September 2003 to current year.
GAGE - Water-level recorder installed September 2003 to August 2024; 15-minute recording interval. Periodic manual measurements made by USGS personnel.
EXTREMES FOR PERIOD OF RECORD - Highest water level recorded, 21.01 ft above NGVD of 1929, Apr. 3, 2010; lowest recorded, 12.14 ft above NGVD of 1929, Aug. 30, 2016.
