A map showing the potentiometric surface of the Magothy aquifer was drawn from water-level measurements made in March 1975. These measurements indicated a range in altitude of the potentiometric surface from more than 25 feet (7.62 metres) below mean sea level in Queens County to more than 80 feet (24.38 metres) above mean sea level in Nassau County.
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USGS Numbered Series
The potentiometric surface of the Magothy Aquifer on Long Island, New York, in March 1975