| **Water-Table and Potentiometric-Surface Altitudes of the UpperGlacial, Magothy, and Lloyd Aquifers on Long Island, New York, in March-April 2000, with aSummary of Hydrogeologic Conditions**by Ronald BusciolanoU.S. GEOLOGICAL SURVEY    Water-Resources Investigations Report 01-4165ABSTRACT
The three main water-bearing units onLong Island, New York--the upper glacialaquifer (water table) and the underlyingMagothy and Lloyd aquifers--are the solesource of water supply for more than 3 millionpeople. Water-table and potentiometric-surfacealtitudes were contoured from water-levelmeasurements made at 394 observation,public-supply, and industrial-supply wellsduring March-April 2000. In general, water-levelaltitudes in the upper glacial, Magothy,and Lloyd aquifers were lower throughoutmost parts of Long Island than those measuredduring March-April 1997. Changes in altitudeduring this period ranged from an increase ofabout 6 feet in the Magothy aquifer insouthwestern Nassau County to a decrease ofmore than 8 feet in the upper glacial aquifer ineastern Suffolk County. 

Citation: Busciolano, R., 2002, Water-Table and Potentiometric-Surface Altitudes of the Upper Glacial, Magothy, and Lloyd Aquifers on Long Island, New York, in March-April 2000, with aSummary of Hydrogeologic Conditions:U.S. Geological Survey Water-Resources Investigations Report 01-4165, 17 p., 6 plates

      [Full Report, Acrobat PDF    (1.3M)]

      [Plate 1a, Altitude of the water table in upper glacial aquifer in western Long Island, N.Y., March-April 2000, orig. size 28"x28", Acrobat PDF (1.1M)]
      [Plate 1b, Altitude of the water table in upper glacial aquifer in eastern Long Island, N.Y., March-April 2000, orig. size 34.25"x28", Acrobat PDF (819K)]      [Plate 2a, Altitude of the potentiometric surface in Magothy aquifer in western Long Island, N.Y., March-April 2000, orig. size 28"x28", Acrobat PDF (1.1M)]      [Plate 2b, Altitude of the potentiometric surface in Magothy aquifer in eastern Long Island, N.Y., March-April 2000, orig. size 34.25"x28", Acrobat PDF (796K)]      [Plate 3a, Altitude of the potentiometric surface in Lloyd aquifer in western Long Island, N.Y., March-April 2000, orig. size 28"x28", Acrobat PDF (1.1M)]      [Plate 3b, Altitude of the potentiometric surface in Lloyd aquifer in eastern Long Island, N.Y., March-April 2000, orig. size 34.25"x28", Acrobat PDF (783K)]
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