Water-Table and Potentiometric-Surface Altitudes of the Upper
Glacial, Magothy, and Lloyd Aquifers on Long Island, New York, in March-April 2000, with a
Summary of Hydrogeologic Conditions
by Ronald Busciolano
U.S. GEOLOGICAL SURVEY
Water-Resources Investigations Report 01-4165
ABSTRACT
The three main water-bearing units on
Long Island, New York--the upper glacial
aquifer (water table) and the underlying
Magothy and Lloyd aquifers--are the sole
source of water supply for more than 3 million
people. Water-table and potentiometric-surface
altitudes were contoured from water-level
measurements made at 394 observation,
public-supply, and industrial-supply wells
during March-April 2000. In general, water-level
altitudes in the upper glacial, Magothy,
and Lloyd aquifers were lower throughout
most parts of Long Island than those measured
during March-April 1997. Changes in altitude
during this period ranged from an increase of
about 6 feet in the Magothy aquifer in
southwestern Nassau County to a decrease of
more than 8 feet in the upper glacial aquifer in
eastern 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 a
Summary 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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