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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

Water-Resources Investigations Report 2001-4165

Prepared in cooperation with the New York City Department of Environmental Protection
Suffolk County Department of Health Services
Suffolk County Water Authority
By:

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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.

Suggested 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 2001–4165, 17 p., https://pubs.er.usgs.gov/publication/wri014165.

Study Area

Table of Contents

  • Abstract
  • Introduction
  • Hydrogeology
  • Hydrologic conditions
  • Water-table and potentiometric-surface altitudes in March-April 2000, and changes from March-April 1997 conditions
  • Summary and conclusions
  • References cited

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
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
Series title:
Water-Resources Investigations Report
Series number:
2001-4165
Year Published:
2002
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
New York Water Science Center
Description:
Report: iv, 17 p.; 6 Plates
Country:
United States
State:
New York
Other Geospatial:
Long Island
Online Only (Y/N):
N
Additional Online Files (Y/N):
Y