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Effects of sanitary sewers on ground-water levels and streams in Nassau and Suffolk Counties, New York; Part 1, geohydrology, modeling strategy, and regional evaluation

Water-Resources Investigations Report 82-4045

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Abstract

A computer simulation of Long Island 's regional groundwater system has been used to evaluate the effects that new-installed sewers will have on ground-water levels. Results indicate maximum water-table decliners of as much as up to 18 feet in central Nassau County and about 9 feet in Suffolk County. Total stream base flows and freshwater outflow to the south shore bay system will decrease by 22%. The regional scale of the model does not permit detailed predictions for individual streams. To quantify the effects of lowered ground-water levels on individual streams, two fine-scale sub-regional models have been designed. This report, the first in a three-part series describing the simulated effects of sewers in southern Nassau and southwestern Suffolk Counties, presents the hydrogeologic setting, pertinent literature, modeling strategy, subregional model design, and the results obtained to date from the regional ground-water model. The regional model results described will be used in the later reports to generate flux boundary conditions for the subregional models. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Effects of sanitary sewers on ground-water levels and streams in Nassau and Suffolk Counties, New York; Part 1, geohydrology, modeling strategy, and regional evaluation
Series title:
Water-Resources Investigations Report
Series number:
82-4045
Edition:
-
Year Published:
1983
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
v, 45 p. :ill., maps ;28 cm.