By 1995, the water table may fall by as much as 5 metres (16 feet) in east-central Nassau County and as much as 1.8 metres (6 feet) in central Suffolk County as a result of proposed sewerage programs. similar, but generally slightly less, change may occur in the potentiometric head in the Magothy aquifer. Streamflow may decrease by as much as 55 percent in streams draining from Nassau County Sewage Disposal District 3 and as much as 56 percent in streams draining from the Huntington-Northport Sewer District.
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USGS Numbered Series
Analog-model analysis of effect of wastewater management on the ground-water reservoir in Nassau and Suffolk Counties, New York: Report I: Proposed and current sewerage