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Effects of increased pumpage on a fractured-bedrock aquifer system in central Orange County, New York

Water-Resources Investigations Report 84-4348

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Abstract

The bedrock in central Orange County consists of highly indurated siltstone, shale, and conglomerate containing two major fault systems and extensive fracturing; it is overlain by 50 to 100 feet of till. The fracturing permits unusually high well yields. Wells tapping the bedrock yield 75 to 200 gallons per minute; those tapping bedrock in adjacent areas yield only a few tens of gallons per minute. The bedrock aquifer is recharged mainly by percolation of water from precipitation through the till. In 1983, the U.S. Geological Survey studied the hydrologic effects of increased pumpage on the fractured bedrock aquifer system near the Village of Kiryas Joel, in the Town of Monroe. Water levels were measured in several wells in the village 's two well fields from February to October 1983, and pumpage data from the same period were tabulated. Water levels responded to variations in both pumpage and precipitation. Pumping tests and water levels in the southeastern well field in 1983 had no effect on the northwestern well field. An observation well between the two fields shows about 20 feet of seasonal fluctuation from recharge and the effects of pumping at the northwestern well field. Aquifer-test data indicate a transmissivity of 900 feet squared per day and a storage coefficient of 0.0001. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Effects of increased pumpage on a fractured-bedrock aquifer system in central Orange County, New York
Series title:
Water-Resources Investigations Report
Series number:
84-4348
Edition:
-
Year Published:
1985
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
v, 27 p. :ill., maps ;28 cm.