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Development of a digital model of ground-water flow in deeply weathered crystalline rock, Chester County, Pennsylvania

Water-Resources Investigations Report 80-2

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Abstract

The model simulates recharge to, flow through, and discharge from the water-table aquifer in a 5.98 square mile basin representative of most of Chester County, Pa. The two-dimensional finite-difference model of Trescott, Pinder, and Larson was used. The way groundwater evapotranspiration varies with depth was modified, and a minimum transmissivity was added to prevent the model from ' going dry'. Tests of the model showed good correlation with field data, but also showed that additional information would make the model more reliable. Particularly helpful would be more water-level and evapotranspiration data, synoptic base-flow measurements, and information the variation of permeability and specific yield with depth. Residential development was simulated in 1 square mile of the basin using combinations of the following conditions: 1 acre, 1/2 acre, and 1/4 acre lot size; waste water disposal by septic systems or by public sewering; domestic wells or public-supply wells for water supply; and 0, 1, and 5% reduction in recharge in the developed area. Where domestic water is supplied by local groundwater, decreased lot size and reduced recharge cause increased drawdowns and reduced base flow. When waste water is exported by sewers, these effects are magnified. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Development of a digital model of ground-water flow in deeply weathered crystalline rock, Chester County, Pennsylvania
Series title:
Water-Resources Investigations Report
Series number:
80-2
Edition:
-
Year Published:
1980
Language:
ENGLISH
Publisher:
U.S. Dept. of the Interior, Geological Survey,
Description:
v, 42 p. :ill., maps ;26 cm.