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Potential effects of dredging the South Fork Obion River on ground-water levels near Sidonia, Weakley County, Tennessee

Water-Resources Investigations Report 90-4041

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Abstract

The U.S. Army Corps of Engineers has proposed dredging an approximate 7-mile reach of the South Fork Obion River near Sidonia, Tennessee. This dredging will have an effect on ground-water levels in a wetland area near the river. The river cuts into a sandy aquifer that is confined by an overlying clay layer. Ground water in the confined aquifer flows from a ridge on the north side of the study area toward the river, Estimates of aquifer transmissivity range from 3,300 to 18,800 feet squared per day. Assuming a 3-foot decline in stream stage due to dredging, the maximum decline in ground-water levels would be about 2.4 feet at low flow. Ground-water levels in the aquifer would decline by at least 2 feet at a distance of 0.5 mile from the river within 60 days after the change in stream stage, regardless of the assumed transmissivity value. Water-level declines in the upper clay layer probably would be much smaller. The time required for a specified change in ground-water level is dependent on the aquifer properties and distance from the river.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Potential effects of dredging the South Fork Obion River on ground-water levels near Sidonia, Weakley County, Tennessee
Series title:
Water-Resources Investigations Report
Series number:
90-4041
Edition:
-
Year Published:
1992
Language:
ENGLISH
Publisher:
U.S. Dept. of the Interior, U.S. Geological Survey ; Books and Open-File Reports Section [distributor],
Description:
iii, 12 p. :ill. ;28 cm.