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Preconstruction and postconstruction ground-water levels, Lock and Dam 2, Red River Valley, Louisiana

Open-File Report 79-919

Prepared in cooperation with the U.S. Army Corps of Engineers and the U.S. Soil Conservation Service
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Abstract

Proposed construction of a series of locks and dams in the Red River in Louisiana will cause a permanent increase in average river stage. The potentiometric surface of the shallow alluvial aquifer and the water table in the fine-grained material confining the aquifer will be affected. The purpose of this study using digital-modeling techniques, was to predict the average postconstruction potentiometric surface (steady state) and the water table (nonsteady state) so that potential effects of the water-level changes could be evaluated. Plans for lock and dam 2 at mile 87 (kilometer 140) above the mouth of the Red River call for a pool elevation of 58 feet (17.7 meters) and will cause an average increase in river stage of 12.5 feet (3.8 meters). As a result, ground-water levels will be raised 1 foot (0.3 meter) or more within 4 miles (6.4 kilometers) of the river and will be near land surface in low areas. The potentiometric surface may be as much as 1 to 2 feet (0.3 to 0.6 meter) above land surface south of Latanier along Chatlin Lake Canal and south of the Annandale area of Alexandria. The magnitude of ground-water-level fluctuations near the river will be reduced.

Study Area

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Preconstruction and postconstruction ground-water levels, Lock and Dam 2, Red River Valley, Louisiana
Series title:
Open-File Report
Series number:
79-919
Year Published:
1979
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Baton Rouge, Louisiana
Description:
Report: iv, 18 p.; 4 Plates: 31.85 x 39.79 and smaller
Country:
United States
State:
Louisiana
Other Geospatial:
Red River Valley
Scale:
62500