Georgia Water Science Center

USGS Water-Resources Investigations Report 02-4016

Simulated Effects of Ground-Water Pumpage on Stream– Aquifer Flow in the Vicinity of Federally Protected Species of Freshwater Mussels in the Lower Apalachicola– Chattahoochee–Flint River Basin (Subarea 4), Southeastern Alabama, Northwestern Florida, and Southwestern Georgia

This report is available online in pdf format (3 MB): USGS WRIR 02-4016 (Opens the PDF file in a new window. )

Phillip N. Albertson and Lynn J. Torak

U.S. Geological Survey Water-Resources Investigations Report 02-4016, 54 pages (Published 2002)


Picture of mussles. Simulation results indicate that ground-water withdrawal in the lower Apalachicola-Chattahoochee-Flint River basin during times of drought could reduce stream–aquifer flow and cause specific stream reaches to go dry. Of the 37 reaches that were studied, 8 reaches ranked highly sensitive to pumpage, 13 reaches ranked medium, and 16 reaches ranked low. Of the eight reaches that ranked high, seven contain at least one federally protected mussel species. Small tributary streams such as Gum, Jones, Muckalee, Spring, and Cooleewahee Creeks would go dry at lower pumping rates than needed to dry up larger streams. Other streams that were ranked high may go dry depending on the amount of upstream flow entering the reach; this condition is indicated for some reaches on Spring Creek. A dry stream condition is of particular concern to water and wildlife managers because adequate streamflow is essential for mussel survival.




Purpose and scope

Method of study

Description of the study area


River and lake system




Stream–aquifer relations

Simulation of stream–aquifer flow

Model representation of stream reaches

Sensitivity ranking procedure

Model limitations

Simulated effect of changing pumpage and boundary conditions on stream–aquifer flow

Simulated stream–aquifer flow in the vicinity of federally protected freshwater mussels

Summary and conclusions

References cited

Appendix A. Tables listing stream–aquifer flow, by reach, for simulated hydrologic and pumpage conditions

Appendix B. Graphs showing the simulated effect of pumpage on stream–aquifer flow for stream reaches



This report is available online in pdf format (3 MB): USGS WRIR 02-4016 (Opens the PDF file in a new window. )
To view the PDF document, you need the Adobe Acrobat® Reader installed on your computer. (a free copy of the Acrobat® Reader may be downloaded from Adobe Systems Incorporated.)

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