LOWER ACF BASIN

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Hydrogeologic Assessment and Simulation of Stream-Aquifer Relations in the Lower Apalachicola-Chattahoochee-Flint River Basin

Project Chief: Lynn Torak
Cooperators: Georgia Department of Natural Resources, Environmental Protection Division
Year started: 2000

Problem

Current hydrologic information and groundwater-flow modeling in the lower Apalachicola – Chattahoochee – Flint (ACF) River Basin (inset map) are insufficient to describe effects of time-variant irrigation pumping on streamflow. Therefore, existing models cannot accurately predict ground-water or streamflow conditions during a growing season. The Georgia Department of Natural Resources, Environmental Protection Division (GaEPD) has implemented a hydrologic assessment of the Upper Floridan aquifer in southwestern Georgia to obtain new information and to further understanding of stream-aquifer relations and the effects of groundwater pumping on streamflow in a karst hydrologic setting. The U.S. Geological Survey has engaged in a cooperative effort with GaEPD to develop a groundwater-flow model that can account for stream-aquifer interaction and streamflow reduction caused by agricultural pumping. Information obtained from the model is vital to the State’s management of ground-water resources and for providing early indication of low-streamflow conditions that would affect delivery of water to downstream, out-of-state users.

Objectives

• Develop new data for the stream-lake-aquifer system by evaluating well-drilling and aquifer-test information.
• Obtain accurate locations of pumped wells for municipal, industrial, and irrigation purposes.
• Collect and compile ground-water-level, stream-seepage, and off-stream spring-discharge data.
• Synthesize newly collected and existing hydrologic data into a transient finite-element model of ground-water flow that can simulate seasonal ground-water levels, stream-aquifer interaction, and pumpage-induced streamflow reduction, and assess the sensitivity of streamflow to ground-water pumping.

Publications

Torak, L.J., and Painter, J.A., 2006, Geohydrology of the Lower Apalachicola– Chattahoochee –Flint River Basin, southwestern Georgia, northwestern Florida, and southeastern Alabama: U.S. Geological Survey Scientific Investigations Report 2006-5070, 67 p. and interactive map, Web-only publication.