USGS - science for a changing world

South Atlantic Water Science Center - Georgia

 South Atlantic WSC  Georgia office  Information/data  Projects  Publications  RiverCam  Drought  Flood  About  Contact



Lower ACF basin project home page. Project home



USGS Water Science Centers are located in each state.

There is a USGS Water Science Center office in each State. Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

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


Map showing location of Air Force Plant 6, Marietta, Ga.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.


  • 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.


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.

USGS Home Water Climate Change Core Science Ecosystems Energy and Minerals Env. Health Hazards

Accessibility FOIA Privacy Policies and Notices logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information:
Page Last Modified: Friday, 03-Oct-2014 07:24:02 EDT