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The Floridan aquifer system consists of limestone, dolomite, and calcareous sand; and is one of the most productive ground-water reservoirs in the United States. Regionally, the Floridan aquifer system has been divided into the Upper and the Lower Floridan aquifers (Miller, 1986). In Georgia, about 655 million gallons of water per day is pumped from the Upper Floridan aquifer, mostly for agricultural and industrial use (Pierce and Kunde 1,1990). A potentiometric surface shows the level to which water would rise in tightly-cased wells that fully penetrate an aquifer. This report shows the potentiometric surface of the Upper Floridan aquifer in Georgia, and adjacent parts of Alabama, Florida, and South Carolina. The Upper Floridan underlies most of the Coastal Plain physiographic province in Georgia. The Upper Floridan is confined, except where rocks comprising the aquifer crop out at land surface. In some areas, the potentiometric surface is hijgh enough to produce flowing wells. Water-level and water-pressure measurements in more than 1,070 wells in Georgia and adjacent parts of Alabama, South Carolina, and Florida during May 9 to June 3,1990, were used to construct the potentiometric surface of the Upper Floridan aquifer (fig. 1). The potentiometric surface was mapped by determining the altitude of water levels in a network of wells (fig. 1), and is shown on the map by contours that connect points of equal altitude. Maps showing the potentiometric surface of the Upper Floridan aquifer in Georgia, and adjacent states of Alabama, Florida, and South Carolina, are prepared periodically by the U.S. Geological Survey, in cooperation with the Georgia Department of Natural Resources, Environmental Protection Division, Georgia Geologic Survey; Chatham County; Glynn County; the cities of Brunswick and Valdosta; and the Albany Water, Gas, and Light Commission. These maps are published in an annual report entitled, "Ground-Water Conditions in Georgia, 19XX." REFERENCES Clarke, J.S., 1987, Potentiometric surface of the Upper Floridan aquifer in Georgia, May 1985, and water-level trends, 1980-85: Georgia Geologic Survey Hydrologic Atlas 16, 1 sheet, scale 1:1,000,000. Miller, JA., 1986, Hydrogeologic framework of the Floridan aquifer system in Florida and parts of Georgia, South Carolina, and Alabama: U.S. Geological Survey Professional Paper 1403- B,91p. Pierce, R.R. and Kundell, J.E., 1990, Georgia water supply and use; in Carr, J.E., Chase, E.B., Paulson, R.W., and Moody, D.W., ed, ; National Water Summary, 1987, Hydrologic events and water supply and use: U.S. Geological Survey Water-Supply Paper 2350, p. 215-222.

Potentiometric surface of the upper Floridan aquifer, in Georgia, and adjacent parts of Alabama, Florida, and South Carolina, May-June 1990