Stream-Aquifer Relations in the Coastal Area of Georgia and Adjacent Parts of Florida and South Carolina
Clarke, John S.
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Stream-aquifer relations in a 31,835-square-mile area in parts of Georgia, Florida, and South Carolina were evaluated in support of ground-water modeling investigations using hydrograph-separation and a linear-regression analysis of streamflow duration curves. The study area consists of three major river systems—the Altamaha-Satilla-St Marys, Salkehatchie-Savannah-Ogeechee, and Suwannee—that interact with the underlying ground-water system to varying degrees largely based on the degree of incision of a river into an aquifer and on topography. Average mean-annual baseflow in the three basins ranged from about 42 to 69 percent of total mean-annual streamflow during 1981, 1997, and 2000. Baseflow provided a larger percentage of streamflow at sites in the Salkehatchie-Savannah-Ogeechee River Basin than in the other two basins, which probably results from their proximity to the upper Coastal Plain where there is greater topographic relief and interconnection between streams and aquifers. Linear-regression analysis of baseflow and streamflow duration indicate that the 65-percent flow duration is a reasonable estimate of mean-annual baseflow.