Physical and Hydrochemical Evidence of Surface-water/Ground-water Mixing in and near Lake Seminole, Southwestern Georgia and Northwestern Florida
Water resources of the Lake Seminole area in the lower Apalachicola-Chattahoochee-Flint River Basin emanate from an interconnected aquifer-stream-reservoir system that is centered around a constructed lake in a karst hydrogeologic setting. Ground water enters stream channels and the lake bottom by diffuse leakage and springflow; this water contains dissolved minerals from carbonate formations of the Upper Floridan aquifer. Water samples from wells adjacent to Lake Seminole contain higher concentrations of calcium and magnesium, and higher alkalinity, and specific conductance than surface-water samples, which contain relatively high concentrations of total organic carbon and sulfate. Each of the four impoundment arms of Lake Seminole has a distinct water chemistry that can be attributed in part to the hydrodynamic connection of the lake bottom with the ground-water flow regime Water chemistry and incremental discharge measurements in the Spring Creek impoundment arm indicate predominant ground-water discharge from the Upper Floridan aquifer into the lake. Chemical analyses and physical properties of water sampled from the dam pool and Apalachicola River indicate upwelling of lake water in the river downstream of Jim Woodruff Lock and Dam.
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