Effects of Pumpage Reductions in the Savannah, Georgia–Hilton Head Island, South Carolina, Area on Saltwater Intrusion near Hilton Head Island
Payne, Dorothy F.
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Numerical simulations were used to test the effects of variable pumpage reductions on the movement of chloride plumes in the Upper Floridan aquifer at the northern end of Hilton Head Island, at Pinckney Island, and near the Colleton River, South Carolina. Several combinations of pumpage reductions in the Savannah, Georgia, and Hilton Head Island, South Carolina, areas were simulated using a previously published, variable-density, solute-transport model of the Savannah–Hilton Head Island area. Simulation results indicate that the Colleton River plume responds more to pumpage reductions in the Savannah area than does the northern Hilton Head Island plume, and that the northern Hilton Head Island plume responds more to local pumpage reductions in the Hilton Head Island area than does the Colleton River plume. The Pinckney Island plume responds to pumpage reductions at both Savannah and Hilton Head Island areas. Substantial reductions, more than 75 percent, in the Savannah and Hilton Head Island areas may be required to prevent the expansion and salinity increase of the plumes. Finally, if all pumping is eliminated, the chloride plumes may persist for the foreseeable future.