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Hydrography of the Santee River during moderate discharge conditions

To harness hydroelectric power, most of the flow of the Santee River, SC was diverted in 1942 into Charleston Harbor, where shoaling promptly became a major problem. For this reason, most of the diverted flow is scheduled to be rediverted to the Santee within the next decade, increasing the mean discharge of the Santee from 74 to 428 m3s−1. To assess the present hydrogrpahy of the Santee estuary under conditions of moderate discharge, we determined 226 vertical profiles of velocity, salinity, and temperature distributed over 17 stations in February, 1975. We found that 73 and 27% of the discharge reached the ocean via the North and South distributaries, respectively. The 1 ppt isohaline was found no further than 8 km upstream from the mouth, indicating the limited extent of the estuarine zone. The Santee is a partially mixed estuary classified as type 2b. The circulation parameter is approximately 3 and the stratification parameter approximately 0.3. The bulk parameters indicate the importance of tidal, mixing and a weakly developed gravitational circulation. When rediversion is completed, the net salinity in the lower Santee River can be expected to decrease drastically, which in turn is likely to terminate the lucrative oyster and clam fishery.