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Open-File Report 2009-1037

Prepared in cooperation with the U.S. Environmental Protection Agency

Continuous Tidal Streamflow and Gage-Height Data for Bass and Cinder Creeks on Kiawah Island, South Carolina, September 2007

By Paul A. Conrads and John W. Erbland


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A three-dimensional model of Bass and Cinder Creeks on Kiawah Island, South Carolina, was developed to evaluate methodologies for determining fecal coliform total maximum daily loads for shellfish waters. To calibrate the model, two index-velocity sites on the creeks were instrumented with continuous acoustic velocity meters and water-level sensors to compute a 21-day continuous record of tidal streamflows. In addition to monitoring tidal cycles, streamflow measurements were made at the index-velocity sites, and tidal-cycle streamflow measurements were made at the mouth of Bass Creek and on the Stono River to characterize the streamflow dynamics near the ocean boundary of the three-dimensional model at the beginning, September 6, 2007, and end, September 26, 2007, of the index-velocity meter deployment. The maximum floodtide and ebbtide measured on the Stono River by the mouth of Bass Creek for the two measurements were -155,000 and 170,000 cubic feet per second (ft3/s). At the mouth of Bass Creek, the maximum floodtide and ebbtide measurements during the 2 measurement days were +/-10,200 ft3/s. Tidal streamflows for the 21-day deployment on Bass Creek ranged from -2,510 ft3/s for an incoming tide to 4,360 ft3/s for an outgoing tide. On Cinder Creek, the incoming and outgoing tide varied from -2,180 to 2,400 ft3/s during the same period.

First posted February 24, 2009

For additional information contact:
U.S. Geological Survey
720 Gracern Road
Columbia, SC 29210

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Suggested citation:

Conrads, P.A., and Erbland, J.W., 2009, Continuous tidal streamflow and gage-height data for Bass and Cinder Creeks on Kiawah Island, South Carolina, September 2007: U.S. Geological Survey Open-File Report 2009-1037, 12 p. (available only online at




Data Collection

Continuous Velocity and Gage-Height Data

Discrete Streamflow Measurements

Computation of Continuous Streamflow Data

Estimation of Gage-Height Record for Bass Creek

Development of Stage-Area Curves

Development of Index-Velocity Ratings

Continuous Streamflow Record



References Cited

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