Preliminary Sediment Analysis for the Broad River
Radcliffe, David E.
Rasmussen, Todd C.
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Sediment Total Maximum Daily Loads (TMDLs) have been proposed for segments of the North, Middle, and South Forks of the Broad River. Our objectives are to present the sediment data that is available for the Broad River and to use HSPF to make a preliminary analysis of sediment sources. Total suspended solids (TSS) was measured at the USGS gaging station on the Broad River near Bell from 1958 to 1979 and the mean TSS concentration was a relatively high value of 75 mg/L. HSPF was used to predict TSS during the period 1971 to 1979. Land use data was from 1983. Only small adjustments to default discharge parameters were required to calibrate HSPF to the observed discharge at Bell. To calibrate the model for TSS, bed sediment parameters had to be adjusted including reducing the critical shear stresses for deposition and scouring and increasing the initial silt content and depth of bed sediments. These results may indicate that the source of the high suspended sediment levels in the Broad River is legacy sediment.