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Liquid Volume. <br />Vsr = 0.58 in X 5.0 ac. = 0.24 Ac - Ft. <br />12 in/ft <br />Reservoir Sediment Volume: <br />Use Universal Soil Loss Equation (U.S.L.E.) with an appropriate <br />Sediment Delivery Ratio. <br />YS = R K L S CP x (DR) <br />YS = Sediment Yield (tons/acre/yr). <br />R <br />K <br />LS <br />CP <br />• DR <br />Rainfall Factor <br />Soil Erodibility Factor <br />Length Slope Factor <br />Control Practice Factor <br />Sediment Delivery Ratio <br />The sediment yield method and figures used are from "Hydrology <br />and Sedimentology of Surface Mined Lands", by C. T. Haan and B. J. <br />Barfield unless specified otherwise. <br />Solution: <br />1) Average annual rainfall factor (R) = 16 (From NCHRP Project <br />16 - 3 - Erosion Control During Highway Construction - Manual, <br />Figure 5-2 Iso-Erodent (R) Values). <br />2) Soil erodibility factor (k) = 0.43 (From NCHRP Project 16-3 - <br />Erosion Control During Highway Construction - Manual, Figure <br />5 - 9 Soil Erodibility Index (K)). <br />3) Length slope factor (LS) = 36 Calculation of the length slope <br />• factor was limited to the mine office and working area. The <br />method used was the Foster and Wischmeier Method. <br />