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• Reservoir Sediment Volume: <br />Use Universal Soil Loss Equation (U.S.L.E.) with an <br />appropriate Sediment Delivery Ratio. <br />Ys = R•K•LS•CP ~~ _ (L'.S.L.E,) x (nR) <br />Yg = Sediment Yield (tons/acre/yr.) <br />R = Rainfall Factor <br />K = Soil Erodibility Factor <br />L$ = Length Slope Factor <br />CP = Control Practice Factor <br />~r = Sediment Delivery Ratio <br />The sediment yield method and figures used are from <br />• "Hydrology and Sedimentology of Surface Dlined Lands", by C.T. Haan <br />and B. J. Barfield, except where indicated. <br />Solution: 1) Average annual rainfall factor (R) = 16 (From <br /> ~NCHRP Project 16-3 - Erosion C ontrol during highway <br /> construction - Manual, Figure 5-2 - Iso-Erodent (r) <br /> Values) <br />2) Soil erodibility factor (K) _ ~,2~, <br /> Assume waste rock disposal sit e to h ave a low <br /> erodibility factor. <br />3) Length slope factor (LS) = g,g (From fig. 5.10 <br /> Slope-effect chart. pg. 192) - Assum e average <br /> slope length of 90 ft for the 3H;IV slope of the <br /> waste rock fill. <br />U <br /> <br />