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Asd-4 <br />Reservoir Sediment Volume: <br />• Use Universal Soil Loss Equation (LISLE) with an appropriate <br />Sediment Delivery Ratio. <br />Ys = R•K•LS•CP•Dr = (LISLE) x (Dr) <br />Ys = Sediment Yield (tons/acre/year) <br />R = Rainfall Factor <br />K = Soil Erodibility Factor <br />LS = Length Slope Factor <br />CP = Control Practice Factor <br />Dr = 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. <br />J. Barfield, except where indicated. <br />SEDIMENT YIELD <br />Area <br />• Top <br />1-1~:1 <br />Road <br />Undisturbed <br />Area <br />R K LS CP Dr <br />20 0.30 0.12 0.50 .30 <br />20 0.35 12 0.9 0.9 <br />20 0.30 1.6 1.0 0.9 <br />20 0.30 16 0.60 0.5 <br />Tn/Ac/ Tons/ <br />Yr Acres Year <br />0.11 1.26 0.14 <br />68.04 1.08 73.48 <br />8.64 0.23 1.93 <br />28.8 1.10 31.68 <br /> Ys = 107.23 tns/yr <br />Volume of Sediment Delivered is: <br /> <br />Vs = Ys (2000 lbs/ton) (i acre) <br />1.25 (62.4 lbs/ftj) (43560 ft2) <br />Substituting Ys into the preceding formula gives a sedi- <br />ment volume of 0.06 Ac-Ft. Total Sediment Volume for a <br />2.1-year period shall be 5490 cu. ft. (0.13 Ac-Ft). <br />~ i~ Pi ~..'. I u,3:j <br />