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Asb-5 <br />• Reservoir Sediment Voltmme: <br />Use Universal Soil Loss Equation (USLE) with an appropriate <br />Sediment Delivery Ratio. <br />Ys = R•K•LS•CP•Dr = (USLE) 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 "Hydro- <br />logy and Sedimentology of Surface Mined Lands", by C.T.Haan <br />and B.J. Barfield, except where indicated. <br />SEDIMENT YIELD <br /> Tn/Ac/ Tons/ <br />Area R K LS CP Dr Yr Acres Year <br />• <br />Top 20 0.35 0.12 0.35 0.60 0.17 1.47 0.25 <br />2:1 20 0.35 7.0 0.73 0.80 28.62 1.80 51.51 <br />Road, 7.597 20 0.30 1.5 0.90 0.60 4.86 0.34 1.65 <br />Road, 2.57 20 0.30 0.40 0.90 0.40 0.86 0.43 0.37 <br /> To tal Tons/Year 53.78 <br /> Volume of Sediment Deli vered is: <br /> Vs = Ys (2000 lbs/ton) (1 acre) <br /> 1.25 (62. bs t ) ( 3,560 tz) <br /> Substitu ting Ys into the preceding formula <br /> gives a sedimen t volume of: 0.03 Ac-Ft/Yr <br /> Use Vs = 1,300 ft; to tal sediment volume for <br /> a 3-year period shall be 3,900 ft3 (0.10 Ac-Ft). <br /> Use 0.10 Ac-Ft <br /> <br />JAN L21~~~ <br />