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Asa-4 <br />Allow liquid volume for 2 10-year events Vsr = 3.44 Ac-Ft <br />• Vsr = 3.50 Ac-Ft <br />Reservoir Sediment Volume: <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/ <br />Area R K LS CP Dr Yr Acres Tons/Year <br />• <br />Undisturbed 20 0.20 0.32 0.35 0.85 0.38 6.04 2.30 <br />Undisturbed 20 0.20 2.00 0.35 0.90 2.52 3.21 8.09 <br />Parking Lot 20 0.24 0.18 1.30 0.90 1.01 3.21 3.24 <br />Coal Stockpile <br />Area 20 0.37 0.21 1.30 0.80 1.62 8.82 14.29 <br />Wash Plant Site 20 0.37 0.18 1.30 0.90 1.56 3.08 4.80 <br />Office ~ Bldg. 20 0.24 0.13 1.30 1.00 0.81 1.01 0.82 <br />Bathouse Area 20 0.24 0.16 1.30 1.00 1.00 0.92 0.92 <br />Supply Yard 20 0.32 0.17 1.30 0.80 1.13 9.34 10.55 <br /> Grand Total 45.01 <br />Sediment Volume = Y = (2000 lbs/tn) 1 acre 45.01 tn/ r = 0.028 <br />s ( bs cu t) 4 ,560 <br />Ys = 0.028 Ac-Ft/Yr x 5 years = 0.138 Ac-Ft <br /> Calculated Volume = 3.64 Ac-Ft <br />• Design Volume = 5.44 Ac-Ft <br />~I~N L c i~+~~ <br />