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• Cover Type - Oak-aspen-mountain brush mixture <br />Hydrologic Condition Poor <br />Soil Type - Absarokee C <br />Curve Number 74 <br />RUN-OFF VOLUME - - Pond F <br /> Precip Direct Run-off <br />Area Acres Curve # Amount Run-off Vol A-F <br />Disturbed 25.79 87 1.8 0.75 1.62 <br />Coal Mine Waste 23.04 90 1.8 0.93 1.78 <br />Mixed Shrub 132.61 57 1.8 0.01 0.12 <br />Dry Mixed Shrub 201.00 57 1.8 0.01 0.18 <br />Juniper Woodland 1.16 61 1.8 0.04 0.00 <br />Prev. Disturbed 0.60 74 1.8 0.26 0.01 <br />TOTAL 384.20 3.71 <br />TOTAL REQUIRED WATER VOLUME - - A-F 3.71 <br />SEDIMENT VOLUME - Pond F <br />• Use the universal soil loss equation. <br />A=RKLSCP <br />R = rainfall factor 30.00 <br />K = soil erodibility factor 0.37 <br />LS = combined length slope factor 900'- 2% 0.39 <br />Use Ditch F7 Length & Slope <br />C = cropping management factor 1.00 <br />P = erosion control practice factor 1.00 <br />A = sediment, tons/acre/year 4.33 <br />Two Year Sediment Volume - Acre-Feet 0.17 <br />50.59 ACRES - 115 #/CF <br />Mixed Shrub and Dry Mixed Shrub not includ ed. <br />Total Required Sediment Pond Capacity - Acre-Feet 3.89 <br />is <br />TR-61 App-B4 04/09 <br />APPRov6b <br />6 ll7/a g