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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 # <br />Amount <br />Run -off Vol A -F <br />Disturbed 26.41 87 <br />1.8 <br />0.75 1.66 <br />Coal Mine Waste 23.43 90 <br />1.8 <br />0.93 1.81 <br />Mixed Shrub 132.61 57 <br />1.8 <br />0.01 0.12 <br />Dry Mixed Shrub 199.16 57 <br />1.8 <br />0.01 0.18 <br />Juniper Woodlanc 2.48 61 <br />1.8 <br />0.04 0.01 <br />Prev. Disturbed 0.60 74 <br />1.8 <br />0.26 0.01 <br />TOTAL 384.69 <br />3.78 <br />TOTAL REQUIRED WATER VOLUME - - A -F <br />3.78 <br />SEDIMENT VOLUME - Pond F <br />Use the universal soil loss equation. <br />A= RKLSCP <br />R = rainfall factor <br />30.00 <br />K = soil erodibility factor <br />0.37 <br />LS = combined length slope factor 900'- <br />2% <br />0.39 <br />Use Ditch F7 Length & Slope <br />C = cropping management factor <br />1.00 <br />P = erosion control practice factor <br />1.00 <br />A = sediment, tons /acre /year <br />4.33 <br />Two Year Sediment Volume - Acre -Feet <br />0.18 <br />52.92 ACRES -115#/CF <br />Mixed Shrub and Dry Mixed Shrub not included. <br />Total Required Sediment Pond Capacity - Acre -Feet <br />3.97 <br />TR -72 App. B-4 05/12 <br />