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Disturbed <br />Table 2 -2a -Runoff curve numbers for urban areas <br />Dirt - including right -of -way <br />Soil Type - Loam <br />C <br />Curve Number <br />87 <br />Coal Mine Waste <br />Table 2 -2d -Runoff curve numbers for arid and semiarid rangelands <br />Cover Type - Herbaceous - mixture of grass, weeds and brush <br />Hydrologic Condition <br />Poor <br />Soil Type <br />D <br />Curve Number <br />90 <br />RUN -OFF VOLUME - POND J <br />Precip <br />Direct <br />Run -off <br />Area Acres <br />Curve # <br />Amount <br />Run -off <br />Vol A -F <br />Pasture 4.14 <br />74 <br />1.8 <br />0.26 <br />0.09 <br />Irrigated Hayfield 9.15 <br />71 <br />1.8 <br />0.19 <br />0.15 <br />Disturbed 10.30 <br />87 <br />1.8 <br />0.75 <br />0.65 <br />Disturbed 10.40 <br />70 <br />1.8 <br />0.17 <br />0.15 <br />Coal Waste 16.02 <br />90 <br />1.8 <br />0.93 <br />1.24 <br />Disturbed 2.18 <br />81 <br />1.8 <br />0.48 <br />0.09 <br />Disturbed 0.20 <br />98 <br />1.8 <br />1.58 <br />0.03 <br />TOTAL 52.39 <br />2.38 <br />TOTAL REQUIRED WATER VOLUME - - A -F <br />2.38 <br />SEDIMENT VOLUME - Pond J <br />Use the universal soil loss equation. <br />A= RKLSCP <br />R = rainfall factor <br />30.00 <br />K = soil erodibility factor - Work soil <br />0.37 <br />LS = combined length slope factor 2000' - .5% <br />0.23 <br />C = cropping management factor - Figure 6 <br />1.00 <br />P = erosion control practice factor <br />1.00 <br />A = sediment, tons /acre /year <br />2.55 <br />THREE YEAR SEDIMENT VOLUME - ACRE FEET <br />0.160 <br />52.39 ACRES - 115 # /CF <br />TOTAL REQUIRED SEDIMENT POND CAPACITY -- AF <br />2.54 <br />TR -91 Volume XI, App. B -5 12/14 <br />