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I <br />L J <br />RUN -OFF VOLUME - - Pond C <br />TOTAL <br />309.48 <br />REQUIRED WATER VOLUME 10 -YEAR EVENT - - A -F <br />REQUIRED WATER VOLUME MINE DISCHARGE <br />TOTAL REQUIRED WATER VOLUME <br />SEDIMENT VOLUME - Pond C <br />The Topographic Factor LS is difficult to evaluate for a steep mountainous drainage <br />area. According to the LS factor table, when the length of slope exceeds 400 feet and <br />or percent slope exceeds 24 percent, soil loss estimates are speculative as these <br />values are beyond the range of research data. Therefore, an LS factor using 400 feet <br />and 24 percent will be used for this calculation. <br />3.23 <br />3.23 <br />0.22 <br />3.45 <br />Calcufate Weighted Average C- Factor <br />Precip <br />Direct <br />Run-off <br />Area <br />Acres <br />Curve # <br />Amount <br />Run -off <br />Vol A -F <br />1 Disturbed <br />34.47 <br />87.6 <br />1.8 <br />0.78 <br />2.25 <br />2 Previously Disturbed <br />2.02 <br />74 <br />1.8 <br />0.26 <br />0,04 <br />3 Rockfall <br />11.70 <br />89 <br />1.8 <br />0.86 <br />0.84 <br />4 Rockfall Trans. <br />7.10 <br />63 <br />1.8 <br />0.06 <br />0.04 <br />5 Mountain Shrub <br />224.33 <br />41 <br />1.8 <br />0.00 <br />0.00 <br />6 Dry Mountain Shrub <br />17.90 <br />57 <br />1.8 <br />0.01 <br />0.02 <br />7 Juniper Woodland <br />11.96 <br />61 <br />1.8 <br />0.04 <br />0.04 <br />8 Wetland <br />0.00 <br />89 <br />1.8 <br />0.86 <br />0.00 <br />9 Upper Meadow <br />0.00 <br />74 <br />1.8 <br />0.26 <br />0.00 <br />TOTAL <br />309.48 <br />REQUIRED WATER VOLUME 10 -YEAR EVENT - - A -F <br />REQUIRED WATER VOLUME MINE DISCHARGE <br />TOTAL REQUIRED WATER VOLUME <br />SEDIMENT VOLUME - Pond C <br />The Topographic Factor LS is difficult to evaluate for a steep mountainous drainage <br />area. According to the LS factor table, when the length of slope exceeds 400 feet and <br />or percent slope exceeds 24 percent, soil loss estimates are speculative as these <br />values are beyond the range of research data. Therefore, an LS factor using 400 feet <br />and 24 percent will be used for this calculation. <br />3.23 <br />3.23 <br />0.22 <br />3.45 <br />Calcufate Weighted Average C- Factor <br />Area <br />Acres <br />% Canopy <br />% Cover <br />C- Factor <br />Extended <br />Disturbed' <br />34,47 <br />0.0 <br />0.0 <br />0.1800 <br />6.205 <br />Previously Disturbed <br />2.02 <br />0.0 <br />10.0 <br />0.3250 <br />0.657 <br />Rock Fall <br />18,80 <br />No sediment <br />contribution <br />Mixed Shrub <br />224,33 <br />56.9 <br />92.6 <br />0.0046 <br />1.032 <br />Dry Mixed Shrub <br />17,90 <br />20.0 <br />40.0 <br />0.1000 <br />1.790 <br />Juniper Woodland <br />11,96 <br />28.2 <br />85.2 <br />0.0104 <br />0.124 <br />Welland <br />0.00 <br />0.0 <br />50.0 <br />0.0710 <br />0.000 <br />Upper Meadow <br />0.00 <br />0.0 <br />88.4 <br />0.0074 <br />0.000 <br />TOTAL 309.48 <br />' One tone per acre mulch. <br />A= RKLSCP <br />R = rainfall factor <br />K = soil erodibility factor <br />LS = combined length slope factor 400'- 24% <br />C = cropping management factor <br />P = erosion control practice factor <br />A = sediment, tons /acre /year <br />ONE YEAR SEDIMENT VOLUME - ACRE FEET <br />�V9.4i: ACRES - 115 A/CF <br />TOTAL REQUIRED SEDIMENT POND CAPACITY -- AF <br />PR -07 EXH -8 -8 <br />Wt. Ave. 0.032 <br />30.00 <br />D.37 <br />11.20 <br />0.0317 <br />0.75 <br />2.95 <br />0.365 <br />3.817 <br />2/03 <br />