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RUN-OFF VOLUME - -Pond C <br /> Precip Direct Run-off <br />Area Acres Curve # Amount Run-off Vol A-F <br />1 Disturbed 34.47 87.6 1.8 0.78 2.25 <br />2 Previously Disturbed 2.02 74 1.8 0.26 0.04 <br />3 Rockfall 11.70 89 1.8 0.86 0.84 <br />4 Rockfall Trans. 7.10 63 1.8 0.06 0.04 <br />5 Mountain Shrub 224.33 41 1.8 0.00 0.00 <br />6 Dry Mountain Shrub 17.90 57 1.8 0.01 0.02 <br />7 Juniper Woodland 11.96 61 1.8 0.04 0.04 <br />8 Wetland 0.00 89 1.8 0.86 0.00 <br />9 Upper Meadow 0.00 74 1.8 0.26 0.00 <br />TOTAL 309.48 3.23 <br />REQUIRED WATER VOLUME 10-YEAR EVENT - - A-F 3.23 <br />REQUIRED WATER VOLUME MINE DISCHARGE 022 <br />TOTAL REQUIRED WATER VOLUME 3.45 <br />SEDIMENT VOLUME -Pond C <br />The Topographic Factor LS is difficult to evaluate for a steep mou ntainous 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 estim ates are speculative as these <br />values are beyond the range of research data. The refore, an LS factor using 400 feet <br />and 24 percent will be used for this calculation. <br />Calculate Weighted Average C-Factor <br />Area Acres % Canopy % Cover C-Factor Extended <br />Disturbed' 34.47 0.0 0.0 0.1800 6.205 <br />Previously Disturbed 2.02 0.0 10.0 0.3250 0.657 <br />Rock Fall 18,80 No sedimen t contribution <br />Mixed Shrub 224,33 56.9 92.6 0.0046 1.032 <br />Dry Mixed Shrub 17,90 20.0 40.0 0.1000 1.790 <br />Juniper Woodland 11,96 28.2 85.2 0.0104 0.124 <br />Wetland 0.00 0.0 50.0 0.0710 0.000 <br />Upper Meadow 0.00 0.0 88.4 0.0074 0.000 <br />TOTAL 309.48 Wt. Ave. 0.032 <br />' One tone per acre mulch. <br />A=RKLSCP <br />R =rainfall factor 30.00 <br />K =soil erodibility factor D.37 <br />LS =combined length slope factor 400' - 24% 11.20 <br />C =cropping management factor 0.0317 <br />P =erosion control practice factor 0.75 <br />A =sediment, tons/acre/year 2.95 <br />ONE YEAR SEDIMENT VOLUME -ACRE FEET 0.365 <br />309.48 ACRES - 115 #/CF <br />TOTAL REQUIRED SEDIMENT POND CAPACITY -- AF 3.817 <br />PR-07 EXH-8 -8 <br />2/03 <br />