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i* <br />SEDIMENT VOLUME - Pond B <br />Use the universal soil loss equation. <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 />SEDIMENT VOLUME - Pond B <br />Calculate Weighted Average C- Factor <br />Area <br />Acres <br />% Canopy <br />% Cover <br />C- Factor <br />Extended <br />Disturbed* <br />45.20 <br />0.0 <br />0.0 <br />0.1800 <br />8.136 <br />Mixed Shrub <br />55.00 <br />56.9 <br />92.6 <br />0.0046 <br />0.253 <br />Dry Mixed Shrub <br />17.60 <br />20.0 <br />40.0 <br />0.1000 <br />1.760 <br />Juniper Woodland <br />30.50 <br />28.2 <br />85.2 <br />0.0100 <br />0.305 <br />Wetland <br />1.70 <br />0.0 <br />50.0 <br />0.0710 <br />0.121 <br />Sage <br />0.20 <br />0.0 <br />78.0 <br />0.0160 <br />0.003 <br />Meadow <br />0.20 <br />0.0 <br />88.4 <br />0.0074 <br />0,001 <br />TOTAL 150.40 <br />* One ton mulch per acre. <br />SEDIMENT VOLUME - Pond B <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 />150.40 ACRES - 115 # /CF <br />TOTAL REQUIRED SEDIMENT POND CAPACITY - - AF <br />PR -07 EXH -8 -5 <br />Wt. Ave. 0.070 <br />30.00 <br />0.37 <br />11.20 <br />0.0703 <br />0.75 <br />WR <br />0.394 <br />3.462 <br />r71X7i <br />