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i~ <br />• <br />• <br />RUN-OFF VOLUME - -Pond C <br /> Precip Direct Run-off <br /> Area Acres Curve # Amount Run-off Vol A-F <br />1 Disturbed 32.80 87.6 1.8 0.78 2.14 <br />2 Previously Dist 7.70 74 1.8 0.26 0.17 <br />3 Rockfall 11.66 89 1.8 0.86 0.84 <br />4 Rockfall Trans. 7.11 63 1.8 0.06 0.04 <br />5 Mountain Shrub 222.80 4l 1.8 0.00 0.00 <br />6 Dry Mountain Shrub 17.60 57 1.8 0.01 0.02 <br />7 Juniper Woodland 12.20 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 311.87 3.24 <br />TOTAL REQUIRED WATER VOLUME - - A-F 3,24 <br />SEDIMENT VOLUME -Pond C <br />The Topographic Factor LS is difficult to evaluate for a steep mountainous drainage area. <br />According to the LS factor table, when the length of slope exceeds 400 feet and or percent <br />slope exceeds 24 percent, soil loss estimates aze speculative as these values are beyond the <br />range of research data Therefore, an LS factor using 400 feet and 24 percent will be used for <br />this calculation. <br />Calculate Weighted Average C-Factor <br />Area Acres % Canopy % Cover C-Factor Extended <br />Distwbed* 32.80 <br />Previously Dist 7.70 <br />Rock Fall 18.77 <br />Mixed Shrub 222.80 <br />Dry Mixed Shrub 17.60 <br />Juniper Woodland 12.20 <br />Wetland 0.00 <br />Upper Meadow 0.00 <br />0.0 0.0 <br />0.0 10.0 <br />No sediment contribution <br />56.9 92.6 <br />20.0 40.0 <br />28.2 85.2 <br />0.0 50.0 <br />0.0 88.4 <br />TOTAL 311.87 <br />* One ton 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 managemenl factor <br />P =erosion control practice factor <br />A =sediment, tons/acre/yeaz <br />PR-03 <br />EXH-8 -] 0 - <br />0.1800 5.904 <br />0.3250 2.503 <br />0.0046 1.025 <br />0.1000 1.760 <br />0.0104 0.127 <br />0.0710 0.000 <br />0.0074 0.000 <br />Wt. Ave. 0.036 <br />30.00 <br />0.37 <br />11.20 <br />0.0363 <br />0.75 <br />3.38 <br />5/99 <br />