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• SEDDI.WK1 <br />SEDIMENT POND D CAPACITY <br />Sediment pond D is to be constructed in the southwest <br />portion of the permit area. Sediment pond D will contain <br />the run-off from the southwest edge of Mining Area No. 2. <br />RUN-OFF VOLUME - - POND D <br />PRECIP DIRECT <br />ACRES CURVE AMOUNT RUN-OFF <br />34.800 80 1.6 0.34 <br />TOTAL REQUIRED WATER VOLUME <br />SEDIMENT VOLUME <br />USING THE UNIVERSAL SOIL LOSS EQUATION <br />A= R K L S C P <br />• R = rainfall factor <br />K = soil erodibility factor <br />LS = combined length slope factor 2.7% - 2000' <br />H = 60 L = 2250 S = 60/2250 = 2.7% <br />C = cropping management factor <br />P = erosion control practice factor <br />A = sediment,tons/acre/year <br />THREE YEAR SEDIMENT VOLUME ACRE FEET <br />34.8 Acres 115 #/Cubic Feet <br />TOTAL REQUIRED SEDIMENT POND CAPACITY -- AF <br />• <br />RUN-OFF <br />VOLUME AF <br />0.97 <br />0.97 <br />30.00 <br />0.21 <br />0.64 <br />1.00 <br />0.50 <br />2.02 <br />0.08 <br />1.06 <br />9-13 <br />