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. RUN-OFF VOLUME - - POND F <br /> PRECIP DIRECT RUN-OFF <br /> ACRES CURVE AMOUNT RUN-OFF VOLUME AF <br /> !z'1• I 94 .2 83 1.6 0.44 3 .43 <br /> 136.7 58 1.6 0. 00 0. 04 <br /> z�3 .g �3 0.9 3 .47 �•55 <br /> TOTAL REQUIRED WATER VOLUME <br /> SEDIMENT VOLUME <br /> USING THE UNIVERSAL SOIL LOSS EQUATION <br /> A = R K L S C P <br /> 3 0. 0 0 <br /> R = rainfall factor 0.21 <br /> K = soil erodibility factor <br /> LS = combined length slope factor 3 . 5% - 2000' 1. 05 <br /> C = cropping management factor <br /> P = erosion control practice factor 0.50 any( <br /> A = sediment,tons/acre/year <br /> 3 . 31 <br /> G' <br /> THREE YEAR SEDIMENT VOLUME ACRE FEET 0.91 <br /> 230.9 Acres 115 #/Cubic Feet <br /> • TOTAL REQUIRED SEDIMENT POND F CAPACITY -- AF 4 . 38 <br /> PEAK FLOW CALCULATIONS <br /> The following peak flow calculations were compiled with <br /> the computer program STORM version 6.21. Details of the <br /> run-off calculations are shown on the following pages. <br /> 10-YR 25-YR <br /> 24 HR 24 HR <br /> Event Event <br /> Area CD-3E 3 .84 14 .80 16 .66 <br /> Area CD-2E 2 .94 .1•85 4 .88 <br /> Area CD-1E 10.21 16.97 <br /> Area CD-1W 4.93 2.63 8.20 <br /> Area Pond F 17.51 <br /> Peak flow for Pond F spillway 62 . 36 9,?. So <br /> Four collection ditches will be constructed to collect <br /> and channel the run-off to sediment pond F. Ditch CD-3E <br /> feeds CD-2E which feeds CD-1E. The peak flow in the <br /> ditches will be as follows: 7yPE T <br /> Ditch CD-3E 3 .84 9.9 Z y.29 <br /> • Ditch CD-2E 6.78 /OXi <br /> Ditch CD-1E 16.99 16• 1'( <br /> Ditch CD-1W 4 .93 z. 6 3 <br /> 9-28 July 1992 <br />