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<br />One last change that I used was to change from a fast unit hydrograph response shape to a <br />medium one. The increase in vegetation would decrease the peak flow of the runoff. <br />I reran the two SEDCAD designs, using the values discussed above. I have attached <br />these designs to this memo. For the design run for the cut slope and pad SAE, labeled <br />"tanksael", I changed the one control practice factor from a zero to .04. The predicted <br />peak settleable solids was 0.71 ml/l. For the design run for the area down gradient of the <br />pad, labeled "tanksael", I changed the one control practice factor from a zero to .04, the <br />curve numbers from 98 and 91 to 75 and the unit hydrograph response shape to medium. <br />The predicted peak settleable solids came out to be 0.94 ml/1. The compliance limit is 0.: <br />mUl. <br />It would appear that one row of silt fence at the furthermost down gradient level of the <br />water tank area would be needed to reduce the sediment yield to a value below 0.~ ml/1 <br />for the entire water tank area. <br />Attachments <br />c:\wp61 \westelk\memosae 1 <br />