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Runoff Curve Number and Runoff <br />Project: Pond015 <br />1. Runoff Curve Number (CN) <br />By: B. Langenfeld Date: 05/11/09 <br />Cover description <br />CN Area(Acre) <br />Topsoil stripped <br />89 2.745 <br />Grasses <br />78 2.794 <br />CN (weighted): <br />83.5 <br />Total Area: <br />5.539 Acre <br />2. Runoff <br />Return Period: <br />Rainfall, P: <br />Runoff, Q: <br />Runoff Volume: <br />100 -Year <br />3.00 in <br />1.4778 in <br />0.6821 Acre -Ft <br />Sediment Volume <br />Sediment build up within the pond was determined using the Revised Universal Soil Loss <br />Equation (RUSLE): <br />A= RxKxLSxCxP <br />A = soil loss in tons /year per acre <br />R = rainfall factor (from standard chart of area) <br />K = soil erodibility factor (function of site specific soil) <br />LS = length slope factor (from contour map & chart) <br />C = management factor dependent upon vegetation & mulch <br />P = erosion control practice factor <br />For the worst case drainage area that drains to Pond 015, the sediment load was determined to <br />REVISED MAY 2010 Attachment 2.05.3(3) -20 -5 <br />