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Run -off Volume <br />Pond 015 excavation has been designed to contain the 100 -year 24 -hour event with no <br />discharge. The pond is completely incised, so there is no embankment that could fail. The <br />excavated side slopes are 2H:1 V. The run -off volume for the worst case drainage area is 0.68 <br />acre -ft. This was determined using a combined curve number from the weighted average of the <br />curve numbers of the undisturbed areas as well as the area ahead of the pit which has just had <br />its topsoil stripped.— <br />REVISEDMAY2010 Attachment 2.05.3(3) -20-4 <br />