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• Sediment Pond <br />Runoff Calculation <br />Area Basin - 28 Acres <br />Rainfall - 10 yr 24 hr event - 2.3 inches <br />Curve Number - 90 for Disturbed Area <br />- 72 for Undisturbed Area <br />Peak flow for 10 yr 24 hr precipitation event <br />12 Acres - Slope 50o Curve Number 72 <br />16 Acres - slope 4g Curve Number 90 <br />Slope Adjustment Factor 1.18, '_.0 respectively <br />Peak Flow for 50". Slope 20 cfs/inch of runoff <br />Peak flaw for 4a Slope 14 cfs/inch of runoff <br />Assume that flows are not cumulative at sediment pond <br />Peak Flow for Disturbed Area 19 cfs <br />Peak Flaw for Undisturbed Area 9 cfs <br />Runoff - 1.35 inches far Disturbed Area <br />- .43 inches for Undisturbed Area <br />Volume of Runoff - 2.23 Acre-Feet <br />Sediment Volume <br />Assume .OS Acre Ft/Acre of Disturbed Area <br />Disturbed Area - 16 Acres <br />.8 P.cre Ft for Sediment <br />Total Volume of Sediment Pond <br />3.03 Acre Ft <br /> <br />