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Discharge though the 4 inch orifice (primary outlet) was calculated using <br />SEDCAD+ which utilizes the following equation for orifice flow: <br />O = Ca (2gh)°s <br />Where: C =orifice coefficient (0.6) <br />a =cross section area of inlet (ft~ <br />g =gravitational constant (32.2 ft/sect <br />H =height of water above inlet (ft) <br />The discharge rate through the primary outlet is as follows: <br />Elevation Discharge (cfs) <br />7540 0.4 <br />7541 0.6 <br />7542 0.7 <br />7543 0.8 <br />• 7544 0.9 <br />7545 1.0 <br />7546 1.1 <br />7546.9 1.2 <br />Total dewatering time for the pond is approximately 28 hours. <br />The emergency spillway capacity was calculated using Mannings Equation for <br />Open Channel Flow assuming no fbw through the orifice. Results are shown <br />on the Drainage and Sediment Corrtrol Map (Map R-1). <br />Culverts <br />Peak flows resulting from the 10-year, 24-hour storm event were used to design <br />all culverts. Culverts remaining as permanent structures were sized according <br />to procedures set forth by the U.S. Bureau of Public Roads. Projecting inlets <br />. were used as a conservative estimate. Culvert designs are summarized in Table <br />2, Permanent Culvert Design Summary. Figure 2, U.S. Bureau of Public Roads <br />15 <br />