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• Because the gated decant will remain open, discharge was calculated using <br />SEDCAD+ which utilizes the following equation for orifice flow: <br />O = Ca (2gh)o.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 0.3 <br />7541 0.5 <br />7542 0.7 <br />7543 0.8 <br />• 7544 0.9 <br />7545 1.0 <br />7546 1.1 <br />7547 1.1 <br />7547.5 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 flow through the orifice. Results are shown on <br />the Pond 4 Design Map (Map R•3). <br /> <br />19 <br />