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SEDCAD 4 for Windows <br />f`nrnminh41g0A _9M (1 Pnmcla I Qrh' -K <br />Riser <br />Diameter Riser Height <br />Barrel <br />Diameter Barrel Barrel Slope <br />Number of <br />Manning's n Spillway Elev Holes per <br />(in) (ft) <br />(in) Length (ft) ( /o) <br />(ft) Elev <br />18.00 16.00 <br />18.00 150.00 2.00 <br />0.0150 7,471.00 2 <br />Pond Results: <br />Emergency Spillway <br />Spillway Elev Crest Length Left Right Bottom <br />(ft) Sideslope Sideslope Width (ft) <br />7,476.00 30.00 2,00:1 2.00:1 30.00 <br />Peak Elevation: 7,475.83 ft <br />H'graph Detention Time: <br />3.19 hrs <br />Pond Model: <br />CSTRS <br />Dewater Time: <br />1.35 days <br />Trap Efficiency: <br />18.81% <br />Dewatering time is calculated from peak stage to lowest spillway <br />Elevation - Capacity- Discharge Table <br />Elevation <br />Area <br />(ac) <br />Capacity <br />(ac -ft) <br />Discharge Dewater <br />Time <br />(cfs) (hrs) <br />7,455.00 <br />0.020 <br />0.000 <br />0.000 Top of Sed. Storage <br />7,455.50 <br />0.025 <br />0.011 <br />0.000 <br />7,456.00 <br />0.030 <br />0.025 <br />0.000 <br />7,456.50 <br />0.036 <br />0.042 <br />0.000 <br />7,457.00 <br />0.043 <br />0.061 <br />0.000 <br />7,457.50 <br />0.050 <br />0.085 <br />0.000 <br />7,458.00 <br />0.057 <br />0.111 <br />0.000 <br />7,458.50 <br />0.066 <br />0.142 <br />0.000 <br />7,459.00 <br />0.074 <br />0.177 <br />0.000 <br />7,459.50 <br />0.083 <br />0.216 <br />0.000 <br />7,460.00 <br />0.093 <br />0.260 <br />0.000 <br />7,460.50 <br />0.102 <br />0.309 <br />0.000 <br />7,461.00 <br />0.112 <br />0.363 <br />0.000 <br />7,461.50 <br />0.122 <br />0.421 <br />0.000 <br />7,462.00 <br />0.133 <br />0.485 <br />0.000 <br />7,462.50 <br />0.144 <br />0.554 <br />0.000 <br />7,463.00 <br />0.155 <br />0.629 <br />0.000 <br />7,463.50 <br />0.167 <br />0.710 <br />0.000 <br />Filename: WTPond 25 24 active mining case 082610.sc4 Printed 08 -26 -2010 <br />Exh. 7 -20C -107 Revision Date: 8/27/2010 <br />Revision No.: TR -88 <br />