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Pond Inputs: <br />Initial Pool Elev: 7,116.00 ft <br />Initial Pool: 0.97 ac-ft <br />*Sediment Storage: 0.00 ac-ft <br />Dead Space: 0.00 % <br />*No sediment capacity defined <br />Perforated Riser <br />Riser <br />Diameter <br />(in) <br />Riser Height <br />(ft) <br />Barrel <br />Diameter <br />(in) <br />Barrel <br />Length (ft) <br />Barrel Slope <br />(%)Manning's n Spillway Elev <br />(ft) <br />Number of <br />Holes per <br />Elev <br />18.00 11.00 18.00 170.00 3.00 0.0150 7,118.00 2 <br />Emergency Spillway <br />Spillway Elev Crest Length <br />(ft) <br />Left <br />Sideslope <br />Right <br />Sideslope <br />Bottom <br />Width (ft) <br />7,125.00 46.00 3.00:1 3.00:1 30.00 <br /> Pond Results: <br />Peak Elevation: 7,121.77 ft <br />H'graph Detention Time: 2.23 hrs <br />Pond Model: CSTRS <br />Dewater Time: 0.96 days <br />Trap Efficiency: 100.00 % <br />Dewatering time is calculated from peak stage to lowest spillway <br />Elevation-Capacity-Discharge Table <br />Elevation Area <br />(ac) <br />Capacity <br />(ac-ft) <br />Discharge <br />(cfs) <br />Dewater <br />Time <br />(hrs) <br />7,105.00 0.000 0.000 0.000 Top of Sed. Storage <br />7,106.00 0.010 0.003 0.000 <br />7,107.00 0.025 0.020 0.000 <br />7,108.00 0.038 0.052 0.000 <br />7,109.00 0.053 0.097 0.000 <br />7,110.00 0.075 0.161 0.000 <br />7,111.00 0.093 0.244 0.000 <br />7,112.00 0.112 0.347 0.000 <br />7,113.00 0.132 0.469 0.000 <br />7,114.00 0.154 0.611 0.000 <br />7,115.00 0.178 0.777 0.000 <br />7,116.00 0.205 0.969 0.000 Low hole SPW #1 <br />7,117.00 0.235 1.188 0.473 5.63* <br />Filename: Exhibit 7 Item 23 Part B 10-Yr 24-Hr Section 25 During Mining.sc4 Printed 03-17-2022 <br />SEDCAD 4 for Windows <br />Copyright 1998 -2010 Pamela J. Schwab <br />Civil Software Design, LLC 19