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Elevation <br />(ft)Perf. Riser (cfs)Emergency <br />Spillway (cfs) <br />Combined <br />Total <br />Discharge <br />(cfs) <br />7,125.00 22.512 0.000 22.512 <br />7,126.00 24.066 58.841 82.907 <br />7,127.00 25.526 222.604 248.131 <br />7,128.00 26.907 463.232 490.139 <br />7,129.00 28.220 801.423 829.643 <br />7,130.00 29.205 1,213.837 1,243.042 <br />Structure #9 (Vegetated Channel) <br /> Natural Channel Middle Pond to Section 36 Pond <br /> Trapezoidal Vegetated Channel Inputs: <br />Material: Tall fescue <br />Bottom <br />Width (ft) <br />Left <br />Sideslope <br />Ratio <br />Right <br />Sideslope <br />Ratio <br />Slope (%)Retardance <br />Classes <br />Freeboard <br />Depth (ft) <br />Freeboard <br />% of Depth <br />Freeboard <br />Mult. x <br />(VxD) <br />Limiting <br />Velocity <br />(fps) <br />5.00 2.0:1 2.0:1 6.4 D, B 6.0 <br /> Vegetated Channel Results: <br />Stability <br />Class D w/o <br />Freeboard <br />Stability <br />Class D w/ <br />Freeboard <br />Capacity <br />Class B w/o <br />Freeboard <br />Capacity <br />Class B w/ <br />Freeboard <br />Design Discharge: 16.48 cfs 16.48 cfs <br />Depth: 0.56 ft 0.91 ft <br />Top Width: 7.22 ft 8.65 ft <br />Velocity: 4.85 fps 2.65 fps <br />X-Section Area: 3.40 sq ft 6.22 sq ft <br />Hydraulic Radius: 0.454 ft 0.686 ft <br />Froude Number: 1.25 0.55 <br />Roughness Coefficient: 0.0458 0.1105 <br />Structure #8 (Pond) <br /> Middle Pond <br /> Pond Inputs: <br />Initial Pool Elev: 7,057.00 ft <br />Initial Pool: 0.53 ac-ft <br />*Sediment Storage: 0.00 ac-ft <br />Dead Space: 0.00 % <br />*No sediment capacity defined <br />Perforated Riser <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 21