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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 5.7 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: 87.92 cfs 87.92 cfs <br />Depth: 1.15 ft 1.56 ft <br />Top Width: 9.62 ft 11.22 ft <br />Velocity: 10.41 fps 6.97 fps <br />X-Section Area: 8.44 sq ft 12.62 sq ft <br />Hydraulic Radius: 0.831 ft 1.056 ft <br />Froude Number: 1.96 1.16 <br />Roughness Coefficient: 0.0302 0.0529 <br />Structure #2 (Pond) <br /> Section 25 Pond <br /> Pond Inputs: <br />Initial Pool Elev: 6,868.00 ft <br />Initial Pool: 4.36 ac-ft <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 16.00 18.00 182.00 5.00 0.0150 6,872.00 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 />6,875.00 45.00 2.00:1 2.00:1 20.00 <br /> Pond Results: <br />Peak Elevation: 6,875.04 ft <br />Dewater Time: 2.76 days <br />Dewatering time is calculated from peak stage to lowest spillway <br />Filename: Exhibit 7 Item 23 Part B 25-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