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Structure Detail: <br />Structure #13 (Erodible Channel) <br /> Ditch on Southside of Collom Haul Road <br /> Triangular Erodible Channel Inputs: <br />Material: Shales and hardpans <br />Left <br />Sideslope <br />Ratio <br />Right <br />Sideslope <br />Ratio <br />Slope (%) Manning's n <br />Freeboard <br />Depth (ft) <br />Freeboard <br />% of Depth <br />Freeboard <br />Mult. x <br />(VxD) <br />Limiting <br />Velocity <br />(fps) <br />1.5:1 1.5:1 7.0 0.0250 6.0 <br /> Erodible Channel Results: <br />w/o Freeboard w/ Freeboard <br />Design Discharge: 2.84 cfs <br />Depth: 0.56 ft <br />Top Width: 1.69 ft <br />Velocity: 5.98 fps <br />X-Section Area: 0.47 sq ft <br />Hydraulic Radius: 0.234 ft <br />Froude Number: 1.99 <br />Structure #12 (Erodible Channel) <br /> Northwest Crusher Ditch w/Natural Channel <br /> Trapezoidal Erodible Channel Inputs: <br />Material: Shales and hardpans <br />Bottom <br />Width (ft) <br />Left <br />Sideslope <br />Ratio <br />Right <br />Sideslope <br />Ratio <br />Slope (%) Manning's n <br />Freeboard <br />Depth (ft) <br />Freeboard <br />% of Depth <br />Freeboard <br />Mult. x <br />(VxD) <br />Limiting <br />Velocity <br />(fps) <br />3.00 2.0:1 2.0:1 15.0 0.0250 6.0 <br /> Erodible Channel Results: <br />w/o Freeboard w/ Freeboard <br />Design Discharge: 21.84 cfs <br />Depth: 0.47 ft <br />Top Width: 4.88 ft <br />Velocity: 11.76 fps <br />X-Section Area: 1.86 sq ft <br />Hydraulic Radius: 0.364 ft <br />Filename: Exhibit 7 Item 23 Part M 100-Yr 24-Hr Coal Pond.sc4 Printed 03-16-2022 <br />SEDCAD 4 for Windows <br />Copyright 1998 -2010 Pamela J. Schwab <br />Civil Software Design, LLC 6