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w/o Freeboard w/ Freeboard <br />Design Discharge: 77.22 cfs <br />Depth: 1.75 ft <br />Top Width: 5.26 ft <br />Velocity: 16.73 fps <br />X-Section Area: 4.61 sq ft <br />Hydraulic Radius: 0.730 ft <br />Froude Number: 3.15 <br />Structure #5 (Riprap Channel) <br /> D-3 Ditch <br /> Trapezoidal Riprap Channel Inputs: <br />Material: Riprap <br />Bottom <br />Width (ft) <br />Left <br />Sideslope <br />Ratio <br />Right <br />Sideslope <br />Ratio <br />Slope (%)Freeboard <br />Depth (ft) <br />Freeboard <br />% of Depth <br />Freeboard <br />Mult. x <br />(VxD) <br />12.00 2.0:1 2.0:1 16.1 2.98 <br /> Riprap Channel Results: <br />Simons/OSM Method - Steep Slope Design <br />w/o Freeboard w/ Freeboard <br />Design Discharge: 0.22 cfs <br />Depth: 0.02 ft 3.00 ft <br />Top Width: 12.07 ft 23.99 ft <br />Velocity*: <br />X-Section Area: 0.22 sq ft <br />Hydraulic Radius: 0.019 ft <br />Froude Number*: <br />Manning's n*: <br />Dmin: 2.00 in <br />D50: 6.00 in <br />Dmax: 7.50 in <br />Velocity and Manning's n calculations may not apply for this method. <br />Structure #4 (Null) <br /> Null at Confluecne D-3 Ditch and Little Collom Gulch <br />Structure #3 (Vegetated Channel) <br /> Little Collom Gulch Natural Channel <br /> Trapezoidal Vegetated Channel Inputs: <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 20