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C~ <br />SEDCAD 4 for Windows <br />21 <br />Structure #8 (Riprap Channel) <br />SEC. 28 DITCH 4 <br />Trapezoidal Riprap Channel Inputs: <br />Material: Riorao <br />Left Righf <br />Bottom Freeboard Freeboard Freeboard <br />Sideslope Sideslope Slope (%) <br />Width (R) Mult. x <br />Depth (ft) %of Depth <br />Ratio Ratio (VxD) <br />12.00 3.0;1 3.0:1 30.0 1.00 <br />Riprap Channel Results: <br />Simons/OSM Method -Steep Slope Design <br /> <br /> w/o Freeboard w/ Freeboard <br />Design Discharge: 10.09 cfs <br />Depth: 0.03 ft 1.03 ft <br />Top Vfdth: 12.18 ft 18.18 R <br />Velocity*: <br />X-Section Area: 0.36 sq ft <br />Hydraulic Radius: 0.030 ft <br />Froude Number*: <br />Manning's n*' <br />Dmin: 3.00 in <br />050: 9.00 in <br />Dmax: 11.25 fn <br />Velocity and Manninq's n calculations may not apply for this method. <br />Structure #1 (Pond) <br />SEC. 28 SED TRAP 1 <br />Pond Inputs: <br />Initial Pool Elev: 8,219.80 R <br />Initial Pool: 0.01 ac-ft <br />*Sediment Storage: 0.16 ac-ft <br />Dead Space: 20.00 <br />*Sediment capacity based on Average Annual R of 19.0 for 1 year(s) <br />Emergency Spillway <br />Filename: STSec28Ten24.030807.sc4 Printed 03-09-2007 <br />• <br />Exh. 7-20A-25 Revision Date: 3/12/07 <br />Revision No.: PR-02 <br />