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<br />Material: Riprap <br /> <br />Bottom Left Right Freeboard Freeboard Freeboard <br /> <br />Width (ft) Sideslope Sideslope Slope (%) Mult. x <br /> Ratio Ratio Depth (ft) % of Depth <br />(VxD) <br />12.00 ~ 3.0:1 3.0:1 25.0 1.00 <br />Riprap Channel Results: <br />Simons/OSM Method -Steep Slope Design <br /> w/o Freeboard w/ Freeboard <br />Design Discharge: 45.18 cfs <br />Depth: 0.21 ft 1.21 R <br />Top Width: 13.25 ft 19.25 R <br />Velocity*: <br />X-Section Area: 2.63 sq R <br />Hydraulic Radius: 0.198 R <br />Froude Number*: <br />Manning's n*: <br />Dmin: 4.00 in <br />D60: 12.00 in <br />Dmax: 15.00 in <br />• <br />SEDCAD 4 for Windows <br />r....,,.:,.n. man -orno o~...a~ i c,w,..,n <br />Velocity and Manning's n calculations may no[ apply for this method. <br />Structure #8 (Riprap Channel <br />SEC. 78 DITCH 4 <br />Trapezoidal Riprap Channel Inputs: <br />Material: Riorao <br />Bottom LeR Right Freeboard Freeboard Freeboard <br />Sideslope <br />Width (ft) Sideslope <br />i Slope (Mo) Mult. x <br />Depth (ft) % of Depth <br />Ratio Rat <br />o (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 />LJ <br /> w/o Freeboard w/ Freeboard <br />Design Discharge: 50.39 cts <br />Depth: 0.17 ft 1.17 R <br />Top Width: 13.05 R 19.05 ft <br />Velocity*: <br />X-Secion Area: 2.18 sq ft <br />Hydraulic Radius: 0.167 R <br />Froude Number*: <br />15 <br />Filename: STSec28PMP.010807.sc4 <br />Exh. 7-20A-91 <br />Pdnfetl 01-OB-2007 <br />Revision Date: 1 /05/07 <br />Revison No.: PR-02 <br />