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SEDCAD 4 for Windows <br />Combined <br />Elevation Emergency Total <br />(R) Spillway (cfs) Discharge <br />(6s) <br />8,225.00 1.830 1.830 <br />Structure #16 /Riprap Channel) <br />SEC. 28 DITCH 9 <br />Trapezoidal Riprap Channel Inputs: <br />Material: Riorao <br />t8 <br /> <br />Bottom LeR Right Freeboard Freeboard Freeboard <br /> <br />Width (R) Sideslope Sideslope Slope (%) Mult. x <br /> Ratio Ratio Depth (ft) %of Depth (VxD) <br />12.00 3.0:1 3.0:1 20.0 1.00 <br />Riprap Channel Results: <br />Simons/OSM Method -Steep Slope Design <br /> w/o Freeboard w/ Freeboard <br />Design Discharge: 4.36 ds <br />Dep[h: 0.04 ft 1.04 ft <br />Top Width: 12.23 ft 18.23 R <br />Velocity*: <br />X-Section Area: 0.47 sq ft <br />Hydraulic Radius: 0.038 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 #22 (Null? <br />SEC. 28 NULL 4 <br />Structure #23 /RlDrdp Channe%/ <br />SEC. 28 DITCH 14 <br />Trapezoidal Riprap Channel Inputs: <br />Material: Riorao <br />Filename: STSec28Ten24.030807.sc4 <br />Printed 03-09-2007 <br /> <br />• <br />Exh. 7-20A-22 Revision Date: 3/12/07 <br />Revision No.: PR-02 <br />