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Table 11. <br />Trapezoidal Channel Specifications for RDA Perimeter (Side Collection) Ditches - <br />Rip-Rap Alternative <br /> Filter <br /> Riprap Blanket <br /> Discharges D,,,,, Dm„ Filter Channel <br /> Greater Dso Riprap D~, Blanket Bottom Width! Channel <br />Cross Than Dio Thickness Duo Thickness Top Width' Depth <br />Sections (cfs) (inches) (feet) (inches) (inches) (feet) (feet) <br />91-121 89.5 33.75 4 I8 9 10/ 1.44 <br />SWS ]0- 13 27 5 18.6 <br /> 9 0.1 <br />61.5 - 91 59.4 33.75 4 18 9 10/ 1.36 <br />SWS7-9 27 5 18.2 <br /> 9 0.1 <br />51 - 61.5 39.9 12 1.3 5 6 10/ 1.7 <br />SWS 6 9 2.4 18 <br /> 3 0.25 <br />31 - 51 23.8 12 1.3 S 6 3/ 1.8 <br />SWS 4 ' 9 2.4 13.7 <br /> 3 0.25 <br />' Sideslopes are 3:1(H:~ <br />