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f 1 <br />L.i <br />Trapezoidal Channel in C -Gulch <br />Riprap Sizing - Trapezoidal Channel <br />D50 = Size of Riprap <br />D50 = ((V X S ^.17)/7.58)) ^2 <br />D50 = Diameter in feet <br />V = Velocity <br />S = Slope <br />D50 = 2.3 feet 28 inches <br />Drainage channels C6, C9, C10 & C14 will be constructed at least 6 -feet wide at the bottom with 2H:1V <br />side slopes, 2 -feet deep including freeboard with D50 riprap of 24- inches. <br />PR -07 EXH -8 -16 2/03 <br />