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<br />• <br />\J <br />JfiGpl ~ i <br />DITCH DESIGN FOR TBNPORARY DIOERSIONS A-2 and A-3 <br />Temnorarv Diversion Ditch A-2 <br />Q = 10.94 CFS <br />S = 0.01 FT/FT <br />b = 0.00 FT <br />D/b = OQ <br />K = 2.71 n = 0.030 <br />D - Qn 0.375 _ (10.94)(0.03) 0.375 = 1.07 ft <br />Ks 1/2) - 2.71)(0.01) 112 <br />V = Q/A = (10.94 CFS)/(1.07 FT)(3.21 FT) = 3.19 FT/S <br />TemDOrarv Diversion Ditch A-3 <br />Q = 17.14 CFS <br />S = 0.03 FT/FT <br />b = 0.00 FT <br />D/b = 00 <br />K = 2.71 n = 0.030 <br />~_ 0.375 _ (17.14)(0.030) 0.375 <br />= 1.03 ft <br />D = <br />Rs 1/21 (2.71)(0.03) 1/2 <br />V = Q/A = (17.14 CFS)/(1.03 FT)(3.10 FT) = 5.37 FT/S <br />ORIGINAL <br />GROUND <br />0.3 R FREEB04R0 <br />TYPICAL DITCH CROSS-SECTION <br />• LWH/jb 8/86 Revised 8/86 <br />