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z <br />} <br />• <br />:~' • <br />-: • • <br />Ditch Design (PP Exhibit 51 and 52) <br />Q = (1.49/N) AR 2/3 5 1/2; Manning's Equation <br />N = 0.040 <br />R = Area/Wetted Perimeter 2.Sh:1V <br />A = area <br />• S = 0.02 min. <br />Flow Related to Depth <br />@d = 8" Q = ,12.5 CFS <br />@d = 9" Q = 17.2 CFS <br />20h:1V <br />To have a 9" flow depth plus 4" freeboard the top bench will have to be 22' <br />wide with a 5X grade to the inside. <br />Certification <br />Page 9 of the calculation certified by James E. Stover 3-11-85 has been <br />replaced by pages 9-9i. These revised pages have been calculated using the <br />same reference material and have been prepared by Larry M. Reschke, PE 19691. <br />(New 10-31-90) <br />CRDA3 - 14 <br />