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<br />e <br /> <br />e <br /> <br />.....-- <br /> <br />S = 0.0044 <br /> <br />Of = 0.463 i~Ql 8/3 (0.0044) 1/2 = 14.73 cfs <br />m 1m" <br /> <br />Use 1 - 3011 CMP <br /> <br />Ditch 7, Overflow from Ditch 2} Section 2-2 <br />Qc = 148 cfs - 14.73 = 133.3 c s <br /> <br />Slope = 0.0005 <br />Side Slope = 3:1 <br />Mannings Coefficient = 0.035 <br />Qc = 133.3 cfs <br /> <br />Using the nomograph for this channel the flow (Oc) will require a bottom width of <br />25 feet and a depth of 2.7 feet. <br /> <br />The design of the overflow ditch given above is presented on Attachment 8B. <br /> <br />2. The flow (03) into the HCFCD ditch from ditch 4 is 12.9 cfs (refer to <br />Attachment No. 8C). <br /> <br />Given: <br /> <br />03 = 12.9 cfs <br />Vf = 3 fps <br />n = 0.024 (THO-Hydraulic Manual, Corrugated Metal Pipe) <br /> <br />Assume one pipe will be used <br />Minimum pipe size allowed = 2411 (HCFCD Specifications) <br />A = 12.9 = 4.30 ft2 <br /> <br />..~,.....,. <br /> <br />~ .... :: <br /> <br />D (pipe) = 4 (4.30) = 2.34 ft = 28.1 in <br /> <br />Use D = 30" CMP <br /> <br />Vf = 3 = 0.590 (30)2/3 (S)1/2 <br />m (12) <br /> <br />".-' -':'" '.; , <br /> <br />S = 0.0044 <br /> <br />Of = 0.463 (21) 8/3 (0.0044)1/2 =' 14.73 cfs <br />.' "u:tr2lf (N)' - - . '''. .. '".''' . <br /> <br />Use 1- jO" CMP . <br /> <br />Ditch 8, Overflow from Ditch 4J Section 4-4 <br />Qc = 188 cfs - 14.73 = 173.3 c s <br /> <br />-22- <br /> <br />,",... <br /> <br />. t" '. ..' . <br /> <br />." ..' ........:.. .0... '. ....; <br /> <br />. . .' 7-1'-.f~ <br />