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PORTAL COLLECTION CULVERT <br />12" Diameter CMP <br />• Alternate sedimentation control will be provided for the runoff <br />from the pootal area and from area C. The flow from Area A ~ C <br />is designed to be collected at a point on the south side of the <br />area where it will be filtered through straw bales or other alternate <br />sediment control then allowed to flow to the 36" diameter portal <br />culvert. The portal collection culvert must be sized to handle the <br />peak flow from Areas A S C which is 2.30 CFS. A 12" diameter <br />will be installed to handle this flow. <br />COLLECTION DITCH CD-3 <br />FLOW FROM DRAINAGE AREA N0. 3 <br />FLOW IN A TRIANGULAR CHANNEL <br />DEPTH D 0.900 FEET <br />S LOPE S 0.010 EXPRESS AS DECIMAL <br />MANNINGS "N" N 0.030 EXPRESS AS DECIMAL <br />DITCH SIDE SLOPE X 1.500 SLOPE = X:1 <br />AREA=(W*D)+(X*D)= 1.22 FEET^2 <br />WETTED PERIMETER=(W)+2((XD^ 2+D^2))^.5 3.24 FEET <br />R=AREA/WETTED PERMITER 0.37 <br />V=(1.49/N)*(R^.667)*(S^.5)= 2.58 FEET/SEC <br />Q = A X V = <br />Q REQUIRED <br />Collection ditch CD-3 will be a V ditch <br />1.5h:1v side slopes. With a freeboard of <br />of CD-3 is 1.200 feet. The flow <br />erosion should not be a problem. <br />3.13 CFS <br />2.93 <br />0.900 feet deep. <br />0.3' the total depth <br />velocity is slow enough <br />PORTAL CULVERT <br />36" Diameter CMP <br />A drainage structure has been provided to <br />the portal area. This culvert must handl <br />#2, #3, A, B & C which is 23.043 CFS. <br />easily handle this flow. <br />handle the flow from <br />e the peak flow from areas <br />A 36" diameter culvert will <br />• B-95 <br />