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<br />(e <br /> <br />~,. <br /> <br />'- <br /> <br />resulting in a peak flow of 900 cubic feet per second per inch of runoff per <br /> <br />square mile., For this 0.15 square mile watershed the peak runoff is 90.4 <br /> <br />cubic feet per second. <br /> <br />Peak runo ff va 1 ues computed by the two methods agree close ly, however <br /> <br />90.4 cfs is more conservative and was used for hydraulic computations. <br /> <br />6.3 Inlet and Conveyance Facilities <br />As shown on Figure 3, the watershed empties directly toward the proposed <br /> <br />water treatment plant site. To avoid disruption of the site by a ditch <br /> <br />outlet, a corrugated steel pipe culvert routed around the plant was selected. <br /> <br />The alignment is also shown in Figure 3. Inlet facilities which collect and <br />direct flows into the pipe are necessary. There is a potential for tree <br /> <br />trunks an~. other vegetative debris and rocks from the watershed during a <br />.' ,-_.~-- <br /> <br />-. <br /> <br />high intensity storm. A trash rack in conjunction with steel pipe debris <br />-- <br /> <br />stops is recommended at the culvert entrance. <br /> <br />\ <br /> <br />\ <br /> <br />\ . <br /> <br />,/ ,.,~ <br /> <br />\ <br /> <br />" <br /> <br />6-3 <br />