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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Three main alternatives were investigated to provide a means to <br />concentrate the 100 year flow through the hi gh school property and <br />convey it to the Rito Seco north of 9th Street. <br /> <br />a) an open diversion channel with a 35 foot top width, an 8 foot <br />bottom width at a 100 year depth of 2.5 ! feet <br /> <br />b) a storm sewer system to carry the 100 year flow from the school <br />property <br /> <br />c) a combination of a low flow storm sewer system, an open channel <br />and broad grassed swale <br /> <br />4. Recommendations <br /> <br />WRC recommends that the flow from the North Drainage Basin be <br />concentrated downstream of the school entrance from Highway 159. In <br />order to accomplish this a concrete low flow ford dropping into an <br />open channel of grouted riprap will be required (see Sheet 2 of 4 of <br />drawings). From the open channel the low flow will be collected by <br />a drop inlet and directed into a 24" storm sewer just upstream from <br />the school entrance from 9th Street. The higher flows will pass <br />over a concrete overflow structure and be carried to the Rito Seco <br />in a broad grass-lined swale through the playground. This will <br />minimize reshaping of the area south of the school and should not <br />affect playground activities in the area except during construction, <br />and flood conditions. The flood depths and velocities will not be <br />hazardous to human activities in the area. <br /> <br />See Sheet 2 of 4 <br /> <br />-23- <br />