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<br />I <br /> <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 />. <br /> <br />Install another catch basin with steel grating at <br />corner of Hinsdale Avenue and Platte Drive. Then <br />install an underground drain relief between the <br />houses to drain initial storm water from Hinsdale <br />Avenue into the ponding area. <br /> <br />. <br /> <br />Define 2-, 10- and 100-year flood boundaries in the <br />ponding area to show the effects of the 24-inch <br />culvert under Platte Canyon Road. This boundary <br />information would also be available for use by land <br />developers. Recommend no development within the <br />2-year ponding area. <br /> <br />. <br /> <br />Install an inverted siphon with inlet and outlet <br />structures to separate irrigation water from storm <br />flows at the intersection of Platte Canyon Ditch and <br />downstream of 24-inch CMP drainage culvert. Construct <br />earth channel and berms on both sides of ditch <br />crossings to confine flood water in the drainage <br />channel. <br /> <br />. <br /> <br />Downstream of Platte Canyon Ditch crossing, confine <br />the flood water in a swale-type flood drainageway <br />which should be constructed to minimize effects on <br />agricultural activities during dry season. <br /> <br />2-7 <br />