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DAM EMBANKMENT <br />The embankment, spillway and outlet pipe are described in this <br />section. Again the information is summarized from the Corp of <br />Engineers 1990 report. <br />EMBANKMENT: The reconstructed dam would be an earth embankment <br />with following the dimensions: <br />* 20 feet high, <br />* crest length of about 7,525 feet, <br />* crest width of 10 feet, <br />* 3.OH:1.OV upstream and 2.5H:1.OV downstream slopes <br />* 48 inch diameter outlet pipe, <br />* 1,500 foot wide spillway. <br />Figure 4 shows the cross section of the dam at the outlet pipe. <br />Figure 5 shows the front elevation view of the embankment looking <br />upstream from below the dam. Figure 6 shows a plan view of the dam <br />and spillway. <br />The dam crest would be raised an average of 4.5 feet for the entire <br />length of the existing crest. The Corp proposed a 10 foot wide <br />crest which should be 14 feet according to Colorado "Rules and <br />Regulations for Dam Safety and Dam Construction". <br />A new 10 foot high embankment would be constructed on the west to <br />prevent the reservoir from flowing through the natural spillway. <br />The existing concrete upstream face would be removed. A cutoff <br />trench would located near the upstream toe of the existing <br />embankment, approximately under the centerline of the new <br />embankment. The embankment would be constructed of impervious <br />material obtained from the spillway excavation. <br />A 27 inch layer of rip rap and bedding is suggested on the upstream <br />face covering 20 feet vertically and 2000 feet horizontally. <br />The Hudson Canal, adjacent to the downstream toe of the embankment <br />must be moved further to the north. <br />OUTLET PIPE: The existing outlet pipe would be removed and a 48 <br />inch diameter pipe installed. The pipe is expected to be <br />reinforced concrete pipe installed on a concrete cradle. <br />SPILLWAY: The spillway in combination with surcharge was sized to <br />pass 50$ of the PMP. The crest of the spillway would be at <br />elevation 5095.2 feet and be 1,500 feet wide. The spillway channel <br />would extend upstream 1,600 feet and downstream 1,700 feet <br />downstream. <br />Bootleg Dam 6 <br />