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<br />", <br /> <br />....'~. ; <br /> <br />.' <br />'1 <br />i <br />, <br /> <br />i <br />., <br /> <br />i <br />I <br /> <br />i:~' .) .,. <br />v....J~;..J <br /> <br />Platte River. Downstream water requlrements could in part be satisfied by recovery <br />of the seepage. <br />ConsideratIon wm be given to using soil cement in lieu of riprap for upstream <br />slope protection during final design stage if suitable borrow material [s available. The <br />amount of son cement material requlred would be approximately the same as riprap. <br />A gated. concrete service spillway, an auxiliary lmcontrolled earth channel spIll- <br />way with concrete sill, and the river outlet works would be located on the north side of <br />the dam. The river outlet works would be capable of dlschaxglng 3900 cubIc feet per <br />second with the reservoIr water surface at the ma:dmum conservation elevation of 4399 <br />feet. Should the desIgn flood occur, which (5 a remote possibility, the joint-use and <br />e.'Cclusive flood control capacities would be filled and surcharge in the reservoir above <br />the ma.ximum storage level would reach 636.000 acre-feet. At maximum surcharge <br />level the comblned service and au."dllary spillways wLll be designed to discharge a total <br />of 234.490 cubic feet per second. Space allocation in the reservoir and area-capacity <br />data includLng 50 and 100 year sedlment conditions are shown on Figure 4. The Inflow <br />design :flood is estimated to have a peak discharge of 497.100 cubic feet per second and <br />a 10 day volume of 2,030,000 acre-feet. <br />The e.'l:isting diversion works for the Fort Morgan Canal and a portion of the can- <br />al would be Inundated by the Narrows Reservoir. The Fort Morgan R eservoi.r and Irri- <br />gation Company. owner of the canal. holds a direct flow right of 323 cubic feet per sec- <br />ond with a priority date of October 18, 1882. An outlet for the Fort Morgan Canal <br />would be located near the right abutment of the dam to satisfy the water rIght entitle- <br />ment of the company and deliver a.ny project water which the company might obtain from <br />the reservoir through the Lower South Platte Water Conservancy District. The capacity <br />would be 350 cubic feet per second. <br />Construction of Narrows Dam ",.nI require approxlmately 3.7 million cubic yards <br />of pervious and 5. 9 million cubic yards of impervious borrow materiaL The railroad <br />relocation would require an additionall. 6 million cubic yards of borrow. Borrow quan- <br />tities are about 15 percent greater than the embankment quantities: to allow for shrink- <br /> <br />:1./ <br /> <br />age durIng compaction. <br /> <br />3. <br /> <br />- '" <br />