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<br />~ <br />o <br />"" <br /> <br />cmPTER II <br /> <br />DESIGNS AND ESTIMATES <br /> <br />-J The present inlet structure below the tailrace of the power plant <br />on East Rifle Creek would be used. Present tunnels and siphons are iL <br />good condition and would require only minor repairs. COncrete bench <br />flumes would be provided through side hill sections where the lower bank <br />permits seepage and is in danger of failure, An existing flume would be <br />covered as protection from falling rocks. Precast concrete siphons 48 <br />inches in diameter would bypass each of two slide areas. Wasteways, <br />drainage crossings, and a measuring flume would be installed. <br /> <br />The laterals that would divert from Grass Valley Canal to irrigate <br />Dry Elk Valley land would be constructed across gently slOp:ing land <br />requiring common excavation. The lateral to the north would have an <br />initial capacity ()f 20 second-feet and the southern lateral would have <br />a capacity of l2 second-feet. Each lat eral would be about 4 miles long. <br />'lUrnouts and other minor structures would be provided as needed. <br /> <br />Drains <br /> <br />An ()pen drain about 1.3 miles in length would be provided to drain <br />a s1lBll area on Harvey Mesa. Part of the drain would be in a natural <br />ilrainage channel and wOlld require only partial excavation. Depth of <br />the drain from average ground surface would be abOut lO feet with li to <br />1 side slopes. <br /> <br />Cost Estima te s <br /> <br />Gonstruction Costs <br /> <br />The construction cost of the Silt project is estimated at ~3,205,OOO <br />or $3,190,000 exclusive of nonreimbursable money expended for investi- <br />gations and surveys from the Colorado River pevelopment Fund. The esti- <br />mate is based on December 1949 prices and includes allowances for ene:i- <br />neering, overhead, contingencies, and rights-of-way. <br /> <br />The estimated construction costs of the various project features and <br />s'1IlUIlarized engineering data on the features are given in the table I'll the <br />f';U:nwinp: page. <br /> <br />15 <br />