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<br />. <br /> <br />. <br /> <br />. <br /> <br />002S3~ <br /> <br />CHAPTER III <br /> <br />PROJECT DEVELOPMENT <br />(Great Northern unit) <br /> <br />Elkhead Canal <br /> <br />Elkhead Canal would have an initial capacity of 145 second-feet and <br />a tenninal capacity of 20 second-feet. It would have a total length of <br />37.7 miles, including 0.9 mile for the feeder canal and 11.7 miles for <br />the lateral to the lands above the Dry Fork of Little Bear Creek. The <br />first 4 miles of the canal would cross steep terrain and would include <br />bench flume, lined and unlined sections, and an inverted concrete siphon <br />across the North Fork of Elkhead Creek. At the outlet of the siphon, 1.8 <br />miles from the head of the ca.nal, the canal would be joined by the feeder <br />canal. The feeder canal also would have a capacity of' 145 second-feet and <br />would consist of bench flume and unlined sections. The remainder of the <br />canal system would consist almost entirely of unlined earth sections and <br />except for several drop structures would be of simple construction. <br /> <br />Two rock-fill diversion dams would be constructed. One llould be on <br />Elkhead Creek at the head of the Elld1ead Canal and one would be on the <br />North Fork at the head of the feeder canal. <br /> <br />Laterals <br /> <br />Costs of laterals were estimated from general data on costs per acre <br />for serving similar lands of other projects. <br /> <br />ConBtruction Considerations <br /> <br />No geological problems are apparent that would seriously hamper the <br />construction of California Park Dam. A few unstable slopes along the <br />first part of the Elkhead Canal line, ho'Wever, would require special work <br />in the design and construction of the canal. The remainder of the work <br />required for the unit is not expected to present serious construction <br />problems. <br /> <br />A construction period of about 2 years would be required for the unit. <br />The work would be limited by climatic conditions to a period from April <br />through November. A construction camp 'Would be required at California <br />Park Reservoir site because of the distance of the site from eXisting <br />housing facil1 ties. Nearby communi ties could provide adequate housing <br />for workers on other construction features. <br /> <br />Cost estimates <br /> <br />'Ihe construction cost of the Great Northern unit is estimated at <br />$4,467,000 or $495 per acre of full irrigation service land or equivalent. <br />The annual operation, maintenance, and replacement costs are expected to <br />amount to $25,100. Estimated costs of the unit are itemized 011 the <br />follOWing page. <br /> <br />37 <br />