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. . in the project cost. The total capital cost for the McElmo Creek Unit is $23,167,000 and amounts to an annual cost of tl,921,000 per year. Project Costs Highline/Rocky Ford Combination Rocky Ford Pipe Laterals Lone Pine Lateral Upper Hermana Lateral Subtotal Interest During Construction Total t13,411,OOO 3,040,000 2,786,000 896,000 $20,133,000 3,034,000 $23,167,000 Cost effectiveness is calculated by dividing the annual cost of the project by the annual reduction in mg/L. The cost effectiveness for the McElmo Creek Unit is: tl,921,OOO/2.6 mg/L ; $739,OOO/mg/L The largest increment of salinity reduction, approximately 1.7 mg/L, would result from combining the "Highline and Rocky Ford Ditches into one enlarged and relined canal. Both canals now traverse an area of saline soils of Mancos Shale origin. Lining of two. segments of the Lone Pine and one of the Upper Hermana laterals would result in incre- mental reductions of 0.7 and 0.2 mg/L, respectively, at Imperial Dam. Combining the Rocky Ford Ditch into the Highline Ditch would in- crease the amount of land for which gravity-pressure could be developed for possible sprinkler irrigation. Land west of the Rocky Ford Ditch is at a low enough elevation relative to the new Highline Canal that adequate pressure would be available. This would encourage the use of ~?rinklers, a key element of the on-far~ salinity control program being studied in the area by the U.S. Department of Agriculture's Soil Con- servation Service. The use of sprinklers would also improve irrigation efficiences, as would canal lining. Operation and maintenance costs on about 20 miles (32 kilometers) of the canal system would be eliminated by abandoning the Rocky Ford Ditch. PLAN DESCRIPTION . HIGHLINE-ROCKY FORD CANAL COMBINATION -- The plan calls for rebuilding and enlarging the Highline Ditch and combining its flows with those of the Rocky Ford Ditch, which would be abandoned. Water would be con- veyed to the Rocky Ford service area through seven new pipe laterals, described in the next section, that would originate from the new High- line Canal. The enlarged Highline Canal would be earth-lined over its entire length of 22.8 miles (36.7 kilometers), with gravel riprap along the sides for erosion protection. The new canal would be constructed immediately adjacent to the present alignment. Cost estimates have in- cluded backfilling of the present alignment. The Highline Canal would be built as an entirely new canal, requir- ing new siphons; drop structures, farm turnouts and other structures. Cost estimates include the installation of siphons of reinforced con- crete pressure pipe under McElmo Creek and Simon Draw. Other struc- tures are a division box at the head of the new Highline Canal, threhr'1561 slide gate check structures, two radial gate check Uv 4 Roche and Davison