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<br />. <br /> <br />. <br /> <br />structures, four wasteways and eight pipe road crosslngs. <br />The capacity of the first reach of the new canal would be 146 cubic <br />feet per second (4.1 cubic meters per second), equal to the combined <br />capacities of the existing Highline and Rocky Ford Ditches of 90 cubic <br />feet per second (2.5 cubic meters per second) and 56 cubic feet per <br />second (1.6 cubic meters per second), respectively. The capacity of <br />the last reach would be 38 cubic feet per second (1.1 cubic meters per <br />second), including 25 cubic feet per second (0.7 cubic meters per <br />second) to be delivered over the Aztec Divide to the continuation of <br />the Rocky Ford Canal. Canal capacities are based on the highest re- <br />corded flows in the existing ditches, since there are no anticipated <br />'additional future uses. Conversion to sprinkler irrigation could actu- <br />ally reduce the required capacity of the delivery system. <br />Cost estimates include 39 new culverts to handle cross-drainage of <br />flows ranging from 41 to 2,300 cubic feet per second (1.1 to 64.4 cubic <br />meters per second), the 25-year design floods. Approximately 1.3 miles <br />(2.1 kilometers) of interceptor ditches would need to be cleared and <br />another 1.4 miles (2.6 kilometers) of new interceptor ditches con- <br />st-ructed to prevent _runoff from entering the new canal. <br /> <br />ROCKY FORD PIPE LATERALS -- Water would be delivered to 41 headgates <br />now located along the Rocky Ford Ditch by seven buried. concrete <br />pipelines. The seven laterals would convey a total flow of approxi- <br />mately 56 cubic feet per second (1.6 cubic meters per second). The ca- <br />pacity of the last pipe would be large enough to carry the flow for the <br />last five head gates plus an additional 25 cubic feet per second (0.7 <br />cubic meters per second) that would be delivered over the Aztec Divide. <br /> <br />LONE PINE LATERAL, UPPER SEGMENT -- The upper or more northern segment <br />that would be cost-effective to line is 3.5 miles (5.6 kilometers) <br />long, with a capacity of 162 cubic feet per second (4.5 cubic meters <br />per second) over the first 2.1 miles (3.4 kilometers) and 128 cubic <br />feet per second (3.6 cubic meters per second) over the remainder. This <br />segment would be lined in its existing alignment. Cost estimates were <br />made for earth lining, with gravel riprap along the canal sides to pro- <br />tect against erosion. The existing prism would be reshaped to form a <br />standard Reclamation-required prism, which would have a slope less than <br />the recommended maximum slope for earth-lining. <br /> <br />LONE PINE LATERAL, LOWER SEGMENT -- The lower or southern segment that <br />would be cost-effective to line is 2.8 miles (4.5 kilometers) long and <br />has capacities of 71 cubic feet per second (2.0 cubic meters per <br />second) over 2.4 miles (3.9 kilometers) and 56 cubic feet per second <br />(1.6 cubic meters per second) over the last 0.4 miles (0.6 <br />kilometers). It would also be earth-lined along its existing <br />alignment, with gravel riprap on the canal sides to protect against <br />erosion. The existing prism would be reshaped and given a proper <br />slope. <br /> <br />. <br /> <br />UPPER HERMANA LA~ERAL -- The first 2.9 miles (4.7 kilometers) of the <br />Upper Hermana Lateral would be earth-lined. The first 2.5 miles (4.0 <br />kilometers) has a capacity of 110 cubic feet per second (3.1 cubic <br />meters per second); the last portion has a capacity of 92 cubic feet <br />per second (2.6 cubic meters per second). The slope would be reduced <br /> <br />:-,i"1 r;r.0 <br />'_' ,j ,.~..,v "- <br /> <br />5 <br /> <br />Roche and Davison <br />