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<br /> <br />04,*, <br />. ....rtll;t <br /> <br />. <br /> <br />. <br /> <br />other tributaries <br /> <br />other smaller tributaries in need of ch~nel restoration <br />work are La Jara, Alamosa, and Rock' Creeks. The estimated channel <br />capacity requirements are 50 cubic feet per second for each stream. <br />The reach of channel restoration for La Jara Creek "would be its 1.8 <br />river miles from U.S. Highway 285 to the Rio Grande, with a restored <br />channel. length of 14.3 miles. Work on Alamosa Creek would extend <br />,for II miles from U.S. Highway 285 to the Rio Grande. The length <br />of channel restoration for Rock Creek is 21.7 miles from its inter- <br />section, with the Bowen Drain to the Rio Grande. The restored channel <br />length would be about 13.5 miles. The plan for Rock Creek would also <br />include the rehabil.itation of the Bowen Drain from Rock Creek to the <br />Rio Grande because that drain is essentially a part of the Rock Creek <br />system. <br /> <br />F'-, <br /> <br />Riverside canals would be provided, throughout the lengths <br />for the three streams, and maintenance roads would be provided adja- <br />cent to the channels. Two concrete _county road bridges would be <br />required for each stream, and riprap would be provided as required. <br />The estimated cost of'channel restoration for the three streams is <br />$2,260,000; , <br /> <br />Costs and benefits <br /> <br />The estimated construction cost for restoration of the five <br />tributary channels is $6,279,000. The estimated anIlUal operation, <br />maintenance, and replacement costs amount to $82,000. This channel <br />work would result in an average annual reduction in water losses of <br />12,000 acre-feet. The project would be economicallyfeasib1e with <br />a benefit-cost ratio of 2.34 to 1. <br /> <br />5 <br />