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<br />. <br /> <br />/'() <br />w <br />CJ <br />....... <br /> <br />. <br /> <br />. <br /> <br />II. CANAL LINING <br /> <br />There is enough water currently lost through seepage <br /> <br />along a IS-mile reach of the All-American Canal that, if <br /> <br />salvaged by lining the reach, would provide more than <br /> <br />enough water to replace the reject stream. <br /> <br />Since <br /> <br />agricultural requirements in the Imperial Valley prevent <br />shutting down the canal to install a lining, and consid- <br />ering that lining an operational canal is as yet economi- <br />cally infeasible, an entirely new reach would have to be <br /> <br />constructed to replace the old unlined reach. This <br />alternative would have a total investment cost of <br /> <br />$35,720,000 and would provide 42,000 acre-feet of reject <br /> <br />stream replacement water at a cost of $47.50 per acre- <br /> <br />foot. Negotiations with the State of California and the <br /> <br />Imperial Irrigation District would be required. <br /> <br />Description <br /> <br />All canals normally lose small percentages of water through <br /> <br />evaporation and, most often in unlined canals, seepage; however, in <br /> <br />large canals even a small percentage loss can constitute a large <br /> <br />quantity of water on an annual basis. Three canals within the project <br /> <br />area (see Plate No. 1) have been identified as having large seepage <br /> <br />losses: the Coachella Canal, the Gila Gravity Main Canal, and the <br /> <br />All-American Canal. <br /> <br />It has already been established that a considerable amount of <br /> <br />water could be salvaged by lining the 86-mile unlined reach of the <br /> <br />7 <br />