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<br />. <br /> <br />Coachella Canal. Public Law 93-320 authorized lining the first 49 <br /> <br />miles of the canal, but also specified that Federal use of the salvaged <br /> <br />N <br />W <br />o <br />C.)t <br /> <br />water would be for the specific purpose of meeting the salinity control <br /> <br />objectives of Minute No. 242 of the International Boundary and Water <br /> <br />Commission during the interim period subsequent to completion of the <br /> <br />project and prior to an inability of Colorado River main stream <br /> <br />deliveries to meet existing California or Federal water rights within <br /> <br />the State. No water from this source, then (the first 49 miles), <br /> <br />would be available for permanent reject stream replacement. <br /> <br />Salvage potential in the remaining 37 miles has been estimated to <br /> <br />be about 12,000 acre-feet annually. Since this is not enough water to <br /> <br />replace the reject stream, and considering the length of the canal to <br /> <br />. <br /> <br />be lined, it appears that this would not be an adequate or cost <br /> <br />effective method of water salvage. <br /> <br />The Gila Gravity Main Canal is an earth-lined canal which has <br /> <br />been resealed in some reaches. Data from Geological Survey gages <br /> <br />indicate total losses of around 20,000 acre-feet per year. It is doubt- <br /> <br />ful, considering that the canal has an earth lining, that a concrete <br /> <br />lining would conserve more than 10,000 acre-feet per year. Since <br /> <br />this amount would not meet the requirements necessary for reject <br /> <br />stream replacement, it was not considered further. <br /> <br />Studies of losses from the All-American Canal indicate that sub- <br /> <br />stantial amounts of water could be salvaged at a reasonable cost. <br /> <br />One major problem affecting lining the All-American Canal, however, <br /> <br />is that it cannot, due to agricultural water requirements in the <br /> <br />. <br /> <br />Imperial Valley, be shut down to install the lining. Technology does <br /> <br />8 <br />