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<br />. <br /> <br />exist whereby a canal could be lined while still in service, but the <br /> <br />effectiveness must be demonstrated, and apparently the costs are <br />quite high as compared to building an entirely new lined reach parallel <br /> <br />l\) <br />W to the old unlined reach of canal needing the lining. <br />o <br />cr, <br /> <br />Plan <br /> <br />Two ponding tests were performed on the All-American Canal to <br /> <br />determine the amount of water lost by seepage. One test was per- <br />formed on a section of the canal between Pilot Knob and Drop 1; the <br /> <br />other was done by ponding water between the Wistaria Check and the <br /> <br />West Side Main Canal. These tests and Imperial I rrigation District <br /> <br />flow measurements resulted in the water salvage estimates shown in <br /> <br />Table 1. <br /> <br />. <br /> <br />These estimates indicate that a new lined reach between Pilot <br /> <br />Knob and Drop 1 would be the only reach capable of providing the <br /> <br />required 42,000 acre-feet of water annually. The entire reach between <br /> <br />Pilot Knob and Drop 1 would be replaced since it would be impractical <br /> <br />to build a new lined reach just long enough to salvage 42,000 acre-feet <br /> <br />of water (present structures on the existing canal, possible "tie-in" <br /> <br />points between the old and new reaches, and topography would gener- <br /> <br />ally dictate the actual length of the new canal). The 48,000 acre-feet <br /> <br />of water which can be expected to be salvaged from this reach would <br />be 6,000 acre-feet in excess of that required to replace the reject <br /> <br />stream, so this additional water will be treated as an economic benefit. <br /> <br />. <br /> <br />The new lined reach would be 15.4 miles long, have a capacity <br />of 9,155 ft3/s, lie close to the Mexican border, and save approximately <br /> <br />9 <br />