Underwater PVC Lining Coachella Canal Problem: A nine-foot-deep canal, built in 1942 in sandy desert soil now leaks up to 115,000 acre-feet annually - enough fresh water for up to 150,000 households. The canal needed relining but the project had to be accomplished without draining the water. Solution: Develop equipment that trims and grades the canal and then lines it in one multi-layered process with a polyviny

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