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Rainbow Municipal Water District

San Diego, California


To ensure the continued supply of safe drinking water for a community near San Diego, CA, a 30-year-old outfall vent pipe needed rehabilitation—fast.


While completing installation of a new lining in a critical concrete and asphaltic lined raw water reservoir, Rainbow Water District Engineers realized that the vent for the outfall pipe also needed rehabilitation. With the water main located beneath a 45-degree concrete slope, installation of the cured-in-place pipe liner would be difficult. And because the reservoir contained drinking water, an NSF-approved solution was required.


Because the pipe was expected to perform for decades with no further maintenance, SAK recommended a proven, fully structural Class IV lining solution with the installation of new valve works. SAK employed trenchless technology to complete the project in just one day.

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