Innumerable joints in a sewer main lost their integrity, threatening leakage from miles of pipe beneath a scenic canyon in Southern California. The joints needed to be repaired without tearing up the canyon floor and disturbing riparian habitat.
The San Diego office of GHD, a multinational professional services firm, engineered and oversaw the rehabilitation project. Its oversight involved decisions that delicately balanced construction solutions and environmental preservation. In the end, it all worked out, but not in a purely linear fashion.
Initial failure
The Rose Canyon trunk sewer line, constructed in 1996, is a reinforced concrete structure with a PVC liner.
