Relining Projects

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Relining Projects

Major initiative improves pipeline integrity

The Water Authority’s multi-decade Pipeline Relining Project made impressive headway with the completion of two major projects near Miramar Reservoir and Lake Murray, and preparations for another large-scale relining project in the South Bay. Relining with steel is 40 percent to 60 percent cheaper than replacing pipe, and it is less disruptive to the environment and surrounding communities.

The relining of about three miles of Pipelines 3 and 4 from Miramar Hill to Scripps Ranch finished in the fall of 2012. Crews faced challenging circumstances, including steep slopes and a narrow pipeline corridor near several homes. The conditions required effective communication with residents, along with the restoration of private streets and common areas to pre-construction conditions.

To the south, the Mission Trails to Lake Murray Pipeline Relining Project will lengthen the service life of the 6-foot diameter pipe under Jackson Drive by at least 75 years.  Construction crews started working in August, and finished relining about 3.5 miles of pipe ahead of schedule in May.

Up next is the Sweetwater to Lower Otay Relining Project, which involves upgrading approximately 5.4 miles of large-diameter pipeline in Bonita and eastern Chula Vista. Once that project is complete, the Water Authority will have rehabilitated nearly half of its 82.5 miles of pre-stressed concrete cylinder pipe.


Learn more about the latest progress on the Water Authority’s Pipeline Relining Program and see how the liners are actually inserted underground by watching this brief video. 

Pipeline Relining: Moving Ahead