Investigate–Design–Build Solves Suspected Leak in a 72-in. PCCP Transmission Main under the Trinity River in Dallas, TX

The City of Dallas, Dallas Water Utilities (DWU) continued its comprehensive condition assessment program in 2022 by performing electromagnetic and leak detection inspection of one of its critical transmission mains, the Cedar Crest Water Transmission Main, which detected a large leak in the vicinity of one of the bends within the encased portion of the pipeline that crosses under the Trinity River. DWU retained the design–build team of Structural Technologies (Structural) and their subconsultant, Simpson Gumpertz & Heger Inc. (SGH) to investigate and repair the subject portion of the pipeline under the river using Carbon Fiber Reinforced Polymer (CFRP) lining. This paper discusses the criticality of the pipeline, investigation, repair approach, and challenges encountered during CFRP repair construction, such as a major flood event.