Integrated Pipeline Project (IPL) Segments 12, 13, 14
Tarrant County, TX

Huebner Creek Regional Stormwater Facility at Prue Road | San Antonio, TX

The population of the DFW Metroplex is expected to surpass 13 million people by the year 2060.  The Integrated Pipeline (IPL) project will transport water via a 350 MGD raw water transmission pipeline system in order to meet those increased demands.  This project is being jointly funded by the Tarrant Regional Water District (TRWD) and Dallas Water Utilities (DWU), saving taxpayers millions of dollars  and exhibiting a commitment by the region’s two largest water providers to work together to meet the region’s future water needs. Once completed, the pipeline will transport raw water from Lake Palestine, Cedar Creek Reservoir and Richland-Chambers Reservoir back to the TRWD and Dallas service areas.  Approximately 150 miles of pipeline and various ancillary stations and apparatus will comprise the completed system. The pipeline is spilt into 13 separate sections/projects, with an average pipeline section length of 13 miles. In addition to the pipeline projects, the completed system includes six pump stations (three lake pump stations and three booster pump stations) and associated electrical substation and telecommunications project.  Construction is expected to be complete by 2020.


CAS provided preliminary engineering services, final design, and construction phase services for 13 tunnels (12 crossings for TxDOT highways, FM roads and Railroads, and 1 stream crossing) associated with the design of the 27 miles of 108-inch pipeline (Sections 12, 13, and 14).


Design services included design and preparation of final tunnel documents for the IPL project that included tunnel support structural calculations such as tunnel liner plate and steel rib calculations, tunnel design drawings, technical specifications, and opinion of probable construction costs for the 12 tunnels listed in the table below.  Various design components taken into consideration included blow-off valve manways, utility relocations at shaft sites, tunnel minimum covers, external pressures, and tunnel liner plates’ joint strength, minimum stiff ness, and buckling strength. CAS also prepared tunnel settlement calculations for meeting the design criteria provided by the IPL management program.  


Currently, CAS Consulting is providing construction phase services for the sections of our design work. As of today, we have worked on the following: Mountain Creek, US 287, US 67 & BNSF Railroad, BNSF Railroad Spur, and FM 875. Each of these are 12-foot tunnels, with 108-inch diameter pipelines. Tasks on these sections included submittal review, weekly site visits, on-site meetings with subcontractors, and monthly progress meetings with the program staff .

Project Cost: $12M (Combined Tunnel Construction)

Owner: Tarrant Regional Water District