Interceptor Master Planning Produces a Phased Program

Laying pipe along Trinity Blvd. for the 900 LF project.

Throughout the system, corrosion was identified to be severe, with wall thickness loss up to 1.5 inches in multiple sections of pipe, primarily at the pipe crown.

During the preliminary design stage, erosion concerns were identified and pipeline channel stabilization recommendations were included.

7 phase
improvement program
90 %
interceptor identified for rehabilitation
9,000 LF
pipe with > 2 years of RUL

Constructed in the early 1970’s, the Walker-Calloway Branch Outfall Trunk Sewer System (W-C) is owned and maintained by the Trinity River Authority (TRA). Flows discharge into the 96-inch City of Fort Worth Village Creek outfall where collapses, surcharging, and backups were recurring. This multi-phase program began with a condition and capacity assessment to understand current conditions, the remaining useful life (RUL) of the pipe, risks of failure, and project future capacity needs for the 2040 planning horizon.

The W-C improvement program structured recommended repairs into seven phases. The Preliminary Design Report (PDR) identified that approximately 90% of the system required rehabilitation, with the majority of work recommended to be rehabilitated by trenchless methods. 

 

Project Metrics

  • The multi-sensor pipe inspections estimated that 48% of the interceptor had an RUL of less than two years. This was a critical factor for prioritizing repairs.
  • Three sections of the interceptor are being upsized due to a low point at a creek crossing. CIPP rehabilitation was selected as the best repair method for the remaining sections.
  • Erosion issues for a 42-inch segment of the pipe was exposed at a creek crossing and required channel stabilization measures.
  • Phase 1 design involved re-routing 4,463 LF of 42-inch pipe and rehabilitating the meter station. Mag meters were installed to measure flows at the meter station.
  • CIPP is being used to improve the Phase 2 and 3 (6,454 LF of 27- to 42-inch pipe) sections and requires extensive bypass pumping (7,000 LF).


Project Leaders

Daniel Jackson, PE
Project Manager


Services
  • Trunk sewer area master planning
  • Engineering analysis and condition assessment
  • Multi-sensor pipe inspections (7,891 LF of 24- to 42-inch pipe) for RUL assessments
  • Hydraulic modeling to assess future capacity needs
  • Design (17,311 LF 24- to 42-inch interceptor)
  • Bypass pumping planning
Client

Trinity River Authority (TRA)

Location

Arlington, Texas

Service Period

2012 — 2020


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