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Final Program


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Collections: Leadership

SacSewer's Lower Central Interceptor Rehabilitation Project: Design Challenges in a Very Large, Cutting-Edge Pipeline Rehabilitation

Thursday, April 9, 2026
9:10 AM - 10:00 AM PT
Location: B 2
Presentation Description: The Sacramento Area Sewer District (SacSewer) is beginning construction of one of the largest pipeline rehabilitation projects ever: the Lower Central Interceptor Rehabilitation Project, located here in Sacramento, California.
Comprised of nearly 6.5 miles of 84- to 120-inch Cured in Place Pipe (CIPP) lining, the Project is pushing the limits of rehabilitation technology. Attendees will learn about the unique challenges posed by the calcareous concrete pipe originally used for construction of the Lower Central Interceptor and the condition assessment efforts that identified the need for the project. The presentation will discuss how and why CIPP was selected as the rehab method, the many challenges designing very large CIPP liners using ASCE MOP 145, the extensive and complex bypass system needed to do the work, and the many other hurdles that the design team needed to overcome, including rehabilitation of large sewer structures along the alignment, working with property owners, coordination with treatment plant operations, project permitting and environmental restrictions in the Bufferlands, a natural open space surrounding SacSewer’s EchoWater Resource Recovery Facility in Elk Grove, CA, and more.

Learning Objectives:

  • understand the challenges of designing a large-diameter sewer rehabilitation project
  • understand the difficulties of a long, linear project crossing through multiple jurisdictions and with multiple stakeholders and the importance and complexity of designing flow bypass for a large sewer interceptor
  • better tackle the design of their own large sewer rehab projects