Skip to main content

Installing 18-Inch Pipe Inside a 6-Inch Pipe? The Wildcat Creek Trunk Sewer Relocation Project

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


This paper details the West Valley Sanitation District's efforts to plan, design and construct an 16-inch ID (18-inch OD) HDPE sanitary trunk sewer using the pipe reaming method to replace existing 6-inch and 8-inch VCP sanitary sewer, and using the horizontal directional drilling method where no sewer existed. The paper also provides an overview of a few critical lessons learned.

The purpose of the Wildcat Creek Trunk Sewer Relocation Project was to eliminate the need for maintaining a segment of trunk sewer that ran through a local junior high school site. The concept was to relocate a portion of the Wildcat Creek Trunk Sewer and connect it to the District's Montpere Way Trunk Sewer system.

Recognizing conventional open-trench construction would cause major traffic havoc to the community, District staff decided to specify several alternate trenchless construction methods (pipe bursting, pipe reaming, and horizontal directional drilling) and HDPE pipe for this project. The project called for the construction of approximately 5883 LF of 16-inch ID sewer line consisting of the installation of 2,630 LF of new 16-inch ID sewer line, replacing 1,886 LF of 8- inch VCP with new 16-inch ID sewer, and replacing 1,367 LF of 6-inch VCP with new 16-inch ID sewer. Depth of the sewer varied from 8' to 21'.

The project was the first District project completed utilizing the pipe reaming and horizontal directional drilling methods. Both methods proved to be viable options that have significant advantages compared to conventional open-trench construction when upsizing existing gravity sewer lines or installing new gravity sewer lines in highly developed areas.

Document Type: Research Article


Publication date: 2003-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more