Skip to main content


Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


Increasing emphasis on eliminating combined sewer overflow (CSO) and sanitary sewer overflow (SSO) will expand the need to construct new sanitary sewers in congested urban areas. Recent advances in the pilot tube system of microtunneling (PTSM), offer several advantages over other available systems for constructing 6-inch to 18-inch inside diameter sewers in areas where there is congestion, where the sewers are deep or where it is desired to minimize disruption at the ground surface. PTSM uses 8-foot diameter or smaller construction shafts, allowing a small surface footprint. Theodolite guidance produces better than plus or minus 0.1 foot line and grade accuracy anywhere along the finished sewer. Less sophisticated equipment and specialized construction techniques make the system cost effective. The City of Cape Girardeau, Missouri saved about 15 percent over open cut construction by allowing PTSM installation of about 40,000 feet of sewer.

Features of the method may make it possible to modify some of the standard approaches to sewer project location and construction. Sewer separation becomes a more feasible alternative for addressing CSO. The small diameter construction shafts limit impacts on traffic, perhaps making it feasible to construct more sewers in public right-of-way. Construction on public property can minimize or eliminate the need for permanent and temporary easements, a time consuming and sometimes costly sewer project activity. Significant design and construction dollars can be saved by allowing the construction contractor to determine the final location of manholes and the final elevation of sewer inverts. PTSM is a new tool in the sewer construction toolbox.

Document Type: Research Article


Publication date: 2000-01-01

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 These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree 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