Skip to main content

A Tale of Two Tunnels

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


In late 2005, the Milwaukee Metropolitan Sewerage District (MMSD) began operation of the Northwest Side Relief Sewer. This is a 20 foot diameter bored tunnel, 38,000 feet long, and was designed to provide hydraulic grade line relief to upstream sewers and to provide storage for excess sanitary sewage flows to benefit the entire service area.

MMSD has been operating a 405 million gallon capacity deep tunnel system (called the Inline Storage System, or ISS) for more than 12 years. This network of 19 miles of underground tunnel storageprovides relief for both the excess combined sewage and excess sanitary sewage that enter the collection system during rain events.

These two facilities operate together during large rain events to protect regional water resources. The strategies of operation for both facilities must be designed to meet the objectives of improved water quality and the reduction of flooding occurrences within the district's service area.

Document Type: Research Article


Publication date: January 1, 2006

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 These proceedings are not peer reviewed.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 Content
Free content
New Content
New content
Open Access Content
Open access content
Partial Open Access Content
Partial Open access content
Subscribed Content
Subscribed content
Free Trial 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