Skip to main content

Application of Modeling shows that Downspout Disconnect Program Can Eliminate Sensitive CSO

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


Field investigations in the Rockford Road service area of Wilmington revealed four engineered interconnections between a sanitary and storm sewer. These interconnections cause sanitary sewage to be diverted into the storm sewer system during precipitation events creating a “Combined Sewer Overflow” (CSO); discharging to the Brandywine Creek upstream of the City's water supply intake. Consistent with the objectives of the National CSO Policy for addressing CSOs in sensitive areas, a sewer separation project was determined to be necessary to eliminate overflows.

For this project MOUSE, by the Danish Hydraulic Institute, was used to examine alternative separation approaches. The results of the 10-year model simulation were applied to the intensity-duration-frequency curves for the area to derive a correlation between the percentage of rooftop area disconnected and the level of protection against basement flooding provided. It was concluded that a roof leader separation program could be effective in eliminating the CSO for the most storm events.

Document Type: Research Article


Publication date: January 1, 2008

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 These proceedings are not peer reviewed.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
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