Skip to main content

GLENCOE RAIN GARDEN: SUCCESSFUL MANAGEMENT OF COMBINED SEWER FLOWS

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

Abstract:

Because Green Solution facilities reduce both peak flows and flow volume, they are attractive options to manage stormwater issues in the combined sewer system such as combined sewer overflows and basement sewer backups.

The Glencoe Rain Garden is a vegetated infiltration basin constructed in 2003 to protect a residential area suffering from severe and frequent basement sewer backups and to reduce combined sewer volumes downstream. The facility is approximately 2,000 ft2 and manages roughly 35,000 ft2 of impervious drainage. Monitoring began before construction in August 2003. Peak flow and flow volumes are compared before and after Rain Garden construction.

In the 9 months prior to construction, peak flows in the combined sewer exceeded 0.5 cfs – the design threshold to protect downstream properties from basement sewer backups – during 4 events. In the 48 months after construction, no events have exceeded 0.5 cfs. This was despite the occurrence of storms of greater intensity since the facility was completed. Two flow tests were performed to simulate 25-year peak flows with a peak outflow was 0.6 cfs – slightly above the benchmark but within the error tolerance.

Flow volume reduction was significant, with an average annual retention of 88% over the first four years. Retentions for storm events closest to the CSO design storm appeared to be around 80% retention. One conservative flow test was also done that retained 56%.

While there are some uncertainties – performance over time and performance for naturally occurring, large storm events – Rain Gardens and other infiltration facilities appear to be very useful and economical options for managing runoff peak flow and volume. Monitoring will continue to improve the accuracy of the results and to track changes in results over time.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864708790894782

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
wef/wefproc/2008/00002008/00000006/art00064
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

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
X
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