From Grey to Green, and Everything In-Between: A CSO Case Study

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Abstract:

Metropolitan Sewer District of Greater Cincinnati (MSDGC) has been examining the potential of utilizing green infrastructure techniques within defined watershed areas, to reduce combined sewer overflows (CSO). Potential CSO control techniques are screened and those appropriate for project location and goals are selected for detailed analysis. An Alternatives Comparison Tool (ACT) was developed using these techniques to examine many different combinations which meet MSDGC-s goals. The ACT was then used to determine which combination of techniques accomplishes MSDGC-s goals most effectively.

Partial separation of the CSO watershed utilizing stream daylighting in combination with conventional stormsewer construction and bypassing the existing pump station with a new gravity interceptor and CSO regulator presented the greatest overall benefit. This combination of components provides environmental benefits of additional terrestrial and aquatic habitat while improving ground and surface water quality. It also provides the social benefit of beautifying the community while avoiding major private property impacts.

Keywords: Combined sewer overflow; alternatives analysis; infrastructure; stream daylighting; watershed

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864711802764986

Publication date: January 1, 2011

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  • 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 These proceedings are not peer reviewed.

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