Combined sewer overflows (CSO) have been a challenge in St. Louis, where most sewers within the City of St. Louis and some in the surrounding county are combined. Green infrastructure (GI) can provide decentralized storm water control to achieve volume reduction and peak flow attenuation in combined sewers. As part of a Metropolitan St. Louis Sewer District's (MSD) GI pilot program, planter boxes or rain gardens were installed in a Habitat for Humanity community in North St. Louis, Missouri. This research evaluated the impact of these site-scale GI facilities on volume reduction in the combined sewer of the studied area. The research analyzed and compared two study sites: a test site where GIs were installed and a control site where no GIs were installed. The study analyzed measured flows from the combined sewer in each site, rainfall and runoff from each drainage area. In addition, the study estimated flows for each drainage area to verify the quality of the measured data. The volume based on measured flows in the combined sewers was normalized by unit area and unit precipitation for comparative analysis between the test site and the control site. This study revealed that the installed GIs (planter boxes or rain gardens) resulted in approximately 14 gallons per square foot of disconnected impermeable area from each inch of rainfall, and a 60% volume reduction when the test site is compared to the control site. Findings from this study can benefit the engineering planning to develop a cost-effective program for CSO reduction in the St. Louis area.
|Commitee:||Morgan, Susan, Panahshahi, Nader|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 52/02M(E), Masters Abstracts International|
|Subjects:||Civil engineering, Environmental engineering|
|Keywords:||Combined sewer overflow, Green infrastructure, Stormwater runoff|
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