A LOOK AT THE PERFORMANCE OF COMBINED SEWER OVERFLOW DETENTION BASINS
Abstract:Combined Sewer Overflows (CSOs) have been identified as major sources of pollution in the United States. Michigan Department of Environmental Quality (MDEQ) in 1989 formally acknowledged this problem and issued NPDES Permits to communities with CSO outfalls to the Rouge River. In these permits, MDEQ outlined its definition of adequate treatment of CSOs, which would have resulted in the construction of large expensive CSO treatment basins. As part of the settlement of the resulting contested case, the communities agreed to design and build nine CSO facilities. As part of this agreement, the Detroit Water and Sewerage Department (DWSD) agreed to construct three of the nine basins. These are; Seven Mile, Puritan-Fenkell and Hubbell-Southfield CSO basins.
These basins are 2.8 MG, 3.4 MG and 22 MG respectively. The design of the CSO basins was developed using available hydrologic information, with the intention of performing intensive post project monitoring to establish the performance of the basins. DWSD has been performing intense sampling and monitoring of these three facilities since November 1999.
This paper will present CSO pollutant data collected during this study, with emphasis on new insights gained as a result of the data collection and analysis by DWSD. The paper will concentrate on the following areas: ramifications of in-system storage provided by the facility, quantification of “sanitary trash”, facility operation and maintenance staffing recommendations.
Document Type: Research Article
Publication date: January 1, 2002
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