Changes in Design Standards for Wet Weather Solutions
Abstract:The Metropolitan Sewer District of Greater Cincinnati (MSDGC) serves approximately 800,000 residents in Hamilton County, Ohio. Hamilton County is in the southwest corner of Ohio, bordered on the west by Indiana and the south by the Ohio River. The District covers over 400 square miles, with approximately 3000 miles of sanitary and combined sewers. The MSDGC operates 7 major treatment plants, 140 pumping stations and the floodwall around the City of Cincinnati.
The MSDGC currently has identified ninety sanitary sewer overflows (SSOs). These SSOs are the result of wet weather and inflow and infiltration (I⊘I) entering the sanitary sewer system. The MSDGC has a very aggressive maintenance program to ensure that SSO activity does not result from collection system maintenance issues. (obstructions or blockages)
MSDGC actively maintains the collection system pipes, using various rehabilitation techniques as well as open-cut pipe replacement. However, in the case of replacement sewers, the design standard for new sewers was applied. This standard was based on sewage usage per day using an average of 1000 (g⊘ac⊘d) for infiltration and did not adequately represent the I⊘I contribution in areas with older sanitary sewers; particularly under represented were those areas with SSOs.
This paper will discuss the process to change existing design standards to reflect actual conditions and appropriate flow estimations.
Document Type: Research Article
Publication date: January 1, 2001
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