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project5
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Combined Sewer Overflow
Truman School

New Haven, CT

This structure is to divert excess sewage to the 5 million gallon storage tank at times of heavy flow. Then, as the treatment plant can process it, the sewage is gradually introduced back into the system. The diversion structure is under Ella Grasso Boulevard, a heavily travelled street. The project was designed to be completed in stages. BAC devised a plan in which we could restore traffic each night by using Mabey bridges to cover the opening in the street. We were allowed to perform the work in one stage and accelerated the schedule. The project involved tapping into a live 6 foot diameter sewer line and installing a mechanical weir that would trip under high flow conditions to divert sewage to the storage tank. The photos show placing sheetpiling under overhead electrical lines, piping to divert the sewage temporarily, and a Mabey bridge covering part of the opening in the street.
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