DLZ Corporation
Burns Harbor, IN 46304
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Olentangy Scioto Interceptor Sewer Augmentation and Relief Sewer (OARS)
Project Information
- Project Location:
- Columbus, OH
- Status:
- Completed
- Structure Type:
- Sewage / Water Treatment Plant
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- Architect:
- General Contractor:
Scope Of Work
The OARS project consists of the construction of a 20-foot diameter, 170-foot deep tunnel that provides relief to the existing OSIS from just north of the Arena District in downtown Columbus to the Jackson Pike Waste Water Treatment Plant (about 23,300 feet in total length).
The OARS tunnel is sized to provide adequate conveyance capacity through the year 2047 for all storms contained within the typical year as defined in the Wet Weather Management Plan. The sewer will also provide some inline storage during critical periods to eliminate combined sewer overflows from the 12 regulators located along the OSIS in downtown Columbus.
The Level of Service will be equivalent to a 10-year level of wet weather flow protection. Once the OARS is operational, more than a billion gallons of combined sewage overflows will be treated instead of discharged to the Scioto River each year. The 170-foot depth allows for the tunnel to be constructed in competent rock, reducing risks associated with construction.
Special drop structures are required to direct flow from shallow sewers to the deep tunnel. Tangential inlets with deaeration chambers will be utilized to dissipate energy and minimize air entry into the tunnel. Tunnel surge relief facilities will also be provided at several shaft structures.
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