Wet Well Wonder in a Deep Sewer Tunnel
System is designed to intercept wet weather overflows & requires powerful pumps
Designed to reduce environmental impacts resulting from combined sewer overflows (CSOs) in Columbus, Ohio, the Olentangy-Scioto-Interceptor-Sewer Augmentation Relief Sewer (OARS) will intercept wet weather overflows that currently empty into the Scioto River and instead carry the flows to the city’s Jackson Pike and Southerly wastewater treatment plants.
The overall length of the OARS tunnel is just less than four-and-a-half miles, and it includes three relief structures that divert wet weather combined sewer flow to the OARS tunnel. It is sized to provide adequate conveyance capacity through 2047 for all storms contained within the typical year as defined by the city. The OARS tunnel ends at the OARS Diversion Structure just north of the Jackson Pike wastewater treatment plant, which serves as the pump station wet well.
Among the most interesting components of the OARS project is a 215-ft-deep, 60-million-gal-per-day (mgd)-capacity pumping system and a 185-ft-deep screening system. The OARS pumping system consists of multiple pumps that can handle enough flow to dewater the tunnel within two days of a large flow event.
Date: December 7, 2017
Image: Google Images
Coordinator: EnvGuide Team
Source: https://www.wwdmag.com/channel/casestudies/wet-well-wonder-deep-sewer-tunnel