Southerly Main Drain Alternative Pipe Route

SoutherlySz.jpg Southerly Wastewater Treatment Plant (SWWTP)
CIP 650352-100007

Wastewater plants have a Main Drain that captures all residual wastewater and directs it back to the head of the plant for further processing. Internal building drains, the contents of tanks being emptied, and wastewater that is skimmed from the surface of various solids removal processes are examples of flows that are directed to the Main Drain. 

When large wet weather events occur, gates at the head of the plant must control flow into the plant. At SWWTP, those gates (located in the Influent Junction Chamber (IJC)) also protected the Main Drain from inundation and protected the plant's buildings, structures, and processes from Main Drain backflows. Those gates deteriorated and could no longer control flow into the plant or prevent Main Drain inundation; so, those gates were removed as part of Sanitary Sewer Engineering Section's (SSES) CIP 650860-116300 (Second Barrel Interconnector Augmentation). In order to prevent inundation of the Main Drain system and back-ups into plant processes, structures, and buildings, this project will construct a flow diversion structure within the plant's Main Drain and an alternative pipe so that Main Drain flows can be redirected to the Raw Sewage Pump Building during large wet weather high flow events. This project will also install modulating actuators on the bar rack gates within the Raw Sewage Pump Building (RSP) so that plant's influent flows can be controlled.

Construction is currently scheduled to begin in late 2024 and will be completed in 2026.

Financing for this contract is being provided through a below market-rate loan through the OEPA’s Water Pollution Control Loan Fund (WPCLF) Program. 

The Ohio EPA will be conducting a Limited Environmental Review (LER) for this project. LER and the letter of "Notice of Issuance of a Final Finding of No Significant Impact to All Interested Citizens, Organizations and Government Agencies" will be accessible via this website.

For questions specific to this project, please contact Project Manager, Troy K. Branson, PE at 614-645-7423 or