The Mariah Combined Sewer Overflow (CSO) Storage Basins are one of five sewer improvement projects designed and constructed as part of the Columbus City Utilities’ Combined Sewer Overflow Long Term Control Plan (LTCP).

The plan recommended construction of wet-weather storage basins located at a City-owned site formerly occupied by wastewater storage lagoons for a meat packing company. The exisitng sludge was removed and the lagoons were converted into two CSO storage basins to accommodate 18 million-gallons of storage, floating aeration, and a chlorine disinfection system.

The unique basin design achieves disinfection with an internal chlorine contact tank that includes mixers, a chlorine induction system, and dechlorination. The basins were reconstructed with a concrete bottom and a flexible side liner.

Flow to the basins is provided by the new Haw Creek Headworks and Pumping Station.

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