Combined Sewer Overflow Facilities Click here to return to the CSO Facilities page. Hubbell-Southfield CSO Basin DWSD’s Hubbell-Southfield CSO Basin became operational in August 1999. It is located between the Southfield Freeway and Rotunda Drive, next to the Tournament Players Championship Golf Course (TPC) in Dearborn. It is the largest of the Department’s three CSO basins and is one of the largest in Michigan. The Hubbell-Southfield’s design includes a unique shunt channel that allowed wastewater to continue flowing to the Wastewater Treatment Plant during basin construction. In the completed basin, the shunt channel fulfills two important roles by one, preventing Negative Treatment, and two, by allowing the basin to actually exceed its design capacity during periods of maximum wastewater flow that occurs in the heaviest storms. Negative treatment is a phenomenon that takes place when swiftly-flowing wastewater causes settled solids to become re-suspended, creating a mixture that’s more concentrated and toxic than incoming wastewater. This 22-million gallon facility eliminates one major CSO discharge outfall to the Rouge River.
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