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The Acacia Park Retention Treatment Basin (RTB) was constructed as part of an $82 million national demonstration project. The demonstration project is a three-phase project aimed at eliminating combined sewage overflows (CSO) in the Rouge River watershed. The Acacia Park RTB was constructed under the second phase of the project, which implemented CSO controls. Phase I included monitoring and optimizing existing combined sewer systems and planning for CSO controls. Phase III evaluates the results of Phase II CSO controls and initiates further controls (if necessary) to meet water quality standards.

The Acacia Park RTB services an 816-acre watershed, treating approximately 150 million gallons of CSO annually, of which 50 million gallons are discharged to the Rouge River. The RTB has a capacity of 4.0 million gallons and is 206' x 140' x 20'. The facility is designed to provide 30 minutes detention of the 1-year, 1-hour storm (1.0”).

The RTB receives gravity flow from a 10' combined sewer. Two separate cells are sequentially filled, as the facility provides disinfection, settling and skimming. Flow exceeding the storage capacity of the two cells is screened through 3/4” x 3-3/4” openings and overflows via weir troughs to an effluent channel that discharges to the Rouge River. Retained flow in the RTB is pumped back into the Evergreen Interceptor for treatment at the Detroit POTW. After the basin is dewatered, a pivoting trough flushing system is used to flush any remaining sediment from the tank bottom to the interceptor sewer.

Construction of the RTB was completed in February 1997. Located within the Village of Beverly Hills Nature Preserve, construction of the RTB included the re-establishment of a “Relic Prairie” meadow and mitigation of 0.7 acres of wetland. The siting of the facility allowed for several unique design characteristics. An example of this is the control building architecture that resembles a stable, thereby blending with the aesthetics of the site.

The Acacia Park instrumentation and controls are relayed into Oakland County's Supervisory Control and Data Acquisition (SCADA) system. This allows the County to monitor the facility from a remote location and optimally operate the facility.

Oakland County Drain Commissioner

Beverly Hills, Michigan


1997 Quality of Life Award -


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