Last Updated: 2009-11-18

CSO Peripheral In-Line Flow EQ at Oakwood

The CSO Peripheral In-Line Flow EQ at Oakwood project is complete. The city used Recovery Act funding to complete the Peripheral In-Line Equalization at Oakwood Project (Special Order Requirement Number 9). This project constructed an in-line storage facility and a solids and floatable control regulator near an existing Combined Sewer Overflow (CSO) outfall. This project will allow combined sewage in excess of the capacity of the existing conveyance system to be captured and stored in the existing oversized outfall pipes, then conveyed to the treatment plant once the CSO event subsides and the conveyance and treatment capacities become available to take the flow. The project also included rehabilitation of approximately 4,000 linear feet of existing intercepting pipe.

The in-line flow equalization will attenuate peak combined sewer flows, which provides a relatively constant flow into the treatment plant and thus reduces the size and cost of treatment facilities. The solids and floatable control regulator structure will improve the aesthetic quality of discharge into the receiving water body by providing retention of solids and floatables during wet weather overflow events. Solids and floatables that do not readily pass into the sewer main to the treatment plant during high flow will be held in the concrete retention structure by underflow baffles and bar screens, until the rain event has subsided and then they will be transported to the wastewater treatment plant with the dry weather flow. $ 1,465,700 in Recovery Act funds were used to complete this project.

Contact Information:

City of Richmond
900 E. Broad St., Suite 1100
Richmond, VA
23219 USA
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