Many small-to-medium-sized communities with combined sewer systems are faced with regulatory mandates to prepare long-term combined sewer overflow (CSO) control plans. By examining wastewater treatment plant flows during dry and wet weather periods, the effectiveness of your CSO control
system in capturing base sanitary flows can be measured. Before embarking on an expensive sewer system modeling project, it is important to examine all of your available data to determine how your system is affected by wet weather events and the probable relative magnitudes of CSO loadings
to area receiving streams. This approach was successfully used in Charleston, West Virginia, to identify a low-cost solution to minimize CSO loadings to the Kanawha River.
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