Real-Time Decision Support Reduces CSO Volume By 100 Million Gallons And Capital Needed For Regulatory Compliance

Evansville is located on the north bank of the Ohio River in southwest Indiana. The City’s sewer system, parts of which are more than 100 years old, serves a population of 163,000, with combined sewers making up almost 40 percent of the total sewer area.

These combined sewers are in Evansville’s historic downtown district and tend to experience operational and system capacity problems during heavy rainfall. Because of their inability to transport all the combined sewage to the wastewater treatment plants, Evansville was discharging 1.8 billion gallons of untreated sewage annually across 22 combined sewer overflow (CSO) outfalls into the receiving tributaries of the Ohio River and Pidgeon Creek.