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Some cities, such as Fort Wayne, collect both rainwater runoff and sanitary wastewater in the same set of sewer pipes. These are called "combined sewers." Combined sewers can create water quality challenges for cities because of the additional volume of rain water (stormwater) entering the pipe system during large rain events can reduce the capacity of the pipe system to carry sewage to the treatment plant. City Utilities is committed to updating and improving its sewer system to meet federal mandates and protect river water quality by significantly reducing the number of combined sewer overflow events (CSOs).
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