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Published on May 18, 2010
CSO stands for combined sewer overflow. Old sewers in many cities carry a combination of sewage and stormwater, so a CSO is a relief point that prevents flooding in homes and treatment plants by discharging the combined flow (mostly stormwater) to the environment during heavy rains. This is a clip from our video, "So if you ever wondered..." available at http://neorsd.org/videos