CSO is a stormwater industry term for "Combined Sewer Overflow." They happen in older cities where storm runoff and raw sewage (poop) go into the same sewer system. When there is a lot of rain, the wastewater treatment plants overflow, and then raw sewage runs into waterways.
CSO is a stormwater industry term for "Combined Sewer Overflow." They happen in older cities where storm runoff and raw sewage (poop) go into the same sewer system. When there is a lot of rain, the wastewater treatment plants overflow, and then raw sewage runs into waterways.
https://en.wikipedia.org/wiki/Combined_sewer#Combined_sewer_...