What is Combined Sewer Overflow (CSO)?
Some communities collect both rainwater runoff and sanitary wastewater in the same sewer. these are called "Combined Sewers". Sometimes when it rains, sewers do not have enough capacity to carry all the rainwater and wastewater and the treatment plant is not large enough to treat the total combined flow. In these situations, the combined wastewater overflows into the nearest body of water - streams or rivers, creating a combined sewer overflow.
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