Before revision: Sanitary sewer overflow Sanitary sewer overflow is a condition in which untreated sewage is discharged from a sanitary sewer into the environment prior to reaching sewage treatment facilities.
After revision: A manhole cover unable to contain a sanitary sewer overflowSanitary sewer overflow Sanitary sewer overflow is a condition in which untreated sewage is discharged from a sanitary sewer into the environment prior to reaching sewage treatment facilities.