Before revision: Water source for flushing manholes can come from potable water, tidal water, or water from clarifiers of sewage treatment plants Maintenance and issues Sanitary sewer overflow &I) occurs when water other than wastewater enters sewer system.
After revision: Water source for flushing manholes can come from potable water, tidal water, or water from clarifiers of sewage treatment plants Maintenance and issues Infiltration and inflowSanitary manhole inflow due to a floodInfiltration and inflow (I &I) occurs when water other than wastewater enters sewer system.