Sanitary Sewer System The sanitary sewer collection system consists of approximately 41 miles of clay pipe varying in size from 6 inches to 24 inches in diameter, placed between 1906 and 1960, and 41 miles of 8-inch to 18-inch polyvinyl chloride (PVC) plastic pipe placed since 1959. There are approximately 1,500 manholes which vary in depth to about 20 feet.
McPherson’s flat ground caused much of the system to be laid at minimum slopes, thereby limiting capacity of lines without the aid of force mains or lift stations. There are 6 force mains and 6 lift stations currently in use.
The collection system lines are cleaned at least once every two years with a water jetting hose using a pressure of about 3,000 psi. Some lines are cleaned more frequently and are continually being assessed for repairs or replacement.