The Collection Section is divided into two main operating sections: the Line Maintenance and Pump Station sections. Line maintenance deals with the collection and conveyance systems which encompass approximately 40,000 square miles of sewer use area with 300 miles of gravity sewer and 50 miles of force mains. This system is used to deliver the raw sewage to the Wastewater Treatment Plants. Pump Stations are used to assist in the conveyance of wastewater to the treatment plants. The gravity sewer lines move the wastewater by use of gravity to flow to low areas. Once in the these low areas, a pump station is used to move the wastewater along until it can again flow by gravity. The lines that come out of a pump station are called force mains because the wastewater in these lines are under pressure.
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