Sewer force mains are used where gravity is not enough to move sewage or storm water runoff through a sewer line. Force mains are fitted with pumps at lifting stations that help convey the wastewater from a lower elevation to a higher elevation. Force mains act as a support system for wastewater sewer lines that are installed in low lying areas with treatment plants situated at an elevation requiring pumping to convey sewage forward.
In some places, the terrain does not support construction of gravity sewers all the way to the treatment plant. In such cases, force mains are constructed to help lift the wastewater to a higher elevation from where it continues on in the force main or is discharged into another gravity sewer depending on the terrain. The force main is also equipped with a cleaning system, valves and a flow control device.
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