Interceptor Sewer

Definition - What does Interceptor Sewer mean?

An interceptor sewer, also known as an interceptor, is a component of a sewer network that helps to control its flow. It receives the flow from trunk sewer lines and sometimes from storm water runoff and directs it to the wastewater treatment plant. It is among the larger lines of a sewer system.

Trenchlesspedia explains Interceptor Sewer

A sewer network takes advantages of gravity and sometimes pumping stations to move wastewater to ever larger pipes and system components. At some point the sewage flow encounters a part of the system known as the interceptor sewer. As the name indicates, it gains control of wastewater before it moves to the waste treatment plant.

The interceptor is actually a part of the utility infrastructure of a community. The rupture of an interceptor sewer in Macomb County, Michigan in December 2016 caused a 250-foot-long sinkhole that disrupted an entire neighborhood.

As larger pipes in the system, the tunnels for interceptor sewers are generally excavated by large tunnel boring machines. Construction of an interceptor sewer can be a very large project. Without trenchless construction, installing such a large pipe would require troublesome excavation that could cripple a city.

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