Sewer Main

Description

A **sewer main** is a principal pipe in the sewer system, which transports wastewater, and in some cases also rainwater, from connecting branches to a wastewater treatment plant (WWTP). The sewage system is an essential part of a cities sanitary infrastructure, and under every developed city there are kilometers of sewage pipelines. In Berlin for example, there are approximately 9,600 km of sewer pipes. These are divided into wastewater sewers, storm water sewers and combined sewers.