What is the recommended normal flow speed to reduce material buildup in sewer systems?

The recommended normal flow speed to reduce material buildup in sewer systems is 2 feet per second (fps). This velocity is considered effective in maintaining adequate flow and minimizing the risk of sedimentation within pipes. At this speed, the flow is strong enough to keep solids suspended and prevent them from settling at the bottom of the sewer line, thus reducing the likelihood of blockages and the accumulation of debris.

Maintaining a velocity of 2 fps ensures that the gravity-driven flow is sufficient to transport materials without causing turbulence that could lead to erosion or damage to the system. Lower speeds may not effectively transport solids, leading to increased maintenance and potential operational issues. Therefore, 2 fps strikes a balance, promoting efficient flow while minimizing the potential for build-up and ensuring the longevity of the sewer infrastructure.