What is the minimum velocity required to flush a distribution system?

The minimum velocity required to effectively flush a distribution system is 2.5 feet per second (fps). This velocity is critical because it ensures the removal of sediment, biofilms, and other potential contaminants that can accumulate in the water pipes over time. When the water in the system flows at this speed, it generates enough force to dislodge particulates and push them out of the system, promoting better water quality and reducing the risk of issues such as taste, odor, and bacterial growth.

A velocity of 2.5 fps is generally recognized in industry standards as the lower threshold for flushing operations. Flushing below this velocity might not be sufficient to achieve desired cleaning results, thereby potentially allowing contaminants to remain in the system. Maintaining proper flow rates is essential not only for the physical cleanliness of the pipes but also for ensuring compliance with water quality regulations and the health and safety of consumers.