What is the minimum flow rate recommended for flushing water mains?

The minimum flow rate recommended for flushing water mains is 2.5 feet per second. This flow rate is important because it helps to ensure that sediment and other materials are effectively removed from the interior of the water mains during the flushing process. Flushing at this velocity helps maintain water quality by preventing the buildup of sediment that can affect both the taste and safety of drinking water. Higher flow rates can enhance this process, but 2.5 feet per second is the established minimum to achieve adequate cleansing of the water mains while minimizing the risk of scouring the pipe walls.