For a sewer main to operate properly, its flow should be how many feet per second?

A sewer main is designed to efficiently transport wastewater without causing blockages or backups. The ideal flow rate is crucial for maintaining the system's functionality. A flow rate of 2 feet per second is considered optimal because it is sufficient to keep solids in suspension, preventing sedimentation and ensuring that the wastewater is effectively conveyed downstream.

At this speed, the sewer system can handle variations in flow, such as influxes during rain events or peak usage times, while also minimizing the risk of clogs. Flows that are too slow may allow solids to settle, leading to blockages, whereas flows that are excessively fast can cause erosion of the sewer pipe and increase the risk of damage.

In contrast, flow rates much lower than this can hinder the performance of the sewer system, while excessively high rates could create turbulence and other issues. Thus, maintaining a flow of 2 feet per second strikes a balance that helps to ensure the overall health and efficiency of municipal sewer systems.