The pressure left in a water supply system when water is flowing is known as what?

The pressure left in a water supply system when water is flowing is referred to as residual pressure. This term is crucial in understanding the operational capabilities of a water supply system, particularly in firefighting scenarios.

Residual pressure indicates the pressure available to be utilized for effective firefighting when water is actively being drawn from the system. It is the portion of the total pressure that remains in the system while water is in motion, typically measured at a specific point in the system. This is important for fire fighters to determine if there is enough pressure for effective water flow to extinguish a fire.

Static pressure, in contrast, refers to the pressure in the system when no water is flowing, representing the potential energy stored in the system. Dynamic pressure often refers to the pressure in the system when water is flowing, but it does not specifically denote the pressure that is actually available for firefighting applications while water is in motion. Accuracy in these definitions is critical to successful firefighting operations, as understanding how much pressure remains in the system directly affects attack strategies and resource allocation.