The forward pressure at a discharge opening in a water supply system is referred to as what?

The term that describes the forward pressure at a discharge opening in a water supply system is flow pressure. Flow pressure is measured when water is actively flowing through the system and represents the pressure available to deliver water to the discharge point. This pressure is crucial during firefighting operations as it determines how effectively water can be delivered through hoses and nozzles to combat a fire.

Static pressure, on the other hand, is the pressure measured in the system when there is no flow, while residual pressure refers to the leftover pressure available in the system after some water is being used or discharged. Dynamic pressure is the pressure of the water in motion and is closely related to flow conditions but does not specifically address the forward pressure available at the discharge point during active flow. Thus, flow pressure is the most accurate term for describing the pressure at the discharge opening when water is being delivered from the system.