What pressure is shown on the intake gauge of a pumper connected to a hydrant but not discharging water?

The pressure indicated on the intake gauge of a pumper connected to a hydrant but not discharging water is referred to as static pressure. This measurement occurs in a scenario where there is no flow, meaning that the water within the pipe remains still.

Static pressure represents the pressure in the system at rest, which is the potential pressure available just before water begins to flow. This is important because it provides a baseline pressure that helps firefighters and engineers understand what pressure is available for firefighting operations.

In the case where water is being discharged, the conditions would change, and one might measure flow pressure or residual pressure, but in this specific scenario without any discharge, static pressure gives a clear indication of the system's capability to deliver water when needed. This concept is vital in firefighting operations as it helps assess whether there is enough pressure available to effectively combat a fire.