What is an indicator of proper pressure when using a water stream in firefighting?

The high forward velocity of the stream serves as a crucial indicator of proper pressure when using a water stream in firefighting. When the water stream is propelled forward at a high velocity, it indicates that the nozzle pressure is adequate, allowing the firefighter to effectively combat the fire. The forward velocity helps ensure that the water can reach the target area effectively, penetrate the fire environment, and maximize extinguishing capabilities.

A high forward velocity also contributes to improved distance and coverage of the water stream, allowing firefighters to place the water exactly where it is needed to control or extinguish the fire. This characteristic, thus, reflects an optimal balance of pressure and flow that assists in achieving the firefighting objective.