What does the hand method determine regarding pump discharge pressure?

The hand method is a practical technique used by fire apparatus operators to establish the appropriate pump discharge pressure necessary for supplying a hose assembly effectively. This method typically involves using hand pressure gauges to assess and adjust the pump discharge to ensure that the hose can operate at an optimal level.

This approach ensures that the fire hose receives the necessary pressure to deliver water efficiently to the firefighting devices at the end of the hose, allowing for successful fire suppression efforts. Maintaining proper pressure is essential as it affects the reach and effectiveness of the water stream, enabling firefighters to combat fires more effectively.

In contrast, the other options refer to different aspects of pump operations and pressures that do not directly relate to what the hand method specifically assesses. For instance, pressures needed to fill tanks, maintain pump efficiency, or conduct safe operations may involve variable calculations or equipment checks beyond the scope of the hand method.