What type of pressure is gained when the nozzle is below the pump?

When the nozzle is located below the pump, the system benefits from elevation gain. This occurs because, according to the principles of fluid dynamics, height differences can influence the pressure experienced at a given point in the fluid system. The pressure at the nozzle increases due to the gravitational potential energy associated with the greater height of the water column above at the pump.

In fire service operations, understanding this principle is essential for determining the capabilities of the water supply and how it can affect firefighting efforts. Elevation gain plays a critical role in calculating total available pressure when determining whether a pump has enough pressure to effectively deliver water at the desired flow rates and pressures at the nozzle during firefighting operations.

In this context, dynamic pressure relates to the movement of fluid resulting from velocity, while residual pressure refers to any leftover pressure in the system after accounting for friction losses. Pressure drop would indicate a decrease in pressure due to various factors such as friction losses or elevation increases in the opposite direction. The elevation gain is the most accurate description of the pressure scenario described in the question.