What is a true statement regarding flow pressure?

Flow pressure refers specifically to the pressure in a water system when water is actively flowing through the pipes, which is crucial for understanding how effectively water can be delivered to various points within a system such as in fire hydrants or sprinkler systems. This value is important for evaluating the performance of fire suppression systems and ensuring that water can be delivered at the necessary pressure during emergencies.

In contrast, other statements address different types of pressure. Atmospheric pressure is indeed related to the pressure exerted by the weight of the air above us, but it doesn't refer to the water flow dynamics. Static pressure denotes the pressure of non-moving water, and residual pressure refers to the pressure that remains when water is flowing, instead of when it's at rest. Understanding these distinctions is key to comprehending how water pressure functions in various scenarios.