What is static pressure?

Static pressure refers specifically to the pressure that is present in a system when water is not flowing. This means it reflects the potential energy stored in the water due to its elevation or elevation head, as well as the pressure exerted by the fluid at rest. When measuring static pressure at a discharge point, the system is in equilibrium, and there are no dynamic changes caused by movement or flow.

In contrast, the other choices relate to different aspects of pressure in a water system. For instance, the pressure of water when it is actively pumped describes dynamic pressure, which occurs when flow is taking place and is influenced by the velocity of the water. The idea of pressure due to the movement of water also refers to dynamic situations where kinetic energy is a factor. Lastly, the pressure measured during water filtration may involve various factors related to flow and filtration processes, but it does not specifically define static pressure. Thus, the definition provided in the correct answer encapsulates the concept of static pressure accurately.