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So, having the ability to store not only the water itself, but also the energy that has been imparted to it by the pumps is important.

In some cases a pump literally lifts the fluid to a higher elevation, but in most cases a pump imparts energy to a fluid by raising its pressure.

You can see what’s happening here in real time: the pump is robbing some of the kinetic energy from the flow and imparting it to a smaller volume of water.