Walking, talking, head.

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Water head pressure is

the force exerted by the weight of water, proportional to its vertical height (or "head") above a given point. It represents the potential energy of water, where roughly

feet of elevation equals 1 PSI (pounds per square inch) of pressure. It is crucial for pump system design, determining how much pressure is needed to overcome elevation differences and pipe friction.

This video explains the concept of water head pressure and how it's related to the depth of water