How does the height of a gravity tank affect water pressure?

The relationship between the height of a gravity tank and water pressure is governed by hydrostatic pressure principles. Specifically, pressure in a fluid increases with depth due to the weight of the fluid above it. This increase is quantified at a rate of approximately 0.433 PSI for every foot of water height.

As the height of the gravity tank increases, the column of water exerts more weight downward, resulting in higher pressure at the outlet of the tank. Therefore, a tank that is positioned higher will indeed produce more pressure in the water system below it.

This fundamental concept is crucial for understanding how gravity tanks function in various applications, such as in irrigation and fire protection systems. Higher tanks can ensure adequate water pressure is maintained throughout a system, contributing to efficient water delivery.

In contrast to this, the other options suggest incorrect relationships between height and pressure that do not align with the principles of fluid mechanics. Pressure does not remain constant or decrease as height increases; rather, it is directly proportional to the height of the water column.