A gravity tank is a large water storage tank located well
above the level of the buildings. For every 2.3 feet in elevation that the
water level in the storage tank is raised, 1 pound of pressure is added.
Therefore, to supply a minimum of 20 pounds of pressure, the tank would need
to be 46 feet (20 x 2.3) higher than the water outlets. Unlike other types
of storage, the pressure in gravity tanks is not derived by how much water is
in the tank, but by the elevation above the water outlets
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