Which customary formula would be used to determine elevation pressure in a multistory building?

To determine elevation pressure in a multistory building, the customary formula is based on recognizing that water pressure decreases with height due to the weight of water and the influence of gravity. Generally, for water systems, it is accepted that there is approximately a 5 psi (pounds per square inch) increase in pressure for every 10 feet of elevation.

In the context of multistory buildings, it is commonly understood that each story typically represents about 10 feet. For each story above the ground level, this leads to a corresponding increase in pressure. Therefore, the formula used to find the elevation pressure in terms of stories is 5 psi multiplied by the number of stories minus one (accounting that the first story typically does not require an elevation adjustment).

This understanding aligns with standard practices in hydraulic calculations and ensures proper water supply pressure for firefighting or plumbing needs throughout the building. Hence, using 5 psi per story minus one accurately represents the pressure increase due to elevation in a practical and effective manner.