What is the elevation pressure (EP) formula for raising water?

The correct choice for the elevation pressure (EP) formula for raising water is based on the understanding of how pressure is affected by elevation in firefighting operations. For every story that you need to pump water up, an additional pressure is required to overcome the gravitational pull.

In the context of firefighting, water must be pumped to overcome the weight of the water column above, and this is quantified with a specific psi requirement. The standard measurement in the fire service is that you need to add 5 psi for each story of elevation above the first floor, starting at about 10 feet for each story. This means that as you go up each story, you effectively increase the pressure needed to ensure that water reaches the intended height and can combat fires effectively.

This understanding is fundamental in ensuring that adequate pressure is maintained when supplying water through hoses to upper stories, and thus the formula aids firefighters in calculating the necessary pressure adjustments for vertical lifts.