Using the 10-15-25 rule, if the static pressure is 65 psi and residual pressure is 57 psi while flowing 400 gallons, what is the available water?

To determine the available water using the 10-15-25 rule, you first need to understand the relationship between the static pressure and the residual pressure when water is being flowed.

In this scenario, the static pressure is 65 psi, and the residual pressure under flow conditions is 57 psi while flowing 400 gallons per minute. The difference between the static and residual pressures helps determine the amount of available water.

The rule states:

• If the residual pressure is above 20 psi, you subtract the residual pressure from the static pressure and multiply the result by a conversion factor based on the gallons flowing. In this case, you're flowing 400 gallons.

So, first calculate the difference: Static Pressure - Residual Pressure = 65 psi - 57 psi = 8 psi.

Now, according to the 10-15-25 rule, for every 1 psi you have, you can generally provide 100 gallons of available water. Therefore, you multiply the pressure difference (8 psi) by the conversion factor (100 gallons/psi): 8 psi × 100 gallons/psi = 800 gallons.

Thus, the available water in this scenario is indeed 800 gallons. This reasoning aligns with the understanding of how pressure measurements correlate to