What is the formula for calculating the gpm flow rate for a tender?

The correct formula for calculating the gallons per minute (gpm) flow rate for a tender is derived from the need to account for the water available in the tank and how it correlates to the time taken for the trip. In this scenario, the flow rate is calculated by taking the tank size and reducing it by 10% to ensure accurate accounting for the volume that can realistically be used. This adjusted tank size is then divided by the trip time, resulting in the flow rate in gpm.

This approach considers potential losses or reductions in water volume during transport, which makes the calculation practical and reflective of real-world scenarios. By subtracting 10% from the tank size, it acknowledges factors like water sloshing or not being fully available at the destination, which could affect the effective flow rate once the tender arrives.

The other options do not correctly represent how to capture water availability and time in the calculation, thereby not aligning well with operational needs when using tenders in firefighting.