Water Flow Calculators is a free Android application developed by Waterous App that offers a set of useful tools for firefighters. The app includes four different calculators: Friction Loss, Smooth Nozzle, NFA, and Iowa Formulas.

The Friction Loss calculator allows firefighters to quickly calculate the amount of water pressure lost due to friction in a hose. The Smooth Nozzle calculator helps to determine the water flow rate of a smooth bore nozzle. The NFA calculator calculates the required number of firefighters for a particular fire scenario, while the Iowa Formulas calculator allows users to calculate the amount of water needed to extinguish a fire.

Overall, Water Flow Calculators is a valuable tool for firefighters, providing them with quick and easy access to important calculations that can help them in their daily work. The app is user-friendly and straightforward, making it easy to use even for those who are not familiar with the calculations involved.