Flow Test Calculator is a free iPhone application developed by Larry Owens. This app serves as a useful tool for users who need to determine flow rates of hydrants and assess the maximum flow of a water system.

The app utilizes a standard variation of the Hazen-Williams formula to calculate the maximum flow available. With this calculation, users can easily determine the flow rates of hydrants and ensure that the water system is operating within its maximum capacity.

Flow Test Calculator is designed with simplicity in mind, making it accessible to users of all backgrounds. The app's units are in Imperial, allowing users to work with familiar measurements. Additionally, the developer has mentioned that a metric unit option will be available in the near future, further enhancing the app's usability.

Whether you're a professional in the water industry or simply need to assess flow rates for personal use, Flow Test Calculator provides a straightforward and convenient solution. Its intuitive interface and accurate calculations make it a valuable tool for anyone working with flow rates and water systems.