2024-07-26 00:00:00 Iowa Fire Flow is offered as a free app with no ads and no in-app purchases. Usage of this app and results are for academic purposes only. Do not rely on the results for actual fire incidents. Iowa Fire Flow is based on the Iowa State University Rate of Flow Formula developed by Keith Royer and Bill Nelson at the Fire Service Institute of Iowa State University at Ames, Iowa, USA referenced in "Water for Firefighting--Rate of Flow Formula", Iowa State University Bulletin #18, 1959.