The updated HEC-RAS model was a coordinated effort involving the Corps of Engineers, Federal Emergency Management Agency, National Weather Service, U.S. Geological Survey; the states of Illinois, Iowa, Minnesota, Missouri, and Wisconsin; and interested private individuals as members of the public involvement group. In addition, technical advisory groups consisting of nationally renowned experts were formed to help address the complex issues of hydrology and hydraulics. The model update process also included comprehensive quality assurance, quality control, and independent technical reviews though several iterations and levels of review.