HEC-HMS is a software tool developed by the U.S. Army Corps of Engineers that simulates the rainfall-runoff processes of watersheds to help manage water resources and predict flooding. This learning path teaches new users how to get started in HEC-HMS, including how to access the software and start their first project.  It covers a common workflow for modeling floodplains and exporting results to HEC-RAS for detailed analysis. This new addition includes: