Welcome to the Hydrologic Engineering Center's (CEIWR-HEC) River Analysis System (HEC-RAS) website. This
software allows the user to perform one-dimensional steady flow, one and two-dimensional unsteady flow
calculations, sediment transport/mobile bed computations, and water temperature/water quality modeling.
The purpose of this website is to enhance the support services provided to HEC-RAS customers. The HEC-RAS
website provides a number of resources, which include helping the user download software, learn how to use
HEC-RAS, resolve problems, report bugs, and suggest improvements to CEIWR-HEC products and service.
Unfortunately, CEIWR-HEC is unable to provide phone or email technical support to non-USACE customers.
However, CEIWR-HEC does encourage anyone who finds an issue with CEIWR-HEC software, to please report
that issue through the HEC-RAS Bug Report page. Also, please review CEIWR-HEC's Support Policy page for