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 further details.