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.
The software features a completely integrated work environment including a database, data entry utilities, computation engine, and results reporting tools. A graphical user interface allows the user seamless movement between the different parts of the software. Simulation results are stored in HEC-DSS (Data Storage System) and can be used in conjunction with other software for studies of water availability, urban drainage, flow forecasting, future urbanization impact, reservoir spillway design, flood damage reduction, floodplain regulation, and systems operation.