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The documentation for HEC-RAS consists of a User's Manual which describes how to use the interface; a two- dimensional User's Manual which describes how to use the two-dimensional and combined one- and two- dimensional modeling capabilities; a Hydraulic Reference Manual which describes the data required, equations used, solution techniques, and modeling advice; a BSTEM Technical Reference and User's Manual which describes the BSTEM component in HEC-RAS and how to use BSTEM in HEC-RAS; and an Applications Guide which contains twenty-four example applications of using various aspects of HEC-RAS. All five documents are in PDF format and can be viewed online or downloaded. To view online, go to the manual's individual webpage with the links below.

The HEC-RAS documentation is automatically installed (with the exception of the BSTEM manual) during the setup of the program and can be accessed through the Help menu. To view the documentation without installing the program, the user may use the links below. See the What's New page for the current release notes listing the bug fixes for this and previous releases. The What's New page also summarizes the current version's features.

Benchmarking of the HEC-RAS Two-Dimensional Hydraulic Modeling Capabilities

RD-51 summarizes how the HEC-RAS software performed in the two-dimensional modeling
benchmark tests developed by the United Kingdom's (UK) Joint Defra (Department for Environmental Food and
Rural Affairs) Environment Agency.

In addition to the above manuals and guides the following documents may also be of interest: Certificate of Networthiness (CoN) Documentation certifying that the software may be installed on Department of Defense (DOD) computer systems, subject to the limitations stated in the certificate. Old installations should be upgraded. Adobe Reader XI or later is required to view these documents.