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The documentation for HEC-RAS consists of a User's Manual which describes how to use the interface; a Hydraulic Reference Manual which describes the data required, equations used, solution techniques, and modeling advice; and an Applications Guide which contains 17 example applications of using various aspects of HEC-RAS. All three documents are in PDF format and can be viewed online or downloaded. To view online or download individual chapters, go to the manual's individual page with the links below.

The HEC-RAS documentation is automatically installed during the setup of the program and can be accessed through the Help menu. To view the documentation without installing the program, you may use the links below.

• HEC-RAS 4.0 User's Manual [Primary Download Site] [Alternate Download Site]
• HEC-RAS 4.0 Applications Guide
• HEC-RAS 4.0 Hydraulic Reference Manual

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.

In addition to the above Manuals and Guides the following River Hydraulics Research Documents may also be of interest:

• RD-41 A Comparison of the One-Dimensional Bridge Hydraulic Routines from HEC-RAS, HEC-2, and WSPRO, Sep 95
• RD-42 Flow Transitions in Bridge Backwater Analysis, Sep 95

 Adobe Reader 7.0 or later is required to view these documents.