If someone asks you to send them your model, these files must be sent, at a minimum. At the very least, you need these input files to run the model. This screenshot is a folder containing the input files generated by RAS after opening and saving one of the installed example projects. Numbers can go as high as “99” and are assigned in the order in which the files were created.
Although these examples all use the number “01” in the extension, RAS can have multiple instances of each of these files for a given project (except the. This post will feature a steady flow example project, and will list common HEC-RAS files that you’ll see for Unsteady flow, Sediment Analysis, Water Quality, and Hydraulic Design projects. Keeping track of these files in an organized manner is good practice, especially as your models grow in size and complexity. It is important to know what each of these files does and how they fit into the overall scheme of your project.
The program was written based on output from HEC-RAS version 2.2.Behind the scenes, HEC-RAS automatically creates a series of input and output files when working with a model. This customized table, once created and saved, will be accessible for use whenever HEC-RAS is run on the various projects and plans organized by the user. HEC-RAS has many optional output variables and allows the user to develop a customized table with certain desired information. For this reason, a program (named Rating_Table.exe) was written by NRCS to take a HEC-RAS output file and develop rating tables formatted for input to TR-20. However, HEC-RAS does not automatically develop there tables in the correct format for TR-20. The WSP2 program developed these tables as an option. One reason for computing water surface profiles is to develop cross section rating tables used in the NRCS TR-20 program for flood routing of stream reaches. *Note: WRAS is no longer supported by NRCS. WRAS is CCE compatible, but also runs on non-CCE machines. WRAS is written in Visual Basic 6.0, and requires Windows 95 or higher. Users are urged to become fully informed of all differences between the two models by reading the user manuals. Users should be aware that significant differences exist between HEC-RAS and WSP2 as to the way topography is represented by cross-sections. WRAS is a conversion program originally developed by NRCS to take existing WSP2 data sets and convert them in HEC-RAS format for import into HEC-RAS. PowerPoint developed for use with HEC-RAS 5.0 and newer:Īdvanced training materials: Streamflow Energy Streamflow Momentum Video shorts for various HEC-RAS operations (Web Link) Land use layers (NLCD 2016) for HEC-RAS 2D
NRCS employees and conservation partners may contact the NRCS HEC-RAS Team with questions or to obtain further information. Please review the most recent NRCS User Guide for additional information.
NRCS Empoyees: NRCS government computers require a CCE software package which may be obtained from IT support staff or the Software Center application.
The program is well documented with user's and technical reference manuals available on both the website and application "Help" menu.
Army Corps of Engineers Hydrologic Engineering Center website for full details and documentation on the HEC-RAS software. HEC-RAS Program Download and Documentation Users can also model bridge hydraulics inside of 2D Flow Areas and utilize HECRAS Mapper Editing Tools within RAS Mapper. Of particular note, version 6.0 can make use of spatially and temporally varied precipitation and infiltration in 2D Flow Areas, Storage Areas and between 1D cross sections. Version 6.0 corrects bugs from previous versions and includes several new features and upgrades. The major advantage of this program are Windows-based graphics for input and output, program technical and financial support at the Corps of Engineers Hydrologic Engineering Center, future enhancements expected, and its use by other government agencies and private engineers. Use of the NRCS program WSP2 has been phased out as NRCS engineers become trained and experienced with HEC-RAS. NRCS has adopted the Corps of Engineer's HEC-RAS (Hydrologic Engineering Center's River Analysis System) for computation of water surface profiles.