Roughness Variable for RAS, allows an easy way to update manning values of all cross sections of a HEC RAS project. Moreover, it allows to assign one different values to each cross section

1. 2011
Roughness Variable for RAS
Tutorial
Technical Solutions for
Sustainability
TSS

2. Roughness Variable for RAS Tutorial
Contents
1. Installing RVR ........................................................................................................................................ 3
2. Using RVR .............................................................................................................................................. 3
3. Roughness file ....................................................................................................................................... 5
4. Courses.................................................................................................................................................. 5
5. Other services ....................................................................................................................................... 6
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3. Roughness Variable for RAS Tutorial
1. Installing RVR
Before starting RVR, be sure that you have installed HEC-RAS version 4.0. Then, unzip the zipped folder,
double click the install icon and press install, and wait some seconds until the installation is finished.
To start RVR, go to the HEC-RAS help option and select the option RVR (Figure 1).
Figure 1
2. Using RVR
When executing RVR you will have the welcome window, and after some 5 seconds the main window.
The first step consists in loading a HEC-RAS geometry file where you are going to work. This is done by
pressing the button "Load Geometric File"(figure 2). This button will display a dialog showing the folder
and all files with the extension .gXX (Figure 3).
Figure 2 Figure 3
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4. Roughness Variable for RAS Tutorial
Once the geometric file is loaded, the next step is to load the file with the new roughness values for the
cross sections. This task is accomplished by pressing the button "Load Roughness File"(figure 4). This
button will display a dialog showing the folder and all files with the extension .txt, which is the extension
of the file with the roughness values (Figure 5).
Figure 4 Figure 5
The last step is just to press the button labeled "Update Roughness Values". Once all the values were
updated, a message box will pop up with the message " Roughness values successfully updated..." as in
Figure 6.
Figure 6
NOTE: The names of all the cross sections of the given river and reach must be consecutive integers.
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5. Roughness Variable for RAS Tutorial
3. Roughness file
The file with the roughness values is a ".txt" file very easy to understand and to prepare. Moreover, this
special format allows assigning one different value for each cross section.
This file consists of one single column where each row is the roughness values for each cross section.
The first value is the value for the upstream cross section, and the next rows are the values for for the
next cross section going downstreams.
The values must begin with a dot (.). For instance, if the value is 0.013, then the value in the file would
be ".013".
If you need a special personalized application for HEC - RAS just contact us and we will be glad to help
you improve your use of HEC-RAS in order to maximize your benefits. tss.vraag@gmail.com
4. Courses
We also offer technical support and special courses such as:
HEC-RAS and steady flow
• Open channel flow
• HEC-RAS GUI
• Data input
• Create Plans
• Output analysis
Advanced steady flow
• Supercritical and mixed flow
• Bridges and culverts
• Drop structures
• Tributaries and junctions
HEC-RAS and GIS (GEORAS)
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6. Roughness Variable for RAS Tutorial
HEC-RAS unsteady flow
• Unsteady flow
• Finite difference approximation
• Courant Number
• Numerical stability and dumping
• Data requirements
• Unsteady flow analysis
• Output analysis
Sediment transport in HEC-RAS
• Sediment characteristics
• Sediment transport theory
For any comments, questions or suggestions, just contact us: tss.vraag@gmail.com
5. Other services
Besides developing special software applications according to your needs, we also offer assistance and
Webinars about different software and applications such as:
• Development of personalized application.
• HEC-HMS
• MOUSE - Mike Urban
• Mike 11
• EPANET
• SOBEK 1D2D
• Delft 3D
• GPSX
• MODFLOW
• ARCGIS
• Online GIS application
• AutoCAD
• Eagle Point & Land Desktop
• Cloud and cluster computing
• New technologies for home and office
tss.vraag@gmail.com
www.hometss.com
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