HEC RAS

Using the EE HEC-RAS Tools

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Overview The EE HEC-RAS Tools can export Civil 3D surface data to HEC-RAS for use in flood analysis.

1. Unzip the EE-HEC RAS tool and read install guide. Close Civil 3D and all other AutoCAD programs. Execute the Install Hec batch file.

2. Open Civil 3D and bring up the Toolbox tab of the Toolspace. Make sure there is an entry for Engineered Efficiency and HEC-RAS.

3. Open a drawing that contains an existing ground surface that represents a river.

4. Define the stream centerline as an alignment.

5. Draw polylines at desired stream section locations.

6. In the Toolbox, right click on the HEC-RAS Export entry under Engineered Efficiency. Choose Execute.

7. In the EE RAS Export dialog, select the surface, stream alignment site and stream alignment. Also choose your desired styles and label styles.

8. Press Pick Sections. Choose the section polylines in your drawing, then press enter.

9. In the Select Save Location for GEO file dialog, provide a name for the .GEO file. Press save.

10. The EE RAS Export dialog will reappear with new section information. Press Exit. Note that new alignments and profiles appear in Prospector.

11. Create Profile Views for each stream section under Profiles>Create Profile View.

12. In HEC-RAS, press Edit/Enter Geometric Data.

13. In the Geometric Data interface, choose File>Import Geometry Data>GIS Format. Navigate to the .GEO file that you created.

14. The geometric data will appear in the interface. Proceed with HEC-RAS analysis as required.

Procedure: Using the EE HEC-RAS Tools to Export Stream Section Data

During this procedure you will use the EE HEC-RAS Export Tool to extract Civil 3D surface information and stream sections.

Using the EE HEC-RAS Tools to Export Stream Section Data

Step Action Result





1. Once you have unzipped the EE HEC RAS tool download and read the Install Guide, navigate to C:\Program Files\Engineered Efficiency\RAS2.0

You will see the following files:

2. Close Civil 3D and all AutoCAD programs. Double click on the Install Hec batch file.

An install window will quickly appear and disappear. The application has been installed.

3. Open Civil 3D and bring up the Toolspace. Switch to the Toolbox tab of the Toolspace. If you do not have a Toolbox tab, select General>Toolbox and it will appear.

There will be an Engineered Efficiency entry on the Toolbox.

If you do not see an Engineered Efficiency entry, you may have had an AutoCAD program open when installing the application. Reread the RAS Install Guide and try again.





4. Open a drawing containing a river you would like to study. Be sure there is an existing ground surface.

5. Define the stream centerline as an alignment. Take care to be sure the stationing goes in your desired direction.

6. Draw polylines at the desired stream section locations. Take care to draw them in the desired direction.





7. Expand the Engineered Efficiency entry on the Toolbox. Right Click on HEC-RAS Export and choose Execute.

The EE RAS Export dialog will appear.

8. Use the Surface pull down to choose the surface you would like to sample for the stream sections.





9. Use the Site pull down to choose the site that contains your stream centerline alignment.

10. Use the Reach Alignment pull down to choose the alignment that represents your stream centerline.

11. Use the pull downs for styles and labels to establish the styles and labeling for the new alignments, and styles for the new profiles.





12. Press the Pick Sections button.

You will be prompted to select the polylines that represent your stream section locations.

13. Select all of your stream section location polylines. Right click or press enter to exit the command.

The Select Save Location for GEO file will appear.





14. Navigate to the desired save location for the .GEO file. Name the .GEO file. Press Save.

A status bar will appear while the application writes the cross section data.

Then the EE RAS Export dialog will reappear.





15. Press Exit in the EE RAS Export dialog. Move over to the Prospector tab of the Toolspace. Expand the alignment branch under your site.

Note that new alignments have been created for each stream section.

You can also see the alignment objects in the drawing.

16. Expand the Profiles entry under one of the new alignments.

Note that a profile has been created sampling the existing ground information.





17. A profile view must be created to show this profile information. Choose Profiles>Create Profile View

The Create Profile View dialog will appear.

18. Choose one of the new alignments and work your way through the wizard. Place your profile view in the drawing.

A profile view representing the stream section will appear.

19. Open HEC-RAS, create a HEC-RAS project. A HEC-RAS project will be created and ready to accept the section surface data.

20. Press the Edit/Enter geometric data button.

The Geometric Data dialog will appear.





21. Choose File>Import Geometry Data>GIS Format.

The Import GIS Format data file dialog will appear.

22. Navigate to the .GEO file that you created in Step 14.

23. Press OK. The Import Geometry Data wizard will appear.





24. Work your way through the Import Geometry Data, then press Finished-Import Data.

The data will be visible in the Geometric Data window.

25. Press the Cross Section button.

The Cross Section Data dialog will appear with your surface information.

Note that the Site Name is used for the River field, and the centerline Alignment name is used for the Reach field.

26. Process your data in HEC-RAS as necessary.

27. STOP

End of procedure.



Overview The EE HEC-RAS Tools can export Civil 3D surface data to HEC-RAS for use in flood analysis.

1. Complete your analysis in HEC- RAS.

2. Return to the main HEC-RAS window. Choose File> Export GIS Data.

3. In the GIS Export dialog, check “Export Water Surfaces” and choose any profiles you might have created during the analysis. Press Export data. An SDF file is created.

4. Open the original drawing in Civil 3D. Locate the Toolspace and switch to the Toolbox tab.

5. Expand the Engineered Efficiency entry on the Toolbox. Right Click on HEC-RAS Import and choose Execute.

6. In the EE RAS Import dialog, choose the correct Site, style and label for the alignment, and a style for the profile.

7. Press Browse for HEC-RAS File, then select the SDF file you created.

8. Press Import This File. Profiles will be imported under your stream centerline alignment.

9. To show flood elevations on the stream section profiles, create a simple corridor. First create an assembly using the LinkSlopeToSurface subassembly.

10. Build a simple corridor using the stream centerline alignment, the appropriate flood elevation profile and the LinkSlopeToSurface assembly. Be sure to set the target surface to be your existing ground.

11. Once the corridor is built, make a corridor surface.

12. Sample the corridor surface onto profile view by using the tools under Profile>Create Profile from Surface.

Procedure: Using the EE HEC-RAS Tools to Import Stream Section Data

During this procedure you will use the EE HEC-RAS Import Tool to bring HEC-RAS analysis results into Civil 3D.

Using the EE HEC-RAS Tools to Import Stream Section Data

Step Action Result

1. Complete your analysis in HEC- RAS.





2. Return to the main HEC-RAS window.

3. Choose File> Export GIS Data The GIS Export dialog will appear.

4. In the GIS Export dialog, check “Export Water Surfaces” and choose any profiles you might have created during the analysis.

5. Press Export Data. A dialog box will appear that confirms that the SDF file was created.

6. Open the original drawing in Civil 3D.





7. Locate the Toolspace and switch to the Toolbox tab. If you do not have a Toolbox tab, select General>Toolbox and it will appear.

There will be an Engineered Efficiency entry on the Toolbox.





8. Expand the Engineered Efficiency entry on the Toolbox. Right Click on HEC-RAS Import and choose Execute.

The EE RAS Import dialog will appear.





9. Choose the site that contains the centerline alignment. Choose styles for the alignment and profiles, and a label set for the alignment.

10. Press Browse for HEC-RAS File to select your SDF export file.

The Select HEC-RAS Export dialog will appear.

11. Select your SDF file, then press Import This File.

The application will import the alignment (if it does not already exist in the drawing), section locations and flood elevation profiles.





12. In order to show the flood elevations on the stream section profiles, you must make a corridor and corridor surface using the stream alignment and the flood elevation profiles. Build a simple assembly using the LinkSlopeToSurface subassembly.

13. Build a Simple Corridor using the Stream Centerline Alignment, the appropriate flood elevation profile and the Water Surface Assembly.

Be sure to set your Existing Ground surface as the target surface.

A corridor is built that represents the water surface during the flood event.





14. Build a surface for the surface top links.

Your surface will appear. The surface style is not important. This surface will strictly be used to create a sampled line on the stream sections.

15. Locate a steam section profile on which you would like to place the flood elevation.

16. Choose Profiles>Create Profile from Surface.

The Create Profile from Surface dialog appears.

17. Select the appropriate section alignment and flood surface. Press Add.

The sampled flood surface appears in the Profile list.

18. Press OK. The new sampled line representing the flood elevation is drawn

17. STOP

End of procedure.



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HEC RAS