To Import Data from HEC-RAS

Use the Import HEC RAS command to display HEC-RAS analysis results in Autodesk Civil 3D.

1. In Autodesk Civil 3D, open the drawing from which you exported the GEO file.
2. Click Insert tabImport panel Import HEC RAS Find.
3. In the Import HEC RAS dialog box, select the Site For Reach Alignment. If no sites exist in the drawing, then a new site named RASimport is selected and will be created.
   Note: The stream alignment is imported into the drawing only if an alignment of the same name does not already exist in the site you specify. Existing alignments of the same name and site are not overwritten. LINE objects that represent the sections are only imported if the alignment is imported.
4. Select the Style For Reach Alignment.
5. Select the Alignment Label Style Set.
6. Select the Profile Style.
7. Select the Profile Label Style Set.
8. Under SDF To Import, click the browse button and select the SDF file you exported from the HEC-RAS application.
9. Click Open.
10. In the Import HEC RAS dialog box, select the stream to import. When you select a stream, the number of profiles and sections that exist for that stream are shown in the dialog box.
    • The profiles are imported as Autodesk Civil 3D profile objects. You must create a profile view in the drawing to view them.
      Note: Existing profiles of the same name inside the same alignment will be overwritten. This is designed to allow multiple iterations within the HEC-RAS application without having to manually delete profiles in Autodesk Civil 3D when you bring in updated data.
    • The section data is imported as LINE objects along the alignment. These lines show where the top water surface intersects each section (according to the HEC-RAS application). They are created on layers using the convention <alignment name> - <profile name>. The section lines are imported only if the alignment is imported.
11. Click Import.

    The flood elevation profiles are imported into the drawing and are visible in Prospector.

    If an alignment of the same name and site as the selected stream alignment does not already exist in the drawing, then it and the section lines are also imported. Section lines are not imported if the alignment is not imported.

12. Click OK.