Use this dialog box to specify the surface, alignment, and section data to export to HEC-RAS format for use in flood analysis.
See To Prepare Data to Export to HEC-RAS Format for information about the data you select in this dialog box.
Workflow: To Export and Import HEC-RAS Data
Select Surface And Alignment
- Surface
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Specifies the surface that you want to sample for the stream sections.
- Site
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Specifies the site that contains the stream centerline alignment. Select <None> if the alignment is not located in a site.
- Reach Alignment
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Specifies the stream centerline alignment to be exported.
Select Sections To Export
- Sample Line Groups
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Specifies the sample line group that was created along the stream centerline alignment.
- River Name
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Specifies the name that is used in the HEC-RAS application as the title of the GEO file and is used as a label for the stream in the HEC-RAS Geometric Data window. This name should typically be the name of the stream alignment.
River Banks
- Check This To Use River Banks
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Exports either polylines or alignments as river bank information. Select the check box and then click Left and/or Right, and select the polylines or alignments in the drawing.
Note: The bank locations appear in the HEC-RAS application as red dots on the sections. The left and right bank locations tell the HEC-RAS application where the Manning’s n values change for left, channel, and right bank situations in the section. This effects the calculations and the level of water in the section. The Bank Positions exported to the GEO file are measured as percentages of the overall section length rather than as offset distances.
- Export
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Exports the data to a GEO file that you can import into the HEC-RAS application. For more information, see To Import Data into and Export Data from HEC-RAS Software.