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CAD tip CAD tip # 8932:

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HEC-RAS Import/Export in higher versions of AutoCAD Civil 3D.

A - answer The former add-on module "HEC-RAS Import Export Extension" for older Civil3D versions is no longer needed as it is already included in the standard functionality of AutoCAD Civil 3D 2013 (and higher). The link to the freely available application "HEC RAS" (River Analysis System by the US army and the Engineers' Hydrologic Engineering Center) for water flow analyis is now included in the standard Civil3D ribbon.

The command IMPORTHECRAS for importing .SDF files can be launched from the ribon Insert > Import > Import from HEC RAS:

The command EXPORTHECRAS for exporting .GEO files can be launched from the ribbon Output > Export > Export to HEC RAS:

100% *  CAD 
22.11.2012    13259×  
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applies to: Civil 3D 2013 ·

See also:
Tip 9302:How to change elevation units in a map or GIS source?
Tip 7852:Put Google Earth maps directly into AutoCAD.
Tip 6609:Reverse sample line numbering for river flow alignments.
Tip 6312:Making transfer of AutoCAD DWG files faster over WAN.

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