how to import river geometry from land desktop?

[rahulk]

Hi,
I am trying to model a river in hec-ras. I have dtm surface in land desktop. I was able to import cross sections from cadd to hec-ras but I don't know how to import river base line (or alignment) and stationing from Autodesk Land desktop to Hec-Ras.

Can somebody help me with this?

thanks,

[Chris Maeder]

Don't mean to toot our own horn, but fairly seamless integration with RiverCAD, HEC-RAS and AutoCAD.

[bls94001]

We have been using HEC-geoRAS as a go between. It is good for putting in stream and XS locations and distances but is lacking a little in the bridge and structures department. Those are easier to put in manually.

Note that your cross sections will have extra points sampled from the tin and you may want to overwrite them in HEC-RAS. You will at least need to filter them. I export the station/elevation info from cad to text files and then replace the XS data with that.

In CAD, make sure all the layers are turned on that you will need but no extras.

Under one of the file menu's(probably cad map but unsure) goto export autocad and choose dxf 2000 format.

In ArcMap or ArcView, add the linework from this file. Create your georas layers and copy features from the dxf layer into them via the edit polyline tool and ctrl+c and ctrl+v.

If you can't bring in your tin directly to ArcMap, make a shapefile of all the 3d features and then create a tin from that in 3d analyst. Watch out for 0 elevations here and in your xs data.

Make sure that all XS are crossed by the stream and flowpaths only once and that the tin encompasses the entire region.


good luck.

[gutch]

Hey,

i d need a more detailled explanation of the message above. My problem: I have a contour-map in AutoCAD of a river. I want to export this into ArcMap with the aim to extract Cross-Sections using GeoRAS. The question comes down to, at least i think so, how to make a 3D file out of this 2D contour map. I guess this would work by making a shapefile and then using the 3D Analyst as mentioned in the message above. I have no idea how that works though. Could anybody explain plz??

Thanks a lot in advance, Frauke

[Chris Maeder]

Simple answer, RiverCAD. You can download a trial version from our website.