[Werner]

I tried to draw the ground and water surfaces from a correct HEC RAS Analysis.

I imported the crossections as x,y,z ASCII-files.

the ground geometry are contour lines (ACAD 2d-Polylines with the correct elevation), imported as dxf12-file by the "insert part - external" method.

When I specify in the "configure - elevation layer" menu this layer to use, and then run "floodplain map results" from HEC RAS -menu, a message is displayed:

"Unable to generate topo map ground surface:
No data found on elevation layers.
BOSS RiverCAD error report:
Unable to read surface data file. "

The AutoCAD-objects are correct.

If anybody could help me would be great.

Does anybody know if the "insert part"-method is the only way to get dxf-Files in Rivercad ???

Thank you

Werner