I have got hold of the survey in 3d DWG to import into my file.
I did this and selected create surface from import/Select import instance and then only selected the contour layers.
All seemed to work ok.
However the survey levels are in meters and by file is in millimeters. So what should be noticable fall across the site is showing as basically flat.
Also the srvey is at the wrong height in revit, which I'm assuming once I have fixed the topography issue I will need to reset my floor heights to mathc the survey levels.
