In 90% of these issues it has to do with the process when the file was either linked or imported. The following below is a process I have found to work every time. Before I do that list one process you should do or have done: open the dwg file and make sure the contours are actually 3D objects on the correct elevation plane. And there other is to record the layer names for the major and minor contours. I have had several instances where contours were are several different layer names. OK, here is the workflow:
Working in the Revit file
1 Find out what you expect the finish floor elevation value will be. Open an elevation view> set a new level at the distance SeaLevel would be below your finish floor level - name that new level view Sea Level; make it your current view
2 At the Insert tab select Link or Import, make sure "Current view only" is UNCHECKED - this is critical and one of the 90% problems
3 Import units: Auto-Detect, Positioning: Auto - Center to Center, select the Open
4 Now make your Site plan view current
5 Set the Orientation at the Properties Palette to True North
6 Rotate the DWG file to align with your projects Project North
7 Manage tab> Project Location panel>Coordinates>Acquire or Publish (select the one that meets your needs - in this instance Acquire is the one I use most ofter - I get the advantage to the Survey Point from the civils work
8 Select the dwg and at the Properties Palette you will see the site position is set to (Other section) Not Shared - select that button
9 At the Choose site>Record curent position...>select the Change button
10 At the Location Weather and Site dialogue box select the Duplicate button and provide a name for the location - select all OK buttons
11 At the Manage tab>Maanage Links>CAD Formats tab>select the name you used and at the bottom left select Save Positions
This will record the coordinates back to the civil / survey file. Now your are set to create a topo. And more important you have created a site plan that can show you True North and Project North - how cool is that?
Now you can go to the Massing & Site tab to create your Revit topgraphic model. Again, you need to know the layers the contours are on. If you still cannot make a topo from the dwg file then the contours may be flat with an elevation value of 0. The option then is to use the dwg as a template tand use the Place Point tool to create the topo map. If you are going to do any grading make sure the new topo Phasing is set to Existing. And I would give it a name like (e) topo - I used lower case for eixisting conditions like this.
Hope this helps,
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