With many things in Civil3D, it’s not readily apparent what you need to do.  Here is a step by step procedure on how to import FLT fault files.  These files are ASCII files you can drag/drop into a notepad and you will see “#AdCADD DTM 12.00 User defined fault file” followed by numerous lines of coordinates.

Create a surface if you haven’t already:

  1. Select the Prospector Tab on the Toolspace panel.
  2. Right click Surfaces and choose create surface.
  3. Optionally specify a different surface name.
  4. Click OK to create the surface.
  5. Expand the surfaces branch and your surface.

Add the fault file to the definition.

  1. Right click the Brealines item under your surface definition.
  2. In the Add Breaklines dialog, choose Type: From File
  3. Optionally change the link option, we choose to break the link.
  4. Click the OK button.
  5. Navigate to your FLT file and select it.

You may need to zoom extents to see the contents of the fault file.

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