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When importing a LandXML file, catchbasins are imported as manholes.Problem ID#: 36570
If an inlet in Civil3D is set up as a "General Structure" or a "Junction Structure" (which is what most of the predefined Parts in the Civil 3D Parts Catalog are) then it will import into StormCAD as manholes, as the expected result.If you would like to import them as catch basins, they will need to be configured as an Inlet-Outlet Structure type in Civil 3D. Inlet-Outlet Structures are exported to LandXML as a "Struct" type which maps to a StormCAD Catch Basin.
Setting up a parts library in Civil3D for LandXML import