It seems I am unable to export proper 3D setting out data in the form of feature lines or 3D polylines for the base / top level of swales. I have designed several swales with a 1:200 gradient, but the export into C3D does not take into account the longitudinal fall and the z-values for all coordinates are set to the same top level / base level of the swale at its downstream end. This feature should be implemented if it has not been so properly already, as without additional man hours are required to create separate Civil3D models of the swales and export feature lines in those separate models - something that shouldn't be necessary through use of the Info Drainage software. Can ID advise that this feature has not yet been incorporated?
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