location == Geometry Control File (.tgc)

command == Read GIS Z Line

description == Used to update topography within a model. Polylines are treated as breaklines in the model’s topography (with the breakline height or elevation varying along its length). This command has been superseded with the TGC commands:\n\tRead GIS GIS Z Shape\n\tThe template file and command only remain for the purpose of version backward compatibility.

wiki link == https://wiki.tuflow.com/index.php?title=TUFLOW_Empty_Files#TUFLOW_Geometry_Control_file_.28TGC.29

manual link == https://downloads.tuflow.com/_archive/TUFLOW/Releases/2018-03/TUFLOW%20Manual.2018-03.pdf
manual page == 257