location == Geometry Control File (.tgc)

command == Read GIS IGW [ Depth | Level ]

description == Ground water depth or level inputs.

wiki link == https://wiki.tuflow.com/TUFLOW_Empty_Files#TUFLOW_Geometry_Control_file_.28TGC.29

manual link == https://docs.tuflow.com/classic-hpc/manual/2026.0/Boundaries-InitialConditions-1.html#IGW-3