location == BC Control File (.tbc)

command == Read GIS SA

description == Used to define the location of internal source area flow verse time boundaries.

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

manual link == https://downloads.tuflow.com/_archive/TUFLOW/Releases/2018-03/TUFLOW%20Manual.2018-03.pdff
manual page == 323