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://www.tuflow.com/Download/TUFLOW/Releases/2017-09/TUFLOW%20Manual.2017-09-AC.pdf
manual page == 322