location == ESTRY Control File (.ecf)

command == Read GIS Network

description == Used to define channel and node locations and attributes. Common channel types include, open channels, culverts, bridges, weirs. The difference between the 1d_nwkb and standard 1d_nwk is that the pblockage attribute field accepts characters allowing the user to input matrix blockage.

wiki link == https://wiki.tuflow.com/TUFLOW_Empty_Files#ESTRY_Control_file_.28ECF.29

manual link == https://docs.tuflow.com/classic-hpc/manual/2025.1/OneD-Domains-1.html#Blockage-4