GRIDATB.FOR is available from http://www.es.lancs.ac.uk/hfdg/topmodel.html.
As of May 2008, this webpage no longer exists; the closest I could find was
http://www.es.lancs.ac.uk/hfdg/freeware/hfdg_freeware_top.htm, and all of the
available software on this page seems to VBA/Windows only.
~ Eric Patton.
Thanks to Keith Beven.
[r.in.gridatb]
imports GRIDATB map file.