Baxter,
Since you're already at ORSTOM have you tried to
talk things over with Christian Depraetere. I
believe he should be in Montpellier again. I think
he's attached to the Laboratory of Hydrology. He
has alot of experience in catchment delineation and
I'm sure he would be interested in your work with GRASS.
Cheers,
Colin McClean
Centre for Land Use and Water Resources Research
University of Newcastle-Upon-Tyne
England