r.drain

[Michael Shapiro]

I would recommend that your write a module that follows the pointers
generated by the drainage option of r.watershed. You should do this
int C, but you could do it using the shell and the [] neighborhood
modifiers in r.mapcalc.
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Michael Shapiro                        U.S. Army CERL                  
email:   shapiro@zorro.cecer.army.mil  Environmental Division          
phone:   (217) 352-6511  ext 526       P.O. Box 9005                   
fax:     (217) 373-7222                Champaign, Ill. 61826-9005
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