[GRASSLIST:10410] flow direction in r.terraflow, r.watershed and r.fill.dir --> r.water.outlet

[José Miguel Delgado]

Hello,

I would like to know the difference between the output "direction" in 
r.terraflow and the output map "drainage" in r.watershed. I wanted to 
run r.water.outlet and its input is "drainage", which can be obtained 
by r.watershed. However, r.watershed takes much more time to run than 
r.terraflow.

I tried r.water.outlet, inputing  "direction", obtained from 
r.terraflow, and it didn't work.
I also tried inputing the "direction" raster map that I obtained from 
r.fill.dir, and didn't work.

The result obtained when I say "didn't work" was a raster full of zeros.

As I am a beginner I may have done something wrong before, so I would 
like to know more about it before proceeding.

Thank you for the help,

--
José Miguel Delgado
jmmd at mega.ist.utl.pt
+351 96 640 72 09
+46 73 573 23 89