[GRASSLIST:4613] r.watershed - blocking map

[andres javier garcia garcia]

Hi;
I'm using the r.watershed module and it works properly; but when I add a 
blocking map to the input, the proccess fails eventually; just when it seems 
to have finished.

My aim is to force the streams generated by r.watershed, to go in one 
direction, slightly different than the one created from the dem.
So I've created a blocking map with a couple of lines in the zones of concern.
Is this correct?

If so. Is anyone using this program and can give me an advice?

Thanks
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Javier