[GRASS-user] Re: understanding r.watershed

[M S]

Since a lake stores water, it sounds reasonable to consider it a
depression.  That is what I used on an internally drained watershed, and it
worked well.

More or less a feature you determine will "hold water", and not overland
flow.  The other areas of all have flow characteristics (e.g.
accumulation,direction).

Mark

On Thu, Jan 29, 2009 at 10:49 AM, Georg Kaspar <georg at geofs.de> wrote:

> On Thu, 29 Jan 2009 10:20:36 -0500, M S wrote:
>
> > In short, r.watershed, without depression input,  will route water in
> > and *up* and out of depressions in the terrain to illustrate the
> > complete downward path.  This is why no DEM filling is necessary.  By
> > entering in known (substantial and impactful) depressions, the water
> > does not route out of it.
>
> But in my case, providing known depressions leads to areas of null()s
> around those depressions (lakes by the way).
>
>
>
>
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