[GRASS-user] Hydroligics in grass

[stephen sefick]

I can't get to any of the pictures.  r.terraflow and r.watershed are
both using lowest neighbor in eight directions to rout flow - SFD =
single flow direction and MFD is multiple flow direction.

On Fri, Dec 11, 2009 at 1:44 PM, Joop Goedbloed <jlgoedbloed at hetnet.nl> wrote:
> Hi Users on the list
>
> To trace back the overland flood mechanism in (sub)urban area I've done some
> experiments in grass.
> (Sub)urban areas has in general a sewer-system (combined or storm).
> One of the design-parameters of a sewer is the maximal capacity of rainfall,
> in most cases e sewer is design
> to carry off about 20mm/h rain.
>
> In case of very heavy storm about 60 mm/h the sewer becoms full and an
> overland flood mechanism come into being.
>
> I've a 5x5 meter grid DEM of the area.
> In grass there are several modules to simulate overland flood.
>
> * r. terraflow
> * r.watershed
> * r.topmodel
> * r.topidx
>  ...
>
> What is the most useful module(s) in grass to simulate overland flood
> mechanism?
>
>
> First I used the r.terraflow module the resulting accumulation map is here:
> Terraflow accumulation map
>
> Using the r.watershed module resulting  streammap is here:
> Watershed stream map
>
> In both maps the red boxes are the complaints of water flood
> A foto of the real situation is here
> Foto
>
> Thanks
>
> Joop Goedbloed
>
>
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>



-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis