[GRASS-user] Re: Hydroligics in grass

[Joop Goedbloed]

Op 11-12-09 20:44, Joop Goedbloed schreef:
> 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 <ftp://192.168.2.107/houtblerick/teracc.png>
>
> Using the r.watershed module resulting  streammap is here:
> Watershed stream map <ftp://192.168.2.107/houtblerick/wsstream.png>
>
> In both maps the red boxes are the complaints of water flood
> A foto of the real situation is here
> Foto <ftp://192.168.2.107/houtblericj/Holleweg.jpg>
>

For the puctures try ftp://80.61.251.86/Houtblerick/
there are the tree pictures.
> Thanks
>
> Joop Goedbloed
>

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