[Qgis-user] River Flood modelling

[Stefan Blumentrath]

Hi,

Recently there has been a discussion on a similar task:
https://lists.osgeo.org/pipermail/grass-user/2018-September/079127.html
Where solutions were discussed for manually digitized streams.

If you however can live with deriving streams from a terrain module, I would use the r.stream.* modules for this job:
https://grasswiki.osgeo.org/wiki/R.stream.*_modules
Especially, r.stream.distance:
https://grass.osgeo.org/grass74/manuals/addons/r.stream.distance.html

Hope that helps.

Cheers
Stefan 


-----Original Message-----
From: Qgis-user <qgis-user-bounces at lists.osgeo.org> On Behalf Of Jonathan Moules
Sent: fredag 25. januar 2019 23:55
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] River Flood modelling

Hi Nicolas,

If you don't get a reply here that solves your issue it may be worth asking on the GRASS mailing list. I know GRASS has a lot of hydrographic tools and it's integrated into QGIS so...

https://lists.osgeo.org/mailman/listinfo/grass-user

Jonathan


On 2019-01-25 06:52, Nicolas Cadieux wrote:
> Hi,
>
> I know it can't be that simple but I would like to model a river flood 
> in a mountainous area.  I am looking for something like the Saga Lake 
> flood module with a LiDAR derived DEM, a seed but with the possibility 
> to add X amount of water.  It's basically a lake and dam scenario and 
> you just add water and figure out where the water goes down the valley 
> when it goes over the dam.  Of course I can't use the normal lake 
> flood modules because rivers are not flat therefore I need something 
> that takes the downhill valley shape into consideration.  Also, I am 
> not looking for a simple channel network map with lines and points.  I 
> would like the actual polygon or raster representation of the 2D shape 
> of the river channel.  Can you please point me in the right direction.
>
> Nicolas
>
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