[Qgis-user] River Flood modelling

[Nicolas Cadieux]

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