[Qgis-user] Watershed - Catchment area upstream of a point

[Shinoto, PD Dr. Maria]

Hi, 

I have used SAGA for hydrological analyses following the instructions in Hans van der Kwast's excellent book on hydroloy in QGIS. It worked well in my Japanese environment, but I forgot about the details. 

Still, Hans van der Kwast also showed how to use GRASS for the same purpose. I tried it, it was more hassle than SAGA so I stayed with SAGA. But, maybe it helps you. 

There is an instructional video on YouTube: 

	https://www.youtube.com/watch?v=aTYHpft1gus

If you did not watch his instructions on using SAGA for that purpose, you may watch his YT videos to check whether you did not forget a step inbetween?

Best, 
Maria

> Am 2022-11-09 um 07:04 schrieb Tony Shepherd (FarmMaps NZ) via Qgis-user <qgis-user at lists.osgeo.org>:
> 
> Hi All
>  
> I’m wanting to use a DEM/DTM to automatically map the watershed/catchment area upstream of a known point.
>  
> After a bit of reading, this appears to be a not-so-simple task but suggestions are to use the “Upslope Area” algorithm. 
>  
> In my case, the program fails to finish running, and the message window shows the following error:
>              SAGA Version: 7.8.2 (64 bit)
>              Error: tool needs graphical user interface [Upslope Area]
>              C:\Users\Tony\Documents>exit
>  
> Questions:
> 	• Does anybody know what that error means?
> 	• Is there another tool/method that is preferable to use? 
>  
> Cheers
> Tony
>  
> Tony Shepherd  |  GeoSpatial / Mapping Manager
>  
> Ph 027 435 6193  |  E tony at farmmaps.nz  |  W shepherdphotos.co.nz
>  
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