I want to run this tool from Qgis 2.2 but i don't know how to use the PARAMETERS to run this tool.

enter image description here

The red frame are the PARAMETERS I don't know.

Can someone to tell me what those PARAMETERS are and what they mean?

  • Why don't you just google??? grass.osgeo.org/grass64/manuals/r.watershed.html
    – Curlew
    May 11, 2014 at 13:54
  • hello what is locations of real depressions ? what is amount of overland flow per cell ? what is amount of overland flow per cell ? what is terrain blocking overland surface flow, for USLE ?
    – hellas
    May 11, 2014 at 14:30

1 Answer 1


If you look closely, not all of those parameters are required. To obtain the watersheds, you simply need to specify the input elevation model, a name for the output basins map and a threshold (cell units) to tell the software at which level to aggregate subwatersheds. In the worst case check the r.watershed manual which is also in the "help" tab of your screenshot ;-)

  • I particularly interested for USLE output parametres
    – hellas
    May 11, 2014 at 16:59
  • if i use your details and run this tools (LS) factor for USLE and (S) factor for USLE outputs is empty raster
    – hellas
    May 11, 2014 at 17:05
  • See grasswiki.osgeo.org/wiki/Computational_region --> FAQs -> Q: I don't see anything! -> Answer... (on that page)
    – markusN
    May 12, 2014 at 17:39

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