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So I'm following steps in another topic that seems to date to January of this year and is exactly what I want to do, here's the link: Get drainage basin of a polygon and at one of the last steps in Mr. Micha's explanation (who has helped me a lot this past week) in which he suggests to run r.stream.basins using the flow direction map as input and intersection points as parameter, I can't find any algorithm asking for such a parameter. I have everything that is needed (Flow direction as well as Intersection points) and have been browsing for a few hours to no avail. I'm wondering if it's my QGIS version or simply GRASS GIS 7 not having such a function.

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The module r.stream.basins is an addon:

https://grass.osgeo.org/grass72/manuals/addons/r.stream.basins.html

In order to use it from QGIS, you need to have the module being installed in the underlying GRASS GIS installation.

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  • Thanks for this enlightening answer, I had no idea GRASS was actually a GIS in it'self. I will keep you up to date on the result.
    – Louis
    May 5, 2017 at 13:38
  • Here you find more addons: grass.osgeo.org/grass72/manuals/addons
    – markusN
    May 8, 2017 at 5:44

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