How can I calculate flow length in QGiS/GRASS?

[المشرف العام]

I have these rasters:

1. DEM
2. Flow Direction
3. Flow Accumulation

I would like to calculate the flow distance of every pixel to the outlet of a basin.

In Arc-GIS, I can use the flow length. But I don't have access to a license right now. Any other open source way to do it?



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