[GRASS-dev] New addon r.accumulate calculates weighted flow accumulation using a flow direction map

Huidae Cho grass4u at gmail.com
Thu Jun 21 22:34:13 PDT 2018

Hi All,

I just committed a new addon r.accumulate (
Unlike r.watershed, this module calculates weighted flow accumulation
directly from the flow direction map and does not require the original
elevation data. I wrote this module many years ago for GRASS 6, but I
almost forgot about it until I read this question:


Huidae Cho, Ph.D., PE, M.ASCE, CFM, GISP
Senior Geospatial Engineer, MapAnything
Open Source GIS Developer, GRASS GIS Development Team
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