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I am looking for a native QGIS solution only (QGIS Grass and SAGA plugins are okay too).

I am creating a plugin in QGIS to route pollutant loads through a DEM to create a weighted accumulated raster. There will be tens of pollutants and each will be routed on the same DEM. So I do not want to recreate the flow direction each time, but create it once and use the same to improve processing speed (otherwise r.watershed does the job).

I can create flow direction in QGIS using SAGA or GRASS but couldn't find a way to create weighted flow accumulation from flow direction raster.

r.accumulate of GRASS is not available in QGIS

There is another question that ask for any open source solution, but my question is specific to QGIS.

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