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You can use Saga "Upslope area" geoalgorithm. You must install Saga and configure the path where you installed Saga inside QGIS in Processing->Options or Ctrl+Alt+C. Then expand Providers->Saga, set up the folder and mark Active. If you installed through osgeo4w you just need to restart qgis and you should be done. Then open up the toolbox Ctrl+Alt+...

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