How to get the upstream average of a raster data layer that falls into a river networ

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I have a raster layer of a network of rivers and a raster layer of data I want to extract.

For each pixel of the rivers, I need to know the upstream average of the data layer that falls into the river. Kind of like a mix between Flow Accumulation and Zonal Statistics.

I have access to ArcGIS 10.1 and QGIS 2.8.2.



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