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Stream Definition- empty output

Question asked by Lady_Jane on Jul 24, 2017
Latest reply on Jul 26, 2017 by Lady_Jane

I am running stream definition and getting a raster with values from 1 to 255 rather than a simple 1 for all cells part of a stream. The raster is also completely empty (see attachment).
I am using an integer flow accumulation grid as input which was created by using the flow accumulation tool in spatial analyst. ArcGIS hangs whenever I try to create a flow accumulation grid using ArcHydro, or create a floating point grid using spatial analyst. I'm not sure why the integer one shouldn't work, though.

Has anyone encountered this issue before?