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Flow accumulation usually stores very large numbers, because cell value= count of discharging cells. It is unlikely that tif is capable of storing values in this range


You have to create your own weight raster or use information for the study area. The help file quotes an example of the type of data you might have available... "A sample usage of the Flow Accumulation tool with an input weight raster might be to determine how much rain has fallen within a given watershed. In such a case, the weight raster may be a ...


Choosing the right algorithm for hydrologically correcting a DEM really depends on your particular application. DEM size is certainly an issue, as you discovered. If you have a massive DEM, there are only a few algorithms that will work for your application. Another important consideration is whether or not all of the topographic depressions in your DEM are ...

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