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Hydrology Flow Direction tool output "incorrect" when setting z limit

Question asked by geonetadmin on Jun 3, 2011
Latest reply on Jun 20, 2013 by geonetadmin
Original User: wesley.king

ArcGIS v10 sp1, 64 bit Vista:
I've never seen this happen before, but I haven't done a hydrology analysis since installing v10.  When running the Fill tool and not setting the z limit (defaulting to fill all), then running flow direction the output is as expected...values of; 1,2,4,8,16,32,64,128.  Then running flow accumulation with with directional raster works as expected (see attachment).
BUT
When running the Fill tool and setting the z limit (trying about 8 different values), then running flow direction the output is NOT as expected...cells with values ranging 1-255.  Then running flow accumulation with this directional raster results in output that is obviously wrong (see attachment).

Anyone have any idea what's happening?

Thanks in advance,
Wes

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