"Watershed" function excludes edges of overall catchment

Discussion created by erictomic on Oct 24, 2011
Latest reply on Nov 9, 2011 by erictionism
I was able to break up a catchment into its subcatchments except in some edges where a straight boundary seem to have excluded some areas.  In using the Watershed function, I have derived a 'sinkless' DEM from which I obtained the flowdir and flowacc layers.  The pour points used in defining the subcatchments were derived from the flowacc layer.

Attached is the screenshot of this watershed layer over the flowacc layer.

Please advise on what could be causing these straight edge exclusions and what could be done to overcome this problem.