Weighted Flow Accumulation Issue

Discussion created by peacockb on Sep 16, 2010
Latest reply on Nov 10, 2010 by awade
I have run into a snag trying to get a weighted flow accumulation to work.  I am working with data that is of relatively low resolution (50m) over an area that is approximately 10km x 25km.  I have made sure that the data is in the same coordinate system at the same resolution and the pixels are perfectly aligned.  However, when I run it, it just says "Updating Flow Accumulation" for hours. I have run it overnight and it has not changed.  When I try to cancel it the program stops responding and I have to restart ArcGIS. I also tried this on a different computer.

What can I do to get it to work and are there any programs that will do a weighted flow accumulation with a more advanced algorithm then the D8?  Thanks.