As an addition to the earlier tips. I just found that when I put the mxd in a folder with a simple name and no spaces, the Terrain Processing with Arc Hydro ran without a hitch. Today I happened to look in the "log" file in the raster folder for the project and saw that a raster name was cut off. In the example below you can see that the flow accumluation file name was cut off after the "f". 201201251045 0 1 0mboucher P:\GIS USERS - Projects\Arc Hydro\Research\Project2\Fdr = FLOWDIRECTION(P:\GIS USERS - Projects\Arc Hydro\Research\Project2\Fil
201201251050 0 1 0mboucher P:\GIS USERS - Projects\Arc Hydro\Research\Project2\Fac = FLOWACCUMULATION(P:\GIS USERS - Projects\Arc Hydro\Research\Project2\f Putting the project in a simpler folder name with no spaces resluting int the "log" file looking like this: 201201251407 0 0 0mboucher P:\ArcHydro\Test\Project4\Fdr = FLOWDIRECTION(P:\ArcHydro\Test\Project4\Fil, #, NORMAL)201201251407 0 1 0mboucher P:\ArcHydro\Test\Project4\Fac = FLOWACCUMULATION(P:\ArcHydro\Test\Project4\Fdr, #, FLOAT)
201201251407 0 0 0mboucher P:\ArcHydro\Test\Project4\str = CON(C:\Users\mboucher\AppData\Local\Temp\AH20120125140707\condgeo, C:\Users\mboucher\AppData\Local\Temp\AH20120125140707\condgeo)
201201251407 0 1 0mboucher P:\ArcHydro\Test\Project4\StrLnk = STREAMLINK(P:\ArcHydro\Test\Project4\str, P:\ArcHydro\Test\Project4\Fdr) You can see that their is much more to the file name and some other info. I don't know if there is a limit to the length of the path or if some functions don't like the spaces in the path. Eitherway, I'm going to keep things short and spaceless for a while and see if that works. I've been aware of naming problems when there were spaces, but that hasn't seemed to cause a problem before. I've always muscled through it. With this change in practice, I used the canned terrain processing model with no problems.
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