I have been trying to create the longest flow path per subcatchment. I already have a subcatchment file, so it appears the only steps I need to perform are the DEM Manipulation (I only did fill sinks - and I've tried it without doing this step, but it seems I get better results when I run this command) and then I use that output to run the Flow Direction. In Flow Direction, I use the subcatchment file as the Outer Wall Polygon (again I seem to get better results when I do this). Then I run the Longest Flow Path for Catchments using the FDR grid and my subcatchment file. I have ran these tools many, many times. I've ran just these, I've ran all of them under Terrain Preprocessing, I've ran different combinations, but even running just these few tools I end up with different results each time. But I now have a file that doesn't look too bad, but still quite a ways from what I expected. Sometimes it doesn't create the flow path all the way through the subcatchment, sometimes it doesn't create a flow path at all for particular subcatchments, sometimes it creates multiple flowpath for a subcatchment. What am I doing wrong? Is there anyway someone would be will to look at what its producing and let me know what they think about the results? Thanks for any input!
Here is a layered PDF showing the DEM, subcatchment boundaries and the flow paths the tool most recently created - [ATTACH=CONFIG]29497[/ATTACH]
