determine longest flow path for large basin using ArcGIS 1

[JZZz]

Hi,

Do any of you know any good plugin or tools for ArcGIS to determine longest flow path for a large basin (500 square miles)?

I tried ArcHydro, which is not reliable? also tried Miscellaneous Hydrology Tools for ArcGIS (

https://www.arcgis.com/home/item.html?id=fc7c1ca07e4844d7b722049b503b0fb2),

but is not working for me. I am using ArcMap 10.8.1 with Spatial Analysis extension. Does anybody knows the other tools that will solve the longest flow path problem? Thanks in advance.

 

[Ekenny_G]

Have you tried using USGS Streamstats? You may be a able to get Streamstats to get you started, its similar to ArcHydro. Again, it all depends on your outfall location. For such a huge area, the watershed should include a tributary/stream/river....which is likely to be delineated in USGS Streamstats.