Nathan, ArcHydro is pretty much fully functional for ArcGIS 10, ver 2.0.0.80 was built Dec 22, 2010 and posted to the Water Resources ftp site, and it bundles AppFramework ver 4.0.0.22. The embedded Help and Tutorial were updated Nov 15, 2010. But, as has been well publicized the HEC GeoRAS and GeoHMS will not be updated in the near term for ArcGIS 10. So if your needs center on preprocessing support for HEC RAS or HMS, you'll need to stay with ArcGIS 9.3 Stuart Stuart, How can I access the Water Resourses ftp so I can download Arc Hydro 2? Thanks, Eric
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