http://resources.arcgis.com/content/hydro-data-model
Actually it is not at this link. The link only leads you to an email address from which to request download instructions which are supplied promptly.
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The FTP site link no longer works and and link at esri (http://resources.arcgis.com/content/hydro-data-model) for ArcHydro for 9.2/9.3 doesn't work. I've been trying to find archydro for 9.3 now for about an hour-should it be this hard?
Thanks,
Stephanie