http://blogs.esri.com/Info/blogs/gisedcom/archive/2008/09/26/teaching-about-watersheds-with-online-and-3-d-gis-part-2.aspxAnother excellent resource to teach about watersheds from a spatial perspective is the EPA’s Surf Your Watershed site ( http://cfpub.epa.gov/surf/locate/index.cfm ). For each watershed, environmental threats, streamflow, citizen-based action groups, andenCommunityServer 2.1 SP2 (Debug Build: 61120.2)