Research: Water, water, everywhere

NWISWeb Data for the Nation (the title is an example of a government bureaucrat getting wild) provides access to water resources data collected at 1.5 million sites in the fifty states, D.C. and Puerto Rico. You can search for information by Surface Water, Ground Water, and Water Quality, as well as Real-Time data for selected sites. In short, more water data here than you can shake a dowsing stick at. <http://waterdata.usgs.gov/nwis>