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activities Administration agencies agricultural aquifer areas Assessment atmosphere Award Bureau Center City coal Colorado comet Comet Shoemaker-Levy 9 Commission concentrations contaminant cooperation in earth County Water data sets database debris flows deposits discharge distribution diversity Division DSDL earth science environment Federal flood floodplain geographic information systems Geological Survey USGS GeoMedia geospatial data global ground-water hazards High Plains hydrologic impact Internet Irrigation kilometers Lake land levees levels locations Management District maps ment methane Mineral Resources Mississippi River monitoring Mount Rainier Municipal natural gas nitrate Northridge earthquake NSDI pesticides petroleum Planning Reston River Basin SAST Scientific and technical scientists sediment seismic Service South Platte River spatial data studies technical cooperation Telephone tion Transportation U.S. Geological Survey U.S.-Mexico border University users USGS Valley videoconferencing Volunteer Water Authority Water Conservation District Water District Water Resources