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Hydrology
Branch of earth science that deals with water as it occurs in the atmosphere, on the surface of the ground, and underground.
Subtopics:
Hydrodynamics (3 items)

Hydrologic maps (28 items)
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Results 151 - 160 of 411 listed by similarity [list alphabetically]
National Hydrography Dataset (NHD) [More info]
Main page for National Hydrography Dataset (NHD), a comprehensive set of digital spatial data about surface water features, with links to references, data, software tools, applications, tutorials, technical support, and data maintenance.
National Research Program (NRP) for water resources [More info]
The USGS National Research Program for water resources supports hydrologic research in support of the mission of the U.S. Geological Survey. Site provides links to search for current projects and for postdoctoral opportunities.
National research program (water resources), western United States [More info]
Home page for links to state district activities in water resources data collection, research, and analysis in the Western Region.
National Stream Quality Accounting Network (NASQAN) [More info]
Homepage for description of the National Stream Quality Network (NASQAN), a long-term program monitoring the concentrations and flux of sediment and chemicals in the Nation's largest rivers (Mississippi, Columbia, Colorado, Rio Grande, and Yukon).
National Streamflow Information Program [More info]
National Streamflow Information Program home page describing the operation and maintenance of 7000 streamgages, overview of the program, system for collection of streamflow data, maintaining of historic streamflow data, and available reports.
PDF National Streamflow Information Program: Implementation Status Report [More info]
Describes and explains why and how USGS and its cooperators operate about 7,500 stream gages nationwide, the types of information we obtain from them, and the problems that can be addressed as a result.
National water conditions [More info]
Historical maps and animations of maps for monthly and annual streamflow conditions by water year showing generalized contour patterns of streamflow conditions. Maps are for the United States, Canada, and Puerto Rico.
National Water Information System (NWISWeb) data for Illinois [More info]
National Information Water System (NWIS) water data for Illinois including real-time current conditions, streamflow data, site information, ground-water data, and water-quality data.
National Water Information System (NWISWeb) data for the Nation [More info]
NWISWeb homepage for the National Water Information System providing access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, and Puerto Rico.
National Water Quality Assessment urban studies portal [More info]
Multiple studies addressing urban water-quality issues, to describe biological, chemical, and physical characteristics of urban water resources over time, and relate those characteristics to natural processes and human activities
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