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Institute of Hydraulic Engineering, University Stuttgart
Water quality and how aquatic life (fish, invertebrates, algae) is used to measure the overall health of the nation's waters. Lots of links to state and federal programs as well as other sites.
Internet directory, webring, online forums, and international workshops intended to promote the sharing of information concerning water and the earth's environment.
Branch of the USDA Agricultural Research Service (ARS) collecting water resource related data to monitor the environment as it is affected by land use.
Home page for water resources information from the U.S. Geological Survey. Topics include ground water, surface water, water use, water quality, acid rain, toxic substances hydrology.
Information on quantities and forms of water worldwide, including discharge of rivers, as well as water use and demand. From UNESCO and Russian State Hydrologic Institute.