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Learn how water is distributed on Earth by volume, percentage and area, and how it varies by salinity and form. Find out that 97.5% of water is salt water and 2.5% is fresh water, and that only 0.3% of fresh water is liquid on the surface.
Watersheds are large drainage basins that drain to different oceans, seas, or endorheic basins. Learn about the seven principal watersheds of North America, their boundaries, rivers, and endorheic basins.
The water cycle is a biogeochemical cycle that involves the continuous movement of water on, above and below the surface of the Earth. It involves evaporation, condensation, precipitation, and other processes that affect the climate, the environment, and human activities.
This web page provides a table of artificial lakes with a capacity greater than or equal to 1,000,000 acre-feet (1.2 km 3 ). It also includes information on the dams, rivers, and years of construction of each reservoir.
Learn about different ways of storing water for consumption and agriculture, such as groundwater, soil moisture, wetlands, ponds, tanks, dams and reservoirs. Find out the benefits and challenges of water storage, such as contamination, evaporation, flood control and food security.
The inland waterways of the United States include more than 25,000 mi (40,000 km) of navigable waters, mostly in the eastern half of the country. The Mississippi River System is the most important waterway for ocean shipping and barge traffic, connecting Gulf Coast ports with major inland ports and the Great Lakes.
Learn about the history and operation of the city's water supply system, which includes aqueducts, reservoirs, and tunnels from three major sources: Croton, Catskill, and Delaware. The system is one of the most extensive and protected in the world, providing fresh water to over 8.6 million residents and visitors.
A partial list of major dams and reservoirs in the US by state, with links to more information. The list includes the height, capacity, and location of each dam, as well as its function and history.