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Water resources are natural resources of water that are potentially useful for humans, for example as a source of drinking water supply or irrigation water. These resources can be either freshwater from natural sources, or water produced artificially from other sources, such as from reclaimed water or desalinated water (). 97% of the water on Earth is salt water and only three percent is fresh ...
Most water in Earth's atmosphere and crust comes from saline seawater, while fresh water accounts for nearly 1% of the total. The vast bulk of the water on Earth is saline or salt water, with an average salinity of 35‰ (or 3.5%, roughly equivalent to 34 grams of salts in 1 kg of seawater), though this varies slightly according to the amount of runoff received from surrounding land.
Out of all the water on Earth, saline water in oceans, seas and saline groundwater make up about 97% of it. Only 2.5–2.75% is fresh water, including 1.75–2% frozen in glaciers, ice and snow, 0.5–0.75% as fresh groundwater and soil moisture, and less than 0.01% of it as surface water in lakes, swamps and rivers.
Share of the population without access to an improved water source, 2020. Global access to clean water is a significant global challenge that affects the health, well-being, and development of people worldwide. While progress has been made in recent years, millions of people still lack access to safe and clean drinking water sources.
List of bodies of water by salinity; List of oceans; List of seas. List of gulfs; Lists of bays List of gulfs; List of bays and coves of Jamaica; List of bays in Hong Kong; List of bays in the Azores; List of bays of Dominica; List of bays of South Africa; List of bays of the British Isles; List of bays of the Philippines; List of bays of the ...
The list of drainage basins by area identifies basins (also known as "catchments" or, in North American usage, "watersheds"), sorted by area, which drain to oceans, mediterranean seas, rivers, lakes and other water bodies. All basins larger than 400,000 km 2 (150,000 sq mi) are included
The following is a list of reservoirs and dams, ... Tajchy artificial water reservoirs in the ... Text is available under the Creative Commons Attribution ...
Frequently, the effective minimum volume is greater if the water is needed for a purpose behind a dam. Available capacity May require knowing the reservoir's primary purpose. If it is designed to prevent flooding, it may be the volume of water that can be retained before reaching maximum or top water. Actual Current