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The total volume of water on Earth is estimated at 1.386 billion km 3 (333 million cubic miles), with 97.5% being salt water and 2.5% being freshwater. Of the freshwater, only 0.3% is in liquid form on the surface. [2][3][4] Because the oceans that cover roughly 70.8% of the area of Earth reflect blue light, Earth appears blue from space, and ...
1988. The United Nations World Water Development Report (WWDR) is a global report that provides an authoritative, comprehensive assessment of the world’s freshwater resources. It is produced annually by the UNESCO World Water Assessment Programme and published by UNESCO on behalf of UN-Water. [1]
Fresh and unpolluted water accounts for 0.003% of total water available globally. [3] According to World Bank, India and Brazil has the highest freshwater resources per capita in 2024, ″renewable internal freshwater resources flows refer to internal renewable resources (internal river flows and groundwater from rainfall) in the country.″. [4]
Irrigation schemes in the world use about 3 500 km 3 water per year, of which 74% is evaporated by the crops. [7] This is some 80% of all water used by mankind (4 400 km 3 per year). The water used for irrigation is roughly 25% of the annually available water resources (14 000 km 3) and 9% of all annual river discharges in the hydrological cycle.
The UNESCO World Water Assessment Programme (UNESCO WWAP) was founded in 2000 in response to a call from the UN Commission on Sustainable Development (CSD) to produce a UN system-wide periodic global overview of the status (quantity and quality), use and management of freshwater resources. To meet this challenge, WWAP coordinates the work of 31 ...
Water distribution network is the term for the portion of a water distribution system up to the service points of bulk water consumers or demand nodes where many consumers are lumped together. [5] The World Health Organization (WHO) uses the term water transmission system for a network of pipes, generally in a tree-like structure, that is used ...
This list of water supply and sanitation by country provides information on the status of water supply and sanitation at a national or, in some cases, also regional level. Water supply and sanitation by country [ edit ]
An improved water source, as defined by the World Health Organization (WHO), refers to a drinking water source that provides adequate and safe water for human consumption. Examples of improved water sources include piped water connections, protected wells, boreholes with hand pumps, packaged or delivered water and rainwater collection systems ...