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World's surface water: evaporation and runoff

World's surface water: evaporation and runoff

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Uploaded 16 Feb 2012 by GRID-Arendal
Year: 2009
From collection: Vital Water Graphics 2
Author: Phillippe Rekacewicz (Le Monde diplomatique), February 2006
Description:
Because much of the world’s surface water is far from concentrations of human settlements, not all of it is readily usable. Some facts concerning global freshwater concentrations: - It is estimated that the freshwater available for human consumption varies between 12,500 km3 and 14,000 km3 each year (Hinrichsen et al., 1998; Jackson et al., 2001). - Many countries in Africa, the Middle East, western Asia, and some eastern European countries have lower than average quantities of freshwater resources available to their populations. - Due to rapid population growth, the potential water availability for the earth’s population decreased from 12,900 m3 per capita per year in 1970 to 9,000 m3 in 1990, and to less than 7,000 m3 in 2000 (Clarke, 1991; Jackson et al, 2001; Shiklomanov, 1999). - In densely populated parts of Asia, Africa and central and southern Europe, current per capita water availability is between 1,200 m3 and 5,000 m3 per year (Shiklomanov, 1999). - The global avai ...
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