Using this graphic and referring to it is encouraged, and please use it in presentations, web pages, newspapers, blogs and reports.
For any form of publication, please include the link to this page and give the cartographer/designer credit (in this case Philippe Rekacewicz, UNEP/GRID-Arendal)
Peter H. Gleick, 'Water in Crisis', New York, Oxford University Press, 1993.
Uploaded on Saturday 25 Feb 2012
World's surface water: precipitation, evaporation and runoff
Philippe Rekacewicz, UNEP/GRID-Arendal
The world's surface water is affected by different levels of precipitation, evaporation and runoff in different regions. This graphic illustrates the different rates at which these processes affect the major regions of the world, and the resulting uneven distribution of freshwater. It shows the amount of precipitation in cubic kilometres for each region, and the percentage of that amount which evaporates or becomes runoff. The text below the graphic discusses the uneven global availability of freshwater and its implications.