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)
Igor A. Shiklomanov, State Hydrological Institute (SHI, St. Petersburg) and UNESCO, Paris, 1999; Max Planck, Institute for Meteorology, Hamburg, 1994; Freeze, Allen, John, Cherry, 'Groundwater': Prentice-Hall, Englewood Cliffs, NJ, 1979.
Uploaded on Saturday 25 Feb 2012
World's water cycle: schematic and residence time
Philippe Rekacewicz, UNEP/GRID-Arendal
The water cycle consists of precipitation, evaporation, evapotranspiration and runoff. This graphic explains the global water cycle, showing how nearly 577 000 km3 of water circulates through the cycle each year. A table of estimated residence times of the world's water shows the estimated times that water resources exist as biospheric water; atmospheric water; river channels; swamps; lakes and reservoirs; soil moisture; ice caps and glaciers; oceans and seas, and groundwater. The estimated residence times range from one week to 10,000 years.