Key water resources statistics in AQUASTAT
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This article describes the methodology used by AQUASTAT to assess natural and actual freshwater resources for the world by country. It deals with renewable water resources and concentrates mainly on the physical assessment of internal and external resources. It presents a picture of the state of the world’s water resources that is not only the natural state but also the current situation, taking into account existing uses of water and their implications for countries sharing river basins. Much remains to be done in order to obtain sound statistics on water resources, and particularly standardized data sets, at global level. This article presents some reflections in this sense.
Submitted for IWG-Env, International Work Session on Water Statistics, Vienna, June 20-22 2005.