Definition:
The water in the lakes, rivers and aquifers. Blue water occurs in two different forms: surface runoff in surface water bodies and renewable groundwater runoff in the aquifers.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO, 2005, Key Water Resources Statistics in AQUASTAT, By Jean Margat, Karen Frenken, Jean-Marc Faurès