The study tries to analyse and to collect the water footprints of nations. The water footprint of a nation consist of the total amount of used domestic water resources plus the virtual water flows entering the country minus the flows leaving the country.
CHAPAGAIN, A. K. HOEKSTRA, A.Y. (2004): Water Footprints of Nations - Volume 1: Main Report. (= Research Report Series No. 16 , 1 ). Delft: UNESCO-IHE, Institute for Water Education URL [Accessed: 12.10.2010]