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The ‘water footprint’ of a country is defined as the volume of water needed for the production of goods and services consumed by the inhabitants of the country. The water footprint of a country can be calculated with either the top-down approach or bottom-up approach. In the top-down approach, one calculates the water footprint as the sum of water use in the country plus gross virtual water import into the country minus gross virtual water export. In the bottom-up approach, we aggregate the individual water footprints of the inhabitatants of a country to get the total water footprint of a country. Individual water footprints are calculated by multiplying all consumed goods and services with their respective virtual water content.