Water footprint is an indicator of fresh water use that looks at both the direct and indirect water use of a consumer or producer. The idea was first proposed by a Dutch water expert and Professor John Anthony Allan of King's College London won the Stockholm Water Prize for his invention of the concept of Virtual Water which is also a way to calculate the water footprint, in parallel to the carbon footprint.
It is also a way to see water from consumption perspective. For example to produce one kilo wheat needs 100 liter water, but to produce one kilo beef needs 1600 liter water. Therefore, people's eating habits affect the consumption of water. Professor Liu Junguo from Beijing Forestry University conducted a research on China's water footprint which aroused great attention from the World Water Week held in Stockholm on August 16-22.
http://www.chinawater.net/html/view.asp?id=5725
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