The green, blue and grey water footprint of rice from both a production and consumption perspective

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Chapagain, A.K. and Hoekstra, A.Y. (2010) The green, blue and grey water footprint of rice from both a production and consumption perspective. [Report]

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Abstract:The aim of this report is to make a global assessment of the green, blue and grey water footprint of rice, using a
higher spatial resolution than earlier studies and applying local data on actual irrigation. Evapotranspiration
from rice fields is calculated with the CROPWAT model; the distinction between green and blue water
evapotranspiration is based on data on precipitation and irrigation. Water pollution from N-fertilisers is
estimated based on application rates. The calculated green, blue and grey water footprints of paddy rice are
converted into estimations of the green, blue and grey water footprints of derived rice products on the basis of
product and value fractions. International virtual water flows related to trade in rice products are estimated by
multiplying trade volumes by their respective water footprints in the exporting countries. We take both a
production and a consumption perspective. Per nation, the total water footprint of rice production is estimated
by aggregating the water footprints per production region. Next, for each nation, the water footprint of rice
consumption is estimated by looking in which regions of the world the rice that is consumed in that nation is
produced. The water footprint of rice consumption in a nation is calculated by aggregating the water footprints
in the regions where the rice consumed in a nation is grown. For rice importing countries, the water footprint
related to rice consumption is thus partly (or fully) outside the country itself.
Item Type:Report
Copyright:© 2010 UNESCO-IHE Institute for Water Education
Faculty:
Engineering Technology (CTW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/77194
Publisher URL:http://www.unesco-ihe.org/research/publications/
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