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Water footprint

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Water footprint

  1. 1. A Comprehensive Introduction to Water Footprints Ó 2011 Arjen Y. Hoekstra Professor in Water Management – University of Twente – the Netherlands Scientific Director – Water Footprint Network www.waterfootprint.org
  2. 2. Overview - Freshwater scarcity & pollution - The water footprint of products - National water footprint accounting - The water footprint of a business - WF sustainability assessment - Response: reducing water footprints - Water Footprint Network
  3. 3. Freshwater scarcity and pollution
  4. 4. Signs of global water scarcity Strawberries for export Coto Doñana National Park, southern Spain
  5. 5. Signs of global water scarcity Cotton for export Former Aral Sea, Central Asia
  6. 6. Signs of global water pollution Devecser, Hungary, Oct. 5, 2010
  7. 7. Signs of global water pollution
  8. 8. The water footprint of a product
  9. 9. The water footprint of a product ► the volume of fresh water used to produce the product, summed over the various steps of the production chain. ► when and where the water was used: a water footprint includes a temporal and spatial dimension.
  10. 10. The water footprint of a product Green water footprint ► volume of rainwater evaporated or incorporated into product. Blue water footprint ► volume of surface or groundwater evaporated, incorporated into product or returned to other catchment or the sea. Grey water footprint ► volume of polluted water.
  11. 11. Components of a water footprint Direct water footprint Indirect water footprint Green water footprint Green water footprint Blue water footprint Blue water footprint Grey water footprint Grey water footprint consumption Water Water pollution [Hoekstra et al., 2011] Water withdrawal Return flow The traditional statistics on water use
  12. 12. The green and blue water footprint in relation to the water balance of a catchment area Runoff from Green water footprint Blue water footprint Production-related evapotranspiration Water contained in products Soil and vegetation Ground- and surface water catchment Precipitation Non production-related evapotranspiration Production-related evapotranspiration Abstraction Return flow Water transfer to other catchment Runoff at field level Catchment area Water contained in products [Hoekstra et al., 2011]
  13. 13. Assessing the blue and green process water footprint of growing a crop Water footprint of growing a crop

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