Water: Difference between revisions
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|KeyReference=Rost et al., 2008; Gerten et al., 2004; Biemans et al., 2011; Biemans, 2012; | |KeyReference=Rost et al., 2008; Gerten et al., 2004; Biemans et al., 2011; Biemans, 2012; | ||
|Reference=OECD, 2012; Portmann et al., 2010; Fischer et al., 2005;Molden, 2007; FAO, 2011a; OECD, 2012; Sitch et al., 2003; Bondeau et al., 2007; | |Reference=OECD, 2012; Portmann et al., 2010; Fischer et al., 2005;Molden, 2007; FAO, 2011a; OECD, 2012; Sitch et al., 2003; Bondeau et al., 2007; | ||
|InputVar=Land cover, land use - grid; Temperature - grid; Precipitation - grid; Crop irrigation water demand - grid; Irrigation project efficiency; Irrigation conveyance efficiency; Crop irrigation water demand - grid; Water demand other sectors; | |InputVar=Land cover, land use - grid; Temperature - grid; Precipitation - grid; Crop irrigation water demand - grid; Irrigation project efficiency; Irrigation conveyance efficiency; Crop irrigation water demand - grid; Water demand other sectors; | ||
|OutputVar=Water availability - grid; Irrigation water supply - grid; Run off; Water stress - grid; Water withdrawal other sectors - grid; Irrigation water withdrawal - grid; | |OutputVar=Water availability - grid; Irrigation water supply - grid; Run off; Water stress - grid; Water withdrawal other sectors - grid; Irrigation water withdrawal - grid; | ||
|Parameter=Soil properties; Water demand other sectors; | |Parameter=Soil properties; Water demand other sectors; Digital water network - grid; | ||
|Description=Water plays an important role in many natural and human processes. Its availability is essential for natural vegetation and agricultural production, for human settlements and industry. Around one third of the worlds’ population is living in countries already suffering from ‘medium’ to ‘high’ water stress ([[OECD, 2012]]). This number is expected to increase further, due to a growing population that will need more water and is living in a changing climate. | |Description=Water plays an important role in many natural and human processes. Its availability is essential for natural vegetation and agricultural production, for human settlements and industry. Around one third of the worlds’ population is living in countries already suffering from ‘medium’ to ‘high’ water stress ([[OECD, 2012]]). This number is expected to increase further, due to a growing population that will need more water and is living in a changing climate. | ||
Today, agriculture is responsible for 70% of the total global water withdrawals and is thus by far the biggest water user. Around one third of the total global crop production is harvested from irrigated areas, although they only occupy 17% of croplands (e.g. [[Portmann et al., 2010]]). This indicates that irrigation generally supports more productive agricultural practices. | Today, agriculture is responsible for 70% of the total global water withdrawals and is thus by far the biggest water user. Around one third of the total global crop production is harvested from irrigated areas, although they only occupy 17% of croplands (e.g. [[Portmann et al., 2010]]). This indicates that irrigation generally supports more productive agricultural practices. | ||
Revision as of 17:03, 18 February 2014
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Key policy issues
- What is the combined effect of climate change and socio-economic development on water demand and availability, and on associated agricultural production?
- What is the potential of adaptation measures to reduce water stress and water-related crop production losses?
- How can water demand be reduced and still provide the adequate service levels to the sectors with the highest demand?