Groundwater role in the analysis of the water footprint Maite M. Aldaya M. Ramón Llamas University...
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Transcript of Groundwater role in the analysis of the water footprint Maite M. Aldaya M. Ramón Llamas University...
Groundwater role in the analysis of the water footprint
Maite M. AldayaM. Ramón Llamas
University of Twente – the NetherlandsWater Observatory – M. Botin Foundation
The role of the groundwater silent revolution:‘more cash and nature per drop’
IUCN and M. Botin Foundation: Side event5th World Water Forum, Istanbul, 20 March 2009
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.
► type of water use:
Green water footprint - volume of rainwater evaporated.
Blue water footprint - volume of surface or groundwater evaporated.
Grey water footprint - volume of polluted water.
Water footprint of a nation
► total amount of water that is used to produce the goods and services consumed by the inhabitants of the nation.
► two components:• internal water footprint – inside the country.• external water footprint – in other countries.
Export
Consumption
Impo
rt
Pro
duct
ion
Virtual water import for re-
export
Water use for export
Virtual water export
External water
footprint
Internal water
footprint
Water footprint
+
+
=
=
Virtualwaterimport
Water use within
country
++
= =
Virtual water
budget
+
+ =
=
National water accounting framework
The traditional statisticson water use
Water footprint with distinction of green and blue water (surface and groundwater) and related economic analysis for the Guadiana basin
Source: CHG (2008)
Guadiana WF
Agricultural use of water resources in the Guadiana (Mm3/year) (2001)
0 50 100 150 20025 Km
PROVINCES
LOWER GUADIANA
FORMER LOWER GUADIANA II OR TOP DOMAIN
UPPER GUADIANA
MIDDLE GUADIANA
GREEN WATER
BLUE SURFACE WATER
BLUE GROUNDWATER
Source: Aldaya and Llamas (2009)
BADAJOZ
CÁCERES
CUENCATOLEDO
SEVILLA
ALBACETE
CÓRDOBAHUELVA
CIUDAD REAL UPPER GUADIANA
MIDDLE GUADIANA
LOWER GUADIANA
1286
93
835
905745
142
7443
34
21103
TOP DOMAIN
Guadiana WF: Water consumption
Water economic productivity
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Upper Guadiana Middle Guadiana TOP Lower Guadiana
Humid (1997)
Average (2001)
Dry (2005)
€/m
3
Water economic productivity
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Upper Guadiana Middle Guadiana TOPTOP Lower GuadianaLower Guadiana
Humid (1997)
Average (2001)
Dry (2005)
€/m
3
Total blue water economic productivity (€/m3) concerning agricultural sector per year
Guadiana WF: Water consumption
Legal restrictions in GW use
One of the most regulated basins
Groundwater role within the water footprint
► Cash crops are usually obtained with groundwater irrigation
► Green water and most surface water irrigation systems cannot guarantee supply due to climate variability
► Relevant role of groundwater to achieve ‘more cash and nature per drop’
Thank you