A Comprehensive Introduction to Water Footprints
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![Page 1: A Comprehensive Introduction to Water Footprints](https://reader030.fdocuments.us/reader030/viewer/2022012922/56813287550346895d9921b0/html5/thumbnails/1.jpg)
A Comprehensive Introductionto Water Footprints
2009 Arjen Y. Hoekstra
Professor in Water Management – University of Twente – the Netherlands
Scientific Director – Water Footprint Network
www.waterfootprint.org
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1. The water footprint of products
2. The water footprint of a nationThe relation between national consumption, trade and water
3. The water footprint of a business
4. From concept to practiceWater footprint impact assessmentReducing water footprints
5. Conclusion
6. The way forward
Overview Presentation
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The water footprintof products
1
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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, blue, grey water footprint.
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Water footprint of a product
Green water footprint
► volume of rainwater evaporated.
Blue water footprint
► volume of surface or groundwater evaporated.
Grey water footprint
► volume of polluted water.
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Direct water footprint Indirect water footprint
Green water footprint Green water footprint
Blue water footprint Blue water footprint
Grey water footprint Grey water footprint
Water
consumption
Water
pollution
[Hoekstra, 2008]
Non-consumptive wateruse (return flow)
Water withdrawal
The traditionalstatistics
on water use
Components of a water footprint
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Assessing the water footprintof crop and animal products
Water footprint of a crop Crop water use (m3/ha) / Crop yield (ton/ha)
Water footprint of an animal Sum of water for feed, drinking and servicing
Water footprint of a crop or livestock product Distribute the water footprint of the root product over its derived
products
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Crop water requirement
1. Calculate reference crop evapotranspiration ET0 (mm/day)e.g. Penman-Monteith equation
2. Calculate crop evapotranspiration Etc (mm/day)Etc = ET0 Kc where Kc = crop coefficient
3. Calculate crop water requirement CWR (m3/ha)CWR = Σ Etc [accumulate over growing period]
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Irrigation requirement
Irrigation requirement = crop water requirement – effective rainfall
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Crop water use
Green water use by crop =
min (crop water requirement, effective precipitation)
Blue water use by crop =
min (irrigation requirement, effective irrigation)
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Grey water footprint
• volume of polluted freshwater that associates with the production of a product in its full supply-chain.
• calculated as the volume of water that is required to dilute pollutants to such an extent that the quality of the water remains above agreed water quality standards.
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HarvestingCotton plant Seed-cotton
Cotton seed
Cotton lint
Cotton seedcake
Cotton seed oil
Grey fabric
Fabric
Final textile
Cotton linters
Cotton, notcarded or combed
Cotton, carded orcombed (yarn)
Hulling/extraction
Garnetted stock
Carding/Spinning
Yarn waste
Knitting/weaving
Wet processing
Finishing
Cotton seed oil,refined
Ginning
18.0
63.0
82.0
35.0
47.0
16.0
33.0
51.0
20.0
10.0
00.1
07.1
00.1
00.1
99.0
95.0
10.0
05.0
00.1
00.1
00.1
00.1
99.0
95.0
10.0
05.0
82.0
35.0
Legend
Value fraction
Product fraction
Production chaincotton
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[Hoekstra & Chapagain, 2008]
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Blue water footprint Million m3/yr
2959Mm3/yr
690 Mm3/yr
421 Mm3/yr
2459 Mm3/yr
803 Mm3/yr
581 Mm3/yr
533 Mm3/yr
450 Mm3/yr
EU25's impact on blue water resources
[Hoekstra & Chapagain, 2008]
Water footprint of EU’s cotton consumption (blue water)
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283 Mm3/yr
485 Mm3/yr
3467 Mm3/yr
165 Mm3/yr
Green water footprint Million m3/yr
186 Mm3/yr
325 Mm3/yr
EU25's impact on green water resources
Water footprint of EU’s cotton consumption (green water)
[Hoekstra & Chapagain, 2008]
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Dilution water footprint Million m3/yr
409 Mm3/yr
310 Mm3/yr
92 Mm3/yr
102 Mm3/yr
635 Mm3/yr
83 Mm3/yr
398 Mm3/yr
697 Mm3/yr
EU25's impact on global water resources due to pollution
Water footprint of EU’s cotton consumption (grey water)
[Hoekstra & Chapagain, 2008]
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The water footprint:making a link between consumption in one place and impacts on water systems elsewhere
Shrinking Aral Sea
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The water footprint:making a link between consumption in one place and impacts on water systems elsewhere
[Photo: WWF]
Endangered Indus River Dolphin
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[Hoekstra & Chapagain, 2008]
This is a global average and aggregate number. Policy decisions should be taken on the basis of:
1. Actual water footprint of certain coffee at the precise production location.
2. Ratio green/blue/grey water footprint.
3. Local impacts of the water footprint based on local vulnerability and scarcity.
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[Hoekstra & Chapagain, 2008]
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[Hoekstra & Chapagain, 2008]
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[Hoekstra & Chapagain, 2008]
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[Hoekstra & Chapagain, 2008]
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[Hoekstra & Chapagain, 2008]
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[Hoekstra & Chapagain, 2008]
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[Hoekstra & Chapagain, 2008]
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Water footprint of biofuels from different crops [litre/litre]
[Gerbens-Leenes, Hoekstra & Van der Meer, 2009]
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The water footprintof a nation
2
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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.
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Water footprint of a nation
► National water footprint =national water use+ virtual water import– virtual water export
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Consumption
Export
Pro
duct
ion
Impo
rt
Internalwater
footprint
External water
footprint
Waterfootprint
Water usefor export
Virtual water import for re-
export
Virtualwaterexport
+
+
=
=
Water usewithin
country
Virtualwaterimport
++
= =
Virtual water
budget
+
+ =
=
National water accounting framework
The traditionalstatistics
on water use
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Arrows show trade flows >10 Gm3/yr
Regional virtual water balances(only agricultural trade)
[Hoekstra & Chapagain, 2008]
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0
500
1000
1500
2000
2500
3000
Chi
na
Indi
a
Japa
n
Pak
ista
n
Indo
nesi
a
Bra
zil
Mex
ico
Rus
sia
Nig
eria
Thai
land
Italy
US
A
Wat
er fo
otpr
int (
m3/c
ap/y
r)
Domestic water consumption Industrial goods Agricultural goods
Water footprint per capita
Global average water footprint
[Hoekstra & Chapagain, 2008]
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1. Consumption characteristics
Consumption volume Consumption pattern
2. Production circumstances
Climate: evaporative demand at place of production Agricultural practice: water use efficiency
Major determinants of a water footprint
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The water footprint of a business
3
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• corporate social responsibility• corporate image / marketing perspective• business risks related to
- freshwater shortage for own operations
- freshwater shortage in supply chain • anticipate regulatory control
Why businesses are interested
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Operational water footprint• the direct water use by the producer – for producing,
manufacturing or for supporting activities.
Supply-chain water footprint• the indirect water use in the producer’s supply chain.
Water footprint of a business
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bluewateruse
greywater
Farmer RetailerFood
processer
Virtualwaterflow
Virtualwaterflow
Virtualwaterflow
greenandbluewateruse
bluewateruse
greywater
greywater
Consumer
bluewateruse
greywater
The virtual water chain
[Hoekstra, 2008]
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The water footprint of a consumer
Indirect WF Direct WF
bluewateruse
greywater
Farmer RetailerFood
processer
Virtualwaterflow
Virtualwaterflow
Virtualwaterflow
greenandbluewateruse
bluewateruse
greywater
greywater
Consumer
bluewateruse
greywater
[Hoekstra, 2008]
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The water footprint of a retailer
bluewateruse
greywater
Farmer RetailerFood
processer
Virtualwaterflow
Virtualwaterflow
Virtualwaterflow
greenandbluewateruse
bluewateruse
greywater
greywater
Supply chain WF Operational WF
Consumer
bluewateruse
greywater
End-use WF of a product
[Hoekstra, 2008]
The traditional statisticson corporate water use
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The water footprint of a food processor
bluewateruse
greywater
Farmer RetailerFood
processer
Virtualwaterflow
Virtualwaterflow
Virtualwaterflow
greenandbluewateruse
bluewateruse
greywater
greywater
Supply chain WF Operational WF
Consumer
bluewateruse
greywater
End-use WF of a product
[Hoekstra, 2008]
The traditional statisticson corporate water use
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[Hoekstra, 2009]
Water footprint
• spatial and temporal dimension
• actual, locally specific values
• always referring to full supply-chain
• focus on reducing own water footprint (water use units are not interchangeable)
Water footprint – Carbon footprint
Carbon footprint
• no spatial / temporal dimension
• global average values
• supply-chain included only in ‘scope 3 carbon accounting’
• many efforts focused on offsetting (carbon emission units are interchangeable)
Water footprint and carbon footprint are complementary tools.
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[Hoekstra, 2009]
Water footprint – Life cycle assessment
Water footprint
• measuring freshwater appropriation
• multi-dimensional (type of water use, location, timing)
• actual water volumes, no weighing
• WF accounts offer basis for impact assessment and formulation of sustainable water use strategy
LCA
• measuring overall environmental impact
• no spatial dimension
• weighing water volumes based on impacts
• LCA offers basis for comparing products with respect to overall environmental impact
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From concept to practice
4
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From water footprint accounting to policy formulation
1
Vulnerability of local water systems
Spatiotemporal-
explicit water
footprint of a• product• individual• community• business
Current water stress in the places where the water footprint is localised
Impacts of the
water footprint• environmental• social• economic
Reduce and
offset the
negative impacts
of the water
footprint
2 3
[Hoekstra, 2008]
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Global map of where
the water footprint
is located
Overlay
Water footprint impact assessment
Global map of where
water systems are
stressed
Global hotspot map
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Impact assessment – hypothetical example
Main producing regions
Producing countries
Global water footprint of a businesslocated in the Netherlands
Water stress(withdrawal-to-availability)
< 0.3
0.3 - 0.4
0.4 - 0.5
0.5 - 0.6
0.6 - 0.7
0.7 - 0.8
0.8 - 0.9
0.9 - 1.0
> 1.0
Environmental water scarcity
Water stress(withdrawal-to-availability)
< 0.3
0.3 - 0.4
0.4 - 0.5
0.5 - 0.6
0.6 - 0.7
0.7 - 0.8
0.8 - 0.9
0.9 - 1.0
> 1.0
Main producing regions
Hotspots
Hotspots
Hotspots are spots where
(1)the business has a substantial water footprint
(2) water is stressed.
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Reduction: all what is ‘reasonably possible’ should have been done to
reduce the existing water footprint; do not undertake water-using
activities if better alternatives are available.
Offsetting: the residual water footprint is offset by making a
‘reasonable investment’ in establishing or supporting projects that
aim at a sustainable, equitable and efficient use of water in the
catchment where the residual water footprint is located.
[Hoekstra, 2008]
Reducing and offsetting the impacts of water footprints
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Reduction of the direct water footprint: water saving toilet, shower-head, etc.
Reduction of the indirect water footprint: substitution of a consumer product that has a large water footprint
by a different type of product that has a smaller water footprint; substitution of a consumer product that has a large water footprint
by the same product that is derived from another source with smaller water footprint.
Ask product transparency from businesses and regulation from governments
Consumer perspective
[Hoekstra, 2008]
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[Hoekstra, 2008]
Reduction of the operational water footprint:
• water saving in own operations.
Reduction of the supply-chain water footprint:
• influencing suppliers;
• changing to other suppliers;
• transform business model in order to incorporate or better control supply chains.
Business perspective
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Water footprint reporting
Shared standards
Labelling of products
Certification of businesses
Benchmarking
Quantitative footprint reduction targets
Business / product transparency
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Government perspective
Reduction of own organizational water footprint: Reducing the water footprint of public services.
Embedding water footprint analysis in legislation
Supporting / forcing businesses: to make annual business water footprint accounts; to implement measures that reduce the impacts of business water
footprints.
Promoting product transparency through promoting a water label for water-intensive products; through water-certification of businesses.
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Shared responsibility and an incremental approach
Consumers or consumer or environmental organizations push businesses and governments to address water use and impacts along supply chains.
Some businesses act voluntarily in an early stage.
Governments promote businesses in an early phase and implement regulations in a later phase.
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The way forward
6
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Mission: Promoting sustainable, equitable and efficient water use through development of shared standards on water footprint accounting and guidelines for the reduction and offsetting of impacts of water footprints.
Network: bringing together expertise from academia, businesses, civil society, governments and international organisations.
www.waterfootprint.org
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Partners
partners from six continents
• research institutions
• governmental institutions
• non-governmental organisations
• large companies from different sectors
• branche organisations
• consultants
• international institutions
www.waterfootprint.org
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