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Water Footprint
Water Footprint
1

Water Footprint
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Water Footprint
Contents
1. Introduction
2. Applications of Water Footprints
3. Components of Water Footprints
4. Virtual Water
5. Examples of Water Footprint
6. Are We Sustainable? – Assessing the Water Footprint
7. References
3

Water Footprint
What is a Water Footprint?
Water Footprint is a multi-dimensional indicator showing:
• HOW MUCH (Volume) ...
• WHEN (Time of the year e.g. dry season) ...
• WHERE (Location)...
• TYPE (Freshwater, rainwater, freshwater needed to dilute water
pollution to an acceptable level) ...
... of water is used for the production of a product over the whole
supply chain.
4
1. Introduction

Water Footprint
Adding the indirect water footprints
When you consume the product you do not only consume the direct
water in the product but also the indirect water accumulated for
producing the product!
5
1. Introduction
Water Footprint in each stage of supply chain of
an animal product. Source: HOEKSTRA et al. (2011)

Water Footprint
Why doing a Water Footprint? (1/5)
Water is renewable and a constant total amount of water is cycling
through the environment...
.... So, why do we bother making a Water Footprint?
6
1. Introduction
The water cycle – Total amount of water on earth
is always constant. Source: http://pmm.nasa.gov/education/water-
cycle [Accessed: 22.10.2013]

Water Footprint
For almost all human purposes freshwater is needed ...
7
1. Introduction
Human water uses. Source: MARTIN&CHRISTEY (2012)
Only about 0,01% of
global water
resources is directly
accessible freshwater!
 Only a certain
amount of water
available for all these
uses at one moment!

Water Footprint
Freshwater resources distribution is characterized by:
• Strong regional differences
• Annual and seasonal variation
8
1. Introduction
Freshwater scarcity differs between regions. Source: REKACEWICZ (2009)

Water Footprint
... Due to the dependency and temporary limitation of freshwater a
water footprint can help:
• Identify products that can be risky to produce at a certain location
and certain period of time due to water scarcity
• Achieve a more sustainable and equitable use of freshwater
9
1. Introduction

Water Footprint
10
1. Introduction
The impact of consumption of cotton products (e.g. T-shirts) in EU25 states on the freshwater
resources. About 84% of the water footprint is located outside Europe – mainly in dry regions. Source:
CHAPAGAIN et al. (2006)
Unsustainable and
inequitable: The
water the EU25
(mostly water-rich
countries) cotton
consumption uses
comes mainly from
dry regions!

Water Footprint
Water Footprints can be applied to a:
• Process step
• Product
• Person/consumer
• Community
• Producer/business
• Area
• Nation
• Humanity
11
A process step is always the basis for the
calculations and the process steps are added
up respectively.
E.g. Water Footprint for a person
= sum of the water footprints of the
products that are consumed by a person; a
product water footprint is the sum of the
water footprints of all the process steps that
make up a product.

Water Footprint
Process water footprints as a basis for other footprints
12
Applications of water footprint. Process water footprints are the basic building blocks.
Source: HOEKSTRA et al. (2011)

Water Footprint
The Global Water Footprint Standard (1/3)
Various standards for Water Footprints exist. Probably the most well-
known is the Global Water Footprint Standard.
It accounts for:
• Direct and indirect water use
• Water consumption and water pollution
• Water footprint for freshwater (bluewater), rainwater (greenwater)
and freshwater required to dilute polluted water to an acceptable
quality (greywater)
• Total water footprint is the sum of blue, green and greywater
consumption
13

Water Footprint
No universally valid standard for Water Footprint exists.
Yet, an ISO standard 14046 is currently under development that
provides a norm for Water Footprints and how to integrate them into a
Life Cycle Analysis (LCA).
14
Steps of a life cycle
assessment. Source:
http://www.solidworks.com/sustainability/design/
2722_ENU_HTML.htm [Accessed: 23.20.2013]

Water Footprint
15
Components of a water footprint. The non-consumptive part of water withdrawals (return flow) is
not part of the water footprint. Source: HOEKSTRA et al. (2011)

Water Footprint
Blue water footprint
= Consumption of fresh surface or groundwater.
Taking into account water that:
• Evaporates and transpires
• Is incorporated into the product
• Does not return to the same catchment area (but might return to the
sea or another catchment area)
• Does not return in the same period (might be withdrawn in a dry
period and returned in a wet period)
16
Global blue water footprint of consumption.
Source: http://www.waterfootprint.org/?page=files/WaterStat [Accessed:
22.10.2013]

Water Footprint
Green water footprint
= Consumption of water that refers to precipitation on land that does
not run off or recharge the groundwater but is stored in soil ore
temporarily stays on top of the soil or vegetation.
Taking into account water that:
• Evaporates and transpires from fields and plantations
• Is incorporated into the harvested crop or wood
17
Global green water footprint of consumption.
22.10.2013]

Water Footprint
Grey water footprint
= Consumption of freshwater that is required to assimilate the load of
pollutants based on natural background concentrations and existing
ambient water quality standards.
18
Global grey water footprint of consumption.
22.10.2013]

Water Footprint
Differences between Virtual Water and the Water Footprint
19
4. Virtual Water
Virtual Water Water Footprint
Application Products only Products, Consumer, Producer,
Nation, Humanity, etc.
Dimensions - Volume of
consumed water
- Volume of consumed water
- Type of consumed water (blue,
green, grey)
- Location of water source
- Time of water withdrawal

Water Footprint
Products
20
Product global water footprint and the share of green, blue and greywater.
Source: www.waterfootprint.org [Accessed: 22.10.2013]
Animal products
generally have a
larger water footprint
than crop products.
Primarily, because
animals need more
time to grown and
need to be fed: 98%
of animal’s water
footprint is due to
feed.

Water Footprint
National Water Footprint (1/2)
21
National total water footprint of consumption. Source: MEKONNEN & HOEKSTRA (2011)

Water Footprint
National Water Footprint (2/2)
22
Consumption of agricultural products largely determines the global
water footprint related to consumption (MEKONNEN & HOEKSTRA
2011):
• Agricultural products: 92%
• Industrial products: 4,7%
• Domestic water use: 3,8%
Differences in water footprints vary primarily due to differences in
consumption patterns:
High bovine meat consumption (highly water intensive production)
leads to higher national water footprint.

Water Footprint
National Water Footprint - Importance
23
Traditionally, National Water Plan looks only at water used within a
nation – saving national water by importing water through products
produced in other countries:
Water saved in own country, but neglecting that national
consumption might be unsustainable on a global level
National Water Footprint shows imported water, too:
 Formulating policies that protect the world’s scarce freshwater
sources, too

Water Footprint
Water Footprint Assessment (1/3)
24
Water Footprint by itself does NOT provide information about whether
the activity or product is sustainable or not!
Water Footprint Assessment
assesses whether the water consumption of a
product/person/nation etc. is sustainable.
The Water Footprint Assessment Manual by the Water
Footprint Network. Source: HOESTRA et al. (2011)

Water Footprint
25
Environmental sustainability:
Compare water footprint with availability of water in the
affected water bodies at the location and time of withdrawal.
Water Risk Maps (including filters for season and different water
sources/quality and quantity) are open source available online:
Source: http://aqueduct.wri.org/atlas

Water Footprint
26
Next to environmental impact, also social (basic human needs in the
catchment areas and fairness) and economic (price of water versus its
real economic costs) impact are assessed.
Response strategies can be formulated to directly target activities
that lead to water scarcity and pollution
Improve water source protection and sustainability of water use
Water use should be bearable,
equitable and viable. Source:
http://www.sustainability.umd.edu/content/about/what_is_susta
inability.php [Accessed: 22.10.2013]

Water Footprint
HOEKSTRA, A.Y.; CHAPAGAIN, A.K.; ALDAYA, M.M.; MEKONNEN, M.M. (2011): The Water Footprint
Assessment Manual. Setting the Global Standard. London/Washington: Earthscan. URL:
http://www.waterfootprint.org/?page=files/Publications [Accessed: 22.10.2013]
MARTIN, R. A., CHRISTEY, S.M. (2012): The Software Industry’s “Clean Water Act” Alternative.
Washington: IEEE Computer Society. URL:
http://www.computer.org/csdl/mags/sp/2012/03/msp2012030024-abs.html [Accessed: 22.10.2013]
CHAPAGAIN, A.K., HOEKSTRA, A.Y., SAVENIJE, H.H.G. AND GAUTAM, R. (2006): The water footprint of
cotton consumption. An assessment of the impact of worldwide consumption of cotton products on
the water resources in the cotton producing countries. Ecological Economics Vol. 60, 186-203.
Philadelphia: Elsevier. URL: http://www.waterfootprint.org/?page=files/Cotton [Accessed:
22.10.2013]
MEKONNEN, M.M.; HOEKSTRA, A.Y. (2011): National Water Footprint Accounts. The Green, Blue and
Grey Water Footprint of Production and Consumption. Delft: United Nations Educational, Scientific
and Cultural Organization-Institute for Water Education (UNESCO-IHE). URL:
http://www.waterfootprint.org/?page=files/Publications [Accessed: 22.10.2013]
27
7. References

Water Footprint 28
“Linking up Sustainable Sanitation,
Water Management & Agriculture”
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