Virtual Water Trade Network: Understanding the Global Water…

What is Virtual Water?

Virtual water refers to the volume of water used in the production of goods, particularly food. This concept was introduced by Professor Tony Allan to highlight the hidden water content embedded in traded agricultural products such as beef, cotton, coffee, and rice.

The virtual water trade network simulates how these goods move across different regions, carrying their associated water footprints with them.

How Does Virtual Water Affect Regions?

When a region exports agricultural products, it not only sends the physical goods but also transfers the virtual water embedded in those products. This can exacerbate water scarcity issues in regions that are already stressed.

For example, exporting beef from a water-scarce area to another region increases the demand for irrigation and other water-intensive processes in the exporting area, potentially leading to further depletion of local water resources.

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The Blue Water Scarcity Index

The Blue Water Scarcity Index is a measure that indicates the availability of blue water (groundwater and surface water) in relation to human demand. In regions with high virtual water exports, this index can rise due to increased agricultural activities.

Understanding the Blue Water Scarcity Index helps policymakers and stakeholders manage water resources more effectively, ensuring sustainable use and preventing over-extraction.

Real-World Implications

The virtual water trade network highlights the interconnectedness of global water systems. It underscores the importance of considering the hidden water footprints in international trade policies to avoid exacerbating water scarcity issues.

By simulating these flows, we can better understand and mitigate the environmental impacts of our food choices and trade practices.

Frequently asked questions

What is the difference between blue, green, and grey water in this context?

Blue water refers to surface and groundwater used for irrigation. Green water is the water stored as soil moisture that plants use through transpiration. Grey water is the treated wastewater that can be reused.

How does virtual water trade affect global food security?

Virtual water trade can enhance global food security by allowing regions with surplus agricultural products to supply those in deficit, but it also risks increasing water scarcity in exporting areas and potentially leading to local food shortages if export volumes are too high.

Can virtual water trade be beneficial for water-scarce regions?

Yes, virtual water trade can provide economic benefits and help alleviate some of the pressure on local water resources by allowing regions with abundant water to supply those in need. However, it must be managed carefully to avoid over-exploitation.

What are some strategies to manage virtual water trade sustainably?

Strategies include improving irrigation efficiency, promoting sustainable agriculture practices, and implementing policies that encourage the use of virtual water in a way that does not deplete local resources. Water footprint labeling can also help consumers make more informed choices.

Try it live

Everything above runs in your browser — open Virtual Water Trade Network (2D Map) and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Virtual Water Trade Network (2D Map) simulation

Virtual Water Trade Network: Understanding the Global Water Footprint of Agriculture