Upon each sponge county, an amount of water proportional to its increase in urban domestic water consumption by 2030 was poured. The expansion of the sponge means that the height of the country now represents its future need for urban domestic water.

Over the next 20 years a combination of urbanisation and population growth will lead to a huge increase in domestic water needs in cities. While this will have little impact on some countries, others will need to develop large new infrastructures. Some countries will be able to afford this more easily than others.

Watch the video of how it was made:

Urban water needs: Can we keep up? from hal watts on Vimeo.