Number of sources from which cities harvest water

This layer presents the number of water sources (surface and non-surface) from which cities around the world harvest water. On average, cities retrieve water from 4 different sources. Note that if a city gets a small fraction of its water from surface water, there will be calculated values for this metric, but it is not particularly meaningful for a city's water risk or opportunity profile. For more information, access the Urban Water Blueprint report here: http://www.iwa-network.org/wp-content/uploads/2016/06/Urban-Water-Blueprint-Report.pdf You can also visit the Urban Water Blueprint website here: http://water.nature.org/waterblueprint/#/intro=true Drinking water Supply