Intergovernmental Hydrological Programme

This layer shows the percentage of water sourced from watershed(s) outside the watershed within which a given city resides. On average, cities secure 43% of their water supply via intebasin transfers. 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.pdfYou can also visit the Urban Water Blueprint website here: http://water.nature.org/waterblueprint/#/intro=true