Fig. 7: Number of months under blue water scarcity by sub-basin.
Maps show the average number of months per year for which each sub-basin experienced blue water scarcity for the period 1980–1984 and 2011–2015 in China (a, b), India (d, e), and the United States (g, h). c, f, i show the change in number of months under blue water scarcity; positive values indicate that the average number of months with blue water scarcity increased between the periods 1980–1984 and 2011–2015. Negative values indicate a decrease in seasonal blue water scarcity. Following Brauman et al. 8, the analysis did not consider sub-basins smaller than 1000 km2 (shown in white).
