- Too Little
Drought severity presented is based on the length and dryness of the droughts from 1901 to 2008.
Sources: WRI Aqueduct 2014, Sheffield and Wood 2007
- Too Much
Flood occurrence is a count of the number of floods recorded from 1985 to 2011.
Sources: WRI Aqueduct 2014, Brakenridge, Dartmouth Flood Observatory 2011
- Too Dirty
Compromised water quality is represented by total water supply that originates from protected ecosystems.
Sources: WRI Aqueduct 2014; NASA GLDAS-2 2012; IUCN, UNEP 2012