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29
Drought severity
More than 27
Number of oods
10 to 27
4 to 10
2 to 4
Less than 2
Extremely high
High
Medium to high
Medium
Low
Source:WRIWater Atlas, Aqueduct Global Maps 2.1 Indicators
Source:WRIWater Atlas, Aqueduct Global Maps 2.1 Indicators
Drought severity measures the average length of drought
times the dryness of the droughts from 1901 to 2008. Drought
is de ned as a contiguous period when soil moisture remains
below the 20th percentile. Length is measured in month and
dryness is the average number of percentage points by which
soil moisture drops below the 20th percentile.
Sucre
Sucre
Lima
Quito
Bogota
Caracas
La Paz
Lima
Quito
Bogota
Caracas
La Paz
Flood occurrence
Drought severity
1985-2011
1901-2008
BRAZIL
PERU
BOLIVIA
ECUADOR
COLOMBIA
VENEZUELA
BRAZIL
PERU
BOLIVIA
ECUADOR
COLOMBIA
VENEZUELA