Water exploitation index (WEI) — in late 1980s/early 1990s (WEI‑90) compared to latest years available (1998 to 2007)

Figure Created 24 Feb 2011 Published 24 Feb 2011 Last modified 24 May 2017
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WEI: annual total water abstraction as a percentage of available long-term freshwater resources.

European data


Additional information

The warning threshold, which distinguishes a non-stressed from a water scarce region, is around 20 %, with severe scarcity occurring where the WEI exceeds 40 %.

WEI (water exploitation index) divides the total water abstraction by the long-term annual average resource. However, this indicator does not fully reflect the level of stress upon local water resources: this is primarily because the WEI is based on annual data and cannot, therefore, account for seasonal variations in water availability and abstraction.

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