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Regarding WEI+ thresholds, it is important that agreement is reached on how to delineate non-stressed and stressed areas. Raskin et al. (1997) suggested that a WEI value of more than 20 % should be used to indicate water scarcity, whereas a value of more than 40 % would indicate severe water scarcity. These thresholds are commonly used in scientific studies (Alcamo et al., 2000). Smakhtin et al. (2004) suggested that a 60 % reduction in annual total run-off would cause environmental water stress. The FAO uses a water abstraction value of above 25 % to indicate water stress and of above 75 % to indicate serious water scarcity (FAO, 2017). Since no formally agreed thresholds are available for assessing water stress conditions across Europe, in the current assessment, the 20 % WEI+ threshold proposed by Raskin at al. (1997) is considered to distinguish stressed from non-stressed areas, while a value of 40 % is used as the highest threshold for mapping purposes.
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last sentence: ....threshold proposed by Raskin at al. (1997) originally for WEI is considered....
Thank you for your comment, well-noted. We will make proper adjustments in the text
Are the thresholds presented by Raskin et al., 1997 within the scope of the WEI indicator also applicable, without adaptation, to the WEI+ indicator?
Thank you for your comment. We are aware of the issue. As there is no agreed trehsolds values available for the EU assessment, we indicatively keep the same threshold values, until any new are proposed.
As no formally agreed thresholds are available for WEI+, we agree with previous comments about applicability of WEI tresholds.
We wonder if there is any ongoing work on specific WEI+ thresholds
Thank you for your comment. We are aware of the issue. As there is no agreed trehsolds values available for the EU assessment, we indicatively keep the same threshold values, until any new are proposed.
Italy:
we agree with previous comments about the applicability of WEI thresholds to the WEI+ evaluations
Thank you for your comment. We are aware of the issue. We assume that having an agreed set of WEI+ thresholds could be achieved by wider consultation between the Commission and the MSs with the contributions from the Scientific community.