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In 2012, the Roadmap to a Resource Efficient Europe (EC, 2011a) set out as a key goal that the volume of water abstraction should decrease below the threshold of 20% of renewable freshwater resources. The threshold of 20 % is commonly proposed in literature (Raskin and Gleick, 1997) and commonly applied in relevant studies to distinguish sustainable from unsustainable levels of water abstraction, use or consumption⁽[4]⁾. Currently, the above objective is not attained in many river basins, especially in southern Europe, and relevant water stress issues are foreseen to amplify in the future. Furthermore, under the UN SDG 6.4.2, FAO has set a similar threshold of 25 % for defining unsustainable management.