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  • The Blue2 project mapped the size and impacts of four environmental pressures and assessed a selection of related measures. One of the pressures considered is water abstraction. For the comparison and appreciation of different model outcomes for the measures considered, a step-wise approach is developed, based on estimations of the value of ESS by willingness-to-pay (WTP)-approaches. Some data are available in literature on the WTP for a step of improvement or deterioration of the ecological status. Apart from the uncertainties and discussions that stick to WTP-approaches, a methodological difficulty that remains to be solved is to connect a step up or down in ecological status to one of the available drought indicators (e.g. WEI+ or Q10).

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