Table 2.

Water scarcity indicator accounting methods in Simapro 9.3.

Method	Approach	Description of the method’s key features
[86]	Midpoint (Water scarcity) Endpoint (Human health)	- This WSI-accounting method provides a consumption to availability (CTA) ratio; - It was modelled, using a logistic function, so that the resulting indicator values fall within the 0–1 m3 deprived/m3 consumed. - The scarcity indicators considered by this method are available for surface and groundwater. - Data on water consumption and availability were extrapolated by using the Water Gap model. - The indicator only refers to the volume of consumed water, and assesses the consumptive water use.
[82]	Midpoint (Water scarcity)	- This method is based upon the assessment of the vulnerability of basins to freshwater depletion, and measures the water depletion index (WDI) based on local blue water scarcity. - The WDI denotes the risk that the water consumption can lead to depletion of freshwater resources. - For water scarcity determination, annual water consumption is related to availability in more than eleven thousand basins. - The WDI takes into account, lakes and aquifers which had been neglected in previous water scarcity assessments. - In addition to water scarcity, absolute freshwater shortage is accounted for by setting the WDI to the highest value in (semi)arid basins. This was used in the method to avoid mathematical artefacts of previous indicators being zero in deserts if the consumption is zero.
[8]	Midpoint (Water scarcity)	- This WSI is based upon a consumption-to-availability ratio. - That ratio is expressed as the fraction between consumed and the available water. - As for [86]; the indicator only applies for the consumed water volume and only assesses consumptive water use.