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No sufficient data are available at the European scale on ‘return’. To fill gap in data on return, urban waste water treatment plant data, the European Pollutant Release and Transfer Register (E-PRTR) database, Eurostat population data, JRC data on the crop coefficient of water consumption and satellite-observed phenology data have been used as proxies to quantify the water demand and water use by different economic sectors. Eurostat tourism data (Eurostat, 2020a) and data on industry in production have been used to estimate the actual water abstraction and return on a monthly scale. Where available, Waterbase — Water Quantity database (EEA, 2021) and Eurostat data (Eurostat, 2020c) on water availability and water use have also been used at aggregated scales for further validation purposes.

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gomesfer (Fernanda Gomes) 26 Aug 2022 19:51:20

The methodology used for calculating the returns is not well explained. The values of the returns cannot simply be estimated on the basis of WWTP discharges but also on the basis of their location. Keep in mind that many of the sewage treatment plants in large cities located on the coast discharge into the sea and therefore do not account for their return to inland waters. And this calculation at monthly level seems even more difficult.
- zalllnih (Nihat Zal) 15 Sep 2022 11:59:20
  
  The data on UWWTP is used in identifying potential locations of the water discharge from the UWWTPs back to the surface water and sea water. As you also know that the UWWTP data is not providing the information on the volume of discharge water, but rather the capacity of the water treatment of UWWTPs on population equivalent. We use constant coefficient to estimate the water returns per sector. The set of coefficients used in estimating the water returns per economic sector for each country has been provided in the excel file “Reference data on water abstraction and returns” under the current Eionet consultation;
  
  https://forum.eionet.europa.eu/nrc-eionet-freshwater/library/indicator-water-exploitation-index/reference-data-water-abstraction-and-returns/download/en/1/Reference%20annual%20data_country%20level_2000-2019.xlsx
  
  The methodology used for calculating the returns is not well explained. The values of the returns cannot simply be estimated on the basis of WWTP discharges but also on the basis of their location. Keep in mind that many of the sewage treatment plants in large cities located on the coast discharge into the sea and therefore do not account for their return to inland waters. And this calculation at monthly level seems even more difficult.

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