The timeseries on groundwater level available in the WISE SoE water quantity have numerous breaks of one, two or even more years. Hence, the current underlying dataset does not always have sufficient length to assess a long-term phenomenon, such the groundwater level variation. Only 15% of the finally integrated stations in the analysis have more than 10 years of available annual (or reported or aggregated) groundwater level trends. This limits for the moment the expansion of temporal and spatial coverage of the indicator upscaling of the results at national, European and regional levels.
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POLAND
See comments referring to the methodology approach incl. incomparability of the data.
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