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2.1 Indicator definition

The Groundwater Level Trend (GLT) indicator measures the average change of the annual groundwater level over the monitoring period. The result is expressed in metres per year (m/y). Positive values (higher than zero) indicate an increase of the groundwater level, whereas negative values (lower than zero) indicate a decrease of the groundwater level. GLT is based on the methods of multi-year groundwater level trend analysis (e.g. Nguyen et al., 2021; Le Duy et al., 2021) and the Groundwater Table Declining Trend indicator (Hofste et al., 2019; Galvis Rodríguez et al., 2017).