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WW-I-2a: Groundwater level and spring flow – Northern Region
… level and spring flow – Northern Region’ indicates – for the years of 1961 to 2021 – the annual number of months in which the highest mean groundwater level was … onwards, there has been an extended aggregate of gauging stations available. By 2021, the number of months indicating non-attainment of the relevant reference value … level and spring flow – Northern Region’ indicates – for the years of 1961 to 2021 – the annual number of months in which the highest mean groundwater level was …