The map provides an overview of the current groundwater levels and spring discharges in Switzerland. The trend indicates whether the groundwater level or spring discharge at a particular gauging station has been rising, stable or falling over the previous seven days. The calculation is based on percentiles of the dataset for the standard period 1991–2020 or, in the case of a shorter data series, the standard period 2001–2020 (basic data in m amsl and l/min or m³/s).

• A figure significantly lower than the average conditions (low groundwater level or spring discharge) is reached if the current value measured is below the long-term 10th percentile, i.e. it is among the lowest 10% of all the data measured for the relevant month during the standard period.
• A groundwater level or spring discharge between the 10th and 90th percentiles means that conditions are normal.
• However, a figure significantly higher than the long-term average conditions (high groundwater level or spring discharge) is reached if the current value is above the 90th percentile.

Further information (historical data, statistics, etc.) is available by clicking on the stations.

NAQUA, QUANT module: Groundwater quantity (groundwater levels and spring discharges) – Background information on the FOEN monitoring network