Water rising naturally from the earth.

Drillings and wells to exploit groundwater, as well as exploration wells.

Layer showing the floodplain of the Alzette river during the 1995 flood event (Data based on aerial photographs)

Layer showing the floodplain of the Alzette and lower Sûre river during the 1993 flood event (Data based on photographs taken out of an airplaine, topographic map 1/10.000 and field surveys)