Erpeldange village is located on the floodplain of the Sauer and is closely linked. The stream has always formed an integral part of the daily life of Erpeldange's residents, imposing its constraints but at the same offering inhabitants numerous benefits. The Sauer:
• supplied the hayfields with water and nutrients;
• worked the water-mill, thus allowing the production of flour, oil and electricity (from 1921 onwards)
• provided food for the village populations, namely through salmon fishing at the foot of the mill dam.