The “Nadelwehr” in Hann. Münden, Germany is a traditional barrage used to higher the level of the river Werra. It consists of wooden needles put into the river close to the watergate and the old Werra bridge. In the past this technique was used to raise the water level for ships or to use the energy of the water for mills.

Today the barrage is only there for touristic reasons – being located close to the city center and tourist paths. Another positive effect is that the barrage raises the amount of oxygen within the water. The barrage is set up manually every year by employees of the city.

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