Mountain Biking Highlight
The Obernaustausee, whose water surface is 86 ha (0.86 km²) at the highest storage target (369.7 m above sea level), has around 14.8 million m³ of storage space and a catchment area of around 11.3 km². In addition, a bypass tunnel, which was built from 1982 to 1984, connects a catchment area of 10.2 km²; it directs water from the upper Sieg, the Michelbach and the Sindernbach through the Nauholzbach into the dam. It has flood relief with three fish belly flaps, a 70 m high extraction tower at the water-side dam foot with six different extraction heights, a hearth wall with a control passage over the entire length of the water-side dam foot and a bottom drainage channel. The dam has two berms on the green air side.
The Obernautalsperre, which is 46 m high above the valley floor (dam crest: 373.5 m above sea level) as well as 300 m crest length and 10 m crest width, has a dam volume of 1,000,000 m³.
September 14, 2018
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