Hornberg Basin

Hornberg Basin
Hornberg Basin - Upper storage reservoir of the Wehr pumped hydropower station
Location	Landkreis Waldshut
Construction began	1970–1975
Dam and spillways
Height (foundation)	65 m
Height (thalweg)	65 m
Length	1715 m
Elevation at crest	1050.00 m
Width (crest)	5 m
Dam volume	2200000 m3
Reservoir
Active capacity	4.4 million m³
Surface area	0.17 km2
Maximum length	0.700 km
Maximum width	0.300 km
Normal elevation	1048.00 m

The Hornberg Basin (German: Hornbergbecken) is the upper reservoir of the Wehr power station, whose lower reservoir is impounded by the Wehra Dam. It lies near Herrischried (Hornberg) and near the town of Wehr in the county of Waldshut in Baden-Württemberg on the dome of the Langer Eck, the highest hill in the Hotzenwald. It was opened in 1975, is only used to generate pumped-storage power and is operated by the Schluchseewerk.

A few hundred metres south of the Hornberg Basin it is planned to build the Hornberg Basin II by 2021 as part of the Atdorf Power Station. With a length of almost one kilometre and storage capacity of 9 million m³ it will be considerably larger than the present Hornberg Basin.