Grane Dam
| Grane Dam | |
|---|---|
 | |
| Location | Lower Saxony, Germany |
| Construction began | 1966–1969 |
| Dam and spillways | |
| Impounds | Grane |
| Height (foundation) | 67 m |
| Height (thalweg) | 62 m |
| Length | 600 m |
| Elevation at crest | 313.00 m |
| Width (crest) | 8 m |
| Dam volume | 1.8 million m³ |
| Reservoir | |
| Active capacity | 46.39 million m³ |
| Catchment area | 22 km², incl. conduits: 227 km² |
| Surface area | 219 ha |
| Normal elevation | 311.00 m |
The Grane Dam (German: Granetalsperre) is a dam above the village of Astfeld/Herzog-Juliushütte in the borough of Langelsheim in the Lower Saxon part of the Harz mountains.
It is the newest dam in the Harz, built in 1969 in the Grane valley. Because the river Grane itself does not deliver enough water for the 3 km long reservoir, a 7.4 km long diversion channel was built from the Oker river below the Oker Dam. This also collects water from the Gose on the way. A further 4.8 km long diversion runs from the Radau to the Großer Romke and thus into the Oker-Grane Tunnel as well. Likewise there is a 4.6 km long underground tunnel to the Innerste Dam. The operator of the Grane Dam, as well as its associated diversion systems and waterworks is the Harzwasserwerke.
The reservoir supplies drinking water, acts as flood protection, water regulation and electricity generation. The hydro-electric power station has a power output of 180 kW. The waterworks for drinking water lies higher up on the northern slope. The water from the reservoir is pumped up into a compensating storage basin of 60,000 m³ capacity, from where it flows to the waterworks. The Grane Dam has an average annual discharge of 55 million m³.
The barrage is an earth dam with asphaltic concrete lining.
Because the reservoir provides drinking water, water sports are not allowed. Even motor traffic is kept away from it. A track for maintenance was laid around the reservoir, which is also open to walkers and cyclists and is about 17 km long.
See also
Source
- Peter Franke, Wolfgang Frey (1987), Talsperren in der Bundesrepublik Deutschland, Berlin: Systemdruck, ISBN 3-926520-00-0
External links
- Harzwasserwerke.de with link to current dam data
