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.
5-776: 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
10-409: 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. Because the reservoir provides drinking water, water sports are not allowed. Even motor traffic
15-621: 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. There is a checkpoint (no. 110) in the Harzer Wandernadel hiking network by the reservoir known as Granestausee . List of dams and reservoirs in the Harz In the Harz mountains , there is a higher than average number of dams with their associated reservoirs . The reason
20-535: Is that the Harz is one of the regions with the heaviest rainfall in Germany and so its water power was utilised very early on. The first dam (on the Upper Harz Ponds ) was built to drive water-powered pumps and stamp mills used in the mines . At present, the Harz reservoirs provide hydroelectricity , drinking water and flood protection particularly when the snows melt in spring. The following
25-709: The Oker-Grane Tunnel as well. Likewise there is a 4.6 km long tunnel to the Innerste Dam . The operator of the Grane Dam, as well as its associated diversion systems and waterworks is the Harzwasserwerke . The barrage is an earth dam with asphaltic concrete lining. The Grane Reservoir ( Granestausee ) supplies drinking water , acts as flood protection , water regulation and electricity generation . The hydro-electric power station has
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