Ecker Reservoir
| Ecker Dam | |
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Dam wall
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 Location of Ecker Dam in Germany
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| Country | Germany |
| Location | Lower Saxony/Saxony-Anhalt |
| Coordinates | 51°50′08″N 10°35′15″E / 51.83556°N 10.58750°ECoordinates: 51°50′08″N 10°35′15″E / 51.83556°N 10.58750°E |
| Construction began | 1939 |
| Opening date | 1942 |
| Dam and spillways | |
| Type of dam | Gravity dam |
| Impounds | Ecker |
| Height | 65 m (213 ft) |
| Length | 235 m (771 ft) |
| Width (crest) | 2.2 m (7 ft) |
| Dam volume | 168,000 m3 (5,900,000 cu ft) |
| Reservoir | |
| Total capacity | 13,270,000 m3 (469,000,000 cu ft) |
| Catchment area | 19 km2 (7 sq mi) |
| Surface area | 68 ha (1 km2) |
| Power station | |
| Operator(s) | Harzwasserwerke |
| Type | Conventional |
| Installed capacity | 2 x 300,000 W (400 hp) |
| Annual generation | 1,400,000 kWh (5,000,000 MJ) |
The Ecker Dam (German: Eckertalsperre) is a gravity dam in the Harz mountain range near Bad Harzburg, Germany. Constructed between 1939 and 1943, it is today operated by the Harzwasserwerke company. The dam's reservoir impounds the waters of the Ecker river and mainly serves for drinking water supply.
The dam is used for the supply of drinking water, flood protection, and raising water levels during times of low rainfall. With an average discharge of 16 million m³ per year, it provides drinking water to the cities of Brunswick, Wolfenbüttel, and Wolfsburg. A pipe system leads to a central water tower near Liebenburg, where the waters of the nearby Grane Dam are also collected.
Electricity generation is also provided through a small hydropower plant, operated by two turbines with an installed capacity of 2 x 300 kW and an annual generation of 1,400,000 kWh.
The Ecker Dam was the third modern reservoir built in the Harz mountains, after the construction of the Söse Dam in 1928–1931 and the Oder Dam in 1930–1933. It was laid out in the Ecker catchment area at the foot of the Brocken massif, characterised by extended upland bogs and heavy precipitation of up to 1,700 mm (67 in) a year. The reservoir uses a section of the river valley which, below a prominent trough end, was dug out in the shape of a basin by an ice age glacier.
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