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Diemelsee, Diemel Reservoir
Diemelstausee, Diemeltalsperre
The Diemel Dam: dam and reservoir, compensating basin (Ausgleichsweiher) and power station. Foreground: the village of Helminghausen. Left: the Eisenberg
Location Waldeck-Frankenberg (HE), Hochsauerlandkreis (NW)
Coordinates 51°22′20″N 8°43′26″E / 51.37222°N 8.72389°E / 51.37222; 8.72389Coordinates: 51°22′20″N 8°43′26″E / 51.37222°N 8.72389°E / 51.37222; 8.72389
Construction began 1912 to 1914 and 1919 to 1923[1]
Dam and spillways
Impounds Diemel, Itter
Height (foundation) 42 m[1]
Height (thalweg) 36.2 m[2]
Length 194 m[1]
Width (crest) 7 m[1]
Width (base) 31 m[2]
Dam volume 72,000 m³[2]
Spillway capacity 113 m³/s
Total capacity 21.75 M m³
Active capacity 19.9 M m³[1]
Catchment area 103 km²
Surface area 1.65 km²[1]
Maximum length 4 km (Diemel arm), 3.1 km (Itter arm)
Maximum width 300 m
Normal elevation 376.2 m above sea level (NHN)
Installed capacity 1.04 MW
Dam and power station from the north

The Diemelsee or Diemel Reservoir (German: Diemelstausee) is a reservoir with a surface area of 1.65 km²[1] and about capacity of 19.9 million m³[1] on the River Diemel in the counties of Waldeck-Frankenberg in North Hesse, and Hochsauerlandkreis, Westphalia, Germany.

It is part of the Diemeltalsperre hydropower system (DiT)[3] comprising the Diemel Dam, the equalizing basin, the power plant and the reservoir itself, owned by the Federal Waterway and Navigation Authority and managed by its Hann. Münden office. The Diemel Reservoir, along with the Edersee is part of the water regulation structure in the catchment area of the River Weser.


The Diemelsee is located a few kilometres northeast of the Upland in the northeastern foothills of the Rothaar Mountains that lie in the northeast of the Rhenish Massif. It lies mainly within the county of Waldeck-Frankenberg, its smaller northern section and its dam belonog to the county of Hochsauerlandkreis. In is also within the Diemelsee Nature Park between Willingen and Marsberg on the territory of Diemelsee and the borough of Marsberg on the River Diemel and its tributary, the Itter. Its dam stands about 500 metres south of the village of Helminghausen (southwest of Marsberg). The only shoreline village is Heringhausen.

The Diemelsee lies in a forested Central Upland countryside, whose highest point in the vicinity of the reservoir is the Köpfchen (ca. 610 m above sea level (NHN); west of the Itterarm in the west). Immediately east-southeast of the dam rises the Eisenberg (594.6 m) and a few kilometres to the south of the dam is the mountain of Koppen (715.1 m).


View of St. Muffert over the Diemelsee

See also[edit]


  1. ^ a b c d e f g h Wasser- und Schifffahrtsamt Hann. Münden: Diemeltalsperre und andere Talsperren, auf wsv.de.
  2. ^ a b c Paul Gerecke: Die Diemeltalsperre, in Zeitschrift für Bauwesen, auf opus.kobv.de (PDF 4,56 MB)
  3. ^ DIN 4048-1 Wasserbau, Begriffe, Stauanlagen, Januar, 1987


  • Peter Franke, Wolfgang Frey: Talsperren in der Bundesrepublik Deutschland. Herausgegeben vom Nationalen Komitee für Grosse Talsperren in der Bundesrepublik Deutschland (DNK) und Deutscher Verband für Wasserwirtschaft und Kulturbau e. V. (DVWK), Systemdruck-GmbH, Berlin, 1987, ISBN 3-926520-00-0.
  • Paul Gerecke: Die Diemeltalsperre. In: Zeitschrift für Bauwesen, 75th annual, 10th–12th issue (Ingenieurbauteil), 1925, pp. 93–104.

External links[edit]