Cottbuser Ostsee

Artificial lake in Germany

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The Cottbuser Ostsee (Cottbus Eastern Lake; Lower Sorbian: Chóśebuski pódzajtšny jazor) is an artificial lake under development on the grounds of the former open-pit lignite mine de:Tagebau Cottbus Nord near Cottbus, Brandenburg, Germany.

51°47′10″N 14°25′01″E / 51.786°N 14.417°E / 51.786; 14.417Typeflooded former open pit lignite minePart ofLusatian Lake DistrictPrimary inflowsHammergraben (Spree)BuiltDecember 23, 2015 (2015-12-23) end of mining April 12, 2019 (2019-04-12) start of floodingFirst floodedApril 12, 2019 (2019-04-12) begin of flooding December 31, 2030 (2030-12-31) end of flooding (planned)Surface area1,900 hectares (4,700 acres) (planned)Average depth2.5 to 3 metres (8 ft 2 in to 9 ft 10 in) (planned)Max. depth30 metres (98 ft) (planned)Water volume150,000,000 cubic metres (5.3×10⁹ cu ft) (planned)Surface elevation61.8 metres (203 ft) above Normalhöhennull (planned)

Dimensions

When complete, it is to cover a surface area of 19 km² (7.3 sq mi), making it one of the biggest artificial lakes in the country.^[1] At a maximum depth of 30 metres (100 ft) and an average depth of between 2.5 metres (8 ft 2 in) and 3 metres (10 ft) the lake is to have a total water volume of 0.150 cubic kilometres (0.036 cu mi) once flooding is complete. Until the lake is complete, the biggest artificial lake in Germany by surface area (likewise created by conversion of a former lignite mine) is Geiseltalsee which covers some 1,840 hectares (4,500 acres). However, the water volume of Geiseltalsee is almost three times larger at 0.423 cubic kilometres (0.101 cu mi). For comparison, Germany's largest lake, Lake Constance, covers 536 square kilometres (207 sq mi) at a depth of up to 251 metres (823 ft) and contains some 48 cubic kilometres (12 cu mi) of water. The largest reservoir (i.e. an artificial lake created via a dam) in Germany by surface area is Forggensee in Bavaria with a surface area of 15.2 square kilometres (5.9 sq mi) and a maximum water volume of 0.168 cubic kilometres (0.040 cu mi). However, this lake is reduced to a "rump" of 3.2 square kilometres (1.2 sq mi) surface area in winter.

History

The lake covers what used to be the open pit lignite mine "Tagebau Cotbus Nord" which produced a total of 220 megatonnes (220,000,000 long tons; 240,000,000 short tons) of coal during its operation from 1981 to 2015. The last coal was mined in December 2015 and subsequently work began on converting the mine into a lake. Flooding started in 2019^[2]^[3] but had to be interrupted several times due to low water levels in the nearby Spree River.^[4]^[5] The lake is to become part of the Lusatian Lake District, a chain of artificial lakes mostly the result of open-pit lignite mining.

Name

The name - besides referring to the location of the lake to the East of central Cottbus - can be interpreted as a pun on the German name for the Baltic Sea, which is called "Ostsee" in German, the two words only being distinguished by their grammatical gender: "See" meaning "sea" in German is grammatically feminine, whereas "See" meaning "lake" in German is grammatically masculine.

References

^ "Cottbuser Ostsee | Wie ein neuer See entsteht". www.leag.de.
^ "Geburtsstunde für größten See Brandenburgs: Tagebau geflutet". April 12, 2019 – via www.welt.de.
^ "» OSTSEE-FLUTUNG IST STARTSCHUSS FÜR COTTBUSER PERSPEKTIVEN".
^ "Dem Cottbuser Ostsee geht das Wasser aus - bevor es da ist". www.rbb24.de. Archived from the original on 2020-12-26. Retrieved 2020-11-20.
^ "Umweltminister stuft Lage in Gewässern als "super-ernst" ein". www.rbb24.de. Archived from the original on 2020-12-04. Retrieved 2020-11-20.