Dammträsk

Dammträsk (Swedish for "Pond Swamp") is a small man made lake within the Tyresån Lake System, located in Haninge Municipality, south of central Stockholm, Sweden.

Dammträsk
Coordinates59°10′48″N 18°08′32″E
Primary inflowsÖvre Rudasjön
Primary outflowsDrevviken
Basin countriesSweden
Surface area0.9 ha (2.2 acres)[1]
Surface elevation33 m (108 ft)[1]
SettlementsHaninge
References[1]

The lake receives water from Övre and Nedre Rudasjön south of the lake and empties into Drevviken north of it. Located just south of the residential area Kvarntorp, and north of the densely populated central Haninge, the wetland lake receives considerable amount of nutritive salts.[2]

Environmental impact

The lake and the surrounding wetlands, together with local forests, are regarded as a valuable local natural resource worth to protect.[3] However, while the lake system as a whole is regarded as sensitive to further loads of surface runoff, Dammträsk is one of the lakes in Haninge already to contaminated to be regarded as vulnerable.[4] It has been a conscious decision to redirect water from Rudasjön to Dammträsk, and, as much of the waste the lake receives is sedimented into the lake, Drevviken, the lake downstream is saved from contamination. The price to pay, has been the dense vegetation in the lake. Two abandoned facilities by the lake, a dry cleaner and a gas station, has contaminated the area surrounding the lake. In 2005, the area was restored and some 276 tons of earth containing chlorinated hydrocarbons and 595 tons containing petroleum was removed.[5]

Biodiversity

An inventory of the local vegetation concluded there are 27 species of vascular plants around the lake, which makes it relatively biodiverse (3/5 on a scale where 1 means high biodiversity). One of the interesting species of aquatic plants in the lake is Common Mare's Tail.[1] Grass Carp has been introduced in the lake.[5]

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gollark: It seems like this is being approached from the perspective of "you need to show very well that there's a good reason to make this legal" and not the other way round, because apparently people are just used to "of course things which *might* be bad are banned".
gollark: I don't know. Do you know? Does *anyone* actually have high-quality information on this?
gollark: I think it mostly got lost to the various C4 incidents.
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See also

Notes
  1. Södertörnsekologerna, Vattenväxter
  2. Tyreså Collaboration
  3. Haninge Municipality, Kvarntorp
  4. Haninge Municipality, Dagvattenstrategi
  5. Stockholm County Council, Samarbete

References
  • "Dammträsk" (in Swedish). Tyresån Collaboration. Archived from the original on 2007-08-11. Retrieved 2008-03-08.
  • "Vattenväxter i sjöarna på Södertörn och i angränsande områden" (PDF) (in Swedish). Södertörnsekologerna. pp. 11, and Appendix 7, p 1. Archived from the original (PDF) on 2007-10-07. Retrieved 2008-02-21.
  • "Valuable areas to protect: Kvarntorp" (in Swedish). Haninge Municipality. Archived from the original on 2013-04-18. Retrieved 2008-03-08.
  • "Dagvattenstrategi för Haninge kommun" (PDF) (in Swedish). Haninge Municipality. p. 8. Archived from the original (PDF) on 2010-08-29. Retrieved 2008-03-08.
  • "Samarbete för renare vatten - Tyresån" (PDF) (in Swedish). Stockholm County Council. 2007. p. 32. Retrieved 2008-03-08.
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