Dammträsk

Dammträsk
Coordinates	59°10′48″N 18°08′32″E / 59.18°N 18.14222°E / 59.18; 18.14222Coordinates: 59°10′48″N 18°08′32″E / 59.18°N 18.14222°E / 59.18; 18.14222
Primary inflows	Övre Rudasjön
Primary outflows	Drevviken
Basin countries	Sweden
Surface area	0.009 km²[1]
Surface elevation	33 m[1]
Settlements	Haninge
References	[1]

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.

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]

See also

• Geography of Stockholm

Notes

1. ^ ^{a b c d} Södertörnsekologerna, Vattenväxter
2. ^ Tyreså Collaboration
3. ^ Haninge Municipality, Kvarntorp
4. ^ Haninge Municipality, Dagvattenstrategi
5. ^ ^{a b} Stockholm County Council, Samarbete

References

• "Dammträsk" (in Swedish). Tyresån Collaboration. http://www.tyresan.se/om_tyresans_sjoar/dammtrask/dammtrask.htm. Retrieved 2008-03-08. ^{[dead link]}
• "Vattenväxter i sjöarna på Södertörn och i angränsande områden" (in Swedish). Södertörnsekologerna. pp. 11, and Appendix 7, p 1. http://www.sodertornsekologerna.org/vattenvaxt0330_20031210_text_tab7_tab8.pdf. Retrieved 2008-02-21. 
• "Valuable areas to protect: Kvarntorp" (in Swedish). Haninge Municipality. http://www.haninge.se/Bygga--Bo/Planer-och-ny-bebyggelse/Utvecklingsprogram/Vega---Norrby-utvecklingsprogram/Kvarntorp---centrala-Vega/Naturvarden/. Retrieved 2008-03-08. ^{[dead link]}
• "Dagvattenstrategi för Haninge kommun" (in Swedish). Haninge Municipality. pp. 8. http://www.haninge.se/upload/3633/dvstrategi.pdf. Retrieved 2008-03-08. 
• "Samarbete för renare vatten - Tyresån" (in Swedish). Stockholm County Council. 2007. pp. 32. http://www.ab.lst.se/upload/dokument/publikationer/M/Rapportserien/2007/R2007_24_Samarbete_for_renare_vatten_Tyresan.pdf. Retrieved 2008-03-08.