Forsån

Forsån

Infobox River
river_name = ForsånVattenprogram, p 30.1]


image_size =
caption =
origin = Magelungen
mouth = Drevviken
basin_countries = Sweden
length = 1,4 km
elevation = Δ 0,7 m
mouth_elevation =
discharge =
watershed = 80 ha

Forsån (Swedish: "Rapids' Stream") is a stream in southern Stockholm, Sweden. It is also known as Stortorpsån and Forsen.

Leaving lake Magelungen calmly by a small sandy beach, Forsån's upper reach passes through a furrow blown in the 1860s to lower the level of the lake resulting in the present wide torrents passing through the bedrock. In contrast, the last 500 metres of the course are characterized by flat shores and stagnant, overgrown waters. The stream has a vigorous population of Signal crayfish and is the only winter habitat in Stockholm for White-throated Dipper.Forsån]

Catchment area

Approximately half of the catchment area is occupied by contaminated ground and polluting operations in the Larsboda industrial area; with the remaining area composed of parks and green spaces. One minor allotment-garden is located in the area which is also crosses by two major traffic routes and one railway.Vattenprogram, p 30.2]

Environmental influence

The inflow from Magelungen brings approximately 2 tons of phosphorus and 30 tons of nitrogen to Forsån, the contribution from the catchment area itself, 10 kg and 40 kg respectively, insignificant in comparison. No estimates of levels of metals brought to the stream has been done, but low or moderate levels of common metals were reported in river sediments in 1997, except for very high levels of lead next to the road Magelungsvägen.

Fauna

Samples of bottom fauna taken in 1998 documented the presence of nationally rare species of gastropods such as "Hippeutis complanatus" and bivalve Swan mussel; and during the preceding decades two species of limnetic gastropods were documented. Larvae of White-legged Damselfly and Blue-tailed Damselfly were recorded in summer 2000. Signal crayfish and Trout have been introduced in the stream, of which the former succeeded in establishing while Roach is believed to be unfavourable to the latter. The white water in makes a section of the stream ice-free during winters which attracts White-throated Dipper and Common Kingfisher. In 1996, traces of Beaver were reported.Vattenprogram, p 30.3]

See also

* Geography of Stockholm
* Rivers of Sweden

Notes

References

* cite web
url = http://www.stockholmvatten.se/Stockholmvatten/Vattnets-vag/Sjovard/Sjoar-och-vattendrag/Forsan/
title = Forsån
publisher = Stockholm vatten
date = 2007-03-01
accessdate = 2007-06-05
language = Swedish

* cite web
url = http://www.stockholmvatten.se/Stockholmvatten/commondata/infomaterial/Sjo/30Forsan.pdf
title = Vattenprogram för Stockholm 2000 - Forsån
publisher = Stockholm vatten
accessdate = 2007-06-05
language = Swedish
format=PDF


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Forsan — Forsan, TX U.S. city in Texas Population (2000): 226 Housing Units (2000): 96 Land area (2000): 0.290179 sq. miles (0.751559 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.290179 sq. miles (0.751559 sq. km)… …   StarDict's U.S. Gazetteer Places

  • Forsan, TX — U.S. city in Texas Population (2000): 226 Housing Units (2000): 96 Land area (2000): 0.290179 sq. miles (0.751559 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.290179 sq. miles (0.751559 sq. km) FIPS code:… …   StarDict's U.S. Gazetteer Places

  • Forsan Independent School District — is a public school district based in Forsan, Texas (USA).In addition to Forsan, the district serves the community of Elbow and rural areas in southeastern Howard County. The district also includes small portion of southwestern Mitchell… …   Wikipedia

  • Forsan, Texas — Infobox Settlement official name = Forsan, Texas settlement type = City nickname = motto = imagesize = image caption = image mapsize = 250px map caption = Location of Forsan, Texas mapsize1 = 250px map caption1 = subdivision type = Country… …   Wikipedia

  • Forsan et hаеc olim meminisse iuvabit — ( может быть, и это когда нибудь будет приятно вспомнить ) сделавшийся пословицей стих Вергилия ( Энеида , I, 203). представляющий собой незначительно измененный перевод одного места из Одиссеи Гомера (XII, 208 и сл.). Часто эту пословицу… …   Энциклопедический словарь Ф.А. Брокгауза и И.А. Ефрона

  • Forsan et haec olim meminisse iuvabit — ( может быть, и это когда нибудь будет приятно вспомнить ) сделавшийся пословицей стих Вергилия (Энеида I, 203). представляющий собой незначительно измененный перевод одного места из Одиссеи Гомера (XII, 208 и след.). Часто эту пословицу… …   Энциклопедический словарь Ф.А. Брокгауза и И.А. Ефрона

  • forsan et haec olim meminisse juvabit — foreign term Etymology: Latin perhaps this too will be a pleasure to look back on one day …   New Collegiate Dictionary

  • Mercure Ismailia Forsan Island — (Исмаилия,Египет) Категория отеля: 4 звездочный отель Адрес: Forsan I …   Каталог отелей

  • Líster Forsán — Líster Forsán, Enrique …   Enciclopedia Universal

  • Líster Forsán, Enrique — ► (1907 94) Político y militar español. Ingresó en el Partido Comunista y durante la Guerra Civil española defendió Madrid. Estuvo exiliado en la U.R.S.S. hasta 1977 …   Enciclopedia Universal

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”