Maridalsvannet
Encyclopedia
Maridalsvannet is a lake in Maridalen
Maridalen
Maridalen is a valley situated just north of Oslo, Norway, just above the suburb of Kjelsås. Most of the valley is made up of a lake known as Maridalsvannet, that serves as the primary source of drinking water for 90% of Oslo's population. The valley is a popular recreational area with many hiking...

, Oslo
Oslo
Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...

, Norway. It is the largest lake in the municipitality of Oslo, and serves as the main drinking water supply for the city. The lake drains via the river Akerselva
Akerselva
Akerselva, or Akerselven, is a river which flows through Oslo. It starts at Maridalsvannet in Oslomarka, and follows the urban areas Nordre Aker, Sagene, Grünerløkka, Oslo centre and Grønland, whereby it finally ends at Paulsenkaien and Oset in Bjørvika. The river is considered to be a part of the...

 to the Oslofjord
Oslofjord
The Oslofjord is a bay in the south-east of Norway, stretching from an imaginary line between the Torbjørnskjær and Færder lighthouses and down to Langesund in the south to Oslo in the north....

. The primary inflows
Inflow (hydrology)
In hydrology, the inflow of a body of water is the source of the water in the body of water. It can also refer to the average volume of incoming water in unit time. It is contrasted with outflow....

 are Skjærsjøelva and Dausjøelva. The Hammeren Hydroelectric Power Station
Hammeren Hydroelectric Power Station
Hammeren Hydroelectric Power Station is a hydroelectric power station located in Oslo, Norway. It is the only power station in Oslo, and among the oldest power stations still running in Norway. It has a total installed capacity of 5 MW, and an annual prodcution of 16 GWh. The powerstation utilises...

 exploits the fall from Skjærsjøen
Skjærsjøen
Skjærsjøen is a regulated lake in Nordmarka, Oslo, Norway. It drains through the river Skjærsjøelva to Maridalsvannet, and also via tubes to the Hammeren Hydroelectric Power Station. It is regulated by the dam Skjærsjødammen from 1890.-References:...

to Maridalsvannet.
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