|Lake name:||Nøklevann||Country:||Norway||GIG Region:||N|
|GIG Type:||LN2a||Lake code:||006-2510-L||Altitude(m a.s.l.):||163|
|Area (km²):||0.79||Mean depth (m):||11.3||Mixing regime:||Stratified|
|Alkalinity (m eq/l):||0.19||Retention time (yr):||N/A||Chlorophyll a (µg/l):||N/A|
|Total phosphorus (µg/l):||5||Eutrophication status:||1 - Low||Hydromorphological status:||1 - Low|
Nøklevatn is situated in a forest area close to Oslo in the south eastern part of Norway, Oslomarka, and is situated 164 m above sea level. The lake has a surface area of 0.8 km2, a mean depth of 11 m, a maximum depth of 34 m and the lake is oligotrophic. The lake has a highly recreational value for the local population, was previously used as drinking water supply and is still one of the reserve drinking water supply lakes of Oslo. The outlet of the lake was also used as water power for the sawmill Rustadsaga. The macrophytes are dominated by Persicaria amphibia, Myriophyllum alterniflorum, Juncus bulbosus, Nuphar lutea and Hippuris. In addition, there are populations of Utricularia, Callitriche hamulata and Isoetes lacustris.
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