Valkjärvi (lake)

{{Short description|Lake in the country of Finland}}

{{about|a lake in Nurmijärvi, Finland|a settlement in Leningrad Oblast, Russia|Valkjärvi}}

{{Infobox body of water

| name = Valkjärvi

| image = Valkjärvi, Nurmijärvi.jpg

| caption = View from the Lähtelä Beach.

| image_bathymetry =

| caption_bathymetry =

| location = Nurmijärvi, Uusimaa

| coords = {{coord|60|24|09|N|24|43|12|E|region:FI-18_type:waterbody|display=inline,title}}

| pushpin_map = Finland

| type =

| inflow =

| outflow = Luhtajoki

| catchment =

| basin_countries = Finland

| length =

| width =

| area = {{cvt|1.5|km2}}

| depth =

| max-depth = {{cvt|12.2|m}}

| volume =

| residence_time =

| shore =

| elevation = {{cvt|32.8|m}}

| islands =

| cities = Klaukkala

}}

Valkjärvi is a lake located in the Nurmijärvi municipality in Southern Finland. It is an island-free lake in the immediate vicinity of Klaukkala's urban area. The water flows from the lake along the Luhtajoki River all the way to the Vantaa River.{{cite web |url=http://wwwi2.ymparisto.fi/i2/21/q2104800y/wqfi.html |title=Vesistöennusteet: Vantaanjoen vesistöalue – Luhtaanmäenjoki |publisher=Ympäristö |accessdate=August 31, 2019 |language=fi |archive-date=August 31, 2019 |archive-url=https://web.archive.org/web/20190831141817/http://wwwi2.ymparisto.fi/i2/21/q2104800y/wqfi.html |url-status=live }}

Valkjärvi is the most lushest lake of Nurmijärvi,Jorma Keskitalo: Kasviplanktonlajisto ja –biomassa Uudenmaan seurantajärvillä 2014 – 2015. (in Finnish){{cite web |url=https://www.jarviwiki.fi/wiki/Valkj%C3%A4rvi_(21.054.1.001)?setlang=en |title=Valkjärvi (21.054.1.001) |publisher=Järviwiki |accessdate=August 2, 2019 |language=fi |archive-date=May 27, 2022 |archive-url=https://web.archive.org/web/20220527030107/https://www.jarviwiki.fi/wiki/Valkj%C3%A4rvi_%2821.054.1.001%29?setlang=en |url-status=live }} and it is part of the Nurmijärvi's lake monitoring program of the Central Uusimaa Environment Centre (Keski-Uudenmaan ympäristökeskus) due to its poor oxygen values near the bottom of the lake, which are observed especially in summer and winter under ice.Paula Luodeslampi: Nurmijärven järvien veden laatu 2016-2017. (in Finnish)[https://www.keskiuudenmaanymparistokeskus.fi/sivu.tmpl?sivu_id=5015 Valkjärvi] {{Webarchive|url=https://web.archive.org/web/20220527030107/https://www.keskiuudenmaanymparistokeskus.fi/sivu.tmpl?sivu_id=5015 |date=2022-05-27 }} - Keski-Uudenmaan ympäristökeskus (in Finnish) Blue-green algae are quite common in the lake; in July 2015, the phytoplankton in the lake with the highest total biomass consisted of 40% cyanobacteria and 29% cryptomonad.

Despite all this, Valkjärvi has great recreational value and there are quite a lot of both permanent and holiday settlements around the lake. There are two beaches at the southern end of Valkjärvi: Tiiranranta Beach and Lähtelä Beach.[https://www.nurmijarvi.fi/kuntalaisen-palvelut/kulttuuri-ja-vapaa-aika/liikunta-ja-ulkoilu/liikuntapaikat-ja-tilat/uimarannat-ja-paikat/ Uimarannat ja -paikat] {{Webarchive|url=https://web.archive.org/web/20220419192624/https://www.nurmijarvi.fi/kuntalaisen-palvelut/kulttuuri-ja-vapaa-aika/liikunta-ja-ulkoilu/liikuntapaikat-ja-tilat/uimarannat-ja-paikat/ |date=2022-04-19 }} - Nurmijärvi.fi (in Finnish)