Post a comment on the text below

The water levels and flows in many of Finland's inland waters are regulated with the help of dams, weirs or other structures connected to hydropower plants. Most of this water level regulation work was done between the 1950s and the 1970s in order to reduce flooding, to produce hydropower, to facilitate water transportation, and to improve the water supply.

Around 220 water level regulation projects have been carried out in Finland, affecting water levels in more than 300 lakes with a combined area of around 10,100 km2 - or about a third of all the country's surface water. There are also 22 artificial reservoirs in Finland, with a total area of 610 km2 (2% of Finland's surface water), while seven bays around the Finnish coast have been dammed to create freshwater reservoirs.

Almost all of Finland's major rivers have been harnessed to generate hydropower, with dams controlling their flow and water levels. There are a total of 250 hydropower plants in Finland, around 60 of which have a capacity of more than 10 MW. About 15 % of Finnish electricity is generated by hydropower.