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Why is Lake Ohrid so clean?

2022-11-21 20:17:29Lifestyle SHKRUAR NGA REDAKSIA VOX
Why is Lake Ohrid so clean?
Lake Ohrid

The water clarity of this lake reaches up to 21m, and the euphotic zone of the lake – which receives enough light for photosynthesis – extends up to 150m, due to its exceptional purity. While the water is always crystal clear, the winter months offer greater clarity. Different species have been able to evolve and adapt to underwater spaces that would not be able to survive in lakes filled with little light.

But why is Lake Ohrid so clean?

One of the reasons that makes Lake Ohrid different from many other lakes is the many canals that supply it inland. Unlike many inland waters, this lake receives very little water from sediment rivers – it used to be less than 10% before the Sateska River was diverted in the 1960s.

The largest sources supplying Ohrid are individual (approximately 50%). So there are rare underground channels that pass through the karst mountain of Galicica on the eastern shore of the lake. These underground channels bring water from rainfall, but some also originate from Lake Prespa, leaving some of the water's nutrients (about 65% phosphorus) along the way. This procedure helps to prevent a process known as eutrophication, which can promote algae growth and cause water clarity to decrease. At the same time, passing through the paths of underground rocks, water does not accumulate dirt, while in other cases of underground channels it happens. It's a fine balancing act.

If all the nutrients were reduced, the rich underwater world of Lake Ohrid, especially from the springs - where there are often micro-metropolises for unique species - would not be possible. The water source system has another 'as up its sleeve' as well. When you get into the lake, the spring waters are cold, so they tend to sink deep in the summertime, which takes these limited nutrients away from the surface level, where light-blocking processes would set up. This is in contrast to water that comes from rivers that often flow at a higher level. In addition to the karst channels that bring high-quality water through the Galicica mountain to be incorporated into the sources of Lake Ohrid, the natural water purification infrastructure includes the 'Studenchishte Marsh', a wetland area in Macedonia, which acts as an additional buffer to prevent invasive feeders from entering the lake. The result is optimal clarity that contributes to the development of vibrant underwater life and the beauty of Lake Ohrid.

Source: Ohrid SOS


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