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Eutrophication is a persistent damage of surface waters and a widespread environmental problem. It is typically caused by leac hed phosphorus or nitrogen containing compounds into lakes, rivers or other semi-enclosed waters (even slow-moving rivers). The addition of these nutri ents disrupts the ecosystem , leading to new species introduction, decreased biodiversity, and toxicity. The paper deals with an assessment of the surface water quality in the watercourse TopДѕa and the small water basin Hr ДЌeДѕ (Slovak Re...