Eutrophication of water reservoirs under anthropogenic, agricultural and industrial impacts

Based on the chlorophyll content and Secchi disc visibility, the Trophic State Index (TSI) values were calculated for chlorophyll α and Secchi disc visibility (Carlson method) and for chlorophyll α alone (Walker method). Additional measurements included the pH, dissolved oxygen, oxygenation and conductivity of the water. As demonstrated by the analyses conducted in the experiment, the annual average chlorophyll α content varied from approximately 2.5 ug/L in oligotrophic reservoirs (such as for example Pogoria III and Kuźnica Warężyńska), up to more than 70 ug/L in retention reservoirs holding strongly eutrophicated water (i.e. Rozlewisko Bytomki and Żabie Doły N). Water transparency ranged from over 5 m in oligotrophic reservoirs (5.1 m in Pogoria III and 5.5 m in Kuźnica Warężyńska), down to less than 0.5 m in hypertrophic reservoirs (Kamieniec – 0.35 m and Rozlewisko Bytomki - 0.45 m ). Based on the calculated TSI indicators and the classifications found in bibliographic sources covering chlorophyll content, the reservoirs covered by the study were classified according to their specific trophic type. There were three reservoirs classified as oligotrophic and eight as mesotrophic water bodies.

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