Estimating the level of water eutrophication in poraj dam reservoir based on selected methods

In this publication the chosen methods of estimation of the eutrophication were presented. These methods were used for the evaluation of the trophic status of the Poraj Reservoir water. In this research the Integral trophic state index was used. In addition the loading reservoir with total phosphorus was estimated, as well as the permissible and the critical loads of phosphorus according to Vollenweider were also defined. Furthermore, the trophic classification of reservoir water was achieved on the grounds of: the concentrations of biogenic substances in reservoir water, the concentrations of the chlorophyll a, the biomass of phytoplankton and the species composition of phytoplankton. The every chosen methods indicated on the advanced eutrophication processes occurring in this reservoir.