The water quality in a future water supply reservoir has been predicted using mathematical modelling based upon data measurements of water, climate, watershed characteristics, reservoir morphology and hydraulics. The following water quality parameters were modelled: water temperature, dissolved oxygen concentration, algal content, BOD5, phosphate concentration, organic sediment, etc. One and five-year periods were simulated under oligotrophic, mesotrophic and eutrophic water body assumptions to follow the development of water quality. For wet, average and dry weather conditions and most probable mesotrophic productivity development, the water body quality in time was simulated. Based on simulation results, the withdrawal conditions, as amounts and depths, were defined.

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