Teorie mo nosti v hydrologii a vodním hospodá ství

This study introduces the possibility theory, the foundations of which were laid by Zadeh (1978), using the fuzzy sets theory, and it clarifies its basic concepts and principles. The study was aimed to verify methodological procedures of the possibility theory in current water management tasks. The case study examined possibilities of simultaneous occurrence of several causal factors of hydrological situations, and their impacts on water sources in changed climatic conditions. The second task was focused on the assessment of effects of climatic change on the storage function of the ance reservoir in the Odra River catchment. In the end, problems open up for further research are outlined.