EN
The global warming is important factor influencing changes in water circulation. Global Circulation Models (GCMs) developed in the last decades have enabled assessment of global warming effect. The goal of this study is to apply the mathematical rainfall - runoff model to evaluate the rate and direction of changes in flood formation resulting from climate changes using historical data and generated by ECHAM4 GCM in 5 selected basins in Poland. The study confirm that main factors controlling flood formation in present are precipitation intensity, topography and land cover. According to modeling results in the perspective of 80 - 90 years only the floods in Carpathian region will exceed those observed in the past years. In the Polish Lowlands maximum precipitation totals of p= 1% will be from 20 to even 50% lower than in the last decades, thus river runoff will decrease.