15 hydrological cycle 25 hydrological drought 2 hydrological drought 2018 8 hydrological extremes 1 hydrological extremes - runoff formation - retention potential - Otava River - automatic stations - experimental catchment - peat bogs hydrological function - oxygen isotopes - snow cover - retention and accumulation spaces - climate change 3 Hydrological forecasting 4 hydrological function 2 hydrological losses 6 hydrological model 2 hydrological modeling