Characteristics of runoff events in the Upper Váh River catchment in the warm period of year

Hourly discharge data were used to evaluate selected characteristics of summer (June to September) runoff events in the streams of the Upper Váh River catchment in years 2014, 2015, 2017 and 2018.Total summer runoff in individual years was very well correlated with the mean altitude of the subcatchments while the average discharge was similarly well correlated with subcatchments areas.Approximately one half of the events for which the peak discharge in Váh at Liptovský Mikuláš (catchment outlet) exceeded the threshold of 20 m 3 s -1 came mainly from only part of the catchment.The largest events were dominantly contributed by the streams coming from its northern part formed by the Western Tatra Mountains and the westernmost part of the High Tatra Mountains.The average travel time of the peaks in the Váh River between Liptovský Hrádok and Liptovský Mikuláš was longer and the celerities of the waves were smaller than those between the Belá River (the largest tributary of the Upper Váh River) at Liptovský Hrádok and the Váh River at Liptovský Mikuláš.It was not uncommon that the peaks, especially in Belá at Liptovský Hrádok and in Váh at Liptovský Mikuláš occurred simultaneously.The results indicate that heavy rains in the Western and High Tatra Mountains are especially important for the occurrence of the highest flows at catchment outlet.The most extreme discharge increase during the events regularly occurred in the small Dovalovec Creek (catchment area 22 km 2 ).