Runoff regimes are good indicators of climate changes. The graduation thesis discusses the definition of runoff regime types for selected rivers in the period from 1971 – 2000. The method of "discriminant periods" is used, as it was in the study of the Danube catchment. Regarding to the chosen method, 7 regime types were determinated in Slovenia. Regarding to this determination the stability, as it was proposed by Nováky (2001), was computed for all the used water gauging stations. The results had shown that maximum hydrological events have more influence on the stability of a certain regime, then the minimum hydrological events. In the second part the up mentioned method was compared with the method for hierarchical clustering, with which the last grouping of Slovenian rivers in to discharge regimes was made, using the period from 1961 to 1990. Discharge regimes were also defined for the period from 1971 to 2000, using the same clustering method. Besides this the grouping was also made for both periods together. The similarity among gauging stations was calculated on the basis of the Manhattan distance, but for their clustering in to groups the Ward’s method was used. The comparison between two periods and two methods has shown important climate changes and with that the time distribution of high and low waters, changes of type of precipitation due to higher temperatures and lesser differences between regime types. Finally we wanted to determinate the Nováky’s empirical classes of runoff regime stability so that they would have an arithmetic background. To reach that, we compared them with Pearson’s coefficients of correlation. With their modeled values, we proposed new stability classes
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