The Master's thesis presents a statistical analysis of the discharge values on the watercourses of
the Planina polje and precipitation in the selected hydrographic catchment area in the case of
two extreme precipitation and flood events in 2014. The 64-day period in winter 2014 and the
47-day period in autumn 2014 were selected for study. Data on daily discharge and precipitation
levels was prepared below for the statistical analysis of the correlation between discharge and
precipitation values. The correlation between the discharge values of the Unica and the
Malenščica with the Pivka and the Stržen was calculated with Pearson’s and Spearman’s
determination coefficients. The cross-correlation function was used to analyze the statistical
correlation of precipitation in Postojna, Cerknica, Planina and Jurišče with the Unica and
Malenščica discharge values. The results of the correlations of statistical analyses of the
discharge of the Planina polje’s watercourses with the watercourses in its catchment, as well as
the results of cross-correlation of precipitation in the selected catchment with Unica discharge
generally show relatively low correlation with a few exceptions. The values of Pearson's
determination coefficients (R2) of the Unica with the Pivka and the Stržen range from 0.33 to
0.70, while the Unica with the Malenščica ranges from 0.69 to 0.96.The highest values of the
cross-correlation function of the discharge values of the Planina polje’s watercourses and
precipitation in the catchment are low (0.09–0.15) in the case of the studied flood events and
are achieved with relatively long time lags (from 14 to 24 days). The reliability of the results
and findings is conditioned by the quality of the input data of the discharge values, which at the
time of the research proved to be extremely unreliable during floods of the Planina polje.
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