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The present paper analyzes the spatial and temporal variability of the maximum flow in small river basins. The maximum flows were also analyzed taking into account the threshold values ​​corresponding to the defense levels. The series of important events, were then statistically analyzed to determine trends (Mann-Kendall test) and variations in the frequency of occurrence, analysis that was applied seasonally and annually. From the analysis performed, the trends regarding the maximum flows for the studied river basins were generally negative (decreasing), statistically significant only for the months of February, March, June, August, December and for the multiannual average, in the case the Casimcea river basin. The highest flow recorded during the operating period of the hydrometric stations analyzed until 2016, was at Râmnicu Vâlcea, in the hydrographic basin of the Olănești river (1969 and 2014), and in the hydrographic basin of the Feernic river (H.S. Simonești) in 2005. The hydrological phenomenon having a very destructive impact, causing significant social-economic damage.