Intensity of the extreme rainfalls in the Republic of Macedonia

The object of this research is the analysis of intensity of rainfalls with different duration and returning period over the Republic of Macedonia. There are 8 meteorological stations in the Republic of Macedonia that have long-term (>30 years) pluviograph data. This data was completed and generated in some previous analyses. maximal daily (24 hours) values of rainfalls registered with Helmans totalizers, in Macedonia are 188 mm (g.s. Popova Sapka in 1979), and 175 mm (g.s. Demir Kapija) in 1995. Probabilities of their occurrence have been estimated testing and using difference distribution (Gumbel, Galton, Pirson, Freget, Bernoulli, Gauss). For that purpose the intensity of rainfall with different returning period (0,1 -50%) and duration (5-1440') has been processed In the follow table, theoretically estimated extreme rainfalls with 1% probability of occurrence on difference area RM are presented. After that, the intensity of the rainfalls expressed as [mm/min] and [1/s.ha] was estimated. The results have been used to draw the diagrams of intensity of rainfall for all 8 main meteorological stations in the Republic of Macedonia that have long-term pluviografic data. Based on the scatter diagrams some functions were defined. These functions in fact show correlation between rainfall intensity and their duration (i = f (t)). This paper gives two benefits. Firstly, the results are contribution to defining spatial-time defining of the extreme rainfalls in the Republic of Macedonia. Secondary, the results of this research gives us the opportunity, using the proper method, to define the probability of torrential rains in particular watersheds and to estimate real maximal water discharge with difference occurrence.(Author)