Add to ORKGOvaj rad sastoji se od dva dijela. U prvom dijelu rada opisane su tri krivulje raspodjele: normalna, lognormalna i Gumbelova te sva njihova hidrološka obilježja i svojstva. U drugom dijelu rada dajemo prilagodbu maksimalnog, srednjeg te minimalnog godišnjeg protoka stanice "Klobuk" pomoću Gumbelove krivulje raspodjele.This study consists of two parts. In the first part of the study, three distribution curves are described: normal, lognormal and Gumbelov and all their hydrological characteristics and properties. In the second part of the paper, we are adjusting the maximum, mean and minimum annual flow rate of the cell "Klobuk" using the Gumbel's distribution curve