Hydrological Drought Frequency Analysis in Water Management Using Univariate Distributions

The study of extreme phenomena in hydrology generally involves frequency analysis and a time series analysis. In this article we provide enough mathematics to enable researchers apply wide range probability distributions analyses hydrological drought. presents drought methodology for the determination minimum annual flows, durations deficit volumes exceedance probabilities common water management. Eight statistical from different families with numbers parameters are used method ordinary moments linear estimate distributions. All mathematical characteristics necessary application eight analyzed distributions, moments, presented. performance is evaluated using relative mean error absolute error. For only that have lower bound close value should be used, defining characteristic having asymptotic at value. A case presented Prigor River. We believe use software without knowledge behind it not beneficial field technical hydrology; thus, dissemination methods models necessary. research was conducted within Faculty Hydrotechnics.