For adopted 12 drought definitions and basing on 49-year time series of daily flows at four cross-sections in the Mała Wisła catchment, it was found that the probability distributions of drought duration T and drought deficit V may be described by the lognormal distribution with parameters estimated by the maximum likelihood method. The goodness-of-fit quality was tested by the Anderson-Darling and Cramér-von Mises tests. Both test did not reject the tested distribution neither for any definition nor any cross-section, as the p-values were greater than 15% for the former test and greater than 20% for the latter.
ul.Warszawska 24, 31-155 Kraków www.iigw.pl mail:sweglar@pk.edu.pl
ul.Warszawska 24, 31-155 Kraków www.iigw.pl mail:kbg@iigw.pl