Probability analysis of extreme monthly rainfall in Baghdad city, middle of Iraq

Abstract EN

Data sets of highest monthly rainfall for the period (1887-1958) are used for evaluating the proper theoretical statistical distribution of extreme monthly rainfall in Baghdad city.

The frequency analyses and most statistical test were done using a commercial version of HYFRAN.

Five distributions are used in this research, which are : Normal, Pearson Type III, Lognormal, 3-parameter lognormal and Gumbel.

Estimation of theoretical distribution is achieved by using maximum likelihood method and adequacy test is carried out using chi-square test.

Lognormal, 3-parameter lognormal, and Gumbel distributions seem to be suitable for representing of maximum monthly rainfall in the study area.