PROBABILITY ANALYSIS OF EXTREME MONTHLY RAINFALL IN BAGHDAD CITY, MIDDLE OF IRAQ

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  Ali H. Al Aboodi   |   

Data sets of the 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 tests were done using a commercial version of HYFRAN. Five distributions are used in this research, which is: - Normal, Pearson Type III, Lognormal, 3-parameter lognormal, and Gumbel. Estimation of theoretical distribution is achieved by using the maximum likelihood method and adequacy test is carried out using the chi-square test. Lognormal, 3-parameter lognormal, and Gumbel distributions seem to be suitable for representing maximum monthly rainfall in the study area.