ABSTRACT
The choice of distributions to be used in flood frequency analysis has been a topic of interest for a long time. Hazen looked at this question in the context of storage design for municipal water supply. Probability distributions that best fit distributions of annual precipitation and runoff series were analyzed by Markovic. A method of selection of a distribution which best fits the data was proposed by Gupta. Gupta’s method is based on the coefficient of determination. A nonparametric test is used to detect differences between distributions. The psi test indicated good fit for 10 data sets, marginal fit for 6 data sets, and unacceptable fit for 9 data sets. The regional estimates of flood flow statistics are investigated in the context of regionalization and regional homogeneity studies. The method of assigning homogeneous regions is geographical similarity in soil types, climate and topography.
