Intercomparison of Estimators of EV I for Determination of Design Rainfall Depths

摘要

Extreme value analysis of recorded rainfall is often a requirement for arriving at the basic structural and other design parameters for large civil engineering projects. The design parameters obtainable using extreme value analysis includes design storms and floods. This paper gives details of a study involving the use of seven different methods for determination of parameters of Extreme Value Type I (EV I) distribution for estimation of rainfall for Karjat and Panvel sites. Anderson-Darling test was used for checking the goodness of fit of the distribution to the recorded data. Diagnostic analysis, involving relative absolute error and relative mean square error, was employed for evaluating appropriateness of the method for determination of parameters of EV I. The study shows the principle of maximum entropy method to be the best suited, among seven methods studied, for determination of parameters of EV I for estimation of rainfall for the data under study.