Scienceline Publications Journal of Civil Engineering and Urbanism 2252-0430 7 1 2016 January Prediction of Seasonal and Annual Rainfall using Order Statistics Approach of Gumbel and Frechet Distributions 12 17 http://www.ojceu.ir/main/attachments/article/56/J.%20Civil%20Eng.%20Urban.%207%20(1)%2012-17,%202016.pdf EN Vivekanandan N Central Water and Power Research Station, Pune, Maharashtra, India Prediction of seasonal and annual rainfall for a river basin has utmost importance for planning of irrigation and drainage systems as also for command area development. This can be achieved by deterministic, conceptual and probabilistic methods. This paper illustrates the use of Gumbel and Frechet probability distributions for modelling seasonal and annual rainfall for Krishna and Godavari river basins. Lieblein technique based on order statistics approach is used for determination of parameters of the distributions. Model performance indicators such as correlation coefficient, model efficiency and root mean square error are used for the selection of suitable distribution for modelling seasonal and annual rainfall. The study suggests the Gumbel distribution is better suited for prediction of seasonal and annual rainfall for Krishna and Godavari river basins. Correlation Frechet Gumbel Mean square error Model efficiency Rainfall