Establishing a reliable rating curve is an integral part of water resource engineering. The present paper is a
review of data driven techniques used for modelling the stage discharge relationship over the last two
decades. Over the year's several data driven techniques such as ANN, SVM, MT, fuzzy logic and GA have
been applied by researchers in quest of arriving at a reliable technique to model the stage discharge
relationship. Although, during this period several techniques have been used to establish the stage discharge
relationship but the application of modern optimization tools such as ACO, PSO or PS has remained limited
in this field. Therefore, application of modern optimization techniques and their comparison with existing
literature would be appreciated in near future.