IRRIGATION PLANNING - INTEGRATED APPROACH

An integrated optimization model is developed for planning irrigation systems. In this work, surface reservoir capacity, ground-water and sp ring withdrawal, delivery system capacities (including canals, pumping stations, and tunnels), hectares of land to be developed for irrigati on, and cropping pattern are considered as interacting parts of the sy stem. Moreover, the effect of the costs due to drainage, land leveling , and irrigation network construction are also considered. The model i s capable of integrating other decision variables. The system is optim ized by means of a chance-constraint optimization model. The model use s mixed integer linear programming to maximize the net benefit associa ted with the development. To linearize a collection of interrelated no nlinear cost functions, a new generalized technique is developed. Rega rding the linearization of nonlinear cost functions, the technique red uces the size of the models and excludes any possible infeasibility th at may occur in the models. Results generated by the application of th e model, along with the sensitivity analysis, provide a tool to select the optimum design considering the varieties of criteria involved.