Sharif University of Technology Scientia Iranica 1026-3098 16 6 2009 12 01 Development of Management Schemes in Irrigation Planning: Economic and Crop Pattern Consideration 3259 EN A. Ahmadi Department of Civil Engineering,University of Tehran S. Nazif Department of Civil Engineering,University of Tehran M. Karamouz Department of Civil and Environmental Engineering,Amirkabir University of Technology Journal Article 2010 05 12 Increasing population has dramatically increased the request for agricultural products. In addition, lands and water resources with suitable quality are limited. Therefore, optimal allocation of limited resources to different demands has become very important in recent years. In this study, a model is developed to optimize a water resources allocation scheme considering the conjunctive use of surface water and groundwater resources, as well as determining a suitable crop pattern. The economic objective function of the optimization model is to maximize the net benet, considering the water pumping cost, crop cultivation cost and the benet of total crop production during the study time horizon. The eect of a marginal water decit in the reduction of crop yield and water table uctuations are considered. A genetic algorithm is used to solve the optimization model. The proposed model is applied to the Varamin plain to determine the optimal crop mix and water allocation from surface and groundwater. In order to evaluate the results of the model, the performance indices are calculated. The eect of imposed policies on the crop pattern is investigated through the denition of two scenarios and the results are compared. Also, the potential of the study area, for applying decit irrigation strategies using economic analysis, is investigated. https://scientiairanica.sharif.edu/article_3259_7ea80ed7eb3876b4a690ac07f9871a74.pdf