Development of Management Schemes in Irrigation Planning: Economic and Crop Pattern Consideration


1 Department of Civil Engineering,University of Tehran

2 Department of Civil and Environmental Engineering,Amirkabir University of Technology


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 e ect
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 e ect 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