عنوان مقاله [English]
Overexploitation of groundwater resources may result in lowering the groundwater table at a faster rate. In order to balance groundwater exploitation with recharge, the major remedial measures suggested are to strengthen groundwater management, to adopt water demand policies, to raise water use efficiency, and to increase water supply from other sources. The relationship between farmers’ income and the withdrawal was then examined using goal programming with 10, 20 and 30 percent deficit from water consumption target. The needed data were obtained from a random sampling. 112 farmers were chosen in the selected villages. The results at plain level showed that annual groundwater pumping; with optimal control is less than current groundwater pumping at discount rate less than 18 percent. The decrease percentage on benefit was less than that of the withdrawal for all representative farmers, based on the result obtained from goal programming. For example with the equal weight assigned to the water consumption and to the benefit objective, the water consumption target can be fully achieved. In this case products with deficit irrigation strategies and sprinkler irrigation method are used in the crop pattern. This study also revealed that the application of deficit irrigation strategies and sprinkler irrigation method lead to a decrease in extracting groundwater compared to the current status. Finally, the results can help farmers to choose crop pattern, irrigation strategies and irrigation method in such a way that both farmers’ income and withdrawal are simultaneously optimized.