Determining the optimal cultivation area and pattern of agricultural water consumption in order to manage multi-objective planning

Due to extensive agricultural activities and the need for significant irrigation, water consumption in the agricultural sector has increased. Therefore, providing solutions to reduce water consumption is an important issue. For this purpose, the optimization model was calculated and presented separately using the multi-objective genetic algorithm (NSGA-II) with two functions of net profit and agricultural water consumption in the Shahriar plan(Tehran, Iran). Also, the optimal values of net profit, cultivation pattern, irrigation uses and gross irrigation requirement were estimated in the optimization model. The results showed that the highest net profit, cultivation area and the volume of optimal water demand are related to Islamshahr area, then Shahriyar area and finally Robat Karim have the most desired values. Shahriar area has the highest optimal water consumption in the agricultural sector, then Islamshahr and finally Robat Karim has the lowest optimal amount of agricultural water consumption. The highest ratio of net profit to cultivated area in the optimal condition was related to Robat Karim area, then Shahriyar area and finally Islamshahr area. Also, according to the cultivation area and the optimal water consumption of grape, pomegranate, onion, vegetables in each area, their net profit is appropriate and ideal. And grape is the best possible crop among them.The policy of optimal utilization of water resources has led to a reduction in the area under cultivation, the volume of optimal water consumption and the volume of water needs in the whole area compared to the current situation by 20.44, 49.71 and 20.35 percent.