عنوان مقاله [English]
The need to produce agricultural products and the limitation of water resources, have led to dehydration. According to the International Organization for Water Management, land development will increase food production. Therefore, considering the effective role of rainfed development approach in optimizing water resources management, in this study, using SWAT, to evaluate the time and space distribution of soil moisture storage in order to monitor the susceptible areas of rainfed farming, is under the basins of Khorramabad watershed. . The results showed that the soil moisture storage potential has a range of between 600 and 420 millimeters per year. Therefore, it is possible to cultivate crops with this water requirement in rainfed areas in different parts of the basin. Among the existing cropping patterns, it is possible to cultivate wheat, barley, pea and lentil as dryland. The replacement of rainfed farming with these products could be as high as 153.6 million cubic meters, which would save water from water conversion to rainfed. Replacing water products including alfalfa, watermelon, apple and rice in Central plains and Kamalwand with a total area of 17,900 hectares will result in better water management in the basin with lower crop yields including saffron and moss. Became the replacement would save 116.78 million cubic meters of water in one crop. The results showed that changing the pattern of irrigation of susceptible agricultural products from rainfed water, as well as removing water products, would save 217.29 million cubic meters of water consumed during a crop period.