One of the most important factors in the agricultural sector is the supply of water. There are numerous factors affecting the supply of water in the agricultural sector. One of these factors is urban development. After the agricultural and industrial revolution, urban revolution is one of the most important issues in the economic development of countries. Urban development has two implications for agricultural water use; this both increases the demand for agricultural crops and the consumption of water in the household sector, which both lead to a reduction in available water in the agricultural sector. Therefore, determination of the impact of urbanization on water consumption in agriculture is necessary. In this study, we have examined the extended positive mathematical programming method on the agricultural sector of Qazvin Province. The results of the study showed that 1% increase in urbanization would reduce water consumption in agriculture by 0.639 mm3 compared to the base year. Also, household water consumption will reach 92.92-761.9 mm3 in base year. On the other hand, the cultivated area and the production of some irrigated crops (wheat, barley, rapeseed, sunflower, other oilseeds, alfalfa) will decrease to 86.36 hectare and 346.6 tons. In the indirect effect of increasing urbanization, per each percentage urbanization, the household water consumption will decrease by 2.19 mm3, and after a 20-year horizon, the total capacity of the Taleghan Dam will be allocated to Tehran's household water,. So that, 288 mm3 of agricultural water will be reduced, and it will reduce the cultivated area for 28,250 (ha). Also, farmers' gross profits will be 10.5 percent lower than the base year which is a threat for Qazvin plain farming. Solutions were proposed to reduce the negative effects of the urban development phenomenon, including the use of modern irrigation systems in the agricultural sector will significantly increase irrigation efficiency. So that only 1% increase in irrigation efficiency can completely neutralize the direct and indirect negative impacts of urbanization on a 12-year mid-term horizon.

中文翻译：

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城市化对农业用水和生产的影响：扩展的正数学规划方法。

农业部门最重要的因素之一是供水。影响农业部门水供应的因素很多。这些因素之一是城市发展。在农业和工业革命之后，城市革命是国家经济发展中最重要的问题之一。城市发展对农业用水有两个影响：这既增加了对农作物的需求，又增加了家庭部门的用水量，都导致农业部门的可用水减少。因此，有必要确定城市化对农业用水的影响。在这项研究中，我们研究了加兹温省农业领域的扩展正数学规划方法。研究结果表明，与基准年相比，城市化水平每提高1％，农业用水量将减少0.639 mm3。此外，基准年的家庭用水量将达到92.92-761.9 mm3。另一方面，耕地面积和某些灌溉作物（小麦，大麦，油菜籽，向日葵，其他油料种子，苜蓿）的产量将减少至86.36公顷和346.6吨。在城市化程度提高的间接影响下，城市化程度每提高一个百分点，家庭用水量将减少2.19立方毫米，而在20年的发展期之后，塔莱根大坝的总容量将分配给德黑兰的家庭用水。这样一来，将减少288立方毫米的农业用水，减少耕地面积28,250公顷。此外，农民的毛利将为10。比基准年低5％，这对加兹温平原农业构成威胁。提出了减少城市发展现象的负面影响的解决方案，包括在农业部门使用现代灌溉系统将大大提高灌溉效率。因此，仅提高1％的灌溉效率就可以完全抵消12年中期前景中城市化的直接和间接负面影响。