Precipitation Management with the Help of Rain Catchment Surfaces in Semi-arid Areas (Case Study of the Quyjeq Catchment Basin).

مدیریت نزولات جوی به کمک سطو ح آبگیر باران د ر مناطق نیمه خش ک)مطالع ه مورد ی حوزه آبخیز قویجق (

Low rainfall with improper temporal and spatial distribution is a significant problem in arid and semi-arid areas. Due to the lack of water resources and the increasing water demand, access to new water resources is necessary. Rainwater collection is one of the most prominent methods of rainwater exploitation management to deal with water shortage which is developing rapidly in many areas. Considering the diversity and breadth of rainwater collection methods, serious attention should be paid in choosing the influencing factors and the type of criteria combination method. In this article, in order to determine the places prone to the construction of rain catchment surfaces for livestock drinking, first the effective factors were determined with the studies conducted and the characteristics of the area. Seven factors were considered, including slope, land use, soil depth, distance from fault and waterway, proximity to livestock farming, and prevailing wind direction. The factors were ranked using the fuzzy logic technique. This involved dividing them into nine separate parts. A geographic information system was then used to overlap these layers. The results of this overlap were classified into five classes: poor, average, relatively good, good, and very good. The rainwater collection areas for each class were 44.01 km², 53.94 km², 30.31 km², 30.48 km², and 12.51 km², respectively. The result of using the fuzzy logic method along with the geographic information system in this study facilitated and increased accuracy in determining the areas prone to rainwater collection. Also, based on the results of this method, the south and southeast part of the region had the first priority for the construction of rain catchment surfaces. Therefore, it can be used to collect rainwater and store it for future use. The findings of this research work will help policy makers and decision makers to implement different rainwater collection structures in the study area to overcome water shortage problems. [ABSTRACT FROM AUTHOR]

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