ASSESSMENT OF FLOOD HAZARD AREAS USING ANALYTICAL HIERARCHY PROCESS IN THE YANG RIVER BASIN
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Abstract
The Yang River basin is also an area that is prone to repeated flooding. The main causes are the terrain downstream, which is the plain area, and the low drainage capacity of the river. When there is a large amount of water during the rainy season, it causes the water to overflow the banks and flood the community and agricultural areas, causing damage. The purpose of this study was to assess the flood hazard of the lower basin using the Analytical Hierarchy Process (AHP) combined with the Geographic Information System (GIS) to analyze six factors: elevation, land use, slope, soil permeability, average annual rainfall, and repeated flood. The results of the study will be a flood-risk map. It is divided into 5 risk levels: very low flood risk area of 4.929 sq. km. (14.078%), low flood risk area of 4.222 sq. km. (12.059%), medium flood risk area of 6.098 sq. km. (17.417%), high flood risk area of 9.706 sq. km. (27.722%), and very high flood risk area of 10.057 sq. km. (28.724%), respectively. The analysis results show that flood risk areas in 16 sub-districts (Bueng Kluea Sub-district, Selaphum District, Roi Et Province) have the highest flood risk areas, most of which are community and agricultural. The results of the analysis can be used to plan water management in the region to cope with flood problems.
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The published articles are copyright of the Engineering Journal of Research and Development, The Engineering Institute of Thailand Under H.M. The King's Patronage (EIT).
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