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The research aims to assess flood susceptibility areas and catchment areas in the four districts of Suphanburi province using Geographic Information System (GIS). According to Analytical Hierarchy Process (AHP), five parameters used for obtaining a map of flood susceptibility areas were rainfall, soil drainage, slope, distance from river, and land use. Three parameters were used for the catchment areas: slope, distance from river and land use. The results showed that most of the flood susceptibility areas (44.12%) were in moderate flood risk. The high flood risk areas (29.15%) were in Bangplama district and Songphinong district. 22.19% of these areas, or about 849 km2, were suitable to use as catchment areas. According to the simulation of flood susceptibility and catchment areas, Jorakae Sampan subdistrict, Bangtakien subdistrict, Taling Chan subdistrict and the border between Cokcothow and Cokkarm subdistricts were suitable to be developed as flood catchment areas.
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