Flash Flood Susceptibility Assessment and Zonation Using an Integrating Analytic Hierarchy Process and Frequency Ratio Model for the Chitral District, Khyber Pakhtunkhwa, Pakistan

Pakistan is a flood-prone country and almost every year, it hit by floods of varying magnitudes. This study was conducted to generate flash flood map using analytical hierarchy process (AHP) frequency ratio (FR) models in the ArcGIS 10.6 environment. Eight flash-flood-causing physical parameters were considered for this study. Five based on digital elevation model (DEM), Advanced Land Observation Satellite (ALOS), Sentinel-2 satellite, including distance from river drainage density slope, elevation, land cover, respectively. Two other geology soil, consisting different rock soil formations, respectively, where both layers classified their resistance against water percolation. One parameter rainfall. Rainfall observation data obtained five meteorological stations exist close Chitral District, Pakistan. According its significant importance occurrence flood, each criterion allotted an estimated weight with help AHP FR. In end, all integrated weighted overlay analysis which influence value given highest value. gave output terms risk zones: very high risk, moderate low risk. results, 1168 km2, that is, 8% total area, showed occurrence. Reshun, Mastuj, Booni, Colony, some villages identified as high-risk zones have been drastically damaged many times floods. pioneering field provides policy guidelines managers, emergency disaster response services, urban infrastructure planners, hydrologists, climate scientists.