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A method for evaluating flood hazard and flood risk of east Bangkok plain, Thailand

A new method for estimating flood hazard is developed in this study for flat and low lying areas wherein floods have low flow velocity, large depth and long duration. The hazard was computed as a function of flood depth and duration, not only depth as in the past. The study area of 624 km2 in Bangkok suburban is divided into small grids, each of 200 m by 200 m. Because flood depth and duration have different dimensions, this new method categorized the depth and duration into four groups for small, medium, large and largest magnitudes represented by integers 1, 2, 3 and 4 respectively. The depth integer and duration integer of each grid were weighted by factors μ and (1-μ) respectively and summed up to obtain the flood hazard indicator. The factor µ was assumed between 0 and 1 and adjusted by trial and error until the computed hazard satisfactorily satisfied the hazard estimated from field and questionnaire surveys. For flood damage vulnerability, an established methodology was applied considering the vuln...