A GIS-Based Hydrological Modeling Approach for Rapid Urban Flood Hazard Assessment

Urban floods are detrimental to societies, and flood mapping techniques provide essential support for decision-making on the better management of risks. This study presents a GIS-based characterization methodology rapid efficient identification urban flood-prone areas, which is especially relevant large-scale hazards emergency assessments data-scarce studies. The results suggested that optimal was achieved by adopting median values thresholds local depression extraction, topographic wetness index (TWI) aggregation analyses. showed constraints extraction TWI methods proposed improve performance. A new performance indicator further introduced evaluation ability hazard mapping. It shown developed has much lower demand data computation efforts in comparison traditional two-dimensional models and, meanwhile, provides relatively accurate robust hazards.