Spatial Estimates of Flood Damage and Risk Are Influenced by the Underpinning DEM Resolution: A Case Study in Kuala Lumpur, Malaysia

The sensitivity of simulated flood depth and area to DEM resolution are acknowledged, but their effects on damage risk estimates less well understood. This study sought analyse the relative benefits using global DEMs different sizes, 5 m AW3D Standard, 12.5 ALOS PALSAR 30 SRTM, simulate inundation, risk. HEC-RAS 2D model was adopted for simulations, Toba River in Klang Basin Malaysia chosen case study. Simulated inundation areas from coincide most with reported flooded areas, coarser-resolution did capture some areas. increased as got finer. As a result, returned almost double compared PALSAR, quadruple SRTM building-level analysis. findings indicate that finer-resolution improves modelling could provide greater coarser DEM. However, remain useful data-scarce regions or large-scale assessments efforts manage