IMPACT OF OPEN CHANNEL SEDIMENTATION ON PLUVIAL FLOOD SEVERITY IN LOWLAND CITY WITH SEWER AND OPEN CHANNEL DRAINAGE NETWORKS

Abstract

 Pluvial flooding, a common and destructive event, occurs when natural or engineered drainage systems are overwhelmed by intense or prolonged rainfall. A significant factor contributing to inadequate drainage capacity is sediment accumulation in minor drainage systems, especially open channel drains in lowland areas. Conventional studies have mainly focused on experimental evaluations of drainage capacity loss due to sediment. This study employs the InfoWorks ICM model to innovatively assess the impact of sediment depth on pluvial flood severity in lowland drainage systems. Our findings provide a groundbreaking quantification and visualization of how sediment affects flood inundation, revealing the combined influence of increased rainfall and sediment depth on flood duration and extent.