Drainage System Evaluation as An Effort to Reduce Flood Inundation in Gedebage Area, Bandung - West Java

Abstract

Flooding in Gedebage area of Bandung is a recurring chronic problem. Various factors are alleged to be the cause of floods other than natural factors, such as several river courses across the region, and topography. The increase of runoff due to rainfall is not proportional to the drainage capacity. There are only two outlets which are Cinambo outlet and Cisalatri outlet. Various efforts have been made, such as dredging channels, rivers and elevating roads. However, those efforts have not solved the problem yet. Integrated efforts from upstream to downstream to address flooding in this region are needed. This study presents the results of an alternative evaluation of flood mitigation with several scenarios such as improving drainage channel capacity, channel addition, and combination of improving flow capacity and retention basins. The hydraulic analysis was performed using EPA-SWMM model. The analysis result shows almost some segments are overtopping. Increasing carrying capacity only reduces a few segments from overtopping. It needs a combination of increased channel capacity by widening and deepening, adding channels, creating a retention basin to overcome Gedebage flooding problems.