Optimization of Sustainable Drainage Strategies in Reducing Flood Risk

Abstract

Areas with suboptimal drainage systems, such as the Old Market Area in Serang City, often experience waterlogging when the volume of surface runoff exceeds the capacity of the available drainage channels. To address this issue, a comprehensive evaluation of the existing drainage system and the implementation of an environmentally friendly sustainable drainage concept are required. This research aims to evaluate flood discharge, assess the capacity of the existing drainage system, and design a new, more adaptive drainage system. The methods used include field surveys, observation of existing conditions, flood discharge analysis, and evaluation of channel dimensions based on road drainage planning guidelines. From the analysis results, it was found that the planned discharge for the primary channel is 0.247 m³/second, while the actual channel discharge reaches 0.749 m³/second, indicating a mismatch between the channel capacity and actual needs. The flat and uneven topography exacerbates flooding in this area, necessitating the redesign of the channel with a base width of 0.94 meters and a water surface height of 0.94 meters, as well as the installation of infiltration wells. With the implementation of infiltration wells, it is expected that runoff volume can be reduced, and the quality and quantity of groundwater can be improved, making the drainage system more resilient in facing the challenges of climate change and urbanization.