OPTIMASI SISTEM DRAINASE PERKOTAAN DENGAN INFRASTRUKTUR HIJAU MENGGUNAKAN STORM WATER MANAGEMENT MODEL (SWMM)

Abstract

Urban flooding in Rajabasa Raya Village, Bandar Lampung, is driven by high rainfall, increasing impervious surfaces, and insufficient drainage capacity. This study aims to optimize the performance of the urban drainage system through the implementation of green infrastructure using the Storm Water Management Model (SWMM). Primary data were collected from field surveys employing drones, total stations, levels, and GPS devices, while secondary data were obtained from DEMNAS, topographic maps, BMKG, and BPS. The simulation results for several catchment areas indicate high runoff coefficients in built-up zones, with some drainage channels operating near their full capacity and thus susceptible to overflow. The application of green infrastructure, such as green open spaces and infiltration areas, reduces peak discharge and hydraulic pressure in the channels, thereby improving the performance and resilience of the drainage system under extreme rainfall events.