<![CDATA[Flooding in densely populated urban residential areas is generally caused by limited drainage capacity, high impervious surface coverage, and relatively flat topographic conditions. This study aims to evaluate the performance of the drainage system in Jalan Ismailiyah, Kota Medan, using a hydrological-hydraulic modeling approach based on high-resolution Digital Elevation Model (0.5 m) and EPA SWMM. Surface flow pattern analysis indicates that the study area has a low slope (<2%) with minimal micro-topographic variation, resulting in slower runoff and increased ponding potential. Simulation results reveal that most conduits operate under full flow conditions for more than 4 hours and experience capacity limitations. Several critical nodes exhibit significant flooding with high discharge and flood volume, indicating system failure in conveying runoff. These findings are consistent with field observations, where inundation occurs even under no-rain conditions and increases up to 40–50 cm during rainfall events. Improvement scenarios include channel normalization, capacity enhancement in critical segments, inlet addition, and implementation of local infiltration systems. The results demonstrate that a micro-topography-based approach combined with scenario simulation is effective in identifying drainage problems and formulating practical solutions for dense urban areas]]>
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