<![CDATA[Urban development, such as in Cilegon City, directly affects the drainage system, particularly due to land use changes that increase surface runoff. One of the affected areas is the KH. Wasyid South Ring intersection, which often experiences flooding during heavy rainfall. This problem is generally caused by the insufficient capacity of the drainage channels compared to the runoff generated. This study was conducted to analyze and evaluate the performance of the existing drainage system and to provide recommendations for channel redesign using the Storm Water Management Model (SWMM) software. Daily maximum rainfall data over a ten-year period were analyzed using the Log Pearson Type III distribution to determine the design rainfall. These values were then used to develop the Intensity–Duration–Frequency (IDF) curve, and discharges were calculated using the rational method. The analysis results served as inputs for SWMM modeling to simulate the conditions of the existing channels as well as improvement scenarios. Based on the simulation results, the highest peak discharge occurred at the 25-year return period, amounting to 2.122 m³/s, while the existing channel capacity was insufficient to accommodate this flow. This caused overflow at several channel nodes. After adjusting the channel dimensions in the model, system performance improved significantly. Therefore, SWMM has proven effective in evaluating and redesigning drainage systems in a technical, spatial, and quantitative manner.]]>
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