<![CDATA[Waterlogging caused by increased surface runoff is a major challenge for drainage infrastructure in semi-urban areas. This study aims to analyze design flood discharge, evaluate the hydraulic capacity of existing drainage channels, and formulate management recommendations in Pasar Melintang Village, Lubuk Pakam Subdistrict, Deli Serdang Regency. A descriptive-quantitative methodology was applied by integrating primary measurement data of notched trapezoidal channels with secondary rainfall data from Global Precipitation Measurement (GPM) satellite (2015–2024). Frequency analysis using the Log Pearson Type III distribution yielded a design rainfall of R24 = 73.279 mm/day (T = 2 years), rainfall intensity of I = 181.083 mm/hour (Mononobe method), and design flood discharge of Q = 0.224 m3/second (Rational method, CW = 0.464, A = 0.96 ha). Evaluation using Manning’s Equation indicates an existing channel capacity of QS = 0.219 m3/second. The capacity deviation of 2.23% is well below the 5% technical tolerance threshold, confirming that the channel's geometric design is adequate. The capacity deficit stems from physical obstructions (15 cm sedimentation, wild vegetation, and household waste) rather than geometric design errors. A structured periodic maintenance program is recommended to restore full hydraulic capacity.]]>
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