Evaluasi Saluran Drainase Terhadap Genangan Banjir di Kawasan Desa Kelapapati

This study aims to evaluate the performance of the drainage system in Kelapapati village, Bengkalis District, Bengkalis Regency, which frequently experiences flooding during heavy rainfall. The evaluation involved collecting rainfall data, existing drainage conditions, and regional characteristics. Hydrological analysis employed the Log Normal distribution, determined as the best fit based on Chi-Square and Smirnov-Kolmogorov tests. The design discharge was calculated using the rational method, yielding a planned peak discharge of 89.68 m³/s for a 5-year return period. Hydraulic capacity analysis was conducted using HEC-RAS software. Results show that most of the existing drainage channels are unable to accommodate the planned discharge, leading to overflow and residential inundation. Additionally, blockages due to
waste and sediment further reduce drainage performance. These conditions highlight the need to review channel dimensions and drainage management strategies.It is recommended that local authorities redesign the drainage system, implement regular maintenance, and raise public
awareness about keeping channels clean as part of flood mitigation efforts.