Perencanaan Sistem Drainase Jalan Pada Kawasan Kampus/Permukiman Untuk Mengurangi Genangan

Abstract

This study aims to analyze the capacity of existing drainage channels and plan an optimal road drainage system in the area of ​​the Indonesian Community Development University (UPMI) Medan and surrounding settlements to reduce flooding. The methods used include hydrological and hydraulic analysis based on maximum rainfall data for the 2014–2023 period. Hydrological analysis was carried out using the Double Mass Curve consistency test, determining the probability distribution using Gumbel, and calculating rainfall intensity using the Mononobe method. The design discharge was calculated using the Rational Method, while the channel capacity was analyzed using the Manning equation. The results showed that the design rainfall intensity for a 10-year return period of 92.1 mm/hour resulted in a design discharge of 4,149 m³/sec. The existing channel capacity was only 0.131 m³/sec or approximately 3.2% of the design discharge, so it was unable to accommodate runoff and caused flooding. The design of a new channel with a trapezoidal cross-section (1.45 m base width and 1.12 m depth) resulted in a capacity of 4,151 m³/s with a flow velocity of 1.44 m/s and subcritical flow conditions. In conclusion, the inundation in the study area was caused by inadequate channel capacity and low maintenance. The planned drainage system was able to technically address these problems. Implementation of this design has the potential to significantly improve drainage performance, with the support of routine maintenance and the application of water conservation concepts. Further research is recommended to examine the integration of the drainage system with an environmentally-based approach.