Evaluation of The Impact of Concrete Median on Surface Drainage and Flexible Pavement Performance on The Paguyaman–Tabulo Road Section (Shortcut III Lahumbo)

Abstract

This study aims to evaluate the impact of concrete medians on surface drainage and flexible pavement performance on the Paguyaman–Tabulo road section (Shortcut III Lahumbo). The analysis was conducted using the Kirpich method for time of concentration, the Mononobe method for rainfall intensity, the rational method for runoff discharge, and Manning’s equation for drainage capacity. The results indicate that the runoff discharge exceeds the drainage capacity, potentially causing ponding, particularly around the concrete median, which is impermeable and obstructs flow distribution. However, the pavement performance evaluation using the Pavement Condition Index (PCI) method shows an excellent condition (PCI = 100) with no damage. Therefore, although there is a potential for ponding, it has not yet had a direct impact on pavement performance, but may reduce the service life in the future.