REDESIGN OF DRAINAGE CHANNELS ON THE RUNWAY STRIP AT ATUNG BUNGSU AIRPORT, PAGAR ALAM

Abstract

Atung Bungsu Airport has experienced an increase in water discharge in the runway-side drainage channel due to
changes in the catchment area from the runway extension project. The airport is also classified as category 3C according
to PR 21 of 2023, which requires a runway strip width of 140 meters on each side, thus necessitating the redesign of the
drainage system outside the runway strip. This study aims to evaluate the capacity of the existing channel and redesign
the drainage dimensions for the next 10 years. The methods used include rainfall data analysis with the Log Pearson III
distribution, rainfall intensity calculation, and maximum runoff discharge determination. The results show that the
projected runoff discharge for the next 10 years exceeds the capacity of the existing channel. Therefore, a redesigned
drainage channel using precast concrete in the form of a u-ditch with dimensions of 1 meter in width and 1 meter in
height is proposed.