Studi Analisis Limpasan Permukaan Gampong Lamtamot Kabupaten Aceh Besar.

Abstract

This study aims to analyze surface runoff and evaluate the capacity of drainage channels S1, S2, and S3 in Gampong Lamtamot, Lembah Seulawah District, Aceh Besar Regency, which frequently experiences flooding during rain events. Hydrological analysis was conducted using maximum daily rainfall data over a 10-year period (2014–2024) from the BMKG Indrapuri Station. Frequency analysis was performed by comparing Normal, Log-Normal, Gumbel, and Log-Pearson Type III distributions. The Chi-Square and Smirnov–Kolmogorov goodness-of-fit tests indicated that the Log-Pearson Type III distribution was the most suitable model. Runoff discharge was calculated using the Rational Method with a 2-year return period as the design basis for residential micro-drainage. The results showed that channels S1 and S2 are still capable of accommodating the runoff discharge. However, in channel S3, the land runoff discharge (Q_land = 1.232 m³/sec) exceeds the existing channel capacity (Q_channel = 0.708 m³/sec). Therefore, a redesign of the S3 channel dimensions is required to prevent routine flooding in the area.