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All Journal Nusantara Civil Engineering Journal
Najla Ayu Febrina Nasution
Universitas Andalas
Civil Engineering, Building, Construction & Architecture

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Hydrological Simulation Analysis for The Design of The Sei Busui Batuaji-Kuaro Bridge in East Kalimantan, Indonesia Aco Wahyudi Efendi; Najla Ayu Febrina Nasution
Nusantara Civil Engineering Journal Vol 5 No 2 (2026): Nusantara Civil Engineering Journal (July - December 2026 - INPRESS)
Publisher : Civil Engineering Dept, Balikpapan State Polytechnics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/nuce.v5i2.714

Abstract

The Sei Busui Batuaji-Kuaro Bridge in East Kalimantan, Indonesia, is a critical infrastructure project requiring rigorous hydrological analysis to ensure resilience against extreme flood events. This study presents a comprehensive hydrological simulation to determine design flood discharges and maximum water levels (MWL) using rainfall data from 2016–2025. Rainfall frequency analysis employed the Log Pearson Type III distribution, validated with Chi-square and Smirnov-Kolmogorov tests. Flood discharges were estimated using five methods: Rational, Weduwen, Haspers, HSS-Gamma I, and HSS-Nakayasu. The HSS-Gamma I method was selected for its applicability to medium-sized catchments (127.58 km²), yielding a design discharge of 1,623.15 m³/s for a 75-year return period. Hydraulic analysis confirmed a freeboard of 1.693 m, exceeding safety standards. The findings emphasize the importance of region-specific hydrological methods and continuous monitoring to mitigate flood risks
Co-Authors Aco Wahyudi Efendi