Tidal Influence Analysis Due to Development of Retaining Wall for Flood Control in Downstream Bekasi River
Farianda Yubi Eka Putra 1,2 a), Faradinda Prabandini 1,3, b), Ana Nurganah Chaidar 1

1) Master of Water Resources Management Study Program, Bandung Institute of Technology
2) PT Brantas Abipraya (Corp),
3) Directorate General of Water Resources , Ministry of Public Works and Housing

Abstract

The downstream area of Bekasi River lies within a mainly flat terrain, with over 80% of the downstream slope inclination measuring less than 8%. This studied here, extends downstream from the Bekasi dam and terminates at the junction where it meets the CBL River. Understanding the causes of this flooding requires analyzing tidal fluctuations since Downstream Bekasi River directly interfaces with the CBL River, which flows directly into the sea 10 km downstream. The principal aim of this study is to evaluate the impact of tides on Bekasi River. The methodology involved gathering primary and secondary data, which served as inputs for modeling tidal influences using the HEC-RAS application. Utilizing the L-Square method, tidal data analysis revealed the HWL at 2.05 meters, MSL at 1.35 meters, and LWL at 0.65 meters. Following this, hydrological analysis utilizing rainfall and discharge data resulted in a planned discharge of Q10 at 322.14 m3/s. Modeling was conducted under two scenarios: Q10 discharge during flooding and Q10 discharge during normal conditions. The modeling results indicated an absence of tidal influence during the Q10 flood discharge of 322.14 m3/s. However, under normal Q10 discharge, tidal effects extend up to 2.6 km along Bekasi River.

Keywords: Tydal, HEC-RAS modelling, L-Square, Downstream Bekasi River, Flood Discharge

Topic: Engineering