Assessment of Flood Propagation Due to Several Dams Break in Banten Province

Abstract

River Basin Organization of Cidanau-Ciujung-Cidurian (RBOC3) is a water authority in Banten Province that has the planning of six rockfill dams in development planning, i.e Karian, Pasir Kopo, Tanjung, Cilawang, Sindang Heula, and Cidanau Dam. Regarding to the emergency response plan, it is necessary to have an inundated area estimation due to a dam break. The objective of this study is to develop a flood hazard map based on dam break analysis in selected dams in Banten Province so that the flood situation can be understood. HEC-RAS software was utilized to simulate the two-dimensional flood propagation. The result shows that the total of inundation due to all dam failure is around 152 km 2 . The effect of this Karian Dam submerges 46% of the total area and volume of inundation from six rockfill dam failure. Also, Sindang Heula Dam and Cilawang Dam were considered as the second and third biggest impact on flood volume compared to the others dam break. This study can be used as the initial flood hazard map information in order to reduce flood damage in the future period under the massive construction. Furthermore, the result of this simulation could be applied to emergency response plans as the requirement of dam operation.

An Assessment of Flood Hazards Due to the Breach of the Manggarai Flood Gate

“…The flood model to measure hazard level was simulated utilizing the 1D -2D coupled model of HEC-RAS version 6.0 as a well-recognized software to emulate flood occasions, as discussed in [8], [31], [34], which is also suitable for overtopping breach simulation [26], [27]. A DEM map with an 8.5 m resolution is used as a terrain map to create floodplain geometry.…”

“…The above discussion has the breach of Manggarai Gate is a high potential flood hazard scenario that should be encountered in improving flood risk reduction programs in the study area. A good enough prediction of flood propagation generated by dam break or gate breach has been discussed by several previous studies based on the physical model and or mathematical model [22][23][24][25][26][27][28][29].…”

“…Based on those studies, it is seen that there are several possible breach mechanisms of Manggarai Gate. However, the discussion of this paper focused on toping cases only [22][23][24][25][26][27][28][29]. This over-toping flow condition may occur due to the influence of the Solid Waste Blockages and or sedimentation on the upper part of the Manggarai gate.…”

“…Dam breach characteristic has been discussed in detail based on experimental work and numerical model [22][23][24][25][26][27][28][29]. These previous researches have emphasized discussing the dynamics of variations in depth, velocity, and propagation time without discussing the breach mechanism.…”

Flood Inundation and Dam Break Analysis for Disaster Risk Mitigation (A Case Study of Way Apu Dam )

“…In addition, [4] conducted an experimental model of dam break flow around several blockage configurations, while [5][6] conducted flood inundation numerical modeling due to break in Way Sekampung dam (Lampung) and Cipanas dam (West Java), using Hec-Ras model. [7] conducted the assessment of flood propagation due to several dams break in Banten Province to estimate the inundated area due to a dam break. This study therefore aims to analyze flood inundation mapping and break in Way Apu dam, using HEC-RAS 5.0.7 to identify the risk zone and early warning system of flood mitigation, within the dam's downstream area.…”