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 km2. 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
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