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.
Flood is one of the natural disasters that occur in Indonesia frequently. At least there are 8.498 occurrences since 1980 through Indonesia. In order to prevent and resolve that natural disaster, some actions should be done. To know the best solution to solve flood, we should know the flood characteristic (what causes it, the inundation area, the height, how long it occurs, and etc.). The characteristic of flood will be easily known only when the flood occurs. Thus, it is necessary to build a model with high accuracy. The model was obtained by re-modeling the inundation incident that happened on March 7th, 2018, and validated with observed data from several locations in that period. The result shows a good agreement with the observed data. This is evident from the extent and depth of the puddle from the modeling results similar to the value of field observation data. From the results, it can be concluded that the Cikalumpang River model has been obtained with a good correlation. From field observations, it is known that flooding is caused by quite complex problems, such as decreasing river capacity due to illegal building construction, sedimentation, land cover change, and climate change.
Indonesia experiences floods which are rarely well documented in map form. Monitoring and estimating the impact of floods at almost the same time involves using a variety of techniques, from digital maps to using detailed surveys or remote sensing techniques. However, when using remote sensing techniques, the results depend on the data acquisition time (day or night) as well as by weather conditions. However, this obstacle can be overcome by using radar satellite imagery. The purpose of this study is to describe the surface of the water bodies affected by flooding in the Cidanau-Ciujung-Cidurian River Basin from 2016 to 2020. For this case study, the Sentinel-1 SAR Band data obtained from the ESA (European Space Agency) were used as research data. Data sets are retrieved before, during or after a flood and processed using SNAP Desktop. The result will display flood conditions using RGB color as a sign between wet areas (inundated) and dry areas (not inundated).
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