Analisis Wilayah Tergenang dan Perilaku Banjir pada Simulasi Kegagalan Bendungan Ciawi
Abstract. This paper presents the area potentially affected by flood inundation in case of Ciawi Dam failure and to make a map of the flood hazard areas. Analysis of the flood inundation and its behavior in this study were done by application of the ZhongXing HY-21 program. The application of software resulted some paramteres, i.e : the outflow hydrograph through the dam, analyzing the water level, flood travel time and determining the distribution of the affected areas by inundation. Further more from these parameters will be analyzed to determine the risk of inundation by determining the downstream hazard classification in term of water level and risk recipient population. Dam failure due to piping case scenario has the largest discharge outflow which is 83690,9 m3/s (± 0.52 hours at the process of the failure). The largest number of areas affected by inundation reached 21 Sub-districts of 6 Districts to overtopping case scenario. The classification of Ciawi Dam downstream hazard generally included in the category with a value of 3 (Intermediate Risk Level) and category 3 of Disaster Hazard Areas (water level > 2 m).
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