FLOOD RISK STUDY IN THE DOWNSTREAM OF KRUKUT RIVER, DKI JAKARTA

• Main Author: Rifdah Taufik, Salsabila
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67586
• Institution: Institut Teknologi Bandung

Flood risk is the possibility of loss such as fatalities, damage or loss of property that can arise as a result of a flood hazard with a certain intensity in the affected area. DKI Jakarta is one of the provinces that often experiences flooding, which geographically 40% of its entire area has an elevation lower than sea level. In this study, the solution to overcome losses is do a disaster risk study. The vulnerability index is calculated based on the asset exposure multiplied by the sensitivity for the specific intensity of the disaster, while the capacity is calculated based on the area's ability to withstand or recover from the disaster. The hazard index is predicted based on the results of 1D2D flood modeling using HECRAS software for 2 river sections, Krukut River and Ciliwung River, this model will be made into existing and planned conditions. The design discharge for 25 years and 100 years in the Krukut watershed is 236 m3/s and 305 m3/s, it caused inundation area of 97 hectares and 138 hectares in the existing conditions. The hazard index is also calculated from scanario model. Scenario A is dredging the bottom of the Krukut River to dispose sediment in the river channel, that carried from a watershed with a high erosion rate. Scenario B is the use of open space as wetlands, this scenario is predicted to increase flood storage capacity. Scenario C or the scenario for the utilization of the old Ciliwung River channel was recommend to be the solution because some of the flow entering the West Flood Canal will be diverted to the old Ciliwung channel, thereby reducing the peak flood discharge. Based on these results, it is known that scenario A is the most influential scenario on the inundation area, which is able to reduce its area by 42%.