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Toll roads are currently one of the supporting factors for economic growth. So that if the function is slightly disturbed, obstacles will arise, which will hamper vehicle's journey using the toll road. Many factors hinder this toll road. One of the traffic obstacles is a flood disaster. Floods are also one of the biggest natural disasters in Indonesia. This study aims to calculate and assess the extent of flooding, which will impact toll roads. So that it can determine the impact and how to handle it. Applying the ten years returned rainfall periods, HEC_RAS simulation shows that the flood inundation area is 176.636,69 m, including toll road areas. The hydraulic simulation also indicates that the flood inundation area can be reduced by adding two 3.5 x 4 meter Box Culvert, while to minimize the traffic disturbance during the construction period, it is recommended to apply microtunneling method.

Study of Hydraulic Models in the Compilation of Alternative Management of Purbaleunyi Toll Road Inundation (+ STA 131)