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Realtime flood propagation on the downstream of Bili-Bili reservoir with hydraulic routing
Sudarmin M.A.
Aip Conference Proceedings
Abstract
On January 2019, the biggest flood in the last decade struck Gowa and Makassar. The flood claimed enormous number of victims and caused severe damage to many buildings; this can be anticipated by Flood Routing. This study aims to analyze the flood hydrograph, flood propagation time, and to determine the flood inundation model during the flood downstream of Bili-Bili reservoir. This research was conducted through the three phases: delineation of watershed by using ArcGis 10.6.1, hydraulic routing by using HEC-HMS 4.5, and flood simulation by using HEC-RAS 5.0.7 integrated with RAS-MAPPER. The results indicated that the flood hydrographs occurring in the upstream was 3,319.7 m3/s and in the downstream was 2.961.4 m3/s, with the travel time of flooding lasted for 1 hour 44 minutes, as well as a model of realtime flooding in the downstream reservoir of Bili-Bili produced a flood surface area of 52.47 km2.