Andojo Wurjanto, Trika Agnestasia Tarigan, Julfikhsan Ahmad Mukhti
Lampung is currently vulnerable to flooding. There were 16 flood events in Lampung with the latest major flood, which occurred in February 2018, inundated 10 sub-districts. One of the main causes of flooding in Lampung is flash flooding caused by heavy rainfall on the upstream area. The villages along Way Seputih (Seputih River), one of the main rivers in Lampung, Indonesia, have been affected by flash flood for the last three years. One of the possible solutions to control the flood from causing heavy causalities is to create a flood route model of Way Seputih, which is the main focus of this study. In this study, a hydraulic model of Way Seputih is built by using HEC-RAS 4.1 software to simulate the effect of extreme rainfall and how it causes flooding along the Way Seputih. The hydraulic model is based on field topographic measurement, simulated tides, and synthetic hydrographs generated by rainfall data and validated by field water surface elevation measurement. The output of HEC-RAS 4.1 in form of water surface elevation time series of locations along the Way Seputih is then used to build a flood route model. By using this model, the flooding time interval between villages along the Way Seputih can be predicted which can be used as the basis for an early warning system or planning for flood defense infrastructures such as dikes and pump systems. © Int. J. of GEOMATE.
Ocean Engineering, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Indonesia; Department of Ocean Engineering, Institut Teknologi Sumatera, Indonesia
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