Rainfall-Run Off Simulation and Associated Extent of Flooding in The South of Bandung, Indonesia

Abstract

Flood in Bandung Regency become more severe in the last decade. In the early 2016, recent flood was larger than years before. It is thought that land cover change seems to be the main factor of the flood instead of climate change. This research aims at investigating the correlation between river flow discharge -which are controlled by rainfall and land cover- and flooding extents. Here, flow discharge is computed by utilizing STREAM (Spatial Tools for River Basins and Environment and Analysis of Management Options). Land cover, rainfall, and air temperature are the main input for the model. The computation domain covers the entire Upper Citarum Catchment. Evaluation of discharge is focused in Dayeuhkolot, as inundated areas recorded in 1994, 1997, 2001, and 2005. We find that there is meaningful correlation between flow discharge computed by our model and inundation area. The result of this study needs to be explored for further projected flood event as a result of climate and land cover change. In order to construct an appropriate planning and protection measures, an associated flooding area from the magnitude of flow discharge shall be taken into consideration. Flow discharge and inundation area can be projected by extreme value analysis.

Keywords: hydrological model, discharge, inundation

Rainfall-Run Off Simulation and Associated Extent of Flooding in The South of Bandung, Indonesia

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