Flood Observations in Indonesian Regions to Support the Development of Synthetic Unit Hydrograph Based on Watershed Characteristics

Abdul Ghoni Majdi, Suhardjono, Lily Montarcih Limantara, Ussy Andawayanti

Abstract

This study intends to analyze the observed floods in some Indonesian areas to support the model development of synthetic unit hydrographs based on watershed characteristics. By using observed rainfall data, river discharge, and watershed morphology characteristics, this study also intends to understand the pattern and frequency of flood events in some Indonesian areas. The methodology consists of obtaining the parameter value of the watershed characteristic from the topography map and Digital Elevation Model (DEM) map, rather than using the Collins method to analyze the observed unit hydrograph due to the discharge hydrograph. Floods are natural disasters that often occur in Indonesia and have a significant impact on human life, the economy, and the environment. The geographical conditions and tropical climate in Indonesia make this country vulnerable to high rainfall and other natural phenomena that cause floods. The research results are expected to contribute more accurately to the development of the synthetic unit hydrograph model in accordance with the geographic conditions of Indonesia. Therefore, it can be used as an assistant tool in design and flood disaster mitigation in the future, the results show that the influenced area of rainfall (Automatic Water Rainfall Recorder) in Jawa Timur Province and Nusa Tenggara Barat province indicate the significant effect, however there is relatively small influence in Yogyakarta. In addition, the results show that the watershed shape significantly influences the duration of the time to peak and flood peak discharge.

 

Keywords: observed flood, observed unit hydrograph, Collins method

 

https://doi.org/10.55463/issn.1674-2974.51.10.5


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