Design of Flood Discharge with Synthetic Unit Hydrograph in Comoro Watershed, Timor Leste
Flooding events has periodically occurred in rivers and will form the flooding area. Timor Leste has two times experienced of heavy flooding and natural disaster in 2020 and 2021 respectively. The aim of this study is to determine and analyze the design flood discharge for 5, 10. 25. 50, 100 and 500 years of return periods using synthetic unit hydrograph Nakayasu. The design flood discharge will determine in 4 rivers in Dili that consist in Comoro Watershed. The hydrology analyzes of design flood discharge in four rivers has included rainfall analyze, abstraction or infiltration of soil in terms of land use, rainfall-runoff model using synthetic unit hydrograph, and baseflow analysis. Based on analyze of design flood discharge in each return periods, the biggest flood discharge is occurring in Comoro River. The smallest design flood discharge is in Kuluhun/Lahane River. For Maloa and Becora/Taibesi River have moderate value of design flooding discharge. The difference of flooding discharge is due to the difference of geometric characteristic or parameter of each river. The value of design flood discharge is useful in planning and designing the river construction to prevent the flooding. The Government should use this information and technical data to strengthening the early warning system and mitigation system in risk area of flooding.
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