Design of Flood Discharge with Synthetic Unit Hydrograph in Comoro Watershed, Timor Leste

Aderita Takeleb; Miguel  Antonio Ximenes; Ana  Fatima Godinho; Carla  Alexandra de Jesus da Costa; Qonaah  Rizqi Fajriani

Aderita Takeleb Department of Civil Engineering, Dili Institute of Technology, Dili, Timor-Leste
Miguel Antonio Ximenes Department of Civil Engineering, Dili Institute of Technology, Dili, Timor-Leste
Ana Fatima Godinho Department of Civil Engineering, Dili Institute of Technology, Dili, Timor-Leste
Carla Alexandra de Jesus da Costa Department of General Management, Dili Institute of Technology, Dili, Timor-Leste
Qonaah Rizqi Fajriani Department of Civil Engineering, Universitas Negeri Yogyakarta. Indonesia

Keywords: Flooding, Flood discharge, Synthetic unit Hydrograph, Nakayasu, Watershed

Abstract

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.

Downloads

Download data is not yet available.

References

Balasubramanian, A., 2005. Floods as Natural Hazards. In: University of Mysore.

Bhuyan, M.K., Kumar, S., Jena, J., Bhunya, P.K., 2015. Flood Hydrograph with Synthetic Unit Hydrograph Routing. Water Resour. Manag. 29, 5765–5782.

Boahemaa, R., Jnr, J.D., Essoun, R., Mendy, A., Manu, I., 2017. Causes of Flooding ; a Case Study of Accra Metropolis.

Chalid, A., Prasetya, B., 2020. Utilization of a pond in East Jakarta for a sustainable urban drainage system model. IOP Conf. Ser. Earth Environ. Sci. 437.

Chow, V. Te, Maidment, D.R., Mays, L.W., 1988. Applied Hydrology, Internatio. ed. McGraw-Hill Book Company.

Flores, F., 2020. POSSIBLE CAUSES OF FLOODING IN THE CITY OF CAGAYAN DE ORO , 1–4.

Kastrati, B., Bulliqi, S., Isufi, F., Humolli, F., 2014. CAUSES OF FLOODING IN KOSOVO.

Krisnayanti, D.S., Bolla, M.E., Nasjono, J.K., Wangge, M.J.M., 2019. The analysis of alpha parameter on Nakayasu Synthetic Unit Hydrograph in Timor Island watersheds. IOP Conf. Ser. Mater. Sci. Eng. 669.

Lal, M., Mishra, S.K., Pandey, A., Pandey, R.P., Meena, P.K., Chaudhary, A., Jha, R.K., Shreevastava, A.K., Kumar, Y., 2017. Evaluation of the Soil Conservation Service curve number methodology using data from agricultural plots. Hydrogeol. J. 25, 151–167.

Liu, Y., Zheng, M., Zhou, N., 2021. Analysis on impact of land use change on urban waterlogging caused by floods. E3S Web Conf. 233.

Munsaka, E., Mutasa, S., 2012. Flooding and Its Impact on Education. In: Intech. p. 13.

Nurdiyanto, N., 2019. Strategy in river flood control. J. Phys. Conf. Ser. 1375.

Pinto, D., Shrestha, S., Babel, M.S., Ninsawat, S., 2015. Delineation of groundwater potential zones in the Comoro watershed, Timor Leste using GIS, remote sensing and analytic hierarchy process (AHP) technique. Appl. Water Sci. 7, 503–519.

Red Cross of Timor Leste, 2020. Timor Leste: Floods Information bulletin, Reliefweb.

Samuels, A., 2013. Flooding. J. Plan. Environ. Law 808–809.

Soulis, K.X., United States Department of Agriculture, Lal, M., Mishra, S.K., Pandey, A., Pandey, R.P., Meena, P.K., Chaudhary, A., Jha, R.K., Shreevastava, A.K., Kumar, Y., 2017. Hydrologic Soil-Cover Complexes. Natl. Eng. Handbook, part 630 91, 151–167.

Sri Harto Br, 2000. Hidrologi; Teori, Masalah, Penyelesaian. Nafiri Offset.

Suripin, 2004. Sistem Drainase Perkotaan yang Berkelanjutan, I. ed. ANDI, Yogyakarta.

Takeleb, A.M., Sujono, J., Jayadi, R., 2018. Analysis of water availability and water demand to meet urban demand in Dili municipal, Timor Leste. In: Proceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018.

UN Timor Leste, 2021. Timor Leste:Flood.

USDA, 2007. Hydrologic Soil-Cover Complexes. Natl. Eng. Handbook, part 630 (US Dep. Agric. 91, 8–11.

Wilk, K., 2018. Hazards for buildings and structures caused by flood conditions. E3S Web Conf. 45, 1–8.

Wright, J.M., 2007. Floodplain Management: Principles and Current Practices, Chapter 2: Types of Floods and Floodplains. Floodplain Manag. Princ. Curr. Pract. 1–18.

Zain, A., Legono, D., Rahardjo, A.P., Rachmad Jayadi, 2021. Review on Co-factors Triggering Flash Flood Occurrences in Indonesian Review on Co-factors Triggering Flash Flood Occurrences in Indonesian Small Catchments. In: IOP Conf. Series: Earth and Environmental Science. p. 930.