Author(s): Denik Sri Krisnayanti; Vredrik Bainlawuil; Ralno Robson Klau

Linked Author(s): Denik Sri Krisnayanti

Keywords: Climate change; Curve number; Cendana method

Abstract: East Nusa Tenggara (NTT) is one of Indonesia's provinces most susceptible to flooding, largely due to its physical characteristics that impede rainwater absorption and lead to significant surface drainage. Within this province, the Kupang District is particularly vulnerable. From February 22-27,2022, the Regional Disaster Response Agency reported 10 flooding incidents in Kupang District, impacting various villages in East Kupang. This study aims to evaluate the flood vulnerability levels and the distribution of affected areas in the eastern part of Kupang District, focusing on the Tuapukan and Bokong river basins. The research employs the SCS Curve Number method, integrating morphometric data, annual maximum daily rainfall data, and hydrological parameters, which include river length, basin shape, drainage density, river slope, Nakayasu HSS values, channel roughness, watershed flow area, curve number (CN) values, and land cover. Findings indicate that flood vulnerability in East Kupang District is classified as “very high” and “high, ” affecting 13 villages: Oefafi, Tanah Putih, Tuapukan, Merdeka, Manusak, Oesao, Pukdale, Babau, Tuatuka, Naibonat, Nunkurus, and Oelatimo. A total of 1,537.28 hectares are categorized as having “very high flood vulnerability, ” with Oelatimo Village experiencing the most significant impact at 715.04 hectares.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P1792-cd

Year: 2025