Flood management analysis in the Ngasinan River, Trenggalek Regency, Indonesia Indra Nurdianyoto, N. Hermawan Cahyo, Viari Djajasinga and Jazaul Ikhsan E3S Web of Conf., 517 (2024) 04002 Published online: 15 April 2024 DOI: 10.1051/e3sconf/202451704002