Analyzing lead time for flood early warning system in the upstream Citarum River Aristi Ayuningsi Ode Asri, Faizal Immaddudin Wira Rohmat, Hadi Kardhana, Arno Adi Kuntoro and Mohammad Farid E3S Web Conf., 467 (2023) 02004 Published online: 20 December 2023 DOI: 10.1051/e3sconf/202346702004