The Prediction of Debris Flow Based on Eruption and Rainfall Event for River Infrastructure Mitigation: Study Case Opak River, Sleman RegencyHadiranti, Priyo Sembodo, Agung Wiyono Hadi Soeharno, Adi Prasetyo, Eka Oktariyanto Nugroho and Angga Eko PutrantoE3S Web Conf., 500 (2024) 02015DOI: https://doi.org/10.1051/e3sconf/202450002015