Assessing pipeline vulnerability to lahar flows in Umbul Wadon, Mount Merapi, using integrated HEC-HMS and HEC-RAS modelsAlfath Zain, Sabariah Musa, Arniza Fitri, Mas Mera and M. Rizky IsmailE3S Web Conf., 677 (2025) 01003DOI: https://doi.org/10.1051/e3sconf/202567701003