Prof. Ognjen Bonacci is professor emeritus at the University of Split, faculty of civil engineering, architecture and geodesy, Croatia. He earned his PhD (1976), msc (1971), and diploma in civil engineering (1965) from the University of Zagreb. His research focuses on engineering hydrology, karst hydrology, ecohydrology, hydrometry, sediment transport, and water resources management. Prof. Bonacci served as chairperson of the Croatian national committee for the UNESCO international hydrological programme (IHP) and the world meteorological organization’s operational hydrological programme (2000–2010), and as chairperson (2004–2006) and vice-chairperson (2007–2008) of the IHP-UNESCO bureau. He is a member of the advisory board of the UNESCO-IHE Institute for water education (Delft) and the academic committee of the UNESCO international research center on karst (IRCK, Guilin, China). Author of five books and over 700 scientific papers, including more than 90 in leading international journals, he has presented at over 170 conferences worldwide. Prof. Bonacci has reviewed more than 400 papers for top scientific journals and received multiple national awards, including the Croatian national science award (1988, 2011). His work has been cited over 5,000 times in Scopus and Web of Science.