Hydrological and meteorological (“hydromet”) hazards—such as storms, fl oods, droughts, and heat and cold waves—are responsible for the greatest proportion of losses from adverse natural events globally, causing nearly 80% of disasters and over 50% of disaster-related deaths from 1980 and 2011. A lack of technical capacity and delivery capability needed to provide eff ective service are key challenges many developing countries face. However, well-prepared and well-resourced hydromet services can help in minimizing the disruptions caused by natural hazards, by providing warning to governments and communities in advance of events. Additionally, resources such as fl ood hazard maps can help guide reconstruction eff orts after disaster strikes. Japan’s experience in road geohazard risk management by addressing the challenges in an integrated manner ensuring institutional coordination, and applying structural and non-structural measures, off ers key lessons for the developing countries.