Proposal of a method for assessing combined flood risk reduction effect by hazard control measures and exposure reduction measures based on limited data

Abstract

This article verifies the applicability of an assessment method on flood risk reduction, combining and assessing hazard control measures and exposure reduction measures together. The method develops collated flood risk curves and uses limited data, so it is an approach which can be readily applied in developing countries, where an understanding of flood risk reduction measures are become increasingly important. The method was proposed as a result of studies conducted by the National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and Tourism, Japan. When applying the method to a river improvement and relocation scheme with land mounding in Mindanao, the Philippines, the advantages and limitations of the method are considered.

Novel framework for assessing long‐term flood risk management pathways focusing on river channel improvement and amenity policies

“…Flooding is one of the most hazardous natural disasters worldwide. Historically, an increase in the population and property along river lines, with continuous embankments, increases the vulnerability to catastrophic flooding (Itagaki et al, 2021; Nakamura & Oki, 2018). Furthermore, climate change is also expected to exacerbate flood risk; hence, more flood mitigation measures are required.…”

“…However, it is not practical to rely exclusively on structural measures such as river channel improvements, dam construction, and/or retention ponds (Tollan, 2002). As already suggested by several studies, nonstructural alternatives should be combined for adaptation (Barraque, 2017;Itagaki et al, 2021).…”