2003 Volume 9 Pages 305-310
In determining standards for disaster mitigation facilities for various disaster risks such as flood risk, the expected reduction in damage that between the with-investment case and the without-investment case is normally used as an index of the benefits of investing. This index, however, has been criticized for being inappropriate for investments in disaster and accident prevention facilities, especially for risks of low frequency and a high degree of uncertainty, but with the possibility of catastrophic damage, as written in the manual of flood control economy investigation. Therefore, to contribute to these discussions, this study measured the risk evaluation characteristics of decision-makers on frequency and damage of the flood risk, based on actual flood control level decided in Japanese rivers.
