;In the past, there were about 3-4 typhoons to hit Taiwan per year on average. Typhoon events were often accompanied by heavy rain and flooding. Facing of such flooding, the chance of people’s property exposed to risks was also significant increasing. In this study, the catastrophe risk assessment model is used to assess the loss caused by the various flooding events. The catastrophe risk assessment model includes five different modules, which are stochastic event module, hazard module, exposure module, vulnerability module and financial module. To assess the loss caused by flooding, this study will focus on exposure module and vulnerability module. Considered the residential houses and industrial, commercial, service industries in Zhong Gang river and its nearby basins as the targets of this study, three steps were taken to conduct this investigation. First, WASH123D model was employed to simulate and delineate flooding due to various return periods of precipitation. Second, relevant literatures and the information of risk exposure were collected. Finally the annual average loss and loss exceeding probability were calculated.
