EVALUATION OF STORAGE POTENTIAL BY NUMERICAL SIMULATION OF INUNDATION IN URBAN AREA

Abstract

 A new policy, River Basin Disaster Resilience and Sustainability by All, has been attracting attention. In this study, we evaluate the "rainwater storage potential, " which represents the maximum storage capacity of each area, in order to expand the rainwater storage function. First, the flood situation in Matsue City during the July 2006 heavy rainfall was reproduced using an inundation flow analysis. Then, the flood mitigation of the storage facility was evaluated by using the inundation analysis model that takes the storage function into account. As a result, inundation depths were reduced especially in the areas with large inundation damage, confirming the effectiveness of the storage facilities. The evaluation of the storage potential in Matsue City suggests that about 70% of the storage capacity can be applied to reduce the flood damage caused by the July 2006 heavy rainfall.