In Typhoon Hagibis in 2019, a elderly welfare facility and a welfare facility of the mentally handicapped persons suffered severe flood damage by the collapse of an embankment at the 0km point on the Oppe River. Interview surveys were conducted on these social welfare facilities regarding the damage situation, emergency response, and resumption of operations after the disaster. The inundation trace surveys and flood inundation analysis were conducted to deeply understand the actual damage situation. From these results, we focus on the difference between the characteristics of the welfare facilities for the elderly and the disability persons, extract the issues, and consider the points to consider when formulating an evacuation securement plan and a business continuity plan for social welfare facilities.