And for next time, consider prohibiting new single story homes.
Require that all new construction be of at least two stories, and of substantial construction.
When a structure is designed as a home for two families, require that it be divided such that each family has part of the upper floor.
Old folks homes, nursing homes and the like should be on at least two floors and have ramped access from floor to floor to facilitate moving everyone to the upper floor.

In very low lying areas, where even an upper floor would be vulnerable, prohibit new construction.

For those living in EXISTING vulnerable homes, encourage the purchase of a small and unsinkable boat, perhaps by making purchase of same tax deductible.