In type "V" and "Coastal A" flood zones, enclosed areas below flood levels may be used for minimal storage, parking, and building access. However, these areas must have breakaway walls and flood vents.
The purpose of breakaway walls is to provide a means for floodwaters to flow through and around a structure during a flood event. These walls are designed to break or collapse under the force of floodwaters, allowing the water to pass through without causing significant damage to the main structure. Breakaway walls help to reduce the impact of flood forces on buildings, minimize structural damage, and prevent the accumulation of hydrostatic pressure that could lead to structural failure. By incorporating breakaway walls, buildings in flood-prone areas can be better protected and reduce the risk of costly repairs or reconstruction after a flood.
