This procedure makes uninhabited parts of your home resistant to flood damage when water is allowed to enter during flooding. An example of wet floodproofing is to install flood vents, creating permanent openings in the foundation walls.
This retrofit requires at least two vents on different walls. The size of the vents must be 1 square inch per square feet of enclosed floor area. For example, a 1,000 square foot house would require 7 square feet of flood vents.
The advantage of wet floodproofing are that it is less costly than other retrofits, no additional land is required and it does not affect the appearance of the house.