A high - risk area has a 1 percent or greater annual chance of flooding and a 26 percent chance of flooding over the life of a 30 - year mortgage. (blog.narrpr.com)
The 1 - percent annual chance flood is also referred to as the base flood or 100 - year flood. (themultifamilyguy.com)
If your home is in an area labeled Zone B, X or C, it has less than a one percent annual chance of flooding, and you generally won't be required to purchase flood insurance. (valuepenguin.com)