| Zone 2: Between 1 in 100 and 1 in 1000 annual probability of flooding in any year (0.1-1%) |
| Zone 3a: Areas betweeen 1 in a 100 and 1 in 25 annual probability of flooding in any year (1-4%) |
| 3a - Defended up to 1 in 100 (1%) |
| 3a - Defended up to 1 in 50, Flood Risk between 1 in 50 and 1 in 100 (1-2%) |
| Zone 3a(i): Developed areas with up to a 1 in 25 or greater annual probability of flooding in any year (4% or greater) |
| Zone 3b: Areas with up to a 1 in 25 or greater annual probability of flooding in any year (4% or greater) |
| Zone 1: Less than 1 in 1000 annual probability of flooding in any year |