Detailed risk analysis

Interactive Map

Instructions: Use this map to locate the flood-risk map (right).

You can pan and zoom; click to relocate the analysis area (red).

Risk analysis is available only within the blue boundary.

   

Exceedance

We express "exceedance" (likelihood of flooding) as the expected number of floods per year. Exceedance can be less than 1. Some examples:

  • 10 = 10 expected floods per year
  • 0.1 = 10% chance of flooding in a given year
  • 0.01 = 1% chance of flooding in a given year
color flood risk exceedance (floods/year) description
frequent flooding greater than 1 more than one flood per year
high risk 0.1 - 1 worst case: yearly flood
moderate risk 0.01 - 0.1 worst case: 10-year flood
low risk less than 0.01 worst case: 100-year flood