If you have a property that has a high flood risk, you will probably need to get FEMA's elevation certificate for your property. Once you have this, you can buy flood insurance for your property. The elevation certificate notes how your property's elevation is compared to the base flood elevation as seen on a flood map. If a structure sits at the base flood elevation, it is considered to have a 1% chance of flooding annually. Comparing your property's lowest point of elevation to the base flood elevation assists in determining the flood risk and, consequently, the amount you'll pay for a flood insurance policy.