How accurate is the Flood Factor rating?

[Franco Montano]

Do any investors have knowledge or experience with Flood Factor ratings on how accurate they have been? I was looking to purchase a property that is in a FEMA high risk flood zone but the house has a rating of 1 in Flood Factor. The house is located on top of a hill and hasn't had a history of flooding with the current owner. The property is located in Atlanta Georgia.

I would appreciate any tips or information on this topic.