A flood plain is the part of the land where water collects, pools and flows during the course of natural events. Such areas are classified as Special Flood Hazard Areas or SFHAs and are located in a 100-year flood plain. The term "100-year flood" is a little confusing. It is the flood elevation that has a 1 percent chance of being equaled or exceeded each year; it is not the flood that will occur once every 100 years. The likelihood of a flood occurring within a 100-year stretch of time is very high, but there's no way to predict when the next flood will occur or the one after that. The redrawn maps that indicate the floodplain as a "high-risk" area are officially classified as AE or A zones. Low to moderate risk areas will be designated as shaded X zones (500 year) and X on the remainder of the locality on the new maps.