The following terms are used to describe the 100-year floodplain.
(1) “Floodplain” means the areas subject to FEMA regulations, generally adjoining a stream or river that would be covered by floodwater of a base flood except for sheetflood areas that receive less than one foot of water per occurrence. The floodplain consists of a floodway and floodway fringe.
(2) “Floodway” means the channel of a stream or river and the adjacent overbank areas that must be reserved in order to discharge a base flood without cumulatively increasing the water surface elevation more than one-half foot.
(3) “Floodway fringe” means that portion of the floodplain outside the limits of the floodway.
The 100-year floodplain designation does not mean that a certain property will be flooded once every 100-hundred years. The 100-year floodplain designation actually means there is a one (1%) percent chance per year that a property will be flooded. In addition, a 100-year flood could take place more than once during a 100-year time frame or in consecutive years.