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<br /> Hazard Mitigation Plan | 2022 <br />Flood Hazards <br />- 71 - <br /> <br />Flood Hazards <br />Hazard Definition <br />A floodplain is a land area adjacent to a river, stream, lake, estuary, or other water body that is <br />subject to flooding. This area, if left undisturbed, acts to store excess flood water. The floodplain <br />is made up of two sections: the floodway and the flood fringe. The 100-year flooding event is the <br />flood having a one percent chance of being equaled or exceeded in magnitude in any given year. <br />Contrary to popular belief, it is not a flood occurring once every 100 years. The 100-year <br />floodplain is the area adjoining a river, stream, or watercourse covered by water in the event of a <br />100-year flood. Schematic: Floodplain and Floodway shows the relationship of the floodplain and <br />the floodway. <br /> <br />Figure: Floodplain and Floodway <br />(Source: FEMA How-To-Guide Assessing Hazards) <br /> <br />Types of Flooding <br />Two types of flooding primarily affect the region: slow-rise or flash flooding. Slow-rise floods may <br />be preceded by a warning period of hours or days. Evacuation and sandbagging for slow-rise <br />floods have often effectively lessened flood related damage. Conversely, flash floods are most <br />difficult to prepare for, due to extremely limited, if any, advance warning and preparation time. <br /> <br /> <br />