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  2. 100-year flood - Wikipedia

    en.wikipedia.org/wiki/100-year_flood

    Mississippi River at Kaskaskia, Illinois, during the Great Flood of 1993. A 100-year flood is a flood event that has on average a 1 in 100 chance (1% probability) of being equaled or exceeded in any given year. [1] A 100-year flood is also referred to as a 1% flood. [2]

  3. Flood insurance rate map - Wikipedia

    en.wikipedia.org/wiki/Flood_Insurance_Rate_Map

    FIRMs display areas that fall within the 100-year flood boundary. Areas that fall within the boundary are called special flood hazard areas (SFHAs) and they are further divided into insurance risk zones. The term 100-year flood indicates that the area has a one-percent chance of flooding in any given year, not that a flood will occur every 100 ...

  4. What's a 100-year flood? A hydrologist explains

    www.aol.com/news/whats-100-flood-hydrologist...

    A '100-year flood' doesn't mean you'll be flood-free for the next 99 years. Win McNamee/Getty ImagesA 100-year flood, like a 100-year storm, is one so severe it has only a 1% chance of hitting in ...

  5. Return period - Wikipedia

    en.wikipedia.org/wiki/Return_period

    For example, a 10-year flood has a 1/10 = 0.1 or 10% chance of being exceeded in any one year and a 50-year flood has a 0.02 or 2% chance of being exceeded in any one year. This does not mean that a 100-year flood will happen regularly every 100 years, or only once in 100 years. Despite the connotations of the name "return period".

  6. Many Eastern KY schools sit in flood zones. Should they be ...

    www.aol.com/news/many-eastern-ky-schools-sit...

    By FEMA’s definition, a 100-year flood zone is an area near water with a 1 percent annual chance of flooding, or a 26 percent likelihood over the span of a 30-year mortgage.

  7. New flood maps show US damage rising 26% in next 30 years due ...

    www.aol.com/news/flood-maps-show-us-damage...

    Over the next three decades, the cost of flood damage is on pace to rise 26% due to climate change alone, an analysis of our new flood risk maps shows. That’s only part of the risk.

  8. National Flood Insurance Program - Wikipedia

    en.wikipedia.org/wiki/National_Flood_Insurance...

    Theoretically a 100-year flood has a 1 percent chance (1/100 = 0.01 or 1 percent) of occurring in any given year and a 500-year flood has as a 0.2 percent chance (1/500 = 0.002 or 0.2 percent) of occurring in any given year. [12] However, these expected flood elevations actually occur more or less often than expected. [13]

  9. 25 years later: The Great Flood of 1993 remains worst river ...

    www.aol.com/weather/25-years-later-great-flood...

    In some areas, the multi-month rainfall was a 100-year or 1000-year flood. I think something that's both profound and underappreciated: 1993 is STILL the most costly US flood*.