The Brief. A "100-year flood" means a 1% chance of that level of flooding happening each year. Houston saw three 500-year flood events within three years from 2015 to 2017, including Hurricane Harvey.

A "100-year flood" means a 1% chance of that level of flooding happening each year. Houston saw three 500-year flood events within three years from 2015 to 2017, including Hurricane Harvey ...

The Brief. A "100-year flood" means a 1% chance of that level of flooding happening each year. Houston saw three 500-year flood events within three years from 2015 to 2017, including Hurricane Harvey.

The Brief. A "100-year flood" means a 1% chance of that level of flooding happening each year. Houston saw three 500-year flood events within three years from 2015 to 2017, including Hurricane Harvey.

The term "100-year flood" is often misunderstood—many believe it means a flood that happens once every 100 years, but that’s not how probability works. Instead, it refers to a flood that has a ...

If you live in a 1-percent AEP (100-year) flood zone, writes USGS, the odds of being flooded at least once over a 30-year mortgage are 26%. That's about a 1 in 4 chance.

Meteorologists use phrases like “the “100-year flood” to describe severe weather conditions. There’s a misconception that such a term indicates that a high level of flooding only happens ...

On 28 February 2022, the NSW northern rivers city of Lismore recorded something between a one-in-100,000-year flood and a one-in-500-year flood level, as the river catchment rose to 14.4m.

A key point is that a 100-year flood does not mean it will flood every 100 years, but rather there is a one percent chance of that level of flood happening each year.