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.

Central Texas faced historic, catastrophic flooding this month, with some meteorologists calling these floods 1000-year ...

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 ...

A 500-year flood means such an event has a 1 in 500 chance, or 0.2%, of occurring in a year. Another concept scientists use is how frequently an event of a certain intensity is expected.

After 100-year rains Sunday, new flood infrastructure holds strong in Coconino County ... 1300 W. University Ave. Suite 100 Flagstaff, AZ 86001 Phone: 1-877-810-7370 Email: ...

The term 100-year flood is something of a misnomer. It's not one that happens every 100 years, but one that has a 1 in 100 chance of occurring. Moab just had a 100-year flood.

The term "100-year flood" can be confusing and misleading, scientists, local emergency officials and homeowners all agree. Experts say there's a better way to communicate about flood risk.

And if you expand that to a 30-year period, a life of most mortgages, it's a 26% chance that you will see water in that 100-year flood plain, or 1% chance area over the span of 30 years." ...

Princeton researchers have developed new maps that predict coastal flooding for every county on the Eastern and Gulf Coasts and find 100-year floods could become annual occurrences in New England; and ...

For example, if a 100-year flood occurred today in Norfolk’s 23507 ZIP code, it could affect 669 properties. This type of event has a 26% chance of occurring at least once over the life of a 30 ...

July 8 is the 20th anniversary of the historic 100-year flood in Las Vegas. It was a major flash-flooding event in 1999 that caused an estimated $20 million in damage in the valley.

This is what forecasters mean when they talk about a 100-year flood. AP FILE - Cars are submerged on a freeway flooded in the aftermath of Hurricane Harvey near downtown Houston.