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www.myfloodstatus.com/resources/what-does-500-year-flood-mean

The 500-year flood zone is used to designate base floodplains of lesser hazards, such as areas protected by levees from 100 year flood, or shallow flooding areas with average depths of less than one foot or drainage areas less than 1 square mile. Common Misconceptions about the 500-year flood.

efotg.sc.egov.usda.gov/references/public/NM/FEMA_FLD_HAZ_guide.pdf

, area with a 0.2% (or 1 in 500 chance) annual chance of flooding. This zone is also used to designate base floodplains of lesser hazards, such as areas protected by levees from 100-year flood, or shallow flooding areas with average depths of less than one foot or drainage areas less than 1 square mile.

abcnews.go.com/US/thousands-evacuate-500-year-flood-destroys-dams-michigan/...

A "500-year flood" means there's a 0.002% chance -- 1 in 500 -- of it occurring in a given year, according to the United States Geological Survey. A view of the flooded area near the Sanford Dam ...

www.vox.com/science-and-health/2017/8/28/16211392/100-500-year-flood-meaning

A 500-year flood is based on the same principle: Experts estimate that in any given year, there’s a 1-in-500 (0.2 percent) chance a flood this bad will strike a particular area.

en.wikipedia.org/wiki/100-year_flood

A 100-year flood is a flood event that has a 1 in 100 chance (1% probability) of being equaled or exceeded in any given year.. The 100-year flood is also referred to as the 1% flood, since its annual exceedance probability is 1%. For coastal or lake flooding, the 100-year flood is generally expressed as a flood elevation or depth, and may include wave effects.

www.ajc.com/news/national/louisiana-flooding-what-500-year-flood-and-why...

The 500-year flood” is equal to an AEP of 0.2 percent, or a 1-in-500 chance an area will see a repeat of flooding at a certain level. In some areas of Louisiana, the flooding is being classified ...

www.usgs.gov/special-topic/water-science-school/science/floods-and-recurrence...

The amount of water corresponding to a 100-year flood, a 500-year flood, or a 1,000-year flood is known as a "flood quantile". For instance, on a given river, the flood quantile corresponding to the 50-year flood might be 10,000 cubic feet per second (cfs) and the flood quantile corresponding to the 100-year flood might be 15,000 cfs. The...

www.massivecert.com/blog/fema-100-year-flood-zone-explained

The 50-year flood zone gives you a 45% chance of being flooded; The 100-year flood zone gives you a 26% chance of being flooded; The 500-year flood zone gives you a 6% chance of being flooded When you look at the 100-year flood zone that way, you have a 1 in 4 chance of experiencing flood damage during your 30-year mortgage.

www.fema.gov/flood-map

Flood mapping is an important part of the National Flood Insurance Program (NFIP), as it is the basis of the NFIP regulations and flood insurance requirements. FEMA's flood mapping program is called Risk Mapping, Assessment, and Planning, or Risk MAP. FEMA maintains and updates data through flood maps and risk assessments.

www.wnem.com/weather/what-does-a-500-year-flood-mean/article_5c14b066-9b6e-11...

The true scientific meaning of a 500-year flood means a flood, at this magnitude, has a 1 in 500 chance of occurring in a given year.