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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] For coastal or lake flooding, a 100-year flood is generally expressed as a flood elevation or depth, and may include wave effects. For river systems ...
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 years. [ 2 ] Such maps are used in town planning , in the insurance industry, and by individuals who want to avoid moving into a home at risk of flooding or to know how to protect their property.
The Grand River went above bankfull on the night of March 24, rising slowly for the next four days. It broke the previous high-water mark by over 60 cm (2.0 ft), and was considered a once in 100 year flood. Over one-half of the population on the west side of the river was inundated. On the east bank of the river, numerous factories went underwater.
Fort Calhoun Nuclear Generating Station during flood on June 16, 2011. Lists of floods in the United States provide overviews of major floods in the United States. They are organized by time period: before 1901, from 1901 to 2000, and from 2001 to the present.
The U.S. has had a record 25 weather disasters so far in 2023, each of which caused at least $1 billion in damage — and a new NASA analysis suggests the year’s extreme weather events may be ...
The 2011 Missouri River floods was a flooding event on the Missouri River in the United States, in May and June that year. The flooding was triggered by record snowfall in the Rocky Mountains of Montana and Wyoming along with near-record spring rainfall in central and eastern Montana.
In 2015, more than 11% of built-up areas globally faced high or very high flood risk, meaning areas at risk of flooding depths of at least 50 cm (17 inches) during 1-in-100-year flooding events ...
In 1972, hundreds of Knoxvillians fled their homes during a flood that caused hundreds of thousands of dollars of damage, the News Sentinel reported Dec. 11 of that year. Many homes were flooded ...