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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. FIRMs are ...
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.
Considered a 100-year flood, [2] it was the worst flood in recorded history on nearly every major stream and river in coastal Northern California and one of the worst to affect the Willamette River in Oregon. It also affected parts of southwest Washington, Idaho, and Nevada. [1] [3]
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 ...
The risk of flooding at a level that used to constitute a 100-year flood, meaning there was a 1% chance of it occurring in any year, had increased by 33% between the 1980s and 2010s. [9] In addition to logging and development, climate change plays a role in increasing flood risk by delivering more precipitation to upstream areas. [ 10 ]
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*. The margin is ...
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]