If you click on map at right it should get bigger:
begin partial quote from:
https://en.wikipedia.org/wiki/Great_Flood_of_1862#California
The storm is not an isolated occurrence. Geologic evidence has been found that massive floods, caused by rainfall alone, have occurred in California every 100 to 200 years.[17] The flood has been studied by the United States Geological Survey and emergency planners, who use it as an example when modelling the impact of a similar event happening in modern-day California. The official name for such an event is an "ARkStorm", and it is unofficially called "The other big one".[40][41]
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