The California flood of 1605 has led the USGS to come up with a Multi Hazards Demonstation Project of a megastorm known as an ARkstorm which is still realistic, and can help modern California prepare for such scenario.
The United States Geological Survey has developed a hypothetical scenario, known as the "ARkStorm", that would occur should a similar event occur in modern-day California. An ARkStorm (for atmospheric river 1,000 storm) is a hypothetical but scientifically realistic "megastorm" scenario developed and published by the Multi Hazards Demonstration Project (MHDP) of the United States Geological Survey, based on historical occurrences. 
