The Coming Megafloods

TitleThe Coming Megafloods
Publication TypeJournal Article
Year of Publication2013
AuthorsDettinger MD, Ingram BL
JournalScientific American
Date Published2013/01
Type of ArticleArticle
ISBN Number0036-8733
Accession NumberWOS:000317106200039

Geologic evidence shows that truly massive floods, caused by rainfall alone, have occurred in California about every 200 years.The most recent was in 1861, and it bankrupted the state. Such floods were most likely caused by atmospheric rivers: narrow bands of water vapor about a mile above the ocean that extend for thousands of miles. Much smaller forms of these rivers regularly hit California, as well as the western coasts of other countries. Scientists who created a simulated megastorm, called ARkStorm, that was patterned after the 1861 flood but was less severe, found that such a torrent could force more than a million people to evacuate and causeĀ $400 billion in losses if it happened in California today. Forecasters are getting better at predicting the arrival of atmospheric rivers, which will improve warnings about flooding from the common storms and about the potential for catastrophe from a megastorm.

Short TitleSci.Am.
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