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SAAD evaluated and resolved appeals submitted by eleven of the affected communities, requiring close coordination with Los Angeles District and FEMA. Levee failure scenarios were evaluated to arrive at an approach that would be most reasonable for floodplain management purposes within these communities. The levees along these two flooding sources do not provide 100-year flood protection, according to FEMA’s guidelines and specifications. The inundation reflected the existing conditions of “no flood control project” in the Los Angeles River basin. The draft Flood Study of Los Angeles County and Incorporated Areas, California was analyzed and evaluated by SAAD Consultants senior staff to map the flood risk along the Los Angeles River and Rio Honda for Los Angeles County and fifteen communities. Army Corps of Engineers, Los Angeles District prepared a comprehensive flood control study in the Los Angeles River basin. “The consequence is will come in shorter and more intense bursts.”īusinesses and local governments can minimize the long-term impacts of such a disaster, Rose said, by creating emergency plans, increasing inventories of critical materials, backing up information systems, and diversifying supply chains and routes.” “Storms form based on how warm the oceans are and how the jet stream changes,” Bernstein said. “Climate change affects how the whole ecosystem works,” said Mark Bernstein, managing director of The USC Energy Institute. The sea level is rising as oceans warm and glaciers melt, which can create higher storm surges and more disastrous flooding in coastal areas. It was the wettest December in downtown Los Angeles in more than a century.Ĭlimate scientists said global warming is a major factor behind the increasingly destructive power of hurricanes and other storms. Rose called the severe storm scenario “much more imaginable” after Los Angeles was hit with 9.42 inches of rain in December. Rose estimated the ARkStorm would cause the state’s unemployment rate to jump six percentage points in the first year, a further blow to the California economy that currently has one of the highest unemployment rates in the nation at 12.4 percent. disrupt lifelines such as power, water and sewers that would take weeks or months to repair.set off hundreds of landslides that would damage roads, highways and homes.create hurricane-force winds of up to 125 miles per hour in some areas and flood thousands of square miles of urban and agricultural land to depths of 10 to 20 feet.The megastorm likely would require the evacuation of 1.5 million people.Īccording to the USGS, the ARkStorm would: The ARkStorm areas include Orange County, Los Angeles County, San Diego and the San Francisco Bay area.

California was left bankrupt after the storms wiped out nearly a third of the state’s taxable land, according to the USGS. But those storms were no freak event, said USGS scientists, who called the ARkStorm model “plausible, perhaps inevitable.” The storms lasted for 45 days, forming lakes in the Mojave Desert and the Los Angeles Basin. West Coast storms that devastated California in 1861-62. Geological Survey (USGS) scientists termed “ARkStorm - or “atmospheric river storm” - is patterned after the U.S. That number would make the severe storm scenario “the costliest disaster in the history of the United States”, Rose said, “more than six times greater than the 2001 World Trade Center attacks and Hurricane Katrina, which each caused $100 billion in business interruption.” [Photograph above right: K Street, Sacramento, CA in early 1862 following an ARkStorm.} Rose, a professor with the USC School of Policy, Planning, and Development, also is the coordinator for economics at the Center for Risk and Economic Analysis of Terrorism Events (CREATE) at USC. Researchers estimate the total property damage and business interruption costs of the massive rainstorm would be nearly $1 trillion USC research professor Adam Rose calculated that the lost production of goods and services alone would be $627 billion of the total over five years. “A hurricane-like superstorm expected to hit California once every 200 years would cause devastation to the state’s businesses unheard of even in the Great Recession, a USC economist warns. California Superstorm Would Be Costliest US Disaster Food and Water/Developing a Survival Food List.ġ. If you were not living in California, the result will be seen developing into a national economic depression. When this scenario occurs, if you’re living in central California, you will be put in a survival situation.