What Does A 100 Or 1000-Year Flood Actually Mean?

Just unbelievable. That is all that I can say about the unprecedented and historic flooding in South Carolina. This flood situation was predicted by meteorologists days in advance, but I don’t think people and decision makers could fully grasp the magnitude of the threat potential. Hurricane Joaquin’s future track dominated the headlines while many in my profession were begging the media to stay focused on the rainfall-flood threat that was going to emerge irrespective of the hurricane. Lee Grenci discusses the multiple factors linked to why this 1000-Year flood event happened, and I offered some discussion in Forbes prior to the event on the possible connections to a “hybrid” Atmospheric River.  However, as I watch the media and social media, it is apparent to me that many people still do not understand the concept of what 100- or 1000-Year flood means. Many people literally assume it means this event “can only” happen every 1000 years (in the case of a 1000-year event).

from Forbes – Tech http://ift.tt/1VASt4M
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