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Studies of tree rings, sediment and other natural evidence have documented multiple extreme droughts in the southwestern U.S. over the last 1,000+ years, including several which lasted more than twenty years—that’s FIVE TIMES longer than the relatively puny 4-year drought that hit California and other parts of the Desert Southwest in 2012-15.
Twenty years is a long time, but some past droughts in what is now the southwestern U.S. lasted even longer. Much longer.
One that began in the year 850 AD crawled on for a mind-boggling 240 years, and that megadrought occurred more than a thousand years before the climate fear industry dreamed up the man-made global warming theory in the early 1980s. According to the British Broadcasting Corporation (BBC), the drought of 850 was so severe that it led to the demise of an entire civilization—the Mayan Empire. And that drought wasn’t alone. Fifty years before it began, another megadrought, one which lasted 180 years, was just winding down.
With that bit of climate history in mind, here’s my question for Professor Ault: What caused those mega-droughts?
The 2012-16 drought was no surprise to older Californians, who should have remembered some of the nine multiyear droughts that afflicted California since 1900. They might also have remembered the floods that ended most of those droughts.
At this drought’s worst, at the end of 2014, Oroville Lake was at 26% of capacity, but the water level rose during heavy winter rains in 2015. On Feb. 10, two years ago, it was at 45%, and a year ago, it was at 47%.
Last weekend, after weeks of heavy rain, the lake was at 100% of its design capacity, dangerously close to flowing over the top of the dam, threatening erosion that could endanger the dam and the people downstream.
The dam operators had to lower the water level by opening a concrete spillway to such a large flow that part of the spillway collapsed into a giant pothole about the size of a football field.