Research Shows Large Catastrophic Floods on the Colorado River Happened 40 Times in the Past 2,000 Years

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The researchers found that the so-called 100-year and 500-year flood events statistically calculated from the relatively short stream gauge records have happened far more often. The 500-year flood calculated from stream gauge records was exceeded 26 times in the past 2,000 years - an average of once every 77 years. This is completely consistent with the obviously wrong conclusions that the floods in the Boulder area last September were 1 in 500-year or 1 in 1,000-year events caused by global warming.  Big Thompson Canyon has had 2 "500-year flood events" in the past 40 years. As I stated last September, it is pretty clear that the traditional flood frequency estimates based on limited stream gauge records are flawed and way off the mark. Tree ring studies dating back 1,000 years along the Colorado River have shown that the climate has gone through a regular cycle of extreme drought to extreme wet. Past cycles have shown both more extreme drought conditions and more extreme wet conditions than have happened in the past 100 years.