Despite its strange appearance, there appears to be a simple explanation for the gaping hole.
Assistant lake manager BJ Parkey told Business Insider that the vortex had been created by draining some of the water from the reservoir.
'Just like in your house when you fill a bathtub full of water and [open] the drain, it will develop a vortex or whirlpool,' he said.
The water flow creates a cyclone shape, rather like a tornado, with a wider opening at the top tapering off to a narrow funnel.
The US Army Corps claims the vortex is 'eight feet in diameter and capable of sucking in a full-sized boat'
Credit to dailymail.co.uk
http://www.dailymail.co.uk/sciencetech/article-3139365/A-giant-VORTEX-appears-Lake-Texoma-big-swallow-boat.html
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