‘Crop circles’ on canal ice no mystery, NCC says

Article Link: https://www.cbc.ca/news/canada/ottawa/canal-ncc-circles-1.5860959

If you’ve noticed strange circular shapes on the ice surface of the Rideau Canal lately, fear not: they don’t portend some alien takeover, but they just might signal a different kind of invasion. According to the National Capital Commission (NCC), the symmetrical patterns that have reminded some curious onlookers of crop circles are really part of the preparation for the coming skating season. “This is a result of this past weekend’s flooding operations,” Bruce Devine, the NCC’s senior manager of the skateway, reassured concerned citizens. The strange patterns are formed when crews drill holes in the ice, then pump water from underneath to thicken the frozen surface.