In the summer of 2006, a severe drought reduced the amount of water in the Iguazu River, reducing the amount of water flowing through the falls to 300 cubic meters per second by early December. This was unusual, as dry periods there usually last for several weeks.
There have already been cases of the waterfall “drying up.” This happened in 1934 and again in 1978, when during a persistent drought the current of the river dropped so much that not a single drop of water flowed over the edge of the cliff for 28 days.
The greatest amount of water flows over the waterfall between December and February. And in sunny weather, rainbows often form over the waterfall.
