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| | Help | World Waterfall Database: World's Tallest Waterfalls |
 | | Waterfalls of a Fan form occur when the breadth of the water in the waterfall increases during it's decent, causing the base of the falls to appear much wider than the top of the falls. |
 | | Low volume waterfalls, or waterfalls with a shallow slope, on the other hand, have a lower rating, because they don't have as much force. |
 | | This system rewards high-volume waterfalls, and waterfalls with a shallower slope, over more vertical waterfalls (because there is more square acreage to low-gradient waterfalls, and hence more volume in the waterfall), and is best used to compare waterfalls based on volume, rather than height or size. |
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