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association with Niagara Falls
...The larger division, adjoining the left, or Canadian, bank, is Horseshoe Falls; its height is 185 feet (56 metres), and the length of its curving crest line is about 2,200 feet (670 metres). The American Falls, adjoining the right bank, are 190 feet (58 metres) high and 1,060 feet (320 metres) across.
recession in rivers
By way of comparison, the average recession rate for the American Falls, which occur downstream and to one side of Horseshoe Falls because of branching by the Niagara River, is only 0.08 metre per year. And, in a comparable vein, upstream migration of the Gullfoss in Iceland during the last 10,000 years is estimated to have occurred at an average recession rate of 0.25 metre per year. This is,...