Originally posted by Sparkle Baby it's cold up there. The landmark that is constantly moving backward, due to the wearing away of the lip of the falls caused by water erosion.
Until 1905 the falls eroded 3.8 feet per year. From 1906 to 1927 it was down to 2.3 feet per year. Today, because of the International Control Dam, the Horseshoe Falls erodes at 1 foot every 10 years. The American Falls is eroding at 3-4 inches every 10 years. From April 1st to October 31st there is a water flow of at least 100,000 cubic feet per second. At night they turn it down to 50,000 cubic feet per second. In the winter it is always 50,000 cubic feet per second. The normal flow rate of the river is 212,000 cubic feet per second, so even in the tourist season at least half the water is being diverted for power generation.