How fast does water fall over Niagara Falls?
The average flow rate of water over the lip of Niagara Falls is 202,000 cubic feet per second or 5,720 meters cubed per second. This rate increases in wet seasons while tapering in drier or colder seasons. Speed wise, in easier to relate terms, the water is moving over the falls at 32 kilometers per hour, or 20 miles per hour.