what percentage of the worlds freshwater flows over niagara falls?

Answer 1

According to wikipedia:

Niagara Falls has a flow of 110,000 m3/min (average)
Victoria falls in Africa 546,00 m3/min
Iguazu in Brazil 750,000 m3/min

As you can see this represent 7.8 % of total water just comparing the big water falls. This calculation is by no mean accurate and this number can only go smaller. The Mississippi river has not been considered nor the Colorado river, no other important rivers in the world, nor the water stored in lakes, nor the ground water.
By far the Amazon river is the largest current reserve of fresh water in the world. But Antarctica's glaciers are by far the biggest reserves of fresh water of the future.

Answer 2

This question has an inconsistency.
The world's fresh water is measured by volume (gallons, cubic feet, cubic miles, or whatever.
The water flowing over Niagara Falls is measured as a rate of flow, meaning volume per unit time (gallons per second, cubit feet per hour, or whatever).

The question could be revised to be answerable, for example:
If we consider the amount of water that flows over Niagara Falls in the course of a year, what fraction of the world's total fresh water would it represent?
-or-
How long would it take for all of the world's fresh water to flow over Niagara Falls (at the rate water currently flows over the Falls)?
-or- (and I think this is the most meaningful version)
Water is continually leaving the oceans through evaporation and re-entering the oceans via the world's rivers, so that the amount of ocean water is approximately constant. Given the rate at which river water is entering the oceans, what percentage of the water flowing into the oceans is passing over Niagara Falls? (Incidentally, this is the question that Scientist 13905 is answering.)

Incidentally, if you look at the original question in a different way, it can be argued that ALL of the world's freshwater eventually flows over Niagara Falls ... as well as all of the world's sea water. In other words, if you could stand at Niagara Falls and wait long enough, every molecule of water on earth would eventually pass over the falls and go past you (and most of the molecules would go over the falls many, many times before the last molecule finally went by).

Answer 3

According to the Buffalo Niagara River Keepers and the Niagara Falls Tourist Bureau:

One fifth of all the fresh water in the world lies in the four Upper Great Lakes-Michigan, Huron, Superior and Erie. All the outflow empties into the Niagara river and eventually cascades over
the falls.

Therefore the answer is 20%.

Answer 4

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Answer 5

100%
water in any part of the world will at some stage evaporate and migrate as a cloud around the earth (and descend as rain).
if you wait long enough any single water molecule will flow over niagara.

Answer 6

23% but 8% evapourates.

Answer 7

barely enough to bother mentioning really

Answer 8

not even .01%