Water Amount
The amount of water in Niagara Falls changes at night. There is actually less water in the falls during the night. How can that be? This is due to the human factor. It’s not something that normally happens naturally. In fact, it just so happens to be that local companies are allowed to take more water from the Falls at night.
Taking More Water At Night
It was signed in the 1950s that allowed local companies to take more water at night because there are fewer tourists and even those who do come at night would not notice a difference in water quality.