It goes down no?
In: Earth Science
Simply put, the water cycle. Water evaporates, is condensed into clouds and falls as rain. Fortunately for the falls the jetstream air current flows over the Great Lakes picking up all that evaporated water and bringing it up towards the areas that feed the rivers that feed the falls. This area is known as a watershed and it is hundreds of thousands of square kilometers big. All the tons of rain that falls in that watershed all eventually flows over the falls.
The rivers are also constantly fed by groundwater. All the rain that got absorbed into the soil sinks down and flows underground. Sometimes it reaches a point where the weight of the earth pushed it back up through the earth creating a spring. That spring will feed a wetland or stream that will flow to the falls. In the end it is still just every drop of rain that ever falls in that watershed eventually making it over the falls.
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