Geographers/Geologists: Waterfall flow per second?

I was reading the wikipedia page on Tahquamenon Falls and it states that

.

But…there is a lower Tahquamenon Falls as well. Shouldn’t that have at least the same volume per second since it’s lower on the same stream?

I can understand it if waterfall volume were measured as the average amount of water that is in the waterfall at any given time. But it’s not. It’s invariably given as flow per second, but the fact that the Wiki page only distinguishes the upper falls makes me think I might have that wrong (or, alternatively, that the Wiki page was poorly written.)

Related question: if waterfall flow per second is indeed just a measure of the flow of the stream itself, is there a listing of waterfalls by average volume contained in the waterfall at any one time? Because the grandeur/immenseness of a waterfall is, to me, some product of both its height and the average volume of the flow of its stream.

I suppose it’s possible that the river forks somewhere before the lower falls, diverting some of the flow. And in principle, if it ran through a particularly arid region, you could lose some to evaporation in between, though that seems implausible in the eastern US. Other than that, though, you’re right, the lower falls should have at least as much flow as the upper.

The river splits in two at the lower falls, so the lower falls are essentially two separate series of waterfalls separated by an island.

You’re right, I’m surprised I didn’t think of that. The picture was in my link and everything.

I still think volume per second is a pretty lame measure of the size of a waterfall* since by that method the former Saint Anthony Falls would be one of the largest falls in the US. Although I think that as a rough measure I could simply multiply the height by the volume of a falls to give a measure of “grandeur”. (But of course the question would remain of what to do about split falls, and non-completely-plunge style falls of all shapes.)

*not saying anyone here said that.