Get a copy of What If? 2 and Randall’s other books at: https://xkcd.com/booksMore serious answers to absurd questions at: https://what-if.xkcd.com/This quest...
Also that only 1/3 of the water flows over the falls. The rest is diverted off to make electricity.
Wouldn’t we also be under enough pressure to begin fusing some of that hydrogen into helium at that point?
And yet it would still leave the edges of bird shit on my car