It's enough to fill 2,000 Grand Canyons. We're talking 7,000–8,300 km3 of water, trapped behind concrete, messing with rivers, ecosystems, and even Earth's crust.
It's like humanity's playing a massive Jenga game with nature, pull one block and the whole system wobbles.

What happens when this tower falls?

>>511135383 (OP)
>7,000–8,300 km3 of water
The volume of the ocean is over 1.3 billion km3
People are insignificant on the planetary scale

>>511135591
The fuckhuge chinese dam slows down the spinning of the Earth though.