[jlmorton]

That's a good point. But I'm not sure it's quite as simple as you make it sound to construct a dam with 2.5 million cubic meters of concrete, divert all of the water for a major drainage basin into the newly-created reservoir, and flood 500 square kilometers of land to a depth of 100 meters, and then just move on.

[corobo]

Generally you don’t do it by yourself