People rightly mentioning how much trouble and how they’re already dragging compensate for it, but there’s something more important missing.
Whats the dam for? If it’s for generating electricity, that new hole in the middle is useless, because it contains less energy and even if it still has some, will not reach the intake.
Similarly with water reservoirs. The intake is set a level above ground to get fresh water, not mud. If you ever got such a low level that you need to get water below ground level, this is going to be very expensive to pump out with specialty pumps. And will be mostly mud anyway.
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