They have tried to contain it. They can coax that water to do things for a while but eventually it will do what it wants.
Been reading Mark Twain? ;o)
He said the same - back in the 1800's - when they first started trying to tame the " "Mighty Mississip."
"One who knows the Mississippi," Twain said, "will promptly aver — not aloud, but to himself — that ten thousand River Commissions, with the mines of the world at their back cannot tame that lawless stream, cannot curb it or confine it, cannot say to it, Go here, or Go there, and make it obey; cannot save a shore which it has sentenced; cannot bar its path with an obstruction which it will not tear down, dance over, and laugh at."