Originally Posted by
20driver
From what I can see negligence and stupidity appear the be the likely causes. Once water starts to pipe under a spillway the collapse is typically very sudden. To destroy that sort of structure with such a breach would require serious excavation and tons of explosives. Hard to do that unnoticed.
Dams are constantly monitored and operated according to protocols. Most dams have regular , even daily, inspection of the down steam face. I very much doubt this has being happening.
"Never attribute to malice that which is adequately explained by stupidity"