Some time ago I heard a comment on some National Geographic or Discovery Channel program that the earth rotation is slowed down due to water trapped in dams. I did not pay attention to this at the time as it was said to be a fraction of a second.
Planning my next vacation I came across this article and this made me wonder about the effects of a major dam failing at full capacity. This dam has $180km^3$ of water and will spill over and also take out this dam having another $55km^3$, combined this is a substantial mass of water that will run into the ocean.
I am not so much interested in the immediate effects but more on the long term effects. How will this devastation affect the world economy?
What will such devastation do to the environment? Certainly many coral reefs will be destroyed by this amount of fresh water.
Will the release of these amounts of water affect the rotation of the earth?
Surely this will cause a tidal wave that will wipe out some islands in the Indian ocean, tourism will be affected.
Electrical supply to many neighboring countries will stop suddenly.