re: So, was there ever a disaster plan for a situation like this?

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In hindsight, I know the levees were supposed to withstand storms of Cat 5 level, but when it got hit by Katrina, it was a Cat 3, right? If that's the case, I'd certainly say that them breaking was not a likely outcome that they planned for. But I don't know that for sure.

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It was known that the levees couldnt withstand a direct hit like Katrina was. The levee bases were much lower below MSL than initally thought and everyone feared they would break or be overtopped if a hurricane came into the lake which unfortunately is what happened. In the case of the Horizon, the bops should have stopped the kick and prevented this well from blowing out, but they didnt. So I dont think these situations are similar in that respect.