I agree, I have seen video and pictures of those busses, when I saw them, I thought to myself, what a friggin CRIME it was that they were unused.
We were massively unprepared for this, and I think this actually shows a vulnerability of all major urban cities to a disaster.
Keep in mind this is a larger disaster than anything, short of nuclear attack, that human beings could inflict. This is NATURE, a mighty force greater than human capability.
That said, I do wonder why the city did not even have reserves of drinking water...