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No one starts off with a 1000-yr plan that says "we're going to have 10 million people living here 950 years from today, so we should plan our village with that in mind."
Cairo was there many hundreds of years before the dam was built.
I don't follow your logic on that. The Nile valley has been flooding regularly for thousands of years. How did "the entirety" of Cairo suddenly end up in the flood plain, requiring the construction of a dam?No one did, which is why Aswan had to be built to avoid moving or rebuilding the entirety of the largest city in the country.
Statistically speaking, it's only limited by the length of time for a single event. However, since we have only a couple hundred years' worth of actual data to work with, I would think definitions would probably need to adjusted....so, how many 1000 year events can you get in a week? ponder