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See A city to last ten million years: Construction for background.

Third question on Forevertown:

What are the key issues for maintaining the physical infrastructure of a low-tech city over ten million years?

Also related: A city to last ten million years: Location

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    $\begingroup$ See this answer $\endgroup$ – Serban Tanasa Mar 19 '15 at 14:53
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    $\begingroup$ @SerbanTanasa Perhaps you could expand here on the robotic maintenance bullet point from your linked answer. $\endgroup$ – Samuel Mar 19 '15 at 16:21
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The main issue is going to be the increasing complexity. As patches and repairs get layered over each other, as buildings get moved, gradually it becomes harder and harder to understand the full system.

Once something has been patched and remade over the course of thousands and thousands of years you start getting things creep in that are not part of the original design but which are passed on down to the next generation. Things that might not be needed, or might actually make the system work less well.

These problems can be fixed by ripping out the system and rebuilding it from scratch, but if no-one really understands it or if it is tightly intertwined with thousands of other systems then that becomes harder and harder to do.

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