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Worldbuilding

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    $\begingroup$ Hills, if made of easy swept away material like sand of clay are not really safe. Especially in tsunami like environments, were the water contains abrassive materials like scrap from houses, people, etc. The hills would need to be cased with concrete. $\endgroup$
    – Pica
    Commented Jul 25, 2023 at 13:54
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    $\begingroup$ I don't think there's a moving problem--I think he's envisioning a society that built for it. $\endgroup$
    – Loren Pechtel
    Commented Jul 26, 2023 at 1:16
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    $\begingroup$ @Pica In a world with frequent tsunamis, you won't have any hills made of sand or clay. They wouldn't have long enough to build up before the next one washes them away. $\endgroup$
    – Graham
    Commented Jul 26, 2023 at 7:14
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    $\begingroup$ And even if you did have hills of sand, just don't build on those specific hills! There are no doubt a few other interesting things that will happen (runoff directions taken far more seriously, underpasses avoided like the plague, etc.), but the fundamental answer to not having your city destroyed is building it on higher ground. Note that while many people don't listen, or perhaps their situation provides no better choice, the real-world practical, historical response to tsunami-prone areas has always been "don't build there." $\endgroup$
    – GrandOpener
    Commented Jul 26, 2023 at 17:51
  • $\begingroup$ The towns in tyrol are by definitions in the "hills" but the bigger clouds crash into that and come down the mountain, like an avalanch coming from a fountain. So be in the hills, even in the hills. $\endgroup$
    – Pica
    Commented Aug 1, 2023 at 7:12