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Worldbuilding

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    $\begingroup$ This might not work that well in climates with long cold periods, but indoor farming in these same climates might not be feasible. $\endgroup$
    – vinzzz001
    Commented May 28 at 13:52
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    $\begingroup$ downside of growing underwater is far lower levels of co2 and oxygen plants need to grow and without a water gradient they can't move nutirents easily internally. .hydroponics is one thing but total emersion puts severe limits on plants. $\endgroup$
    – John
    Commented May 31 at 18:56
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    $\begingroup$ That perfectly explains why there is always waterfalls from the floating rochs! Besides, the most efficient way for a artificial river would be a vertical spiral (an o with a slope, repeated multiple times) in terms of building, maintenance, space efficiency and continous production, plus you can mount artificial lighting, nutrient depletion and whatever you want on the layer above. And you will have to decide between asexual reproduction (cloning, widely used among plant species) and a insect population that may be complicated to stabilize. $\endgroup$
    – syck
    Commented Jun 4 at 18:59
  • $\begingroup$ @syck I wasn't going for space efficiency as much as making it as multipurpose as possible, taking up more space to fulfill even more functions. Having a space set apart for food production is one thing. Having that same space serve as heat-sink, rain water drain, and some parts as park ponds/decorations. $\endgroup$
    – vinzzz001
    Commented Jun 5 at 10:00
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    $\begingroup$ @vinzzz001 There ist no reason that such a spiral should not wind along balconies or alike, giving close-to-water advantages to your residential structures. Placement on the flat top of an arcology would make your constructions more wind-prone and therefore more difficult to control. $\endgroup$
    – syck
    Commented Jun 14 at 13:06