I am currently designing a megastructure which is supposed to provide living- and workplaces for about 100.000 people. It is supposed to be designed in a way that it provides everything the inhabitants need for everyday life so they rarely if ever need to leave it. While it is not completely self-contained (food and raw materials are imported, various consumer goods and non-recyclable waste are exported), it should basically contain any facilities your would find in an average city with the same population.
The tech level is about 20 years into the future.
The structure is a single, huge building and roughly box-shaped. About half of it is under ground. I want to design it in three horizontal layers:
- a residential layer where people live
- a commercial layer with shops, recreational, cultural, medical and other public facilities
- an industrial layer where offices, storage, light industry and heavy industry (some of it handling hazardous material and/or producing toxic waste and fumes) are located.
Now I wonder if I should put the industrial layer under ground and the residential layer above ground, or the other way around. Which would be the more logical choice regarding safety, logistics, statics and quality of living?