A huge building with a waterfall_2050

This is my personal work. In the near future, a car runs in the sky, and a huge building has a green garden. In the central building, where a population of 50,000 lives, there is a huge waterfall park that completely filters out the drainage of people's lives. I like cyber punk, so I put a huge duct as a point. This was expressed as a system for linking domestic drainage and waterfalls.