Is the water from the top transported from the bottom to the top?

Generally speaking, the water supply problem of high-rise buildings is considered by layers, that is, water supply by stages. Normal municipal water supply is considered for floors 1~7, pressurization equipment is added to pipelines for floors 8~ 16, and water supply is provided by roof water tanks for floors above 17. What kind of waterproof water supply is selected from the perspective of cost and water consumption. There are also pressure regulating devices (pressure reducing devices, pressure stabilizing devices, etc.). ) on the corresponding pipeline to ensure the basic water pressure of the pipeline.