Mexico City is 7500 feet above sea level there is no way you.are pumping water uphill for 22 million people Bruce power the largest nuclear faculty in the world has 8 reactors and that would be about the power needed to pump enough water nearly two miles into the sky for 22 million people. They should ask Israel and Las Vegas to share their water recycling tech. That’s the answer toilet to tap. The Israelis recycle 90% of their water. Las Vegas recycles every drop that hits a drain in the basin. Use the existing water again and again. Outlaw lawns and any consumptive use every drop that hits a drain is cleaned, disinfected and returned to the water supply as reclaimed water. Texas has two toilet to tap in West Texas I worked on one as a hydrogeo they supplement with brackish water to 500ppm via desal that was my part. To replace losses via pipe leaks and yards. Yards should be illegal in arid regions.
>> there is no way you.are pumping water uphill for 22 million people<<
Large number of vertical sump pumps in series to overcome static head