On a good day, one big tank can do what these 32 tanks are doing. What you want is for water to get to all the flats. As long as water is always in that one tank, it will get to all the flats.
There are only three conditions:
1. Make sure there is always power to pump water into the tank. Standby gen or solar panel for the pumping machine.
2. A floatswitch to automatically start and stop the pumping machine based on the quantity of water in the tank.
3. The tank must be placed higher than the building if you want to rely on gravity to send water to all the apartments.
You don't need 32 tanks for 32 flats. What you need is one tank that continuously has water.
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