system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : Why are water towers shaped the way they are ?
gpt
The sides are round because that's the most efficient/biggest volume you can get for that amount of material.

The bottom is round so you can put one drain in the middle.

The top is round so that rain and eldritch horrors beyond your comprehension will roll off the top and not pool in the middle.

Then you raise it up enough to get the pressure you need.

Then you make it wide enough to be stable at that height.

Then you make it big enough to hold all the water you need.