Water towers also sometimes have those support rings and you’ll see more rings toward the bottom of the container compared to the top.
That’s because pressure is additive – the same amount of strength required to keep the container secure in the top third takes twice as much in the second third and 3x much in the bottom third.
So you’ll see water towers with rings around them that get increasingly more concentrated together as all the weight at the bottom is supported by a lot of rings. https://untappedcities.com/wp-content/uploads/2021/01/How-does-Water-Tower-Work-Greenpoint-Striped-Brooklyn-New-York-NYC.jpg
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