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Could I have gotten a better word? At first, I overlooked the obvious. I thought, hmmm, I painted another water tower. What does gravity have to do with water towers??
Then it hit me. Derr! Water towers never fail because they work off gravity.
Water towers are very simple. A pump pressurizes water and pushes it into the water tower. Gravity forces the water back down the pipes every time you turn on your facet.
The gravity causes the pressure. Water towers are tall to provide pressure. Each foot of height provides 0.43 PSI (pounds per square Inch) of pressure (I had to look that up :).
You can view this painting of The Tipper Tie Water Tower Step by Step.
Or view the sketches.