Could you build a water tower that is a cube to be as effective or more as one that is a cylinder?
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In a water tower, the pressure is determined by height.
A circular cross section will let you store more water with the same amount of material, partially because it minimizes surface area per unit volume, but mostly because you eliminate the extra forces caused by the water trying to bend a flat wall outward, the wall is already bent outward so the pressure just loads it in tension.
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