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Why are manhole covers round?

Learn the structural reason why most manhole covers are round.

Manhole covers are almost always circular. [©Jupiter Images, 2010]
©Jupiter Images, 2010
Manhole covers are almost always circular.

Circular covers are almost universally used on sewer manholes because they cannot drop through the opening.

The circular cover rests on a lip that is smaller than the cover.

Any other shape - square, rectangle, etc. - could slip into the manhole opening.

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