Why are manhole covers round?

Question

Dr. D · Accepted Answer

Actually, it's because the circle of a larger diameter (cover) cannot fall into the circular hole of a smaller diameter (manhole). With any other shape, that would be possible, provided their dimensions are relatively similar.

MK · Answer

So it would not fall inside

Ilikethemround · Answer

Being round also lends itself to rolling. Manhole covers are not light by any means.

GB · Answer

Cylindrical holes are easiest to dig. So, the manhole being the top of a cylinder is a circle.

Mike · Answer

Because it makes it the easiest to put back into place and have a better guarantee of it being seated properly.  Also, it makes it easier for entrance and exit of the hole.

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