Learn the structural reason why most manhole covers are round.
©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.
Search the Web
We are not lawyers or legal professionals, nor are we financial counselors or professionals. The content of this Web site is intended to provide general information and advice. Prior to making any legal or financial decision, you should consult a licensed professional. For more information see Terms of Service/Usage Agreement.