Why are manhole covers round?

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Why are manhole covers round?

Jilami: answered (2017-04-10 17:04:44)
The question has many answer probably. To start with one shape has to be chosen so why not round. Why round, well maybe the strength of the manhole cover better when round shape. Easier to install as a round shape fits into a round shape easier than a square for example which has to be a in a perfect angle to fit in. Also since the pipes themselves are round then it makes sense the entry is round as well so all water goes into to the pipe.question divider line

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