Why is sewer round

It would make it harder to fit with a cover. You'd have to rotate the cover exactly the right way. Therefore, many manhole covers are round so they don't need to be rotated. There are no corners to deal with. Also, a round manhole cover won't fall into a hole because it was rotated the wrong way, so it's safer. There may be other reasons why corners are a problem and why a round shape is better. You can't cut yourself on a round manhole cover. And because it's round, it can be more easily transported.

One person can roll it. Here's a good example of a market sizing. How many people live in China? This is question you are almost guaranteed to receive in any interview. And if using a square because the square was significantly longer than their diagonal length of each side, so the covers were rolled on, it is easy to fall into the wells diagonally wellhead, causing a safety hazard. Some people might ask, if the wellhead made of round or significantly less than covers, square manhole cover will not fall into the well.

Here it involves maximum material utilization and conservation issues. The use of wellhead depends on the wellhead size, if you have to install a square manhole cover much larger than the wellhead, then the use of natural materials and practical value is not good as the circular covers more efficiently. Round sewer covers not only save materials but also ensure the safety of the wellhead.

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