The normal answer to this question would be because every projection of the circular manhole cover on the hole would be equal to its diameter, thus preventing it from falling inside, unlike say a square or an equilateral triangle or a pentagon.
But there are certain assumptions in that question which are not clear. The first answer, that occurred to me, was that it would be easier for the manufacturers to make circular holes. If you are Indian I can almost guarantee that this logic would sound more sound to you than the earlier one. Because... why would a manufacturer who gets a government contract to make manholes for public roads care about the utility of the product to the public or maintenance workers?
But there are certain assumptions in that question which are not clear. The first answer, that occurred to me, was that it would be easier for the manufacturers to make circular holes. If you are Indian I can almost guarantee that this logic would sound more sound to you than the earlier one. Because... why would a manufacturer who gets a government contract to make manholes for public roads care about the utility of the product to the public or maintenance workers?
Digging a circular manhole might be easier but to me making square manhole COVERS is more comfortable. As a result you would find square covers very prevalent in India :P
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