I am a civil engineer.never comment these places. This time I do as most of you'll aren't either getting completely correct or only partially. A few reasons mentioned are valid to certain extent but the main reason is as follows - point wise :
Its a stupod question. The Manhole covereps are square, rectangle and triangle too. Its in our mind that we have it round only as its to cover a hole which is round!!
in manufacturing a circular plate you have to take care of two dimensions thickness and dia. ,while if its a square or rectangular plate its 3 dimensions (l b h). It also gives maximum surface area to enter with same quantity of material to make the lid.
Re: manhole is round
by Niraj Agarwal on Nov 25, 2014 07:48 PM
A circular cover can never accidentally fall inside the hole as the diameter of the cover is greater than that of the hole. But sqaure or rectangular shaped cover can fall inside.
Re: Re: Re: manhole is round
by svsrao rao on Nov 26, 2014 09:53 AM
Agarwal answer is correct.the lid should not fall down and same time man entry is should be possible
Re: Re: Re: manhole is round
by natarajan shashi on Nov 26, 2014 10:43 AM
For a given width circle has the lowest are, thus lightest metal us, apart from that it cannot fall inside.
Re: would choose legs since i can go
by kumar kn on Nov 25, 2014 02:08 PM
also i can use legs to do some of the work done by hands. But i cannot use hand to walk, it is not safe. Also I will end up with my mouth facing others waist, which i dont like.;)
It easier to give round shape rather than making four or three corners. A round shaped rim will have a better grip on the concrete filling of its cover and will be easier to carry up to the manhole.
Re: Round manhole
by Hebbar R on Nov 25, 2014 02:02 PM
That is not right. It is round for the simple reason that the lid cannot drop into the manhole - no matter how one tries to. That is not possible with rectangular/square. The lid can be dropped into the manhole if dropped in sideways.
Re: Round manhole
by sai subramanian on Nov 25, 2014 05:50 PM
The reason is simple - Manhole can be easily moved on the roads (like tyre since its round in shape)
Re: Round manhole
by Kabeer on Nov 25, 2014 06:20 PM
Since it is a hole it has to be round otherwise it would have been called man-square; man-rectangle; man-triangle, man pentagon, man-hexagon, man-oxagon etc.,
The real question is why is it called a MAN-hole and not a WOMAN-hole?
