Comments for So Just Why Are Manhole Covers Round?

Comment from Smiley on 2012-02-01

2012-02-01T16:48:28Z

because a square manhole cover won't fit

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Comment from frederick myers on 2012-01-11

2012-01-11T15:56:26Z

You will come across some tricky interview questions when it comes time to interview for a job. It may seem as though some job interview questions are designed to put you “on the spot.” To a certain extent they are.Peculiar and indiscriminate interview questions may not seem politically correct, but there is always an interviewer ready to throw one at you, and they expect an answer as well.

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Comment from Shuvo on 2011-11-14

2011-11-14T19:24:19Z

What if I answer that Manhole Covers are round because "Manholes" are round...!!!! :p

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Comment from bagelguru on 2011-10-21

2011-10-22T04:04:06Z

Original manhole covers were made of wood core pieces of tree trunks: round, strong, cheap, abundant.

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Comment from A.V. on 2011-09-20

2011-09-20T12:18:40Z

So, the answer for why manhole covers are round is the same as for why some persons are bisexual--"Any orientation will do".

Interesting. (provide recording of interview to HR compliance for sexual harassment review)

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Comment from pam wright on 2011-08-16

2011-08-16T23:30:34Z

Circles give the maximum area. Therefore more area to move in when going thru the hole.

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Comment from J.M. on 2011-08-16

2011-08-16T20:58:54Z

"Although the premise that manholes are all round has prevailing evidence on the streets, I noticed that at the threshhold of the parking lot, your company is using rectangular manhole covers, which shows a bold, innovative and cutting-edge approach to effectively adopting technology.....etc, etc" [stick around until the latest break for interviewer and watch them dash out to the parking lot/deck]

Good times...

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Comment from Matt on 2011-07-19

2011-07-20T02:33:33Z

Or, if diameter of round hole == width of square hole i.e. same ability to fit through it, the round one uses less material to make i.e. is cheaper

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Comment from David Lewis on 2011-07-19

2011-07-19T14:05:11Z

Why are manhole covers round? Obvious! To provide a dumb but clever-sounding question for job interviewers who have no idea how really to assess a candidate.

"No Hire"

23-Jul-2011

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Comment from Saranya on 2011-05-05

2011-05-05T08:29:40Z

I feel, in case of circle 1) weight covered on the lid is distributed evenly due to its shape, 2) if it slides from its position it will not drop inside till slided part is more than diameter of cover. But in case of rectangle if "slided part>=short side of rect." it can slide

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Comment from B-retired on 2011-03-17

2011-03-17T14:53:14Z

Other possible answers:
"Why do you believe all manhole covers are round?", challenging the validity of the presumption prior to spending resources to resolve the wrong problem.

"If you accept the premise that some manholes are round, it would be only common sense to cover them with a matching shape", applying the simplest of logic and again identifying the determinant factors, which may not be immutable.

and, finally,
"The fact that you are even asking me that question reveals more about the immature style in this company than you may have intended." This shows a strong negotiating position.

Actually that last one is more likely to get you shown to the door.

18-Mar-2011

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Comment from Nik on 2011-01-30

2011-01-31T06:48:55Z

"...a manhole cover to it's hole."
Actually, it's "its hole."

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Comment from Muhammad on 2010-11-29

2010-11-30T03:02:40Z

i was asked the same Q today at an interview. i answered " thay are round so that pedestrians and bikes n vehicles tyres does not get hurt.haha.did not know what to say.

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Comment from set on 2010-11-03

2010-11-03T10:41:54Z

we'll i had this question asked some weeks ago, and my answer does not seem to match any. my answer was it's round because the circle/cylinder is the one of the strongest shapes. if the manhole was square, expansion/contraction of the surrounding material (cement) will eventually make the square shape fail. not to mention that the circle shape works well with the vibrations created by the passing vehicles. I also added what bothers me is why are the manhole covers have a concave/dome profile shape.

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Comment from Glenn P. on 2010-11-02

2010-11-02T09:22:56Z

Uh, Mike, I assume that's a typo for "can't"...?

Heheheheh...

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Comment from mike on 2010-05-16

2010-05-17T00:54:07Z

You can drill a square hole!!!

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Comment from John Withers on 2010-05-08

2010-05-09T01:52:47Z

Just had a quick read through the comments and I'm amazed that my first thought doesn't match anyone elses. Corners promote cracking and subsequent failure. Curves on the other hand do not. I was also surprised the most common answer was that a circular cover can't fall in. That would be my last one. Think about the work necessary to move a square/rectangular manhole into a vertical position to enable it to fall through. It's not something that could be done accidently by a vehicle. Finally I love the one about rolling the manhole being easier. That's a great one. In summary my comment above pretty much proves the point of your article lol.

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Comment from Moe E. on 2010-04-22

2010-04-23T04:34:19Z

Hehe, I was asked this question in an interview and it totally threw me off. I had no idea where to begin so I started with the closest thing I could think of. Here's what I said:

The underlying sewers are all round. The pipes are all round. The round shape is chosen because a circle is the strongest shape for supporting the ground above it, stronger than a square or triangle.Therefore, since the underlying pipes as well as the pipe leading to the streets are round, the manhole cover would be round.

It was a random answer I thought up on the spot.

I'm shocked anyone is still asking this question, it's gotten so much publicity.

23-Apr-2010

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Comment from Richard Armstrong on 2009-12-09

2009-12-09T13:45:36Z

They are round for ease of use, but the best reason is when a heavy object such as a car drives on top of them the weight of the car is evenly distributed along the outer edge of the manhole, thus equalizing the pressure on the whole unit. A square or rectangle will have uneven pressure on the edges and will fail over time.

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Comment from Arvin Kumar on 2009-12-06

2009-12-06T18:38:08Z

Round manholes covers will not fall in as a lot of people have commented above and so will other shapes but from the engineering point of view there is one advantage the round shape offers that other shape cannot match round shape does not have sharp corners that could pop out and injure animals in the days of the cart or damage cars today it also is less likely to have corners that break away thus requiring the manhole to be replaced as a triangle or sqaure shape would

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Comment from mads on 2009-12-04

2009-12-05T06:50:28Z

man holes are round for may reasons,
safety- they cannot fall through their own hole.
cost- they use less materials than other shapes because it's circumfrence is smaller.

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Comment from john neil on 2009-11-13

2009-11-14T02:02:37Z

the simple answer is round hole square peg.....
other answers ease of replacing in hole ..equal size means no manouvering to match hole .it simply drops in.
there are many answers to this question.......

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Comment from Just J on 2009-09-18

2009-09-18T13:18:59Z

Leo

As your father claimed they were easier to manufacture round, and that suggestion was the *only* reason begs the question *why* are they easier to manufacture that way?

Any idea?

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Comment from cameron on 2009-08-23

2009-08-24T01:27:58Z

many of the above answers are true and correct when they are brought together. yes the hole is round and yes the seal is better and yes it cannot fall into the hole. there are other factors too, such as a circle being the strongest shape therefore alowing maximum strength and being able to cope with the huge volume of weight and pressure from above the street. the portability aspect of being able to manouvre the cover due to its rondness is also true. therefore manhole covers MUST be round!!!! and no i did not miss the point of the question

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Comment from Keenan on 2009-08-15

2009-08-15T08:45:22Z

Well, I never really thought of that until I read it.

But it totally makes sense, ok round the cover is larger than the opening! So it can't fall in, even if you rotate it or turn it on it's side.

But... If you use a rectangle for example, still the same effect, but if you turn it on it's side or rotate it, it could fall in, or not line up.

Other "Ideas" around the Manhole.

[Content copied from Wikipedia removed.]

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Comment from Ali Ree on 2009-06-08

2009-06-08T17:22:16Z

I too, knew the answer would be simple...because holes are round....more specifically manholes are round...does that mean I'm simple???/

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Comment from Bart on 2008-12-08

2008-12-09T02:11:09Z

A round manhole cover will not fall through a round manhole because the actual circumference of the frame it sits in is slightly greater than the circumference of the whole itself, thus allowing it to lay flush with the street without falling into the whole. No matter how you position the cover, its smallest diameter (all diameters) is larger than any diameter of the hole.

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Comment from vivebrulee on 2008-10-16

2008-10-16T10:52:17Z

Because round seals in moisture and hence the smell better, than straight edges. The edges would not seal as much during expansion and contraction. Ever wonder why tumblers and dive watches (mostly) are round too? That's why.

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Comment from Adri Malia on 2008-09-17

2008-09-17T10:47:24Z

Because they are not square.............

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Comment from mark on 2008-07-16

2008-07-16T09:09:30Z

Manhole covers are round simply because the friggen manholes are round. Why would you make a cover different from the opening?

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Comment from Rick on 2008-06-02

2008-06-02T10:42:15Z

A round manhole cover would not fall through its circular opening????

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Comment from Erika on 2008-04-21

2008-04-21T21:51:13Z

I was asked that today in an interview....lol

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Comment from terry coon on 2007-10-27

2007-10-27T15:18:41Z

Why won't a round cover fall in the hole? Seams to me it would unless the circumference of hole is less than that of cover.

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Comment from Jennifer on 2007-09-19

2007-09-19T18:42:23Z

This is a good question to use in an interview with a future reference desk librarian. They get questions along these lines all day!

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Comment from Cecelia Nosa on 2007-05-08

2007-05-08T20:35:07Z

When I was asked why Manhole covers are round the first thing that came into my head was because men are not square, silly but true.

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Comment from Carrie on 2006-12-06

2006-12-06T18:53:19Z

My first thought was that if the man in the manhole had to get equipment down there (wires, tools, etc.) the items would not get stuck as easily on a rounded surface. A square surface has corners that items would get caught on. Now that I'm thinking about it...boy am I missing something here!!!

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Comment from Moe on 2006-05-29

2006-05-29T23:59:59Z

I grew up in Nashua, NH and remember manhole covers there were triangular. I was told it was because they wouldn't rattle.
(Should it be personhole cover?)
;-)

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Comment from e hansen on 2006-05-24

2006-05-24T21:13:46Z

The shaft leading up to the manhole is round and as we all know a round shaped 'tube' is not only stronger than a square shaped 'tube' but it also uses less material to manufacture. Think about why submarines are round shaped, they have pressure all around it trying to crush it. The same principle applies to a manhole. Therefore the covers are round. Plus they have the added advantage that they will not fall into the hole like a manhole of a different shape would.

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Comment from Holly Johnson on 2006-04-09

2006-04-09T21:30:35Z

The first answer that came into my mind was, "Because most modern men aren't square." Does that qualify me as logical? By the way, what the f... is a manhole cover, actually?

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Comment from Vance on 2006-04-04

2006-04-04T14:44:56Z

I think if I were asked this question in an interview my response (I'm fairly confrontational) would be to ask the interviewer, what are you REALLY looking for? Abstract thought? Logic? Problem solving?

Ive worked in and around manholes for years and in all parts of the world. I have seen square manhole covers. I have seen square manhole covers fall into holes because they are very heavy, not a little bit awkward, and have a tendency to slide, and the square shape allows for it. I have never seen a square manhole cover fall on anyone and safety is NOT a factor because noone would be working IN a manhole while someone was adjusting a manhole cover above them. Safety IS a factor when the poor schmuck had to lift the thing OUT of the manhole.

I suspect that the reasons that most if not all new manhole covers are now manufactured round are that 1-the cover will never fall into the hole 2-It can be moved fairly easily, 3-The round shape easily facilitates work being performed in the manhole with the most efficient use of space.

Maybe the best interview answer is that if 'I' were developing a manhole that i was going to be required to use on an everyday basis, and considering my work requirements and all other considerations, round manholes would be the logical choice for me. I cant say why others choose to.

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Comment from ruchi on 2006-01-24

2006-01-24T15:02:11Z

Round manhole covers can be tightened to the manhole by providing grooves or threading to it.

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Comment from Stacy on 2006-01-21

2006-01-21T22:13:55Z

Why does it never occur to anyone that manhole covers are round because the manholes themselves are round?

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Comment from Jennie on 2006-01-06

2006-01-06T22:32:53Z

In Hong Kong, I've witnessed countless square manhole covers, as well as those that consist of 2 triangular covers that make up the square shape. I am totally convinced by the logical (+ health & safety) fact that round covers could not fall into the hole, among others. Though I am not too sure giving this answer would guarantee a total success at the interview - interviewers look for your reasoning right? So simply saying I've found opinions that say so isn't gonna impress.

Try this instead: How many trees are there in England? (I was asked that yesterday)

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Comment from John Hills on 2005-11-28

2005-11-29T05:35:12Z

The question implies that a manhole cover is round universally and eternally. This could never be proved. The question should not have been asked.

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Comment from Mattrix on 2005-11-28

2005-11-28T15:56:53Z

Geoff... Perhaps it should...

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Comment from Geoff on 2005-11-27

2005-11-28T00:35:29Z

My manhole doesn't have a cover...

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Comment from Jeremy Smith on 2005-10-15

2005-10-15T17:35:17Z

One reason sewer covers are round is that no matter what position it is in, it won't slip through the hole. Circles and squares are not made equally because if you turn a square sewer cover perpendiculer to the ground and diagonally to the hole, and let go, you will hear a clang or possibly a crash as the thing hits the bottom of the sewer.

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Comment from Monica Rodriguez on 2005-10-01

2005-10-01T13:39:35Z

I am posing this question as a mystery for my geometry students to solve. I am not allowing the use of the Ineternet, but I want to give them clues to solving the mystery. Can you tell me how heavy most manhole covers are?

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Comment from Phil on 2005-09-27

2005-09-27T18:40:36Z

I just asked someone this question at an interview (I know, I should be shot). The reply was "what's a manhole cover?". Serves me right, huh?

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Comment from Elphaba on 2005-09-05

2005-09-06T00:42:56Z

You can fit the same size fat guy into a circular hole and a square hole, so why not just save material and make a circle. Ehehe...*picturing a fat guy jumping into manhole*

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Comment from qUARKA on 2005-08-16

2005-08-16T21:18:34Z

Because they are manufactured in that way. Next question is "Why factories do that?" I do not know. I don't have a degree in this industry.
So how? :)

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Comment from EC on 2005-08-04

2005-08-04T22:48:37Z

I'll ask you next time I need a manhole designed! :)

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Comment from Greg on 2005-06-30

2005-07-01T05:27:57Z

Note: This has nothing to do with a person being a Square.

Circles and Squares were created equal.

Have a happy yellow "smiley face" sticker kind of a day!

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Comment from JP on 2005-05-27

2005-05-27T12:31:38Z

Leo

I think its a crime you are "hawking" this crap for $20 on the net.

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Comment from Katherine on 2005-05-24

2005-05-24T14:46:03Z

I think I had a very unusual answer. My ex used to work for the Parks Dept. and one day was pulling a lawn mower behing him. He was not looking and actually fell into a manhole. Therefore it is to keep people from falling in. Next, my 10yr. old son had a friend who said he had thrown his Aladdin's lamp into the sewer. When my son tried to take the man hole cover off he smashed his fingers. Next, to keep children from getting in. And third the best I could come up with is to let people get in there with the rats and stuff to work on pipes and things. 1,2,3 had a reason for each. We'll see if I get the job. :-)

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Comment from Jamie on 2005-04-03

2005-04-04T00:31:32Z

Yes its also because Circles are one of the strongest shapes in the world.

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Comment from Joe on 2005-04-03

2005-04-04T00:28:33Z

Does it have anything to do with the a circles strenght?

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Comment from Leo on 2005-04-01

2005-04-01T22:13:59Z

I think twice about working for someone who's still actually using this question in an interview.

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A comment on: So Just Why *Are* Manhole Covers Round?

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Comment from marysh on 2005-04-01

2005-04-01T22:07:43Z

Hi,
I was asked this question in an intreview today, and asked to give 3 answers. I could think of only one, and so was asked to think of more answers, andd so I looked up this website!

thanks
Mary

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A comment on: So Just Why *Are* Manhole Covers Round?

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Comment from Damaraju Pawan Kumar on 2004-12-13

2004-12-14T06:55:08Z

Its not that man holes should be round . there are many shapes which work with same efficiency.

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A comment on: So Just Why *Are* Manhole Covers Round?

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Comment from shokri on 2004-12-04

2004-12-04T20:14:15Z

No,t leat the cover go insaed the hole

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A comment on: So Just Why *Are* Manhole Covers Round?

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Comment from pati on 2004-06-11

2004-06-11T21:47:12Z

Ha ha Hugh,
I think thats a very clever response!!!

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A comment on: So Just Why *Are* Manhole Covers Round?

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Comment from Hugh on 2003-11-24

2003-11-24T22:10:09Z

The Dean of the School of Industrial Engineering at Purdue asked our Sr. class the same question. I did NOT gain points by answering "because the holes are round." He was not amused.

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A comment on: So Just Why *Are* Manhole Covers Round?

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