A little teaser.
Posted: Thu Jun 09, 2016 9:37 am
In a year how much rainwater will fall on a single acre in an area with 10 inches annual rainfall?
Answer in gallons.
JB.
Answer in gallons.
JB.
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A little teaser.
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Re: A little teaser.
Posted: Thu Jun 09, 2016 10:43 am
271.5 gallons give or take a pint or two
Re: A little teaser.
Posted: Thu Jun 09, 2016 3:13 pm
1 gallon... That was 10 inches horizontally if rain wasn't it?
Re: A little teaser.
Posted: Thu Jun 09, 2016 3:34 pm
27,154 - though I suspect that's US gallons.
So that would be 22,610.4348 Imperial gallons.
So that would be 22,610.4348 Imperial gallons.
Re: A little teaser.
Posted: Thu Jun 09, 2016 4:25 pm
I got the same allan but I put the decimal point in the wrong place then again I did not realize they where Yankee gallons
Re: A little teaser.
Posted: Thu Jun 09, 2016 5:04 pm
I make it 22610.7 uk gallons
Or 27154.3 us
So give or take the same as robo and alan
Or 27154.3 us
So give or take the same as robo and alan
Re: A little teaser.
Posted: Thu Jun 09, 2016 5:24 pm
I am anticipating the answer to be none,
but I haven't worked out why that is yet.
but I haven't worked out why that is yet.
Re: A little teaser.
Posted: Thu Jun 09, 2016 5:27 pm
An acre is 4,840 square yards, one of those odd numbers lodged in a pre-metric brain, so:
4,840 x 9 = 43,560 square feet, at 10" deep (you could have said a foot JB!) becomes 36,300 cubic feet. One cubic foot is 6.2288354590428 imperial gallons so answer is 226,106.7271632536 gallons.
Now what I should do is delve into my Chemical Engineering training of about 50 years ago and ask if in a deluge, like there have been a few of recently, a fifth of this fell in an hour what diameter of pipe would be required to take it away? If I could remember how to do this I think I would prove the futility of most flood defences.
PS : I found an online calculation that suggested an 8" pipe would cope with 2" per hour on an acre, seemed smaller than I expected.
4,840 x 9 = 43,560 square feet, at 10" deep (you could have said a foot JB!) becomes 36,300 cubic feet. One cubic foot is 6.2288354590428 imperial gallons so answer is 226,106.7271632536 gallons.
Now what I should do is delve into my Chemical Engineering training of about 50 years ago and ask if in a deluge, like there have been a few of recently, a fifth of this fell in an hour what diameter of pipe would be required to take it away? If I could remember how to do this I think I would prove the futility of most flood defences.
PS : I found an online calculation that suggested an 8" pipe would cope with 2" per hour on an acre, seemed smaller than I expected.
Re: A little teaser.
Posted: Thu Jun 09, 2016 7:25 pm
What's a gallon??? 
Westi
Westi
Re: A little teaser.
Posted: Thu Jun 09, 2016 7:36 pm
Westi. Eight pints of cider.
Re: A little teaser.
Posted: Thu Jun 09, 2016 7:41 pm
Westi wrote:What's a gallon???
Westi
4546.09 millilitres
Re: A little teaser.
Posted: Thu Jun 09, 2016 10:50 pm
Westi wrote:What's a gallon???
Westi
About how mutch the patients in the alcohol unit can throw up before you send the student to get a bigger bucket
Re: A little teaser.
Posted: Fri Jun 10, 2016 1:27 am
Answer:
43560 x 144 x10
277.44
= 226089. 9645. gallons
Rounded up = 226090.00. Gallons.
Which to me is a staggering amount.
JB.
43560 x 144 x10
277.44
= 226089. 9645. gallons
Rounded up = 226090.00. Gallons.
Which to me is a staggering amount.
JB.
Re: A little teaser.
Posted: Fri Jun 10, 2016 7:35 am
At a rough calculation, that works out at about a pint per day on average.
226090 ÷ 4840 = 46.712809 gallons per square yard per year
46.712809 ÷ 365 = 0.1279802 gallons per square yard per day
226090 ÷ 4840 = 46.712809 gallons per square yard per year
46.712809 ÷ 365 = 0.1279802 gallons per square yard per day
Re: A little teaser.
Posted: Fri Jun 10, 2016 8:14 pm
Funny Dan Numbers!
Friday & Saturday night in A & E! Those disposable vomit bowls hold about 500mls - my shoes sometimes held more! The ETOH unit tended to bleed all over me. Can't break the habit of having a spare of everything even though no chance of any mishap in my current post - unless you count tears, which do come with associated nose discharges & shiney dried bits on your shoulder!
I must say I am very impressed with all you guy's mathematic skills! Really amazing!
Westi
Friday & Saturday night in A & E! Those disposable vomit bowls hold about 500mls - my shoes sometimes held more! The ETOH unit tended to bleed all over me. Can't break the habit of having a spare of everything even though no chance of any mishap in my current post - unless you count tears, which do come with associated nose discharges & shiney dried bits on your shoulder!
I must say I am very impressed with all you guy's mathematic skills! Really amazing!
Westi