An interesting sum (which might be wrong of course)

An area of 100 x 200 kms (roughly the wettest area over the weekend) getting
an average of 50 mms of rain, received 1,000,000,000 tonnes of water.

An equally useless statistic is that 50 mms rain equates to 50 kgs/square
metre. My small garden will have received about 10 tonnes over the weekend.

The mathematics is not guaranteed. I did the sums while awake in the middle
of the night so there is considerable scope for error!

Jack

"Jack Harrison" wrote in message
...
An interesting sum (which might be wrong of course)

An area of 100 x 200 kms (roughly the wettest area over the weekend)
getting
an average of 50 mms of rain, received 1,000,000,000 tonnes of water.

An equally useless statistic is that 50 mms rain equates to 50 kgs/square
metre. My small garden will have received about 10 tonnes over the
weekend.

The mathematics is not guaranteed. I did the sums while awake in the
middle
of the night so there is considerable scope for error!

Jack

I think you're right - that's a cubic kilometre of water!

For reference, Lake Windermere contains about 0.3 cu.km of water, your
calculation seems right, but it does seems like an awful lot!

- Michael

Jack, I was doing a similar sum over the weekend. My daughter has a new
conservatory with no drainage other than a water butt. It is 220 litres and
filled a couple of times. The roof is 10 square metres and catches all the
rain so 10mm of rain will give 0.1 cubic metres or 100 litres. (100kg). I
make that about 44mm of rain. I think I might use it as a giant rain gauge
as I don't have one!

Dave - confirming your late night maths!
"Jack Harrison" wrote in message
...
An interesting sum (which might be wrong of course)

An area of 100 x 200 kms (roughly the wettest area over the weekend)
getting
an average of 50 mms of rain, received 1,000,000,000 tonnes of water.

An equally useless statistic is that 50 mms rain equates to 50 kgs/square
metre. My small garden will have received about 10 tonnes over the
weekend.

The mathematics is not guaranteed. I did the sums while awake in the
middle
of the night so there is considerable scope for error!

Jack

"Jack Harrison" wrote in message ...
snip
An equally useless statistic is that 50 mms rain equates to 50 kgs/square
metre. My small garden will have received about 10 tonnes over the weekend.
snip


50mm of rain also equates to 2 foot of snow. (It'll never happen I here you say)

It used to.

50mm of rain also equates to 2 foot of snow. (It'll never happen I here
you say)

So now when you have passed this test I have two mo
Question 2: How heavy is an average cumulus cloud ?
Assuming you have 1000 drops per cubic meter, each 0.1mm in diameter,
and cloud is 5 km thick and covers 50 km2.

Question 3: Oh, if a cloud is that heavy, how come it does not fall
down ?

Frankly, I think it is very good exercise to think about these numbers
now and then. Makes you respect the holy omega equation.
=) Elena

I think you're right - that's a cubic kilometre of water!

For reference, Lake Windermere contains about 0.3 cu.km of water, your
calculation seems right, but it does seems like an awful lot!

- Michael

In article ,
Simon S writes:
50mm of rain also equates to 2 foot of snow. (It'll never happen I here you say)

I think some parts of the SW may have had getting on for that amount in
February, 1978 or March 1891, or parts of the South in January, 1881.
But the degree of drifting on all three occasions, it's difficult to
estimate amounts accurately.
--
John Hall

"I don't even butter my bread; I consider that cooking."
Katherine Cebrian

"danny" wrote in message
...
It used to.

50mm of rain also equates to 2 foot of snow. (It'll never happen I here
you say)

In lowland Southern England?
Possibly, but very rare I would have thought.

Col
--
Bolton, Lancashire.
160m asl.
http://www.reddwarfer.btinternet.co.uk

There have been a 'few' (about 8 or 9) accounts of snowfalls in the 1900's
of 2 feet or more in southern England. Many accounts in the 12-18 inch
category, and obviously many more further North.
True, not as many as higher areas in Scotland and Northern England, but you
can bet ya' life we won't see it again in our lifetime. Where have they all
gone?

In lowland Southern England?
Possibly, but very rare I would have thought.

On 24 Nov 2003 07:32:45 -0800, Elena wrote:

Question 2: How heavy is an average cumulus cloud ?

Assuming you have 1000 drops per cubic meter, each 0.1mm in
diameter, and cloud is 5 km thick and covers 50 km2.

Only 1,000/m^3 that only one drop in every 1,000cm^3 or 10cm cube...
hardly an extremely light mist let alone cloud. At a guesstimate you
probably find around 1,000 drops/cm^3 (1 in each mm^3) or 1x10^9 or
1Giga drops per cubic metre.

Question 3: Oh, if a cloud is that heavy, how come it does not fall
down ?

It does, as rain...

--
Cheers
Dave. pam is missing e-mail