On 23 Dec 2012 09:58:53 GMT, Norman wrote:

That set my mind thinking. If there is 1m of rain (1000 mm) in a year
that means that over 1 sq m the total fall will be 1 tonne of water.
Therefore over 1 sq km the total amount of water in a year will be 1
million tonnes. That's an impressive total - or have I got my sums
wrong?!

Nope and it's all come from clouds floating in the sky...

--
Cheers Dave.
Nr Garrigill, Cumbria. 421m ASL.