Inches of rain?

[the first supraliminal]

How is rainfall measured in inches?



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One beer is less than two beers.

[Bobinelli]

Here you go Beeruser...
http://www.bbc.co.uk/weather/features/notebook/rainfall.shtml

[Fichchef]

Or you can go into Straight Dope #2, i believe, where the Illustrious Omnipotent Stomper himself gives the skinny.