Inches of rain?

General Questions
#1

How is rainfall measured in inches?

One beer is less than two beers.

#2

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

#3

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