"Sigmund" wrote in message
...
I'm just visiting this group in the hope of getting an answer to my
question, and this thread seems to be the best one to send it to. The
question is "Is there a formula for determining how much rainfall in cms a
fall of snow equates to when it melts? i.e. 'x' cms of snow when melted =
'y' cms of rain." I guess that the answer will vary a bit because
differing
types of snow will vary in density but even a ball-park answer would be
appreciated.

The rule of thumb is 10:1, but as you say it can vary enormously
according to the water-content and air-content of the snow. In the UK
I've seen (albeit rarely) ratios as high as 25:1 ... or as low as 4:1 even
without significant thawing.

Philip Eden