"Phil Layton" wrote in message
...

"Martin Rowley" wrote in
message ...
RMK: 8Ns015/020 .. one of those rare occasions when I think I can observe
Nimbostratus and nothing else - uniform base and rain bucketing down!
It's been raining steadily here, mainly moderate, since 1230Z: all
buckets, water butts etc., nicely full ;-) =

Martin,
5mm of rain here and the butts are approx half full. I guess it takes 10mm
to fill a 210litre butt.

How big is the surface area that you draw from, Phil ? I feel a formula
could be created here...

Joe