"Stephen Burt" wrote in message
ups.com...
On 16 Jun, 09:05, Brian Wakem wrote:
David Mitchell wrote:
What a time to break my measuring jar, on the way to the gauge at
midnight. I could only measure the rainfall in cc's - does anyone have
a
conversion to mm's?


Easy to calculate. For a standard 5 in raingaguge = 127 mm diameter
and thus 63.5 mm radius:

For a cylinder of 1 mm depth, volume of water = Pi x radius squared

Thus 1 mm depth = 3.14 x (63.5)^2 = 12, 668 cubic millimetres = 12.668
cubic centimetres or millilitres

Thus 1 mm = 12.7 ml or cm^3

If your gauge is not 5 in/127 mm, recalculate using the appropriate
diameter and radius

HTH.

Stephen
Stratfield Mortimer, Berkshire


Thank-you very much for that.
This gives a rainfall total for the 24 hr period to 0000 yesterday of
75.1mm, which fits in nicely with what the Davis seems to under-record by
currently.
The last time the inner measure over-flowed was an amount over 3 inches, so
this gives an accurate figure.
Watching yesterday's radar, we did seem to catch the heaviest rainfall areas
here, but I'm surprised it was that high a total. Bridlington is the nearest
station for comparison (10 miles due East) and they had 57mm.

--
David Mitchell, 70m amsl, Langtoft, East Riding of Yorkshire.