[Weather] conversion help

[Matthew Smith]

Matt wrote:
>> I took down my rain gauge over the weekend and ran 2 liters of water through
>> it.
>> It registered 385 tips.
>> The collection aperture is 5.5cm x 12.5cm
>>
>> So that 5.2 ml per tip for an area of 68.75cm
>>
>> How do I figure out how many mm rainfall 1 tip is ?

Jim replied:
> 5.2 ml = 5.2 cm^3  / 68.75 cm^2 = 0.075 cm = 0.75 mm per tip

Which is pretty close to the 0.7mm that I get from my Lacrosse, which
only registers every other tip.  I have verified my figures against an
old, low-tech cylinder gauge.

Now, considering that this was supposed to be an Imperial (I belive that
you call it "Traditional" in the USA) gauge, just what kind of figure is
that?  1.5 points per tip?  (Assuming that it registers both ways.)

Can't say I'm that impressed with the Lacrosse stuff - they can't even
come up with a UV-stable plastic.  (Possibly Canada doesn't have such a
big ozone hole as we do in the Antipodes.)

Dear Santa, I would like a stainless steel, tipping bucket gauge that
will resolve to 0.25mm...

Cheers

M

-- 
Matthew Smith
IT Consultancy & Web Application Development
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