Author Topic: Rain Gauge  (Read 475 times)

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Offline ocala

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Rain Gauge
« on: September 26, 2022, 05:51:32 PM »
Having a disagreement with my brothers.
They say you can take any cylinder shape container, a bucket or jar etc and as long as the diameter is the same through out all you have to do is measure the amount of water at the bottom to get a total.
I have always thought you  have to figure the diameter, mass etc of said container to get a proper measurement.
I'm not the brightest bulb on the planet but can you use any type of container to get a rain total as long as both the upper and lower diameter is the same?
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Offline Mattk

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Re: Rain Gauge
« Reply #1 on: September 26, 2022, 06:24:11 PM »
A bucket or jar is not good examples (not uniform) but for sure something like a tin can works fine, just measure the depth, what old timers would have used 

Offline Vasco

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Re: Rain Gauge
« Reply #2 on: September 26, 2022, 07:21:40 PM »
They say you can take any cylinder shape container, a bucket or jar etc and as long as the diameter is the same through out all you have to do is measure the amount of water at the bottom to get a total.

They are right, if you measure the depth of the water at the bottom as Mattk says. But it doesn't even have to be a cylinder: anything with vertical sides will do, like a box.

Problem comes when you try to measure depth down to 0.01" in the bottom of a can or box, so it's best if you can funnel the rain you collect into a narrower container where it's easier to measure small amounts (like a CoCoRaHs gauge) or into a tipping bucket gauge - and that's where the math comes in  :-)

And speaking of math: over here we measure rain in millimetres (mm) but in, e.g., Belgium they measure in litres/square metre (l/mē). The number you end up with is exactly the same.
« Last Edit: September 27, 2022, 04:29:21 AM by Vasco »
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