The most common rain gauge used today by official forecasters and airports was invented over 100 years ago. The official rain gauge has a 50 centimeter high cylinder with a 20 centimeter in diameter funnel that collects water into a measuring tube that has exactly one-tenth the cross sectional area of the top of the funnel. Contrary to some village people saying they can use a Bush Bean Can to measure the rainfall. The reason for the smaller measuring tube is so that more precise rainfall measurements can be made due to the exaggeration of the height of water in the tube. For example, one-tenth of an inch of rainfall would actually fill an inch of the measuring tube. A special measuring stick inserted into the measuring tube takes into account the vertical scale exaggeration. This exaggeration allows meteorologists to make very precise measurements to one-hundredth of an inch. The standard rain gauge can measure up to two inches of rain. If rainfall exceeds two inches, water overflows into the cylinder surrounding the measuring tube. The observer takes the water in the cylinder and very carefully pours it into the measuring tube after emptying the tube. The observer then adds the measurement from the water in the cylinder to two inches in order to obtain the final rainfall amount.
5 comments:
The good rain, like the bad preacher, does not know when to leave off.
- Ralph Waldo Emerson
Don't empty the water jar until the rain falls.
- Philippine proverb
I'm not sure if this is really a metaphor for something else?
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To a gardener there is nothing more exasperating
than a hose that just isn't long enough.
- Cecil Roberts
as long as we are talking about water.........you can't tell how deep the well is by the handle on the pump......
it's not the size of the ipod that matters, rather the music in it
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