For example recently Hong Kong has had 6 inches of rain in an hour. But how do they measure this as the level of water is not equal in all areas?
In: 5
There are measuring stations.
The most basic ones are just a tube in a field. It’s sufficiently wide to account for rain that isn’t falling straight down, and sufficiently clear on all sides to prevent wind currents around buildings from manipulating the readings. The amount of rainfall is recorded from them.
In older times, they would just be manually measured after a rain storm. There’s all sorts of tooling to automate it, but the premise is the same these days — just catch the rain while controlling for variables. Do it in many locations and average it for better results.
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