How Does A Rain Gauge Work?
Author: Shoaib J.
A rain gauge is a very simple yet useful weather instrument. A conventional rain gauge essentially consists of three parts: a thin, long, cylindrical tube, an outer container that houses that tube, and a funnel set atop that cylinder and container housing.
When it rains, it pours — into the rain gauge that is.
When rain falls, it goes through the funnel that is on top. The rain water collects into the inner cylindrical tube we just talked about. That tube is marked with lines providing measurements in millimeters.
Let’s say the rain gauge we are using collects 25 millimeters of rain water. When and if that cylinder overflows, it will overflow into the outer container we just talked about above. After a set period of time — let’s call it 24 hours for this example, the final measurement will be taken.
When the final rainfall measurement is taken, the cylinder will tell you how much rainfall we just had, due to the millimeter markings on it. Now, we will take another empty cylinder, and pour the water from the outer container into that cylinder.
Next, we will add the measurements from both cylinders, and that is how we get our final rainfall number. If there was a lot of rain, the millimeters may be converted to inches or centimeters — depending on which part of the globe you live in.
That is how your basic rain gauge works. There are other types of rain gauges out there, such as wireless rain gauges, that may employ methods that are a bit more high-tech in nature. The methods may be a bit different from each other — but they all accomplish the same goal in the end.
God bless the genius who invented the rain gauge — since it gives us such useful information that we would otherwise be deprived of.