5/1/2023 0 Comments Rain gaugeYou would record this as 0.35 inches and report that you have 35 hundredths of an inch of rain. This would be saying that you have three dimes and five pennies. What if I have a measurement on the middle line between 0.30 and 0.40? Here is an illustration of the calibrated measurement tube of the rain gauge that contains 30 one-hundredths of an inch (0.30 inches).ģ. 30, you would say that you had three tenths of an inch of rain or 30 one-hundredths. When recording rainfall that has reached these lines we write them in the same way 0.20 We record a dime in our checkbook as 0.10 or if you have two dimes 0.20. The longer lines on the measuring tube would be like a dime. This is also called one hundredth of an inch. We would write in our checkbook that we have 0.01 dollars, and when recording rainfall you would write 0.01 inches. The smallest line on the measuring tube would equal one penny. Imagine that the gauge is equivalent to a dollar, but instead of having one paper bill you have ten dimes or one hundred pennies. The measuring tube is divided, marked and labeled in smaller parts (increments) in tenths and hundredths. Remember that the measuring tube when full holds one inch of precipitation. The measuring tube is designed to magnify the rainwater. What do the numbers mean on the side of the measuring tube and how do I read them? Here is an illustration to help you understand this process.Ģ. Always read the base of the meniscus when taking measurements. This meniscus is formed by the surface tension of a liquid in contact with the sides of the tube. How do I know where to read?Īs water fills up the measuring tube, a curved surface is formed called a meniscus. The surface of the water in the gauge looks curved. Here are several situations that you may encounter when reading your rain gauge and how you should deal with them.ġ. Reading the rain gauge is a very easy thing to do, but mistakes can occur. When it rains more than one inch, the excess water collects in the overflow tube. The measuring tube, when full, will hold "one inch" of rainfall. This allows observers to report rainfall to the nearest 0.01" (one hundredth of an inch). The funnel directs the precipitation into the measuring tube and magnifies it by a factor of 10. The rain gauge is composed of three parts: a funnel, a measuring tube, and a 4-inch diameter overflow tube, and a mounting bracket. Scientists, engineers, and other professionals may use your data. It is important to be as accurate as possible when reading your gauge.
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