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The depth of the water layer that has accumulated on the surface of the water from the sky, which has not evaporated, permeated, or lost, is called rainfall (in millimeters). It can be used to visually represent the amount of rainfall. There are basically two types of rainfall recorders for measuring rainfall: rain gauges and rain gauges. Rain gauges can be divided into dump bucket rain gauges and siphon rain gauges. In addition, if there is no special instrument for rainfall measurement, it does not matter, we can make a rain gauge.
What do we mean by the amount of rain that we're talking about when we reach 5mm? Here we first understand some of the basic concepts related to rainfall. The rainfall of 1mm is 0.667 cubic meters of water per acre, and the area of ​​one acre of land is 666.7 square meters. Each cubic meter of water is 1,000 kilograms, so that 1 mm of precipitation is equivalent to pouring about 650 kilograms of water per acre. According to the measurement, a drop of 5 millimeters of rain can make the dry land soaked 3-6 cm. What do the meanings of light rain, moderate rain, heavy rain, and heavy rain often mentioned by meteorological departments when they release weather forecasts? Light rain refers to rain that does not exceed 10 millimeters of rainfall within 24 hours, ranging from 5 millimeters to 16.9 millimeters for small to moderate rains, 10 millimeters to 24.9 millimeters for moderate rains, 17 to 37.9 millimeters for moderate to heavy rain, and 25 millimeters to 49.9 for heavy rains. Millimeters, as large as rainstorms are 38mm-74.9mm. Rainstorms with more than 50 millimeters of rainfall within 24 hours are known as heavy rainstorms. Over 100 millimeters are called heavy rainstorms, and over 250 millimeters are called extraordinarily heavy rainstorms.
From the above, it can be seen that in the meteorological department, the rainfall recorder can record the current amount of rainfall in time, which is very practical. The tipping rain gauge in the Rainfall Recorder is a wired telemetering instrument that can continuously record precipitation changes over time and measure cumulative precipitation. The sensor and recorder are divided into two parts, which are connected by cables. The siphon type rain gauge is an instrument that can continuously record the amount of precipitation and precipitation time. The shape and size of the upper water holding funnel are the same as those of the rain gauge. The rain gauge is used to measure the accumulated precipitation over a period of time. The common gauge housing is a metal cylinder divided into upper and lower sections. The upper section is a water-filled funnel with a diameter of 20 cm. It is kept to prevent rain splashes. The mouth area and shape of the container, a water bottle is placed in the lower barrel to collect rainwater. The TPJ-32 Rain Logger, produced by Top Instruments, automatically records rainfall data and can also set the interval time. The instrument will collect the rainfall data periodically, and then transmit the data to the computer. The software automatically generates the curve graph and then the data. deal with.
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