How many millimeters of rainfall is calculated Thank you

The depth of the water layer that falls from the sky to the ground, and the depth of the water layer that accumulates on the surface of the water without evaporation, infiltration, or loss, is called rainfall (in millimeters), which can visually indicate the amount of rainfall. At present, the commonly used instruments for measuring rainfall include rain measuring cylinders and measuring cups. The rain gauge is generally 20 cm in diameter and contains a funnel and a bottle.

The measuring cup has a diameter of 4 cm, and it is used with a rain gauge. When measuring, pour rainwater from the rain scale into a measuring cup, and you can know the amount of rain for the day according to the scale on the cup.

The China Meteorological Administration stipulates that the rainfall within 24 hours is called the daily rainfall, and the daily rainfall is less than 10 mm is called light rain, millimeters are moderate rain, millimeters are heavy rain, heavy rain is millimeters, heavy rainfall is millimeters, and more than millimeters are called extremely heavy rainfall. Due to the vast territory of our country, a small number of areas have other provisions according to the specific conditions of the province.

For example, in the rainy Guangdong, the daily rainfall of more than 80 mm is called heavy rainfall; In the Yan'an area of Shaanxi Province, where there is little rain, the daily rainfall of more than 30 mm is called heavy rainfall.

If you don't have a rain gauge handy, don't worry, you can make your own with some common utensils, and the results are quite good. Take a disposable plastic or paper bowl with a diameter of 20 cm (a suitably sized instant noodle paper bowl is optional), cut a small hole slightly larger than a corn kernel in the bottom, and place the bowl on a jar without a lid. There is a glass bottle inside the jar, and the mouth of the bottle is connected to a small hole in the bottom of the bowl.

The simple rain gauge is ready. Once the simple rain gauge is ready, it can be placed at a height of 70 cm above the ground (the distance between the mouth of the cylinder and the ground) to receive rainwater. When the rain stops, weigh the water in the bottle on a scale, and 30 grams of water is equivalent to 1 millimeter of rainfall.

Precipitation measurement is generally collected with a funnel with a diameter of 20 cm, and the number of millimeters of precipitation is measured with a special rain gauge. If special forms of precipitation such as snow and hail are measured, they are generally dissolved into water and measured.

The China Meteorological Administration stipulates that the rainfall within 24 hours is called the daily rainfall, and all daily rainfall below 10 mm is called light rain, millimeters are moderate rain, millimeters are heavy rain, heavy rain is millimeters, heavy rainfall is millimeters, and more than millimeters are called extremely heavy rainfall.

Rainfall Measurements:

Rainfall is generally measured with a rain measuring cylinder, so precipitation may contain small amounts of dew, frost, and pine. In meteorology, there are often yearly, monthly, daily, 12-hour, 6-hour or even 1-hour precipitation, and the rain and snow that falls in 6 hours all melt into water, which is called 6-hour precipitation; All the rain and snow that falls in 24 hours melt into water, which is called 24-hour precipitation.

The amount of liquid precipitation is called rainfall, and sometimes the two are also used as synonyms. The amount of precipitation per unit of time is called precipitation intensity, which is usually measured in mm h or mm min. The amount of rainfall per unit of time is called rain intensity.

Rainfall is generally measured by rain gauge or rain gauge, which is to measure the depth of the water layer that falls on a certain point on the ground or a unit area within a certain period of time, and is calculated in millimeters, and there are often years, months, days, 24 hours, 12 hours, 6 hours and even 1 hour of precipitation.

The amount of rainfall is measured in mm, which can be dismantled and milled to visually indicate the amount of rainfall.

The so-called light rain, moderate rain, heavy rain, heavy rain, etc., are generally measured by the daily rainfall only lead.

In the weather forecast, there are professional terms such as light rain, moderate rain, and heavy rain, among which light rain refers to the rainfall within 24 hours does not exceed 10 mm, moderate rain refers to the rainfall within 24 hours is 10 mm, and heavy rain refers to the rainfall within 24 hours and the amount of rain exceeds 50 mm.

The millimeter centimeter of rainfall is calculated using a rain gauge.

The rainfall is generally measured by the rain measuring cylinder, the shell is a metal cylinder divided into two sections, the upper section is a diameter of 20 cm of water funnel, in order to prevent rainwater splashing, the maintainer wax posture.

The area and shape of the mouth, the barrel mouth is made of hard copper into a straight inside and oblique knife edge; A water bottle is placed in the lower section to collect rainwater.

To measure, rainwater is poured into a special rain gauge to read the amount of precipitation.

Millimeters. In the snowfall season, the water storage bottle is taken out and replaced with a barrel without a funnel, and the snowflakes can be collected directly in the rain gauge and read after the snow melts, or the snow scale can be weighed out and converted into millimeters according to the area of the cylinder mouth.

Phases of precipitation:

Meteorology. There are often yearly, monthly, daily, 12 hours, 6 hours or even 1 hour of precipitation, and the rain and snow that falls in 6 hours all melt into water, which is called 6-hour precipitation; The rain and snow that falls in 24 hours are all melted into water, which is called 24-hour precipitation.

All the rain and snow that falls in a decade melt into water, which is called the precipitation in the decade. Over the course of a year, all the rain and snow that falls melt into water, which is called "annual precipitation". The average annual precipitation of a place over many years is called the "average annual rain rotation" of that place.

1. Light rain refers to a daily rainfall of less than 10 mm; Moderate rainfall of 10 mm on a day; Heavy rainfall of 25 mm; Heavy rainfall of 50 mm; Heavy rainfall of 100 250 mm; Heavy rainfall of more than 250 mm.

2. Rainfall refers to the depth of the water layer that accumulates on the water surface without evaporation, infiltration and loss of rainfall from the sky to the ground, generally in millimeters, which can intuitively indicate the amount of rainfall. Rainfall is an important basis for calculating regional water resources, so it is necessary to find an accurate and easy way to increase rainfall.

At present, the commonly used instruments for measuring rainfall are rain measuring cylinders and measuring cups. When measuring, pour the rainwater from the bucket into a measuring cup, and you can know the amount of rainfall for the day according to the scale on the cup.

China's Meteorological Bureau stipulates that light rain refers to rain with precipitation not exceeding 10 mm within 24 hours; 5 mm for moderate rain; 10 mm for moderate rain; 17 mm for moderate to heavy rain; 25 mm for heavy rain; Heavy to heavy rain is 38 mm mm. Rainfall of more than 50 mm in 24 hours is called heavy rain, more than 100 mm is called heavy rain, and more than 250 mm is called extremely heavy rain.

In weather forecasting, "light rain", "moderate rain", "heavy rain", "heavy rain", as well as "heavy rain" and "extra-heavy rain" are clearly scientifically defined in meteorology. For example, "sporadic light rain" refers to a very short period of precipitation, with no more than millimeters of precipitation; "Sometimes there is light rain" means that the weather is gloomy, and there will be short-term precipitation when there is a dry silver shed; "Showers" refers to the sudden start and end of precipitation in the summer, with a large burst and a small burst, with heavy rainfall; "Thundershower" refers to a rain shower accompanied by thunder and lightning; "Localized rain" refers to precipitation occurring in a small area, and the distribution is irregular.

Meteorological forecasts refer to rain and snow as precipitation, and the amount of precipitation is called precipitation, and the unit of precipitation is usually millimeters. 1 mm of precipitation is defined as 1 mm of water depth per unit area.

How much precipitation falls on the field per millimeter, the area of each acre is square meters, so 1 millimeter of precipitation is equal to 0,667 cubic meters of water per acre. Each cubic meter of water is 1,000 kilograms, so 1 millimeter of precipitation is equivalent to pouring about 650 kilograms of water per acre. It has been determined that 5 mm of rain can soak dry land with 3 cm to 6 cm.