How to calculate the rainfall?

Rainfall is generally measured by rainfall pipes, so it may contain a small amount of dew, frost and pine branches. Meteorology, there is always precipitation in years, months, days, 12 hours, 6 hours or even 1 hour, and all the rain and snow falling within 6 hours melt into water, which is called 6-hour precipitation; All the rain and snow falling within 24 hours melt into water, which is called 24-hour precipitation.

A ten-day rain and snow melt into water, which is called ten-day precipitation ... In a year, all the rain and snow melt into water, which is called "annual precipitation". Liquid precipitation is called rainfall, and sometimes the two are synonymous. The precipitation per unit time is called precipitation intensity, usually in millimeters per hour or millimeters per minute. The rainfall per unit time is called rainfall intensity.

The average annual rainfall of a place for many years is called the "average annual rainfall" of this place. For example, the average annual rainfall in Beijing is 532.0mm, and that in Shanghai is1166.1mm. ..

Extended data:

Basic elements of rainfall

(1) Rainfall duration and rainfall time: Rainfall duration refers to the duration of a rainfall, that is, the time from the beginning to the end of a rainfall. Rainfall time refers to a long period of time corresponding to a certain rainfall, during which the rainfall is not necessarily continuous. Rainfall duration and rainfall time are in minutes and hours.

(2) Rainfall intensity: refers to the rainfall in unit time, and the unit is millimeter/minute or millimeter/hour. ..

(3) Rainfall area: refers to the horizontal area covered by a certain rainfall, and the unit is km2.

(4) Storm center: refers to the local area where the intensity of rainstorm is relatively concentrated.

Rainfall classification

Light rain: 1d (or 24h) rainfall is less than 10mm.

Moderate rain: 1d (or 24h) rainfall 10 ~ 25mm.

Rainstorm: 1d (or 24h) rainfall is 25 ~ 50mm.

Rainstorm: 1d (or 24h) rainfall 50 ~ 100mm.

Rainstorm: 1d (or 24h) rainfall 100 ~ 250mm.

Baidu encyclopedia-rainfall