What is the approximate boundary line of 800MM precipitation line? What is the concept of 100 milliliters of precipitation?

Isoprecipitation lines are lines on a map that connect points with the same amount of precipitation at the same time. There are 200mm, 400mm, 800mm and other precipitation lines. The following mainly shares what the dividing line of the 800MM isoprecipitation line is. I hope it will be helpful for your study and understanding.

Contents of this article

1. Why is the 800MM precipitation line roughly divided?

2. What is the concept of 100 ml of precipitation?

3. How to calculate precipitation?

Why is the 800MM isohyet dividing line roughly

The 800mm precipitation line is roughly the Qinling-Huaihe line. The 800mm precipitation line is not only the geographical dividing line between the south and the north of my country, but also the dividing line between paddy fields and dry land, the dividing line between rice and wheat planting, and the dividing line between warm temperate zone and subtropical zone.

There are significant differences in the natural environment, geographical landscape, and residents' living and production habits on the north and south sides of the Qinling-Huaihe line.

The 800mm isohyet is also the dividing line between frozen and non-frozen rivers in my country, and the dividing line between tropical and subtropical evergreen broad-leaved forests and temperate deciduous broad-leaved forests.

Isoraint lines are lines on the map that connect points with the same precipitation at the same time. There are 200mm, 400mm, 800mm and other precipitation lines.

What is the concept of 100 ml of precipitation?

It can be called a heavy rainstorm. The depth of the water layer that has not evaporated or infiltrated and has accumulated at any point in the rainfall area is 100 mm. The light rain, moderate rain, heavy rain, and rainstorm are usually measured by daily rainfall. Among them, light rain refers to daily rainfall below 10 mm; moderate rain refers to daily rainfall of 10~24.9 mm; heavy rain refers to rainfall of 25~49.9 mm; and rainstorm refers to rainfall of 50~99.9 mm.

How to calculate precipitation

Rainfall measurement process:

1. The diameter of the rain gauge is 20 cm and it contains a funnel and a bottle.

2. The diameter of the measuring cup is 4cm, and it is used in conjunction with the rain gauge.

When measuring, pour the rainwater in the rain gauge into the measuring cup and read the rainfall for the day according to the scale value on the cup.