How to protect the safety of life and property under the flood caused by heavy rainfall?

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According to the latest news, the Sanming Taining landslide disaster on May 8 , 2016 has resulted in 35 deaths and 1 missing. In addition, according to the China Meteorological Administration sources, the landslide disaster Sanming Taining consecutive days of heavy rain led, in particular day of the incident 4:00 to 5:00, good village pool open Tancun two hours rainfall of 82.4 mm. At about 5 o'clock, an outbreak of mountain torrents in Chitan Village caused natural geological disasters of more than 100,000 square kilometers of large debris flows.

Geological disasters such as floods and landslides caused by heavy rainfall threaten our personal safety and damage our property. Therefore, understanding the formation of disasters and learning safety knowledge helps us to ensure the safety of life and property. Follow the Chinese rescue equipment network Xiaobian to learn about the flood disaster and safety knowledge under heavy rainfall.

(a) How the rain weather formed

We already know that clouds are made up of many small droplets and small ice crystals. Raindrops and snowflakes are made up of them. So, how did small droplets and small ice crystals grow in the cloud ?

In water clouds, droplets are small droplets. They mainly rely on continuing to coagulate and collide with each other and increase. Therefore, in a cloud of water, cloud droplets should be increased to the size of raindrops. First, the clouds need to be thick, the cloud droplets are dense, and the water content is high. In this way, it can continue to increase in condensation; secondly, there must be a strong presence in the cloud. The vertical movements in order to increase the chance of multiple collisions and mergers. In relatively thin and relatively stable clouds of water, cloud droplets do not have enough opportunities for condensation and merger growth. They can only cause cloudy and cloudy days and do not rain.

In various clouds, the distribution of cloud droplets is different. The reason for the uneven droplet size is the transfer of water vapor in the surrounding air and the evaporation of cloud droplets. The factors that make cloud droplets increase are the condensation process and the collision and summation process. In the case of only condensation, the size of cloud droplets is uniform, but due to the addition of water vapor, some cloud droplets increase, plus As a result of the effects, the larger droplets continue to grow and become raindrops. Raindrops fall under the influence of gravity. When there is an updraft, there will be an upward force on the raindrops, which will slow down and some small raindrops may be brought up. Only when the raindrops increase to a certain degree can they fall to the ground and form rainfall.

Precipitation intensity rating standard (inland)

Rainfall intensity

Light rain

In the rain

heavy rain

rainstorm

Heavy rain

Heavy rainstorm

24h rainfall (mm)

0.1 to 9.9

10.0 to 24.9

25.0 to 49.9

50.0 to 99.9

100.0 to 249.9

≥250.0

(B) The Hazard of Floods

Flood disasters are one of the most serious natural disasters in the world. Floods are often distributed in places with dense population, high agricultural cultivation, concentrated rivers and lakes, and abundant rainfall, such as the warm temperate zone and subtropical zone in the northern hemisphere. China and Bangladesh are the areas with the most frequent flood disasters in the world, and floods in the United States, Japan, India, and Europe are also more serious.

China has a vast territory, complex terrain, and remarkable monsoon climate. It is one of the countries in the world with frequent floods and a wide range of influence. About 35% of the country’s arable land, 40% of the population, and 70% of industrial and agricultural production are often threatened by river floods, and property damage caused by flood disasters ranks first among all kinds of disasters.

According to historical statistics, from 206 BC to 1949 of 2155 which, occurs throughout the country large floods 1092, an average of about once every two years occurred. 1954 since 1949 the whole basin of the Yangtze River floods the worst year, the country affected crop area of 2? 4 million hectares, about 3? 3 million deaths.

For example, in 1998 , the devastating floods in the Yangtze, Nen and Songhua River basins affected 340 million mu of land, affected 800 million people (times), and killed 4,150 people.

(three) how to deal with floods and disasters

According to the mechanism of the flood disaster, flood disasters are obviously seasonal, regional, and repeatable. Flood disasters in most countries in the world are prone to occur in the second half of the year. Flood disasters in China mainly occur in April-September . For example, almost all of the floods in the middle and lower reaches of the Yangtze River occurred in summer. Flood disasters are related to the spatial and temporal distribution of precipitation and the topography. The areas with heavy floods in the world are mostly on both sides of the river and coastal areas. For our country, the floods are generally more in the east and less in the west; there are many coastal areas and inland areas; there are many plain areas and there are few highland and mountainous areas. Flood disasters, like climate change, have their own patterns of change. These changes are made up of various long and short periods, causing flood disasters to cycle back and forth.

(4) What are the specific preventive measures?

1. Usually develop scientific living habits that focus on weather forecasts, keep abreast of weather changes, and prepare for family protection;

2. Pay close attention to the flooding information during the flood season and obey the unified arrangement of the flood prevention command department and take refuge in time;

3. Residents in low-lying lands should prepare sandbags, water-retaining plates, etc., or install waterproof gates and install dams to prevent flooding from entering the house;

4. Items such as boats, rafts, life jackets, etc., which can be safely evacuated at home, can be used at any time before the arrival of the flood season.

(5) What kind of materials will be prepared for the coming flood?

1 , a radio radio, at any time to listen to, understand a variety of relevant information;

2 , drinking water, canned fruit juice and long shelf life of food, and tied and sealed to prevent moldy deterioration;

3 , warm clothing and drugs for the treatment of colds, dysentery, skin infections;

4 , communications and contact items, such as flashlights, candles, lighters and so on. Brightly coloured clothing, flags, whistles, etc. are used as a signal to prevent accidents;

5 , the car is full of oil, to ensure that it can be started at any time.

(6) Which areas are dangerous zones when the flood comes?

city:

1. Dangerous houses and surrounding dangerous buildings;

2. Beside dangerous walls and high walls;

3 , flooded sewers;

4. The water wells and pits on both sides of the road;

5. Power poles and high voltage line towers around;

6 , chemical plants and storage of dangerous goods warehouse.

Rural:

1. Beds, reservoirs and channels, culverts;

2 , the flood area, reclamation area;

3. Dangerous houses, dangerous houses, and dangerous walls;

4 , poles, under the high voltage line tower.

(7) How to prevent flooding from entering the room

1 , the door and window of the house is the inlet part. Use sandbags and bags to build defense lines at the thresholds and windows;

2. Seal all the door and window gaps with tape paper and seal several layers.

3 , mouse caves, drainage holes and other places that may enter the water must be blocked.

note:

Do not rush into the water; do not forget to avoid the disaster in the mountains and valleys; do not forget any place that may enter the water; do not drink untreated surface water directly.

(8) Why do not walk on both sides of the road during a rainstorm?

1. Due to the low-lying terrain, both sides of the road are the most vulnerable areas, and it is not easy to identify the situation in the accumulated water.

2. There are buried pipelines and other pipelines on both sides. When the cover of the pit is lost, once it is rushed in, it will injure itself;

3. There may be other dangers in the water in the middle of the road. If the whirlpool should bypass, it will fall into the pit.

6. How to deal with floods while driving?

1 , in the water to be very careful driving, observe the road conditions; 2 , if the phenomenon of flameout in the flood, you should immediately abandoned the car. In an ever-rising flood, it is very dangerous to try to drive an anchored car. 3. Do not attempt to cross a flooded road. The result of this will often be trapped by rising floodwaters.

(9) When the Flood Strikes, How Can I Solve the Problem?

1 , shift to heights. For example, temporary tents should be built on the roof with a solid foundation;

2. When you are in a dangerous house, you must evacuate quickly to look for a safe and secure place to avoid falling into the water.

3 , unless you are forced to evacuate the building after the water may flush with the building or the water surface, otherwise stay and move, wait for the water to stop rising and then flee;

4 , Zhazhi rafts and other escape supplies. Use communication facilities to contact the rescue. The use of spectacle lenses and mirrors to send out distress signals in response to sunlight;

5. Use flashlights and flares to send out distress signals at night;

6. When rescue workers are found, they should promptly wave bright clothes, red scarf and other items to send rescue signals.

(10) What to do if a flood is trapped on a building?

1. When trapped, pay attention to whether the house has collapsed due to flooding. If it is likely to collapse, transfer to safety office immediately;

2. When hunger and thirst occur, young people with good water and good health should be selected to return to their place of residence to retrieve food and clean drinking water;

3. Keep the communication tools and contact the rescue department in time to get help;

4. Use methods such as burning fire, smoking, shouting and waving bright clothes to help search and rescue personnel find and receive assistance.

Note: If the heavy rain continues, we should prepare for flood control in advance; we must establish a concept of survival, and we will certainly be able to be rescued; waiting for water withdrawal is the most effective safety measure.   

This article comes from the Internet, edited by China Rescue Equipment Network.

 

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