What is a rainstorm?
Heavy rain refers to the rain with very heavy rainfall. So how to measure rainfall? Meteorologists placed a metal cylinder with a diameter of 20 cm in the open air at the ground observation site-rain gauge. The rainfall it receives 24 hours a day is the daily precipitation, which can be measured by a cup. Central weather bureau stipulates: drop every day.
Rainfall below 10mm is called light rain,10-25mm is moderate rain, 25-50mm is heavy rain, and above 50mm is called rainstorm. Rainstorm weather is dangerous to some extent, but not terrible. As long as all kinds of preventive work are done well, there will be no danger.
The flood happened, how to save yourself?
1. When the flood comes, take refuge according to the predetermined route, pay attention to helping the old and the young, and help each other. If the flood comes too fast to be transferred on foot, it is necessary to use boats or floating objects such as door panels and wooden beds prepared in advance as tools to transfer water.
2. When the flood comes quickly and the flood has entered the house, you should quickly climb the roof, wall or nearby trees, take refuge temporarily and wait for the ambulance personnel to move. You can't swim alone.
3. Earth walls, dry houses or mud brick houses can only be used as temporary shelters, because they are in danger of collapse at any time after being soaked in water.
If there are no big trees and courtyard walls, the roof will not climb up for a while. At this time, it is necessary to grasp the fixture and call for help from others.
After the flood, how to prevent the epidemic of diseases?
1? Remove stagnant water and dirt, ventilate and dry, spray disinfectant to prevent infectious diseases and mosquitoes and flies.
2. Take preventive drugs to avoid infectious diseases. If there is an infectious case, it must be treated in isolation.
3. Household appliances should be cleaned and disinfected, and damp and moldy items should be ventilated.
What should mountain students do when they encounter mountain torrents?
If it rains heavily in the mountainous area, flash floods will occur within half an hour. Mountain torrents come quickly, with high velocity, strong scouring ability and great destructive power, which will cause serious disasters to mountainous areas.
1. In case of flash floods, the teacher will escort you across the river. When the water depth exceeds the knee, singles cannot cross the river; When the water reaches waist-deep depth, people should never cross the river. If an accident happens and the river washes you down, you should be clear-headed and try to catch the floating objects in the river or the roots and branches on the shore to escape.
2. When the mountain torrents are rising so fast that the teacher can't escort them across the river, all the students have to go back to school for the night.
3. During the summer vacation, mow the grass and hoe the ground on the mountain, and take refuge in caves and other places when it rains cats and dogs, so as to prevent landslides, rolling stones and collapses.
4. Hey, son? Hey? Forever pry? Hey? Are you scared? Are you tired? Do you want to pay for coral reefs? What's the matter with you? br/>； 5. If the wires droop, you can't touch them with your hands or body; When the low power line has been washed away by the river, you can't stay by the river, let alone cross the river here. Electric shock accidents will occur in these situations, endangering life safety.
6. When the water depth is less than one meter, the fluctuation of water potential is not obvious, and primary school students have to cross the river in a hurry, the teacher can organize the following measures: tie everyone's waist into a straight line with long ropes, schoolbag belts and kettle belts, tighten their hands, and cross the river obliquely in the same direction as the water flow to reduce the water flow resistance.
What if there is a traffic jam on the way to or from school?
1.？ When the flood washes away, the road collapses, or the road is cut off by the waist, and there is a torrent passing through, you can only "take refuge temporarily" in a safe place at this time, and you must never force your way through.
2. When roads in mountainous areas are blocked due to landslide accumulation, it is safer to bypass the mountain and pass through the upper part of the landslide surface.
3. When the flood has washed away the bridge and culvert, the river is rushing and the bridge deck is still collapsing, you must not risk forcing through, otherwise your life will be in danger.
4. When the high-voltage tower topples and the wires are perpendicular to the road, first, stay away from it to prevent electric shock; The second is to report to the relevant departments for timely maintenance. At this moment, we must not muddle through.
How to ensure the safety of debris flow in mountainous areas?
When heavy rain and floods occur in mountainous areas, sometimes mudslides occur at the same time. If there is a mudslide, stones, sand, mud, fruit trees, buildings and residential areas in the valley will be pushed out of the valley and piled up at the mouth of the ditch, and the whole valley will become a "smooth slate", which is extremely destructive. 1. Debris flow is accompanied by heavy rain and flood. Before the rainstorm comes, there is a possibility of debris flow in the ravine where you live, so you should move to a safe place for temporary refuge.
2. Debris flow broke out from the top of the ditch, and the noise was like "bang … bang …". No matter day or night, when sheltering from the rain in the house, as long as you hear this sound, you should quickly run outside and transfer to the top of the mountain.
Debris flow broke out in a short time, so we can only help the old and take care of the young, and have no time to find and carry food and drink.
4. Choose a good transfer route in advance, remove obstacles along the way, and avoid pumice and landslide injuries when going up the mountain quickly. At the same time, lightning strikes and wire injuries should be prevented. Hope to adopt, I wish you progress in your study.