Publicity of flood control knowledge on the street

Publicity of flood control knowledge on the street

There must be a lot of common sense about flood control that you don't know. The following is what I collected for you. Publicity of flood control knowledge on the street? I hope I can help you!

Classification of rainfall grades

1. What is the general standard of rainfall classification in daily life?

People often hear terms such as light rain, moderate rain, heavy rain and rainstorm in weather forecast, but what is heavy rain or rainstorm and what is the standard of rainfall classification? In fact, the rainfall levels in the weather forecast we often hear are classified according to the 24-hour precipitation. Usually, the 24-hour precipitation is light rain between 0. 1 and 9.9mm, moderate rain between 10 and 24.9mm, heavy rain between 25 and 49.9mm, heavy rain between 50 and 99.9mm, and heavy rain between 100 and 249.9mm..

2. How many ways are there to divide the rainstorm weather? What is the difference between the application of different methods?

In meteorology, in addition to the 24-hour rainfall process of more than 50 mm, there are many methods to divide the rainstorm according to different time periods. For example, if the precipitation exceeds 15 mm within 3 hours, it is called rainstorm, and if it exceeds 28 mm, it is called rainstorm; Rainstorm occurs when the precipitation exceeds 25mm within 6 hours, and rainstorm occurs when it exceeds 55mm. 12 hour, when the precipitation exceeds 30mm, it is called rainstorm, and when it exceeds 70mm, it is rainstorm.

In application, in order to objectively express the intensity of rainstorm, it is necessary to choose different rainstorm division methods according to the duration of rainfall. For example, July 20 12, 20 13? At 2300 hours, the precipitation in Sanmenxia City was as high as 75.8 mm in just three hours. If the rainfall is divided according to the 24-hour rainfall level, it will only reach the level of torrential rain, but according to the 3-hour rainfall level, it will reach the level of torrential rain. Due to the short precipitation time and large precipitation, serious disasters such as road damage and house collapse have been caused to the lakeside area. Therefore, when checking weather forecast and weather warning signals, we should not only pay attention to the size and grade of precipitation, but also pay attention to the duration of precipitation. According to the forecast of rainfall intensity and duration, we can judge the possibility of disastrous weather so as to take necessary preventive measures.

3. Why do short-term rainstorms easily cause disasters such as urban waterlogging and mountain torrents?

The precipitation weather that causes urban waterlogging, mountain torrents and other disasters is closely related to precipitation intensity and total precipitation. If the same 30 mm precipitation falls to the ground within 24 hours, the urban drainage system can cope with it calmly, and the soil can absorb water slowly without causing obvious disasters. However, if the precipitation of 30 mm' falls to the ground in a short time, it will form a short-term rainstorm, which is easy to cause waterlogging in cities, and there is also the danger of causing disasters such as mountain torrents, landslides and mudslides.

Self-help common sense:

1. How to save yourself in case of flood: (1) When the flood comes, take refuge according to the predetermined route, pay attention to helping the elderly 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) The flood comes quickly. When 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 transfer. 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. (4) If there is no big tree, courtyard wall and roof, you can't climb it for a while. At this time, you should grasp the fixture and call for help from others.

2. What if there is a traffic jam on the way to or from school? (1) Floods, road collapses, or roads are cut off by the waist, and rapids pass. At this time, can I only stay in a safe place? Temporary asylum? , absolutely can't pass by force: (2) When roads in mountainous areas are blocked due to landslide accumulation, they should bypass the mountain and pass through the upper part of the landslide surface, which is safer. (3) When the bridge and culvert are washed away by the flood, the river is rushing and the bridge deck is still collapsing, you must never risk crossing by force, otherwise your life will be in danger; (4) When the high-voltage tower topples and the wires are perpendicular to the road surface, first, stay away from it to prevent electric shock; Second, report to the relevant departments and repair them in time. At this moment, we must not muddle through.

3. How can pedestrians effectively defend themselves when trapped in a rainstorm? (1) In case of rainstorm, pedestrians should not be in a hurry, and arrive at higher-lying houses for temporary refuge as soon as possible. Remember not to take shelter from the rain in bridge opening, buildings with telephone poles, trees and eaves. (2) If the rainstorm has passed barefoot, you can explore the road with branches to avoid falling into the sewer with missing manhole covers. (3) Pay attention to roadside poles, transformers, light poles, etc. during the progress. If any wire falls into the water, bypass it. (4) When riding a bicycle, pay attention to observe and ride slowly, get off early in case of any situation, and try to avoid the stagnant road surface and avoid underwater obstacles or potholes.

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