China s water conservancy projects are so strong, why do they still have serious floods?

Flood control is an eternal topic, and no water conservancy project can be done once and for all. The contradictions of things are not immutable, and we must look at problems from the perspective of development. We need to put it from another angle, which is the value brought by the emergence of this water conservancy project, that is, if there is no such facility, then the flood situation will be more serious.

It can alleviate the flood situation to a great extent, and it is wrong to deny its existence if he does not completely control the flood situation.

Looking at some people in front of me who want to laugh, for example, in ancient times, the Yellow River flooded every year, and there was a famous Dayu water control, one of the stories of water conservancy projects.

At that time, the place where the state of Chu was located, now northeast of Anhui, was called Yunmeng Daze, and now it is the Great Plain of North China, the second story of water conservancy projects.

Dujiangyan separates the Minjiang River, creating a fertile field for thousands of miles, and by the way, Li Bing's father and son become a legend, that place is also called Guankou, it is said that Erlang God is Li Bing's son, the third story of the water conservancy project.

Emperor Yang of the Sui Dynasty dug out the Beijing-Hangzhou Canal, and although it was partially silted up due to historical reasons, it is still a north-south artery, and the fourth story of water conservancy projects.

There is little rain in the north, lack of water, sandstorms, the Yellow River is cut off, and the south has abundant water vapor and rain, so there is a south-to-north water diversion, and the Yellow River water system has been much more stable in recent years, and the fifth story of water conservancy projects.

Before the Three Gorges was not repaired, our home was in Anhui, the terrain was not low, in 98 years, the depth of water in my house was about less than 20 centimeters, the disaster outside was very serious, this year in 2020, there was no such situation, why were we flooded that year, because the entire basin was raining, the upstream water storage capacity was poor, and it could not be prevented at all, the more downstream the more the drainage was not smooth, and now the flood peak on the Yangtze River was blocked by several road blocks, and the ferocity was reduced a lot, the sixth story of the water conservancy project.

In addition, in the countryside, the ditches in the countryside themselves are for the convenience of irrigation, and the ditches dug in the past are easy to silt up the soil and are not conducive to cleaning, but now they are only added with cement for easy maintenance, and the functions are different, so it is impossible to talk about sub-projects and the like.

Due to the construction of water conservancy in the central and western regions, the water shortage situation has been greatly improved, and the abundant water resources have been left in the hinterland of the Chinese land, and the direction of water conservancy construction will continue to be adjusted according to this situation in the future, but we must also see that we will have the opportunity to reproduce the ancient Loulan scenery in the future, that is, the source of the three rivers is red flowers and green trees again, and the grass is full of sky, and the more water can be retained in the inland, the better the environment we will have in the future.

Some guys say that the desert is naturally generated for a reason, our country should not prevent and control desertification, it is very interesting, there is still pressure on the cultivated land to feed so many people, since the desert area was a cultivated and pastoral area in ancient times, why can't it be restored now, follow the foreigner to sing this tune, it is really not my Chinese descendants.

Most of China's water conservancy projects are superficial things, except for those few large water conservancy projects, which have a high degree of attention, and naturally invest a lot of manpower, material resources, and painstaking efforts, so that part of the water conservancy can be said to really benefit the country and the people.

But the local water conservancy is not, many of the rural canals and dams we see are not researched and designed, completely follow the original formation of the ditch reinforcement or repair cement to improve, and there is no water conservancy planning and design, to put it bluntly, there are even local water conservancy bureaus in order to defraud the state subsidies and finance, so they will engage in this set, the most failed thing is that most of the following water conservancy does not even have the concept of water diversion and canal repair, such as some provinces, you will find that you go to the actual investigation, In some places, there is enough water all year round, and there will be no water drainage before the arrival of summer, and floods will occur in the rainy season, while in some places there is a perennial drought, and there is a shortage of water all year round, and even crops cannot be planted, and the land is all barren, which is a very common thing in many poor provinces and regions in China, but no one in the water conservancy bureau pays attention to it at all, and no one thinks about how to divert water. To put it bluntly, the Water Conservancy Bureau is a department that eats dry food and does not do practical things.

China's water conservancy projects are not as strong as you think, and at the same time, you must also see that China's terrain is complex, and it is very difficult to build water conservancy projects, but after this year's floods, the country may have to spend a lot of effort to build water conservancy projects.

Exaggerate the propaganda, and it will not work as soon as something happens. Deceived foreign countries, even Chinese people also lied.

We are on a huge sphere, unless human technology can overcome all the unknowns of this sphere, and do a good job of unknown protection in advance. This is the current technology of human beings, but human beings are developing in this direction, whether it is peace or war, human beings are advancing.

The so-called strong is relative, in fact, it is still at the middle level in the world, extreme weather is the main source of flood disasters, and there is still a lot of room for scientific regulation and forecasting to be improved.

No matter how strong the water conservancy project is, if you encroach on the flow channel, the channel through the water becomes narrower, thinner, or blocked, what will be the consequences?

Strong is not the same as total elimination.

Poor understanding of climate phenomena. The climate system is a very complex system, and up to now, human understanding of climate phenomena is still the tip of the iceberg, which leads to the inability to accurately warn and make corresponding emergency measures before the arrival of rainfall, leading to disasters.

The reason is that the weather conditions cannot be easily changed artificially, and we can only adjust to the existing phenomena, but we cannot completely guarantee an absolutely stable state.

China's water conservancy projects are very strong and can be properly adjusted, but this year's global warming is serious, resulting in uneven distribution of rainwater, so drought and flood are seriously harmful.

When the water flow rate is very gentle, it is easy to cause sand accumulation and cause the riverbed to become higher. During the flood season, the flood water is easy to overflow on both sides of the riverbank, resulting in a large area of yellow flooding area, and soaking the dam for a long time, resulting in loose and soft soil of the dam, which is easy to cause dam failure. In addition, a large area of yellow flood area is also easy to lead to the breeding of diseases, causing great trouble to flood control.

Even if there is a sudden surge in water upstream, as long as the dam is not a tofu slag project and can withstand the first wave of impact, the flood peak can quickly reced, and our flood control work will be simpler. My home is just outside the Yangtze River Dam, and it used to be flooded every year. Personal opinion, if there is a mistake, please criticize and point out, thank you.