As soon as Su Hao said this, the lobby suddenly fell into a deathly silence.
Pan Jixun and Xiong Enzheng are not fools. They know very well that the fate of Pan Jixun's current river control method lies in what Su Hao said. When Pan Jixun first proposed the strategy of "confining water and flushing sand", he thought very well.
, thinking that diverting water from the Huaihe River can wash the sediment from the Yellow River all the way to the sea. In fact, the water potential of the Yellow River is very strong, while the water potential of the Huaihe River is weak, which is not enough to completely dilute the water of the Yellow River. The effect of diverting water to flush sand is very limited.
When Pan Jixun first arrived in Huai'an, he presided over the raising of the Gaojiayan Dam in Hongze Lake, making the water level of Hongze Lake higher than that of the Yellow River, forming a gap for sand flushing. But a few years later, as the Yellow River course rose,
The gap between the two disappeared. In order to continue to maintain the strategy of confining water and flushing sand, Pan Jixun had to continue to raise the height of the Gaojiayan Dam. Anyone with a discerning eye can see that this is a vicious cycle. One day, this strategy will be maintained.
Can't go down.
Unlike what Su Hao said, Pan Jixun is not without vision, and he also knows the problems with this plan. But at his age, he is no longer able to come up with a longer-term strategy. Any long-term strategy must be implemented consistently by someone.
As a 70-year-old man, Pan Jixun knows that his days are numbered. If he proposes some strategies that will take ten or twenty years to be effective, who can implement them?
"Su Hao, what are your opinions on river management?" Pan Jixun was silent for a while and then spoke slowly. Different from the previous arrogance, this time, his tone was more sincere. Su Hao dared to
Contradicting Pan Jixun shows that he is not a speculator. The fact that he can point out the shortcomings of the strategy of beaming water and flushing sand shows that he is not an ignorant person. Since these two shortcomings no longer exist, Pan Jixun has no regard for Su
Hao naturally thought highly of it.
Pan Jixun lowered his figure, and Su Hao became humble. He said: "Xiaguan has just been involved in river affairs. He doesn't have any high opinions on river management. He has some foolish opinions behind closed doors. If Pan Gong doesn't give up,
, please allow me to speak out."
"Say it." Pan Jixun said.
Su Hao said: "Xiaguan believes that river management can be divided into two steps: immediate and long-term. Let me talk about the long-term first. In the long run, river management should start from the root. The sediment in the Yellow River comes from the Hetao, and
The reason why there is sediment flowing into the Hetao is that many years of land reclamation have destroyed the vegetation, resulting in a lack of binding of the sediment. When there is a heavy rain, the turbid current will flow into the Yellow River. To make the Yellow River clear, it is necessary to restore the Hetao area.
Vegetation, return farmland to forest, return farmland to grass, and strictly prohibit cutting down firewood. If this continues for decades, it will be effective."
"What happened in the past few decades is that water far away cannot quench the thirst of the near. How can we wait for it?" Xiong Enzheng said.
Su Hao looked at Pan Jixun and said: "It has been 25 years since Pan Gong first started to regulate the river. If Pan Gong could have proposed a plan to restore vegetation in the Hetao, 25 years later, some results have been achieved. I will open the Ming Dynasty
The dynasty has been in power for more than 200 years. If this matter could have been considered 200 years ago, we can now see a river of clear water. How could we have suffered from this disaster?"
Pan Jixun has actually thought about what Su Hao said. He has managed rivers for many years, and of course he has considered the problem of sediment in the upper reaches of the Yellow River. However, his past thinking was that water far away could not quench the thirst of the near, and he always thought about it.
After the immediate matter is resolved, then consider the long-term matter. Now that Su Hao said this, he felt a little regretful in his heart. Yes, if he had accepted the river management task for the first time 25 years ago, he would have
It can promote the soil and water conservation work in the middle reaches of the Yellow River. Even if it cannot completely solve the problem in 25 years, it can at least alleviate the problem to a certain extent.
Thinking of this, Pan Jixun raised his head and said to Xiong Enzheng: "Guangping, please write down these words of Chief Su and write them into a memorial. I will ask the Holy Father to restrict land reclamation and firewood cutting in the Hetao area. We can't see the Yellow River changing.
It's clear, but if we follow Su Hao's method, maybe our descendants will be able to see the day when the Yellow River becomes clear."
Xiong Enzheng nodded quickly and sat aside to record. Pan Jixun turned around and looked at Su Hao. Suddenly, as if he remembered something, he pointed to the chair beside him and said, "Su Hao, please sit down and talk."
"Thank you Mr. Pan." Su Hao bowed slightly to Pan Jixun and sat down on a chair beside him. After he came in and talked to Pan Jixun so much, he finally won the right to sit down and talk, which showed that Pan Jixun was disgusted with him.
It has been eliminated and I started to appreciate him a little bit.
"I think the long-term plan you just mentioned makes sense. So, what is your opinion on the matter at hand?" Pan Jixun also moved his buttocks to make himself sit more comfortably. It seems that
I want to have a long talk with Su Hao.
Su Hao said: "Under the current circumstances, the sedimentation of the Yellow River is unavoidable. Although the strategy of water flushing can alleviate the sedimentation, it cannot cure the root cause. The Yellow River will still continue to rise. We are now using heightening dams
The method used to prevent the Yellow River from flooding is only a temporary measure. When the dam cannot be raised any higher, the Yellow River will still change its course. In my opinion, since the Yellow River is destined to change its course, why can't we allow it to change its course regularly?"
Hearing Su Hao's words, Xiong Enzheng raised his head again and instinctively wanted to refute a few words. However, seeing that Pan Jixun did not have a strong reaction, he had to swallow his words. Su Hao's previous words were all
His words were not surprising, but he did make some sense after he said them. Xiong Enzheng figured it out, and it would be better not to talk nonsense until he understood Su Hao's truth.
Su Hao waited for a few seconds and saw that Pan Jixun and Xiong Enzheng were silent, so he smiled to himself and continued: "Xiaoguan knows that this idea is too shocking. I don't mean to allow the Yellow River to flood.
, but means to prepare a river channel for the Yellow River in advance before it overflows, and then let it change its course and pass through this designated river channel, so that no disaster will occur.
The Yellow River course is raised by an average of three inches a year. We will build a new river course in 30 years when it is raised by about 10 feet, so that the pressure on us to regulate the river will be much less."
"But do you know how much fertile land it will take to build another river channel?" Pan Jixun asked.
Su Hao asked: "Mr. Pan, Huai'an Prefecture has been flooded for two consecutive years. How much fertile land can be left?"
Pan Jixun suddenly became speechless. He had seen the floods in the past two years. When the floods came, many fertile fields were destroyed. This loss was much greater than Su Hao's plan to open another channel for the Yellow River.
Many people have such a stereotype in their thinking. They always think that losses caused by disasters are inevitable, and artificially occupying farmland is a treason.
The plan proposed by Su Hao is based on the idea of breaking the pot and breaking it, or it is called the lesser of two evils. According to this plan, artificially changing the course of the Yellow River every 30 years can guarantee peace for at least 30 years. In fact, it is really
A constant thought.
In fact, during the war-torn years before the Ming Dynasty, there was no strong government capable of managing the river. The Yellow River solved the problem of the rising river bed by irregularly changing its course. Each time it was changed, the Yellow River could be tamed for several years.
When the riverbed resilts to a level higher than the surrounding fields, it changes course again, which is equivalent to clearing the system.
When the Ming Dynasty government regulated the Yellow River, it did not dare to use such a method because the fields on both sides of the Yellow River were owned by owners. A government could not just let the Yellow River change its course to flood these owned fields. But now, the fields in the lower reaches of the Yellow River are
Floods are already frequent in Huai'an, so it is really unnecessary to insist on the dogma of not occupying farmland.
"In your opinion, should we abandon this river channel now and build a new one?" Pan Jixun asked.
Su Hao shook his head and said: "The current course of the Yellow River is not too high. It would not be too late to build a new river and change its course in 10 years. What the official meant is that there is no need to use the strategy of water beams to wash away sand, and the river course can be allowed to rise.
If we give up water-shushing for sand flushing, we don’t need to raise the Gaojia Weir, so Sizhou and Fengyang upstream will not suffer from flooding.”
"The purpose of raising Gaojiayan is not just to wash away sand. The Yellow River diverts the Huaihe River into the sea, blocking the Huaihe River's entrance to the sea. If Gaojiayan is not raised and the Huaihe River floods, what will be done?" Xiong Enzheng finally found a reason to criticize Su Hao.
.
The difficulty of river management is that it not only has to consider the problems of the Yellow River, but also the problems of the Huaihe River. The Yellow River takes the Huaihe River and flows into the sea. The high Yellow River bed is like a wall, blocking the Huaihe River's entry into the sea from west to east. The Huaihe River
The water was trapped in Hongze Lake and could not be discharged, which would inevitably cause harm to the surrounding areas. Pan Ji repaired the Gaojia Weir to raise the water level of Hongze Lake to exceed the bed of the Yellow River, so that the water of the Huaihe River could surpass the Yellow River and flow into the sea. Su Hao opposed the repairs.
Gaojiayan, so how does he solve the problem of water leakage in the Huaihe River?
Su Hao dared to propose this plan, and he was naturally confident. In the era when Su Hao traveled through, China was building a large-scale project called the South-to-North Water Diversion Project, which is a project to divert water from the Yangtze River to the north. The South-to-North Water Diversion Project involved how to divert water from the Yangtze River to the north.
The problem of water diversion channels crossing the Yellow River bed. In later generations, the way to solve this problem was to open a set of culverts under the Yellow River to allow the Yangtze River water to pass under the Yellow River to form a three-dimensional intersection.
Su Hao was inspired by this project. He thought, since the Huaihe River water cannot flow from above the Yellow River, why can't it flow from below the Yellow River bed?
"Let the water of the Huaihe River flow under the Yellow River?" Pan Jixun and Xiong Enzheng were both stunned. This method sounded so clever, but it was also incredible.
"It's very simple. As long as a few large culverts are opened under the Yellow River bed to connect Hongze Lake to the Huaihe River downstream, the problem of the Huaihe River water flowing into the sea will be solved." Su Hao said lightly.
"What should I do if I build a culvert under the river bed or the culvert collapses?" Pan Jixun asked.
Su Hao said: "Since we have to build a culvert, we cannot let it collapse. As long as the quality of the project is acceptable, how can it collapse?"
"To prevent the culvert from collapsing, the cave wall must be built with strips of stone to withstand the erosion of the river all year round. In addition, the stone must be built tightly to prevent water leakage, otherwise water will seep into the gaps between the strips of stone and remain
It will cause the soil outside the cave wall to drain away. To achieve this, the difficulty of this project is unimaginable." Xiong Enzheng said with a frown.
"Xiong is indeed experienced. I admire you very much." Su Hao complimented Xiong Enzheng. The fact that Xiong Enzheng could say this shows that he has seriously considered Su Hao's plan and also has experience in water conservancy projects. The most difficult thing about building a group of culverts under the Yellow River bed is indeed the anti-seepage problem of the culverts. This problem was difficult to solve back then, but with the golden finger brought by Su Hao, a traveler, this problem will not be solved. It's no longer a problem.
"Pan Gong, when Xiaguan built the reservoir in Fengcheng, he used a material called cement. This material is in powder form. After adding water to mix it, it is similar to yellow mud. It can be made into any shape. It is used to plug the gaps in masonry. But after drying, it becomes as hard as stone and can be washed away by water without breaking. The official thought that with this kind of cement, it would be easy to build a culvert across the river." Su Hao laughed. Showed his secret weapon to Pan Jixun. (To be continued. Please search Piaotian Literature, the novel will be better and updated faster!)