Otaku Engineer in Great Tang Dynasty

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Inside the Hall of Ganlu.

Just when Li Zexuan waited for a long time and was about to find a place to sit and rest for a while, there was a sudden sound of footsteps outside the hall.

Li Zexuan's face turned solemn, and he quickly stood in the hall with his chest in danger.

"Haha! You must be impatient to wait, right?"

Sure enough, it was Li Er who came. Old Li walked into the hall in a hurry, and when he walked to Li Zexuan's side, he said with a smile that was not a smile.

Although Li Zexuan also had this idea in his heart, he would not be stupid enough to say it, and when he heard the words, he quickly cupped his hands and said, "Your Majesty has summoned the minister to enter the palace, and there must be something important to tell me, the minister is in good spirits and ready to listen. Hadith, why are you impatient~?”

"Hehe! You boy!"

Li Er pointed at Li Zexuan with his finger, smiled angrily, then raised his feet and walked to the upper couch.

At this time, a servant came to report: "Your Majesty, Zhao Guogong, Fang Xiang, Du Xiang, Xiao Shangshu, and Yan Shangshu are waiting to see you outside the hall!"

"Xuan!"

Li Er sat on the couch and said solemnly.

After a while, several important imperial officials came in. Seeing that Li Zexuan was also in the hall, Zhangsun Wuji and others were a little surprised.

After the monarch and ministers greeted each other, Li Er nodded to Zhao Song. The latter took out five pamphlets and distributed a copy to each of the five ministers. Li Er said at this time:

"Ladies and gentlemen, this is the excerpt that Li Zexuan presented yesterday, and I asked someone to copy the five points. You can read it first, and after reading it, I will ask questions!"

"No~!"

The five important ministers agreed, and then they all glanced at Li Zexuan imperceptibly, probably thinking in their hearts: If there is Li Zexuan, there is right and wrong!

When everyone looked down and saw the first few sentences of Li Zexuan's memorial, an absurd feeling arose in their hearts. But soon, their faces became serious.

Time passed bit by bit, and there was silence in the hall. Li Zexuan stood silently in the hall with his hands in his arms, secretly guessing that these old ministers would ask him some difficult questions later.

"Huh? You've read it all? Do you Aiqing have any objection to what the Marquis of Yong'an said in the excerpt?"

About a quarter of an hour later, Li Er's voice sounded in the hall.

The five ministers first looked at each other, then Fang Xuanling took a step forward and said, "Your Majesty, the old minister has a few questions to ask the Marquis of Yongan, may I ask?"

Li Er waved his hand and said, "You don't have to be restrained. If you have any questions you want to ask the Marquis of Yong'an, just ask, and Marquis Yong'an, if you can answer them, feel free to answer!"

"I will obey your orders!"

All the ministers in the hall bowed their hands one after another.

Fang Xuanling looked at Li Zexuan at this time and asked, "Dare to ask the Marquis of Yong'an, you said that the water quality of the Yellow River was relatively clear before the Qin and Han Dynasties, do you have any evidence~?"

Li Zexuan stepped forward and replied: "Of course there is evidence! In the past few days, the younger generation and the gentlemen of the academy have read the scriptures and histories of the previous dynasties and dynasties, and found that the records about "Heqing" began in the late Eastern Han Dynasty, indicating that before the Eastern Han Dynasty, relatively speaking , Heqing phenomenon may be relatively common, not an unusual event, so no one has recorded it! Since the Eastern Han Dynasty, the sediment content of the Yellow River has increased, and the turbidity has become even worse, so "Heqing" has become a national auspiciousness and written in history!"

Fang Xuanling pondered for a moment, then nodded slightly and said, "The Marquis of Yongan said in the memorial that if the Yellow River is allowed to become more silt and sand is not cared for, within twenty years, the eight waters of Chang'an will also become turbid?"

Li Zexuan said: "About this point, I believe that the younger generation will not say, Fang Xiang should know better than me, right? What was the water quality around Chang'an City in the previous dynasty? What is it like now? You should care about yourself! "

He has only been through for a year, so naturally he doesn't know the situation of Qian Sui, but Li Gang knows! According to Li Gang, the water quality around Chang'an City is indeed not as good as it was before!

Fang Xuanling, Changsun Wuji and the others looked at each other in dismay, and finally all sighed, apparently tacitly acquiescing to this fact.

Li Zexuan added: "The quality of water quality is related to the lives of millions of people inside and outside Chang'an City. Last year, the cholera outbreak in Chang'an City, although it had nothing to do with the yellow sand in the river, was also caused by the pollution of the water quality. Cholera! The soil we live in now is soft and soft. In the event of a strong wind, the yellow sand will fill the air. In the event of a heavy rain, the loess will flow into the river. If things go on like this, the sediment content in the Yellow River is bound to get higher and higher. No one can afford the consequences!"

Everyone's expressions changed. After all, they still remembered the cholera in Chang'an City last year!

Fang Xuanling paused for a while, then asked again, "Marquis Yong'an, you said that the increased sediment content in the Yellow River will easily cause the riverbed downstream to be too high, and in the event of heavy rain, the Yellow River will burst its banks, but there is such a thing~ ?"

Li Zexuan smiled slightly: "This is natural! Yan Shangshu is good at engineering, he must know this better than me! If Fang Xiang doesn't believe in the younger generation, he can ask Yan Shangshu!"

Without waiting for Fang Xuanling to ask, Yan Lide nodded and said, "That's right! If the Yellow River sediment is allowed to accumulate, the sediment will be deposited in the lower stream where the water flow is slower, and the riverbed will be too high. Over the years, the riverbed will be raised by a No problem! If there is continuous torrential rain, the lower Yellow River will definitely burst its banks! By then, thousands of people will suffer!"

In fact, Yan Lide's prediction is still optimistic. In modern times, the water surface of the Yellow River is more than 70 meters higher than the altitude of Kaifeng City, and it has become a veritable river hanging on the ground!

Xiao Yu asked in a deep voice, "Marquis Yong'an, do you mean that if the court does not adopt your tree-planting measures, the floods in the lower reaches of the Yellow River will become more and more serious in the future~?"

Li Zexuan nodded and said:

"In the past few days, Mr. Li Gang and I have read the local county records of the prefectures and counties in the lower reaches of the Yellow River in the previous dynasties. According to the evidence, from the Eastern Zhou Dynasty to the end of the Eastern Han Dynasty, there were only 20 occurrences in the lower reaches of the Yellow River. Embankment flooding, that is, about an average of one flood every 41 years;

And from the Three Kingdoms to the Sui Dynasty over the past four hundred years, there have been twenty-three floods in the lower reaches of the Yellow River, an average of once every seventeen years! If we don't take measures now, the Yellow River will burst more and more frequently in the future, even so frequently that it will burst every three years! At that time, the money spent by the imperial court on flood control and helping the people would far exceed the money spent on planting trees now! "

Speaking with data and speaking with facts, this is what Li Zexuan, an engineering expert, is best at and likes to do. After these words, the faces of everyone in the hall turned serious.

And Li Zexuan's next sentence was even more shocking, "Before my master died, he not only predicted this year's locust plague, but also predicted that nine years later, the Yellow River would burst its dyke again, and Luoyang City would be completely flooded at that time, and life would be devastated. !!"

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