Inside the Temple of Manna.

Just when Li Zexuan was waiting bored and was about to find a place to sit down and rest for a while, there was a sudden sound of footsteps outside the main hall.

Li Zexuan's face was solemn, and he hurriedly stood in the main hall.

"Huh! You kid must be impatient, aren't you? ”

Sure enough, it was Li Er, and the old Li Long walked into the main hall in a hurry, and when he walked to Li Zexuan's side, he said with 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 this, he hurriedly arched his hand and said: "Your Majesty summoned the minister to the palace, there must be something important to tell him, the minister is in good spirits this time, ready to listen to the hadith, how can he be impatient~?" ”

"Huh! You kid! ”

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

At this time, an inner servant came to report: "Your Majesty, Zhao Guogong, Fang Xiang, Du Xiang, Xiao Shangshu, and Yan Shangshu are waiting outside the palace!" ”

"Xuan!"

Li Er sat on the couch and said in a deep voice.

After a while, several important ministers of the empire walked in, and they were a little surprised that Li Zexuan was also in the hall, and the eldest grandson Wuji and the others were a little surprised.

Then after the monarch and the ministers saluted, Li Er nodded to Zhao Song, who took out five pamphlets and handed one to each of the five ministers, Li Er said at this time:

"Ladies and gentlemen, this is the excerpt that Li Zexuan presented yesterday, I asked someone to copy Wu Fen, you take a look at it first, and after reading it, I will ask again!"

"No~!"

The five important ministers agreed one after another, and then they all glanced at Li Zexuan imperceptibly, and estimated that they were secretly saying in their hearts: Sure enough, where there is Li Zexuan, there is right and wrong!

When everyone looked down and saw the first few words of Li Zexuan's recital, a sense of absurdity arose in their hearts, if it weren't for the wrong occasion, it is estimated that they would laugh out loud one by one like Li Er at the beginning of last night, but soon, their faces became serious.

Time passed bit by bit, and there was silence in the hall, Li Zexuan stood silently under the hall with his hands crossed, secretly guessing in his heart what difficult questions these old ministers would ask him in a while.

"Huh? Finished reading them all? Do you have any objections to what Yong'an Hou played on the excerpt? ”

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

The five ministers looked at each other at first, and then Fang Xuanling stepped forward and said, "Your Majesty, the old minister has a few questions he wants to ask Yong'an Hou, I don't know if it's okay?" ”

Li Er waved his hand and said: "You don't have to be restrained, if you have any questions that you want to ask Yong'an Hou, just ask, Yong'an Hou, if you can answer it, just answer it!" ”

"Your Ministers obey!"

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 Yong'an Hou, you said that the Yellow River was before the Qin and Han dynasties, and the water quality was relatively clear, do you have a certificate~?" ”

Li Zexuan stepped forward and replied, "Of course there are credentials!" In the past few days, the late generations and the gentlemen of the academy have read the scriptures and histories of the previous dynasties and found that the previous record of "Heqing" began in the late Eastern Han Dynasty, indicating that before the Eastern Han Dynasty, relatively speaking, the phenomenon of Heqing may be more familiar and not an unusual thing, 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 the auspicious rui of the country, and the pen is in history! ”

Fang Xuanling stared and pondered for a moment, nodded slightly, and said: "Yong'an Hou said in the recital that if you let the Yellow River sediment gradually increase and ignore it, within twenty years, the eight waters of Chang'an will also become turbid?" ”

Li Zexuan said: "Regarding this point, I believe that the younger generation does not say it, Fang Xiang must know better than me, right?" What was the water quality around Chang'an City like? What is it like now? You should have your own minds! ”

He has only traveled over a year, so he naturally doesn't know the situation in Qiansui, but Li Gang knows! According to Li Gang, the water quality around Chang'an City is indeed not as good as that of the previous dynasty!

Fang Xuanling, Eldest Sun Wuji and the others looked at each other, and finally sighed, obviously acquiescing to this fact.

Li Zexuan said: "The quality of water quality is related to the lives of millions of people inside and outside Chang'an City, and the cholera outbreak in Chang'an City last year has nothing to do with whether there is yellow sand in the river, but it is also because the water quality is polluted to cause cholera!" The land we are in now, the soil is soft, a strong wind is bound to be full of yellow sand, a heavy rain, the loess will flow into the river, in the long run, the sediment content in the Yellow River is bound to be higher and higher, and the consequences can not be borne by the water! ”

Everyone's faces changed, after all, they still remember the cholera in Chang'an City last year!

Fang Xuanling paused, and asked again after a while: "Yong'an Hou, you said that the sediment content in the Yellow River water increases, which can easily cause the downstream riverbed to be too high, and a heavy rain will cause the Yellow River to burst, but is there such a thing~?" ”

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

Without waiting for Fang Xuanling to ask, Yan Lide nodded and said, "Not bad!" If the sediment of the Yellow River is allowed to accumulate, it will be deposited in the shallow part of the downstream current, and the riverbed will definitely be too high, and it will not be a problem for the riverbed to be raised for many years! If there is continuous heavy rain, the lower reaches of the Yellow River will definitely burst! Thousands of people will suffer! ”

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

Xiao Yu asked in a deep voice: "Yong'an Hou, do you mean that if the imperial 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 gone through the local county records of the prefectures and counties in the lower reaches of the Yellow River in the previous dynasties, and it is well documented that in the more than 800 years from the Eastern Zhou Dynasty to the end of the Eastern Han Dynasty, there were only 20 floods in the lower reaches of the Yellow River, with an average of one flood every 41 years;

In the more than 400 years since the Three Kingdoms and the former Sui Dynasty, there have been 23 floods in the lower reaches of the Yellow River, an average of once every 17 years! If we don't take measures now, the Yellow River will burst its banks more and more frequently in the future, even to the point that it bursts every three years! At that time, the money spent by the imperial court on flood control and relief for the people will far exceed the amount of money spent on planting trees now! ”

Speaking with data and facts, this is what Li Zexuan, an engineering expert, is best at and likes to do, and after saying this, the faces of everyone in the hall became serious.

And Li Zexuan's next sentence was even more earth-shattering, "Before his death, my master not only predicted this year's locust plague, but also predicted that nine years later, the Yellow River would burst its embankment again, and Luoyang City would be flooded at that time, and all lives would be destroyed!" ”

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