In the spring of the 21st year of Shenwu, King Xue Li Fumu, respectfully sent all the brothers to leave Beijing and return to the vassal state.

At this moment, Zhang Weiqing sent troops again, walked up the Liao River, and entered the capital again.

The remaining Khitans fled and came to the Hulunbuir grassland, where the Khitan Kingdom, led by Yelu, gathered again.

As the Khitans expected, they made sufficient preparations. Zhang Weiqing directly stationed in Shangjing City, even expanded the city, and changed its name to Zhenliao City.

Since Zhenliao City is a grassland area and a capital of the Khitans, it has set up a large number of castles near Zhenliao City, and connected them into a large number of beacon towers.

The Qing, Huai, Zu, Rao and other prefectures near the Liaohe River and Zhenliao City are also under their jurisdiction.

As a result, Liaodong Prefecture was out of date, and Liaoyang was unable to maintain its rule.

Since then, Zhang Weiqing has reported to the establishment of a Protectorate's Office to govern.

The emperor agreed that as a barrier to Liaodong, the Liaohe River was really important, so he established the Liaobei Protectorate.

The first vassal was Hu Yanzan, who made great contributions.

Because of his contribution to the Goryeo incident, Hu Yanzan was granted the title of Marquis of Shunzhou with a fief of 4,000 households.

Yang Wansheng was named the Prince of Pingzhou with a fief of 3,000 households.

The Khitans in the north completely gave up farming and became a real nomadic people. Their battles with the Shiwei people, the Wugu tribe and the Nei Lie tribe were hard to stop.

The grassland is too vast and cold, so the court and the country are not very concerned about the pursuit of the Khitans.

In view of this, the emperor also noticed the weakening of the Khitan threat and asked Liaodong, Liaobei, and Chen Kingdom (divided into the Bohai Sea) to naturalize and subdue the Jurchens in the Northeast region and give lectures.

Therefore, the Northeast Expedition, which lasted for several years, was officially launched.

Emperor Li Jia also realized that the prosperity of Luoyang seemed to have fascinated his eyes.

In view of this, he directly ordered King Xue to supervise the country and serve as a member of the Political Affairs Hall, and began his southern tour with his own ceremonial guards.

He has been to Shandong, Hebei, and Shaanxi, but he has never been to the south, especially the south of the Yangtze River, and he can't help but yearn for it.

With his forty years old, Emperor Li Jia rode a dragon boat and entered the Yellow River along the Luo River.

Although the Yellow River at this time was less than ten meters high than later generations, it was no less than that.

Above the dragon boat, the emperor was condescending, and he could see the villages on both sides of the strait at a glance.

He couldn't help but be shocked: "When this continues, will the Yellow River pile up higher and higher?"

Henan Prefecture is in its heart and has always been the granary of Luoyang. Once the canal is missing, this is the final guarantee.

In history, the Yellow River in the Northern Song Dynasty burst several times and hundreds of thousands of refugees were caused. The loss of national strength was incalculable.

Nowadays, Luoyang has a stronger dependence on the Yellow River, and only by relying on its water transportation can the grain from the south of the Yangtze River be transported.

Therefore, it is urgent to thoroughly manage the Yellow River.

The Yellow River waterway has been basically stable for more than 800 years since the Eastern Han Dynasty. It follows the ancient Luoshui River channel eastward and winds between the current Yellow River and Majia River, and enters the sea south of Binxian County.

During the Five Dynasties, the frequency of overflows of the Yellow River increased significantly, and the separatist melee of the vassal states, even using water to replace soldiers, made the river troubles worse and worse.

According to records, the Five Dynasties had 53 years of history (907 to 960), and there were records of overflow overflow in a total of 18 years, that is, there would be a river disaster once every 3 years.

In this case, what's wrong?

Li Jia was worried.

"When will there be another Wang Jing?"

The lifeblood of the Yellow River must be appropriate.

The further the ship was, the more tangled Li Jia was.

Finally, when he arrived in Bianliang, he finally made a decision to strengthen the Qianli Dike of Wang Jing of the Eastern Han Dynasty on a large scale.

In addition, he also decided to use the methods of Pan Jixun of the Ming Dynasty to control the Yellow River.

As for Huang Qizi, King Xue, Li Fumu, who wrote a letter to use the old river channel, the Yellow River's multiple leaking river channels were rejected by Li Jia.

There is nothing else, the manpower and material resources are too great.

Moreover, the Yellow River is heavy in siltness and sand. If you open a tributary, it will be blocked in a few years. Then it will be blocked again, and then block again...

Treat the symptoms but not the root cause.

Regarding the governor of Heyun and the officials of Henan Prefecture, he said this:

"According to the past, the Yellow River surging, so the wider the Yellow River, the smoother the water flow."

"This principle is indeed, but the Yellow River is not ordinary. Nearly half of the mud and sand are in its water. The more gentle the water flow is, the larger the mud and sand gather. Therefore, the river bank must be narrow to impact the mud!"

"The object is named, bind water to control sand!"

"Your Majesty, the river channel becomes narrower. If the river water surging and breaks through the embankment, wouldn't the collapse be even heavier?"

Henan magistrate Lu Yuqing couldn't help but raise objections.

All the officials were surprised, but the emperor nodded and praised: "This question has come to the point."

"This kind of water binding is naturally implemented in important water sections. In addition, it can also refer to the tributaries from both sides of the river to wash away the silt and sand."

The emperor actually thought there was not enough water in the river and added water. This opened everyone's eyes and secretly hurt him. Can this method work?

Looking at the faces of everyone, Li Jia naturally knew what they thought and thought that this was the method of Pan Jixun of the Ming Dynasty, which was out of date for hundreds of years and proved by practice.

"Master Lu, do you have any questions?"

"Your Majesty, this law is excellent in controlling sand, but it is not helpful for the collapse of the dike. Moreover, replenishing water will intensify the floods of the Yellow River!"

Lu Yuqing couldn't help but raise his head, his eyes were as sharp as a torch, and he said seriously.

"That's right!"

Li Jia nodded and said, "East from Self-Defense Prefecture, the Yellow River is thousands of miles away, and it is dangerous everywhere. Where can I defend it?"

"The river embankment is connected for dozens or hundreds of miles, making the river water more powerful. It can leave a gap in its surging and dangerous places, and build a second and third embankment in the gap!"

"As a result, the water flows turbulently, and a silted lake will be formed between the collapsed mouth and the second embankment. The second embankment is difficult to protect. The third embankment can be re-protected, so that the water becomes a lake and can be suppressed."

To put it bluntly, it is to set the buffer.

Three embankments and three insurances allow the Yellow River water to flow into the control area, reducing losses, and thus protecting most prefectures and counties.

Even when other river sections are in danger, they can actively discharge floods.

This method is much better than building a river channel, saving time and effort.

Scholars may have fools, but none of them are officials.

They thought about it a little and immediately realized that it was a good way.

Letting the Yellow River go where he should go is an excellent way, the key is to save money.

"Governor of Heyun, I will ask you to find out the Yellow River's easy-to-destruction, and then report it to the Henan Prefect, and ask him to build a dam and a flood discharge area."

"promise--"

"Lu Yuqing!"

"I'm here!"

"I will also order you to take charge of the river advisor. The prefectures and counties on both sides of the Yellow River must obey your orders!"

The emperor patted his shoulder and said earnestly: "I will leave it to you to govern the Yellow River!"
Chapter completed!