I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

Later generations of the Hetao Plain used to call it the Fortified South of the Yangtze River, because the Yellow River divided into two rivers when it entered the Hetao Plain, one is the South River and the other is the North River. The sediment carried by the Yellow River alluvially formed a plain with fertile land.

Today's Hetao Plain can't meet the standards of the south of the Yangtze River. Liu Tan always thought that it was because the formation time of this plain was too short, the land was not fertile enough, and it was caused by soil erosion. Now it seems... It seems that it is not only are those reasons.

Liu Tan pulled Huo Guang and asked, "At least in Hetao, the northern border country has abundant water systems. Why does it need to rely on precipitation?"

If it relies on precipitation, the northern border country will be cold, not to mention the Hetao area, even the entire northern border country has little precipitation.

Huo Guang said expressionlessly, "Yellow River? It would be nice if the Yellow River doesn't change course frequently."

Liu Tan:? ? ? ?

He knows that the Yellow River has been diverted frequently. Although she has always praised the Yellow River as the mother river, her mother has a bad temper. As far as Liu Tan knows, the Yellow River has been diverted at least eight times in later generations, and she even robbed the Huaihe River.

Every diversion of the Yellow River means that a large number of people have died in floods and many more people have been displaced.

Therefore, water control has been the main theme of this land since ancient times.

But the problem is that in his perception, the frequent diversions of the Yellow River happened from the North China Plain to the mouth of the sea, and every time the diversions were due to the existence of Mount Tai, they bypassed Qi State, so Qi State and Changyi State can be regarded as the most powerful people in the Han Dynasty. The fief of the top wave.

As for the Hetao area, in his impression the route is not often diverted.

Huo Guang looked at Liu Tan's puzzled face, so he asked someone to bring the map, and then pointed to some lakes on the map and said, "Look, Your Highness, this section is from Zhangye to Shuofang. There are many lakes of this kind in the area. People call it an oxbow lake."

Liu Tan nodded: "Yes, tell me why the lake is full of water and lacks water."

Huo Guang asked back, "Does Your Highness know what an oxbow lake is?"

Liu Tan: ...I'm sorry, geography has been returned to the geography teacher for many years.

Huo Guang didn't seem to expect him to know, and explained: "I only recently learned that the oxbow lake was formed because of the diversion of the Yellow River. It used to be a curved river course. After the diversion of the Yellow River, a large amount of water remained here to form a lake. There will indeed be no shortage of water around, but no one knows when the Yellow River will divert."

Looking at the large and small oxbow lakes on the map, Liu Tan felt a little dizzy. If oxbow lakes are formed in this way, how many times has the Yellow River changed its course in Hetao?

With such frequent diversions, although it is not like the North China Plain that every diversion will cause huge casualties, the losses caused are also inevitable, and here is at the forefront of the battle with the Huns. There are not many people, so naturally it will not let Too many people pay attention.

Liu Tan looked at the current area where the South and North Rivers flow through on the map, and suddenly said, "I want to go there again."

Huo Guang froze for a moment: "What?"

Liu Tan said, "I want to walk along these two rivers."

Huo Guang hesitated: "This...Your Highness doesn't have to..."

Liu Tan shook his head and said, "If you don't look at it honestly, there's no way to be sure what's going on. The water system here in Shuofang is so developed that it's inappropriate for the harvest to fail."

Huo Guang stared: "Your Highness will find a solution after walking around once?"

Liu Tan pointed at the map seriously and said, "It's hard to say, I don't know which one is suitable."

Huo Guang:? ? ? ?

Now that things have happened, Huo Guang wants to ask him: Where did you come from?

Listen, is this a human language?Not sure which one is right?That is to say, there are many ways?

Liu Tan indeed has many methods in his mind. After all, the history of the flower growers is basically the history of fighting against the Yellow River. They have fought against this river too many times for thousands of years. Although some methods seem very backward, they may be the most effective. Suitable for the current Shuofang.

After all, if the level of science and technology is not up to the mark, even if Liu Tan wants to build the Three Gorges Dam, he will not be able to succeed.

It's about people's livelihood, Liu Tan basically just walks away, anyway, he doesn't need to pack his luggage, someone will always bring him what he needs.

Originally, he wanted to keep things simple, but this proposal was rejected by Huo Guang.

Not only that, he even asked Liu Tan to lead the army away.

In Huo Guang's words, he said: "The Huns are never dead. Even if they ask for a mutual market, it doesn't mean they won't go south to plunder. Seeing that the weather is getting colder, the worst winter for the Huns is coming. Be careful."

The fundamental reason why Huo Guang didn't stop Liu Tan this time was that Liu Tan went out to do something serious, but it didn't mean he wasn't worried.

Liu Tan thought about it for the same reason, and if the Xiongnu got any news, Wu Shilu was so excited that he immediately killed him again. Isn't he just to add food to others?

He turned around and called Wei Deng over and said, "Let the elite group come with me."

Wei Deng's eyes lit up immediately: "Your Highness, are you going to fight the Huns?"

Liu Tan slapped him on the back of the head expressionlessly: "What nonsense are you talking about? Where did the Huns come from? The elite regiment has been training for a long time, and it's time to go out to let the air go. If you pass it, you should enter the next stage of training. "

Wei Deng froze for a moment: "Is there a next stage?"

He was a little surprised, thinking that training physical fitness was already a long-term career, and it would be enough to train physical fitness well and improve martial skills a little bit. How could he listen to His Royal Highness, this is not over yet?

Liu Tanxin said, "Where is this?"

It's just that he didn't reveal too much to Wei Deng. No matter how much he said now, they might not understand it. Let's talk about it when we come back.

Wei Deng was a little frightened by Liu Tan's meaningful smile. After thinking for a long time, he couldn't figure out what else they missed. In the end, he had to put this matter aside and inform everyone that he was going to follow up with him. His Royal Highness the King of the Northern Territory went on tour together.

The elite group was almost crazy with joy when they heard the news.

God knows how boring it is for them to be bored here for training every day. Before coming, many people thought that they must stay, and after they stayed, they would not have to worry about food and clothing.

But people are always dissatisfied. Not only do they not have to worry about food and clothing now, they also have spare money to subsidize their families, but training like this every day is really too boring, even more boring than farming at home.

Everyone came to participate in the selection with enthusiasm, no matter how hard or tired the training was, they did not complain in order to be able to beat the Huns.

As a result, they felt that they were almost done, and the Xiongnu made peace talks.

The same question happened between the soldier and Wei Deng. Wei Deng followed Liu Tan's example and patted the man on the back of the head, even replying with the same words.

Although the elite group was a little disappointed, they were still very excited at the thought of being able to go out and let the wind go.

Before he left, Wei Deng specially told him to show the results of his daily training. Among other things, he could show the results of queuing up, walking in step and running, right?

There are also horses, they have been training with the horses for a long time, and basically the horses can do what they want without being frightened.

So in order not to lose the chain, Wei Deng gave everyone and the horses some extra training before leaving.

The results are also very good. Liu Tan has already prepared all the armor suits they wear. They don’t need to wear them for training on weekdays. Now they put on black armor suits for the first time and walked out neatly. They lined up on the street. It looked very imposing at the time.

On the day of departure, Liu Tan also wore a simple black and red suit. In order not to look too monotonous, this suit was specially embroidered with gold thread patterns on the cuffs and neckline.

Huo Guang and others who came to see them off saw the cavalry standing there neatly leading their horses, neither the man nor the horse even moved, and they were a little shocked for a while.

When Liu Tan came out, his hand rested on the saber at his waist, and he also had such an imposing manner.

It looked as if the Huns were no match for this team even if they were in front of them.

However, it is not easy to condense such an aura, and it is too easy to destroy it.

As soon as Liu Tan stepped on the car with his right foot, he felt his left foot sinking, and he was almost dragged off. When he turned his head, he saw a black and white dumpling hugging his leg, looking at him pitifully.

Liu Tan: ...