Spoiling History: Starting from the Three Kingdoms

At this time, Li Shimin sighed again:

It's still easy to fight.

Seeing that Rome could divide the east and west and house four emperors, Li Shimin was just shocked, but in the end it was not incomprehensible.

After all, from ancient times to the present, there are very few people with such a vast territory, I understand.

The most direct problem brought about by the huge territory is the difficulty of governance, and the problems contained in it, if explained by the theory of centers spoken by younger generations, are that the centers are misaligned, which will inevitably cause problems.

How does the central government control and control the situation so that the people in the southeast who are receiving taxes are willing to support the soldiers in the western regions?

This is a difficult problem to solve.

If something goes wrong, the border guards will starve, the people who pay the taxes will be bullied, and the public will be resentful, and chaos will arise.

But at least for now, judging from the history of the Han and Tang Dynasties, the dual-capital system may be feasible.

Judging from the deeds of Rome, the hidden dangers of multiple empires are too great.

However, after all, these problems were relatively far away, and Li Shimin still needed to think about them by himself and get a clue before they could discuss them with capable ministers. Therefore, Li Shimin finally turned his attention to the light screen.

Seeing the word Guangshen again, I couldn't help but sigh:

Spending millions of lives and people to build such a great cause is really... a waste of money.

It is because of Guangshen that countless people died in chaos in the late Sui Dynasty, and their vitality has not been restored to this day.

Li Shimin didn't even dare to think that if the people of the Tang Dynasty could have the fifty million people they had during the Daye years, then why would he need to be so cautious when conquering the Western Regions?

But it was just a fantasy after all. After shaking his head, he focused on these few words about Pan Jixun.

This method of regulating the Yellow River...

Before he finished speaking, Li Shimin felt his sleeve being pulled by someone:

Your Majesty, this method only takes three days for me to verify its effectiveness. If you can prevent and control floods in the Yellow River, please give me your orders!

This paragraph was spoken quickly and urgently, and it was only then that Li Shimin saw clearly that it was Yan Lide who was grabbing his sleeve nearby.

In this case, there seems to be no other option but to promise.

After getting the promise, Yan Lide retreated happily, feeling that his record in the history books would probably add two more lines.

If we say that the simplest way to leave a name in history and educate the people and build a temple is to manage the Yellow River.

But this simplicity is only compared to the long drive straight into Mobei like Champion Hou. If it is really simple, why are the big troubles of the Yellow River always interrupted by small troubles?

Yan Lide is good at architecture, so he has experience in water conservancy. He also knows that the biggest problem of the Yellow River is that the complex river course makes it very difficult to clear the sediment and siltation in steep places.

But now that the light curtain has thrown the key to the method in his face, Yan Lide feels that it would be unjust for him not to seize this opportunity.

Yan Lide was very comfortable, Li Shimin was very satisfied, the monarch and his ministers smiled at each other, and the atmosphere was very harmonious.

Li Shimin will not comment on the so-called livelihood of millions of water workers.

After all, it seems obvious that there are probably other problems that led to Ming Dynasty's behavior that seemed to be due to choking.

As for the specific reason, I’m afraid we won’t know until later.

[First of all, we need to understand a concept. China’s urban planning system has been quite mature since the Western Zhou Dynasty.

As a negative example, it is Rome. Ancient Rome was a typical natural agglomeration city and lacked planning.

The innate environment could not meet later needs. When the population exploded, ancient Roman craftsmen discovered that the terrain was mountainous and the geology was mostly rocky. With the technology at the time, it was impossible to dig culverts on a large scale, so building elevated water diversions was a last resort.

At the same time, during the Qin and Han Dynasties, the ancestors were no longer satisfied with planning a single city and began to try to build an urban agglomeration planning system.

Let's take Chang'an of the Han Dynasty as an example. Chang'an was overwhelmed by the rapid increase in population after the peace of the world. Under the official plan, some functions that could be centralized were quickly transferred to surrounding small towns.

At its peak, there were as many as 57 small towns in the Chang'an metropolitan area. Each of these small towns performed their own duties and guarded the entire Chang'an metropolitan area in an orderly manner.

For example, cities such as Zhengxian and Xiayang have dedicated iron officials to concentrate iron smelting, which is the prototype of today's industrial zones.

For example, cities such as Yueyang and Huixian were located near the river. They were in charge of water transportation and set up huge granaries to transfer to the cities in Chang'an.

There is a salt officer in Lianshao County to supply the salt needed by the capital in Guanzhong; Chuansikong is a new city built directly on the vacant land by the capital's shipbuilding department, hence the name, and it is also a purely functional satellite city.

Naturally, such advanced and complete planning also has plans for urban water diversion, such as the well-known Ling Canal, Zheng Guo Canal, etc. These water conservancy projects firstly provide water diversion canals to meet residents' daily water use. Instead, most people think of them as irrigated farmland. secondary functions.

The most typical one is Longshou Canal, which is 70 kilometers long and located 30 meters underground.

This canal was built during the reign of Emperor Wu of the Han Dynasty. It took nearly ten years to mobilize tens of thousands of people, and finally led the Luoshui River into Chang'an, completing the first underground water diversion canal in Chinese history.

If you compare the Longshou Canal with the ancient Roman elevated aqueduct, you can see at a glance which one is more difficult and which is easier.

After all, most of the elevated aqueducts in ancient Rome were only a dozen kilometers long. Even including culverts, the length of a complete aqueduct would hardly exceed 100 kilometers.

The Longshou Canal, which is entirely underground, is a full 70 kilometers long. As we all know, underground canalization involves the determination of altitude differences, canal path planning, water source selection, geological environment assessment, water flow distribution calculations, etc. , the technical reserves required by both parties are not on the same level.

This construction technology of Longshou Canal is now called Jing Canal. After the Han Dynasty conquered the Western Regions, this technology quickly spread to Central Asia, received wide acclaim and is still in use today. It was named Karez among the people, and its content is listed in history textbooks. It is also described above.

In addition, after the Han Dynasty, the technology related to domestic water among the people has been developing. Nowadays, when film and television dramas are filmed, water collection in ancient times, no matter the dynasty, is a wheel-type bucket, which is somewhat stereotyped.

For example, many people think that pressure wells are an invention of the 20th century, but in fact many wealthy households in the Song Dynasty had already used them.

However, some scholars believe that this quite simple and easy-to-use water collection facility began in the Han Dynasty. However, there is currently no definite archaeological data to support it, and we can only look forward to future discoveries.

Water conservancy projects have also been throughout the history of Chinese civilization. Just like the Great Wall that many people are familiar with, it is not a purely military building, because the characteristic of rammed earth walls is that they are afraid of being soaked by water. The ancients also spent time on this. A lot of thought was put into making the watchtowers and city walls have different heights. Drainage ditches were dug next to the Zhenma ditch, and internal culverts were connected to drain water to one side of the slope. The culverts and drainage ditches were also designed to automatically prevent siltation.

This is one of the reasons why the Great Wall can still stand today. After hundreds of thousands of years of construction lost its military function, its drainage function, which is only a secondary function, is still functioning perfectly to this day, which shows its technical content.

The technical content of the elevated aqueducts of ancient Rome was not even as good as the original concrete used to build the project. This was the real black technology that created the architectural art of ancient Rome.

The huge volcanoes on the Apennine Peninsula provided enough volcanic ash. The ancient Romans discovered that after mixing it with slaked lime clay, it became surprisingly hard after solidification, and thus built many magnificent buildings.

Ancient China is really envious of this. After all, the nearest volcanic ash production site is on Hainan Island, and the labor costs have skyrocketed.

Although there is a downgraded version that replaces volcanic ash with iron slag, its effect is also greatly reduced and is far less effective than volcanic ash. 】

The light screen pictures rotated, and Liu Bei also saw the astonishingly high ancient Roman aqueduct. His first reaction was how could this magnificent thing have no technical content?

But as the final words changed again and again, Liu Bei's mood was full of twists and turns.

After all, just looking at the majestic appearance of this ancient Roman building showed how useful the concrete was, which immediately made Liu Bei's heart itch.

He was even considering whether to write a letter to Shi Xie and trade some ironware.

But when I heard the following recipe, I immediately fell into a state of ecstasy:

Iron slag? I'm waiting for them, and lots and lots of them!