As the commander of Shuiheng, who was highly anticipated by the emperor, Du Shi is actually better at using water conservancy rather than controlling floods.

In order to live up to the emperor's trust, he has read many books related to flood control in the past few years, such as the long-standing "Yu Gong Tu", the "Shan Hai Jing" collected and compiled by Liu Xin, and the "Records of the Grand Historian: Book of Hequ" which made a major summary of the ditches from ancient times to the Wu Dynasty of the Han Dynasty. The fifth reunification also lets go of Tianlu Pavilion, allowing Du Shi to search for useful information.

Du Shi saw this story in the Classic of Mountains and Seas: In ancient times, floods were surging. Gun stole the Emperor of Heaven to block the flood and was executed. After Gun's posthumous son Dayu became an adult, he inherited his father's business and continued to fight against the flooded rivers, and also used Xirang.

He was curious at that time, what kind of magical object was this Xirang? In another erudite book, Du Shi found the answer.

It is said that Xilan is built into an embankment, which can grow by itself as the water level increases, endlessly, so it can be blocked from floods.

Du Shi was both yearning and regretful. The nightmare of the flood came again. The Yellow River raged the world for more than 20 years, but Xiran had long been buried in the fog of ancient times. No one could tell clearly its origin and where it went, let alone its use.

However, the fifth reunion has a completely different view. He once said to Du Shi: "Although the ancient storm cannot be found, then we can use our intelligence to create the present storm!"

He did what he said, and he really made "Xilan". This thing was made of more clam ash and clay on the beach, and could also be made of limestone. When mixed with appropriate water, it became a very soft slurry. When it was dried in the sun and air, the strength of the slurry increased sharply, losing its plasticity, and becoming a tight solid that could not flow. When Du Shi touched it, it felt like he was touching a hard stone.

If it is mixed with sand and gravel, this "Xiyuan" can tightly glue it together and become a solid whole. The whole process can be described as a word invented by the fifth reunion...

“Coagulation.”

That's right! It's concrete. This plaster slurry that looks ordinary can construct walls with hardness comparable to stone in a short period of time. The fifth reunification directly regarded the "Tokyo Palace" that was about to rise from the ground as a test site. He asked the craftsmen to collect clam shells, limestone, etc. to fire them here, and then mixed them with clay in different proportions to mix "Xilan" with different functions.

The emperor smiled and said to Du Shi: "I think that there must be many of them that can be used when controlling water."

It's more than just useful, it's so useful!

Du Shi was quite excited and said to the fifth eun: "Your Majesty, in the past, water control was built in the second year of Yuanfeng of Emperor Wu of Han. He used firewood and bamboo baskets made of Qiyuan bamboos and put them in stones to block the broken mouth. Although the two "Gourd Songs" above and below are majestic, bamboo trees are easy to rot. They can be as short as half a year, and for a few years, they will inevitably be decayed. The stones are no longer bound, and they will be dispersed by the water, and the broken mouth will be dangerous."

"In ancient times, the construction of the Dahe embankment was originally a rammed earth embankment. However, even if it was built again, the earth walls were soaked in water all year round, and it would be soft and peeled off. By the Han Dynasty, I began to build the stone embankment. I personally walked along the old road of the Dahe River, from Henoi to Liyang, from Henoi to Pinggang, Dongjun to Jinbei, from the northeast to Zhaoyang, from Weijun to Zhaoyang, all of which were stone embankments. However, the stone embankment was difficult to pile up tightly and had many pores. In addition, the silt accumulation of the river over the past few hundred years, and it was getting higher and higher. This is why the river often broke down."

The plasticity of this "Xiyuan" is comparable to rammed earth. Its hardness and no fear of water can be compared with stubborn stones. The fifth relationship undoubtedly gives Du Shi a great weapon!

This made Du Shi, who was still worried, suddenly become confident. The next day, after staying up all night, he reported to Di Wulun a more detailed plan for river management.

"During the reign of Emperor Cheng of Han, Jia Rang proposed three strategies to govern the river, middle and lower."

Du Shi said: "The worst strategy is to repair the old embankment on the bent river of the river, increase the embankment twice, and do minor repairs. However, this strategy is full of labor and expenses, and it can only maintain decades of peace. It turns out that twenty years later, the river broke its mouth."

"The policy is to pass through the canals more frequently and divide the water level slightly, which can last for at least a hundred years."

"The best strategy is to give up Jizhou and the low-lying areas along the coast of Qingzhou, move millions of people to break the river by man-made decisions, and let the river flow from the new road into the sea."

It sounds like this best strategy is a big joke, and it is no different from lying flat and drowning, but we have to consider the reality of the late Han Dynasty: After thousands of years of siltation, the Yellow River has become a river on the ground, blocked by the dam along the coast. In fact, the water surface has long been higher than that of a house. It is like a sharp sword hanging above the heads of the world. Even if the worst strategy is to repair and repair, even if the middle strategy seeks profit and avoids harm, it will still explode sooner or later!

"So Jia Rang thought that although this move would destroy the city, land, and tombs, it would be enough to solve the danger of hanging rivers. The river will ensure the people's safety and safety, and there will be no danger for thousands of years."

Du Shi said sadly: "It has been more than twenty years since the river broke, and the river water can no longer return to the old path. Instead, he found a new path in a low-lying place. Although it was still unstable, it flooded ten thousand mu of fertile land and countless cities, causing millions of people to die in exile, but it did work as a best strategy for Jia Rang."

At least the unsolvable "river on the ground" is finally gone. This is really the most costly "premium strategy", but it also gives the fifth reunion a chance to start all over again!

"Everything has its beginning. I think that the management of the river will begin with the Bian Canal."

Du Shi presented the sketch he drew, and the fifth reunion asked him to step forward, and the monarch and ministers lay on a table.

This Bian Canal is actually the upper stream of the Ganggu, which is divided into the southeast of the Yellow River and finally flows into the Huaihe River system. However, since the Han Dynasty, due to the flooding of the Yellow River, it often invades tributaries. Among them, the Ganggu and Ji River are the most harmful. The imperial court can repair the dam pipe when it is maintained. However, since the Xinmang chaotic times, the Ganggu has become a child without a mother. The turbid water pours in, and the mouth of the Xingyang Canal is down, forming a wide water marsh.

The fifth reunion nodded: "Honggou is close to Zhongjing Luoyang, and there are more than a dozen nearby counties. It produces a lot of grain, so it must be ignored. It is also related to the transportation of military farms in Huaibei, so it must be considered first."

If you want the Yellow River to run honestly on the new road, you must not only beware of its invasion of the Ji River, but also strangle the possibility of its invasion into the Huai River through the gap and strangle it to death in the bud. Although the fifth reun was fighting with Liu Xiu, he did not want to use water instead of soldiers.

Du Shi reported that the biggest problem in managing the gap is the entrance of Xingyang Canal, which is a diversion point, and there is a gate to control the amount of water entering the Bian Canal.

He used the book script on the case table to make an example, adding stones to the earth dam to connect it with the Yellow River embankment, leaving only a gap of more than a few meters wide, and stuck with thick wooden boards as a sluice gate. When the Yellow River water is too much, the gate is opened and when there is too little water, it is closed to control the flow of the gap.

"When building this canal dam and sluice gate, Xilan can come in great use!"

Du Shi excitedly imagined that since Xilan is so plastic, it can not only reinforce the embankments in key areas, but also use it to make "concrete gates" to replace the perishable wooden doors!

"As long as the entrance of the Xingyang Canal of Honggou can be repaired, within a thousand miles of downstream, all canal outlets can be used to use this method to slightly divide the water level so that people can irrigate the fields. This will make the salt and brine wet, increase silt and fertilizer, plant wheat and rice, and make it easier to transfer boats and boats, turn harmful rivers into beneficial rivers, enrich the country and safe people, and promote profit and eliminate harm."

Of course, this is just a medium-level project with tens of thousands of people, and each state can afford it, but the real test is a big project that even the fifth reunion is trembling!

"The most urgent thing now is to make the new road of the river stable, so we should rebuild the dam along the river by using the method of burrowing the river."

Du Shi held a pen and drew a line on the map. From Sili Xingyang to Qianchenghaikou, where they are now, a long dike must be built to protect water.

Wu Lun narrowed his eyes, looked at the line several times, and asked Du Shi: "How many miles are there in total?"

"Roughly estimated, it's more than a thousand miles!"

That is the Great Wall of more than 400 kilometers, and it is not one, but two!

They must stand in the river, just like guarding against bandits, and store this giant dragon that likes to twist! Only in this way can the river channel behind them bends straight, cut and straighten, chisel high to bottom, and make the river more smooth, etc., have the possibility of continuing.

It would be an extremely spectacular project. The Yellow River embankment in ancient times was built bit by bit over a thousand years. The Han Dynasty only connected the river embankment of Zhao, Wei and Qi in the Warring States Period.

But now, it is rising from the ground! Starting from scratch! Even if you use cement, it is difficult to smooth out the huge consumption.

Wu Lun sighed and said, "No wonder you said that it takes hundreds of thousands of people to cure the flood, ten years of hard work, and billions of money!"

Not every ruling person can make up his mind to do such a big thing. Emperor Cheng of Han, Wang Mang, and even emperors of the peace era before them must have faced such moments. But everyone retreated and stopped before such a huge challenge without knowing the result. They would rather choose the worst way to repair and make up for the minor repairs and leave the problem to future generations to "solve".

Peace and fashion are so peaceful, not to mention that the country has not yet been unified and the treasury is still empty?

Du Shi also knew the difficulties and said earnestly: "But if this can be done, the river can be peaceful for hundreds of years!"

"Hundreds of years?" The fifth reun thought for a long time and finally smiled: "Don't talk big, go and do it. Xirang will give you manpower, money, silk, grain and fodder will give you. Before unification, you will repair the two items of Honggou and the Heji Stone Dike for you."

"As for the future, I will support you, please work hard. If you can do it in your lifetime, even if you give me a thousand-household marquis, how can you be regretful??"

After saying that, Wu Lun patted Du Shi on the shoulder and left the hall.

Du Shize bowed later. He was not jealous of the promise of "Thousand Houses Marquis" issued by the fifth reunion... Well, it was indeed a huge incentive. After all, according to the Great Wei system, a civil official, a technician, a man, even an earl, may be a man, or even an earl, but the marquis is still valuable.

"I am willing to spend my whole life to accomplish this!"

Du Shi made an oath in her heart.

"Let the river be within our dynasty, and do not break the verge."

...

People feel happy when they are happy. In the summer of the fourth year of Wude (28 AD), it is not only the place to settle Tokyo, but also the river management has been settled. In June of the middle of summer, when the fifth unit visited Puyang in Dongjun, the third good news also followed.

Wang Hong, the governor of Yanzhou, came to report that under the vigorous relief of wasteland and farming in the prefectures and counties, the Red Eyebrow thieves in Taishan County lost the support of the people around them. Because of lack of food, they went down the mountain to plunder and were trapped in a small town by Ju Wuba. The Red Eyebrow's last leader Xu Xuan was in a foreign and foreign situation and was finally willing to surrender to the Wei army.

Not only that, when he heard the last few words in the letter, Feng Yan, who was quite bored along the way, stood up from the bed!

"The clerk Fang Wang walked through the princes and persuaded Zhang Bu and others to join forces to fight against Wei. Later, when our army attacked Lu, he hid in Mount Tai with the Red Eyebrow. Now that Xu Xuan surrendered, he will also capture and offer him!"
Chapter completed!