Please ask me to be the emperor

Now that we are here, is there any reason to give up halfway?

After Zhang Shun saw the mouth of Guanghui Canal, he asked Zhang Jinyan to lead everyone to the "diaoerzui".

When Zhang Shun got closer to the mountain and took a look, he realized what the situation was like.

It turns out that the so-called Diaoerzui is actually a mountain in the canyon upstream of the Jinghe River Pass.

The river there is rippling and the water is abundant.

"There is an old legend that if you open your mouth, there will be water in every corner of the kitchen."

Zhang Jinyan couldn't help but point to the mountain and said to Zhang Shun: "From here, dig a cave to the north. It is less than a mile away and it will take several years to complete. From here, Jing water will be diverted for irrigation, which will benefit all generations!"

Are you kidding me?

Zhang Shun almost laughed out loud when he heard this. The Guanghui Canal took 17 years, but it only took 279 steps to open the stone canal and 288 steps to open the stone cave. The total of the two is less than one and a half miles. .

Now you tell me how many years it took to dig through this mountain with a diameter of more than a mile?

After all, Zhang Shun was born in the construction industry in his previous life and has an intuitive feel for the amount of work.

If you put aside your previous life and go straight to machinery and explosives, let alone this small mountain bag, you will let him level the entire Zhangjiashan. As long as the funds are in place, everything will not be a problem.

But in this era, let alone shield machines, there are no excavators or earth-moving trucks. How can you dig a cave that is more than one mile?

Just relying on manpower, it took nearly twenty years to dig through the mountain. Who knew that the Jingshui River would not continue to cut down and be abandoned again?

"No, no!" Zhang Shun shook his head and said, "It's a waste of a lot of manpower and material resources, but it will only be a benefit channel for decades!"

"If we build a dam, we can completely solve the water level problem, but we are worried about siltation."

"What if we build a cofferdam and restrict the water channel to raise the water level?"

"It won't work either. The faster the river flows, the faster it cuts the water channel!"

"Wait, lift everything?"

Zhang Shun couldn't help but have a flash of inspiration. He squatted on the ground, picked up a stone, and started writing and drawing on the ground.

When I was in class in my previous life, the teacher once told about Dujiangyan, a classic hydraulic project in ancient China.

As time went by, Zhang Shun almost forgot all the details. But he remembered a basic principle of Dujiangyan: "46% water, 28% sand."

In fact, due to the different geography and terrain, even if Zhang Shun knew all the details, he might not be able to replicate Dujiangyan.

But Zhang Shun learned something from it.

Since the river water flows faster, it cuts downwards, and the river water slows down, siltation occurs. What if the river water is neither fast nor slow, forming a balance of erosion and siltation?

Just when Zhang Jinyan and others looked puzzled, they were all confused for a moment as they watched Zhang Shun write and draw, saying words that seemed to understand but not understand.

Just then, I suddenly heard Zhang Shun ask: "In what year will Guanghui Canal be officially opened for irrigation?"

"It was built in the 17th year of Chenghua, about 150 years ago." Zhang Jinyan counted for a long time with his fingers.

"In one hundred and fifty years, it will be cut down to more than six feet, and every year it will be cut down to four points. It is so powerful, no wonder Guanghui Canal was abandoned in one hundred and fifty years!" Zhang Shun got the data, calculated it orally, shook his head and smiled bitterly. road.

"I already know the reason. The solution lies in the river and not in the canal. If we only focus on the mouth of the canal, even if it costs the people of the five counties nearly twenty years, it will be in vain!"

"How do you say this?" Zhang Jinyan couldn't help being shocked when he heard this.

The dispute between introducing Jing and rejecting Jing did not start with Zhang Jinyan alone. In fact, as early as the 11th year of Jiajing, the Neo-Confucian scholar Ma Li proposed to "cut a canal from the "Cao'er Mouth" to reach Guanghui."

During the Wanli period, Yuan Huazhong, the magistrate of Jingyang County, wrote the "Discussions on Opening Diaoerzui", vetoed the plan of opening Diaoerzui, and advocated "rejecting Jing to divert springs".

At this point, the two sides argued endlessly, so much so that in the original history, during the Qianlong period of the Qing Dynasty, they argued several times, and finally Emperor Qianlong ruled that "rejecting Jing to divert the spring" was the correct solution.

As a result, Zhang Shun opened his mouth and played a game of "in the river but not in the canal". How to convince the crowd?

Zhang Shun couldn't help but laugh and said: "There are two shortcomings in Jingshui River, so it is a water diversion problem."

"One said: The water is rushing downwards, and within a few years the river level will be lower than the mouth of the canal."

"Second: It's very sandy. The water diversion channel will clog up the channel over time and has to be dredged again."

"Both of these are diseases caused by Jingshui, not canal water. Do you think so?"

After hearing the words, Zhang Jinyan pondered for a moment and couldn't help but admire him: "The King of Qin is truly a heavenly man. I carefully thought about it and compared it with what I saw and heard in the past. It is indeed the case!"

"I just don't know how to resolve this matter for the benefit of all generations?"

No matter how nice you say it, the key is one sentence, how to solve it?

"I already have a countermeasure for cutting the river down and raising the mouth of the canal." Zhang Shun smiled and said, "It's nothing more than the four words 'repair the cut with sinking sand'."

"What is 'sinking sand and making up for the cut'?" Zhang Jinyan couldn't help but be stunned.

"The Jingshui River comes out of the valley. The difference between the upper and lower levels is too great. The water flow is very fast, so it cuts into the river channel. Over time, the river bed sinks."

"Therefore, the water should be slowed down to accumulate sand to make up for the lack of undercutting of the river bed and make it balanced."

"This... this... King Qin is really a god descending to the earth, making people look up at the mountains and walk around!" Zhang Jinyan himself was very knowledgeable about water conservancy, and he couldn't help being shocked when he heard this.

For thousands of years since the Zhengguo Canal, everyone has been troubled by the sinking of the river water and the troubled by the abundance of sand in the clean water. It never occurred to anyone that anyone could think of ways to stop the sinking with sand and attack the trouble with trouble.

"If this is the case, wouldn't it be necessary to widen the river surface to slow down the water flow?" Zhang Jinyan knew the elegant meaning after hearing the string, and immediately thought of a specific solution.

"That's right, but as a result, river sand still flows into the canals, blocking the canals, and they still need to be cleaned up once every ten years." Zhang Shun couldn't help but regret.

"It doesn't matter, it doesn't matter. As long as you don't dig up Diaoerzui again, King Qin's method is already very good!" Zhang Jinyan couldn't help but smile happily from ear to ear after hearing this. Why should he care about the slight flaws?

Zhang Shun thought about it, but he couldn't solve the problem of water and sand separation, so he finally gave up in frustration.

In fact, Zhang Shun did not know that the excavation of the Zhengguo Canal in history was not as simple as irrigation.

Instead, the Qin State deliberately "filled up the river with water and irrigated more than 40,000 hectares of land."

The so-called "bitten land" is what later generations called saline-alkali land.

The earliest function of Zhengguo Canal was to attract sediment from the Jinghe River during the flood period and improve the original saline-alkali land.

It turns out that the Jing River flows through the Loess Plateau, and the sediment it carries has a certain degree of air permeability and fertility. The Qin State used the Zhengguo Canal to integrate irrigation, fertilization and soil improvement, killing three birds with one stone.

So that hundreds of years later, after people had eaten enough to hold on, some of Zhang Shun's supporters firmly believed:

The reason why the "Qinwang Canal" is not "divided 46% by water and 28% by sand" like Dujiangyan is that the "King of Qin" Zhang Shun deeply understood the permeability and fertilizing effect of Jing cement and sand, so he deliberately designed it like this. Solve the problem of salinization caused by irrigation.

This is exactly why flowers planted intentionally do not bloom, and willows planted unintentionally create shade.