Please ask me to be the emperor

Zhang Shun's ability to provide theoretical basis does not mean that the problem can be solved immediately, but Zhang Jinyan, the magistrate of Sanyuan County, is still very excited.

Because in the past, the "Introducing Jing" faction was always at a disadvantage when arguing with the "Rejecting Jing" faction.

The "Rejecting Jing" faction represents the interests of Jingyang County, so diverting the spring into the canal will not have a great impact on Jingyang and is easy to implement.

But for Sanyuan, Gaoling and Lintong downstream of Jingyang, it is nothing less than a disaster. The good canal water is gone, and the originally good farmland may have to be turned into middle fields or even lower fields. This makes " How to accept the "Yinjing" faction?

Others don't know, so how can Zhang Jinyan not know? It is extremely difficult to dig mountains and divert water from that "Diaoerzui".

Therefore, unlike others, although Zhang Jinyan also advocates "introducing Jing", he actually does not have high expectations for opening the mouth.

The "Yinjing" faction doesn't have a practical plan other than advocating digging up Diaoerzui. How can we not fall into a disadvantage?

But when Zhang Shun proposed "the sinking sand is cut flat and the erosion and siltation are balanced", things developed in a direction favorable to the "Yinjing" faction.

Because it fundamentally solves the problem of constantly digging new water diversion canals once and for all, and completely blocks the "fallacy" of "rejecting Jing water to divert springs" and sending work in vain and not worth the loss.

In fact, if we look at it carefully, the amount of work required to widen the river surface in the valley may not be much smaller than drilling through Diaoerzui.

However, widening the river surface and achieving a balance between erosion and siltation are more feasible than digging out Diaoerzui from any perspective, so Zhang Jinyan couldn't help but be extremely excited.

Originally, the best place to implement Zhang Shun's "sand sinking, smooth cutting, and balance of erosion and siltation" happened to be at the head of the Zhengguo Canal.

The Jingshui River here has just left the valley, and it is simplest and easiest to achieve the goal of widening the river by digging the soil on both sides.

However, the river level at the entrance of the Zhengguo Canal is now too high, and there are no realistic conditions for implementation.

If the next best thing is to go through the mouth of Guanghui Canal, it will be necessary to dig out river rocks on both sides, and the amount of work will be quite huge.

"Do we have to dig out the rocks on both sides of the river?" On the way back, Zhang Jinyan couldn't help but ask after thinking about it for a long time.

"When did I say that I had to dig out the river rocks?" Zhang Shun shook his head and said, "I'm just providing an idea."

"After all, I have so many things to do, I really can't inspect and measure up and down the river."

"We only need two things, one is to slow down the water flow, and the other is to raise the river surface and introduce it into Guanghui Canal."

“If there’s somewhere else to achieve those two goals, that’s fine.”

"If it really doesn't work, I have an alternative solution. Do you want to listen to it?"

"Oh? Your Highness King Qin, please tell me!" After this incident, Zhang Jinyan, the magistrate of Sanyuan County, obviously respected Zhang Shun a lot.

"The urgent task is to adopt a two-pronged approach. One is to widen the head of Guanghui Canal, and the other is to set up a cofferdam downstream of the water intake from the head of Guanghui Canal to confine water and lift the river!" Zhang Shun couldn't help but suggest.

“In the end, we were able to dig out the river rocks on both sides and accumulate them into cofferdams, killing two birds with one stone without any effort!”

"Then the river sand will self-silt. If the water is high, the cofferdam will be reduced. If the water is low, the cofferdam will be increased. In this way, one increase and one decrease will keep the river level as normal."

What does that mean?

Zhang Shun suggested that we simply widen the river surface at the water diversion of Guanghui Canal, and then build a cofferdam downstream of the water diversion without transporting the excavated stones.

The cofferdam narrows the river downstream of the water diversion, which naturally raises the water level upstream of the cofferdam, forming a wide river surface similar to a reservoir.

In this way, because the water flow slows down in this reservoir-like location, the river sand will deposit here on its own.

The sedimentation of river sand will raise the river bed on its own, thereby raising the surface of the Jing River here, which can just in time lead the originally sinking Jing River water into the Guanghui Canal.

However, if the river bed continues to rise over time, it is likely that the dams on both sides will be washed away.

At this time, it is necessary to widen the river mouth restricted by the cofferdam to allow the water flow to wash away the accumulated river sand.

In this way, if there is more river sand, the gap in the cofferdam will be wider, and if there is less river sand, the gap in the cofferdam will be smaller. Finally, a dynamic balance will be formed. There is no need to adjust the cofferdam. The "reservoir" of the Jinghe River can be used here. A balance of erosion and sedimentation is formed.

"Wonderful, wonderful!" Zhang Jinyan couldn't help but clasp his palm after hearing this, "Isn't this just like a water bottle?"

"The cofferdam is the mouth of the bottle, and the widened river channel is the belly of the bottle. If there is less sand, the mouth of the bottle will be restrained, and if there is more sand, the mouth of the bottle will be expanded. In this way, the water and sand can be controlled!"

"In just a few years, erosion and sedimentation will be balanced without any trouble for the people of the five counties. It is really wonderful!"

Just as he was talking, Zhang Jinyan's voice couldn't help but lower.

"No, no!" He couldn't help but frown and said, "His Royal Highness the King of Qin doesn't know something. The Jinghe River has two periods of low water and high water."

"It's the rainy season now, so the rivers surge; in the dry season, the rivers plummet. How can the river levels be controlled with such rise and fall?"

"This" Zhang Shun couldn't help but was stunned when he heard this, and then he realized that there was something wrong with the "erosion and sedimentation balance" model he designed.

I know that I have considered the static river problem but not the dynamic river problem.

"Wait a minute, let me think about it carefully!" Zhang Shun waved his hand and frowned.

The amount of water is large in the rainy season and small in the dry season, rising and falling.

Wait, one rises and one falls?

Got it!

Zhang Shun thought for a long time and couldn't help but smile and said: "This is easy to hear, but the height of the cofferdam must be controlled!"

"These cofferdams do not need to be too high when stacked. When the water is low, the water will naturally be contained. When the river surges, it will naturally overflow the cofferdam and flow as usual!"

Zhang Jinyan couldn't help but be stunned when he heard this, and after a while he said with emotion: "His Royal Highness the King of Qin is really unconventional and unconstrained in what he does. I am amazed and ashamed of myself."

"Having King Qin like this is a blessing to the people of Jingyang, Liquan, Sanyuan, Gaoling and Lintong counties, a blessing to the people of Shaanxi, and a blessing to the people of the world!"

"If the master is so enlightened, why would Lian Yuan dare not to die?"

Lianyuan? Zhang Shun was stunned, and then realized that this should be Zhang Jinyan's handwriting.

It turned out that although this guy had defected to the rebel army and was reliable in his work, in the end he lived up to Wei Zheng's words: "In the end, he is just a stoic but not benevolent; he looks respectful but his heart is not convinced."

But after Zhang Shun's performance, Zhang Jinyan was really convinced and "willing to die for it".

"This method is just a suggestion of mine. It still needs to be verified carefully!" Zhang Shun couldn't help but feel happy when he heard this, and then warned him again.

"Since Lian Yuan is interested, I will leave this matter to you."

"I also ask you to carefully explore the conditions along the Jinghe River and Guanghui Canal after completing your daily work, compile a book of corresponding problems and solutions, and report them to me."

"Everything must be carefully researched and ensured, and then allocate grain and silver, recruit people, and solve the problem of Guanghui Canal irrigation in one fell swoop. There must be no mistakes!"

"I accept the order and thank you!" Upon hearing this, Zhang Jinyan couldn't help but quickly dismounted from his horse, threw himself to the ground, and responded loudly.