"Have you ever wondered why the Yellow River is frequently diverted?" Zhang Zhaohua said, "It's not because of the Vortex River and the Yinghe River. The Yellow River suffers from the lower reaches, the disease is in the middle reaches, and the roots are in the sediment. The sediment content is large, the downstream height difference, the small flow rate is slow, and the siltation is serious, if it is ignored, it will overflow the original river channel and change the flow in a new direction, which is the reason why the Shang Dynasty moved the capital five times. If we build an embankment, we will continue to silt up, and we have no choice but to raise the embankment, and the silt will also increase, and eventually cause the flood to burst the embankment. You look at Kaifeng City, I grew up there, Hongwu Haiqing River Yan, did not encounter the flood, but many old people still remember the Kaifeng flood at the end of the Yuan Dynasty, now it is full of floods, the king of Zhou and local officials have to destroy the city to rebuild, I also heard nursery rhymes when I was a child, said Kaifeng City, the city stacked city, buried several layers underground, Kaifeng like this, do not suffer from floods, once suffer from floods, that is, the catastrophe of extinction. The management of the Yellow River is simply a dead cycle. ”

Zhang Zhaohua looked at Yang Shiqi and listened carefully, thinking that he still had some insight, but he listened to him: "Niangniang, there is only one flood in Kaifeng, it was Wang Ben of the Qin Dynasty who caused the gap to flood the Liang, and the Liang of the Wei capital has since become a ruin, and the son of Wei, Wang Sun, has become a prisoner of Qiang Qin. ”

Zhang Zhaohua glared at him angrily and said, "What about the number of times it has been flooded like now?"

"Then ...... Much more. Yang Shiqi touched his nose and said, "Niangniang continues." ”

"Sediment dredging is the most effective and fundamental way to control the Yellow River. But now...... In addition to harassing water and attacking sand, there is no other way to divert water and sand, and Lin Fang does not follow my method, so she can only dredge by manpower, and tens of thousands of people clean up the silt every year......" Zhang Zhaohua looked at the husband in the distance and said: "What do I think of these people, most of them don't have wives to deliver food?"

Yang Shiqi said: "The people of Shandong are all civil servants, and the land at home can only be planted by women, so how can they have time to deliver food." ”

Yang Shiqi said it so lightly, but the people who said it and the people who listened couldn't help but shake.

Now the imperial city is repaired in the north, Wudang is repaired in the south, grain is transferred from the south to the north, and canals are also dug, and hundreds of thousands of people have been requisitioned and transferred in Shandong. Only in Shandong, it was hit hard and almost died. So after becoming the emperor, he hated the people of Shandong for refusing to attach themselves to him, all the people were drawn from Shandong, and Shandong was never exempted from taxes in all disaster years.

In ten years, there was almost no happiness in Shandong, first war, then exploitation, and all the people Zhang Zhaohua saw were as numb as puppets, just like people without souls.

"Back then, Emperor Gao hated the people of Susong for supporting Zhang Shicheng and set them the heaviest tax," Zhang Zhaohua said in a low voice: "Now Emperor Yongle hates the people of Shandong, so he let every man in every household become a civilian servant - how can this father and son be so similar?"

Yang Shiqi pointed in a direction: "Do you see those two people, they are brothers." ”

Zhang Zhaohua nodded, and Yang Shiqi said: "Their father and mother only have these two sons, but now, the father and son are all on the river service." ”

Yang Shiqi said slowly, because the government assigns service according to the Ding mouth in a household, the household with many Ding will have to bear multiple services, so the people are competing to divide the household.

"In order to exempt the two brothers," Yang Shiqi said: "They have already separated their families, but you see, it is useless, as long as the Shandong government sees a young and strong man, it will arrest and serve." ”

"Shandong Province has actually undertaken the civil service of the whole country," Zhang Zhaohua said worriedly: "I see that this place will ...... one day."

Before she could finish her sentence, a group of people gathered in front of her, one of whom took out a book of scriptures, as if preaching something, and some of them lit candles, all with a look of pinching their hands.

"What are you doing here?" Zhang Zhaohua said.

"These are the followers of the White Lotus Sect," Yang Shiqi said, "and they are preaching." ”

Zhang Zhaohua was surprised: "White Lotus Sect! You will be preached by the followers of the White Lotus Sect in broad daylight!"

"They work hard, if they don't believe in these things in this life and the next life," Yang Shiqi stopped her: "Then they don't have the slightest idea of wanting to live." ”

Shandong is the place where the White Lotus Sect has developed the most, and it also has roots.

Zhang Zhaohua looked at this group of people as if they had been redeemed in the ordinary chanting of the scriptures, and one by one they showed a look of relief, and couldn't help but feel the hairs on their backs stand up: "This is a cult, a cult! How do you know that they are not hoping for an afterlife, but want to change their fate in this life?"

Yang Shiqi explained to her that most of the officials in Shandong knew that the White Lotus Sect had a wide range of followers, but if they wanted to complete their tasks and drive labor, they would turn a blind eye, as long as these people were willing to work. It is also true that after listening to the scriptures, they seem to have a little higher endurance.

Zhang Zhaohua also knew that there was no way to change it now, unless he could change the emperor's mind and ask him to stop punishing the innocent people of Shandong like this. She only felt that this time she was out of the palace, and what she saw and heard along the way made her feel cold in her heart, and it seemed that a deep powerlessness surrounded her, making her helpless.

In the next two days, Zhang Zhaohua, Yang Shiqi and Handong measured the water level and flow, Zhang Zhaohua saw a lot of data, but these data were not processed like a rough house, and some of the data were not accurate, Zhang Zhaohua had to calculate by himself, because the relationship between the water level and the flow of the Yellow River was not stable, so he could not directly measure the flow by measuring the water level.

Simple calculations are handed over to Han Dong and Yang Shiqi, these two people have the same attainments in arithmetic, and even Yang Shiqi is not as good as Han Dong, especially indifferent to multiplication and division, Zhang Zhaohua taught several times and was still blindfolded, she laughed at him twice, thinking that if this person was placed in the next generation, mathematics would definitely be very bad, and he would be a liberal arts student.

The three main equations, the continuous flow equation, the water flow equation and the sediment transport equation, were converted countless times, including the loss parameters and the roughness coefficient, and she finally came to the conclusion that the sediment transport in the river maintained a mean value.

"The estuary is blocked very successfully," Zhang Zhaohua stretched his waist: "To be honest, I have only seen straw silica before, and this kind of willow stalk silica seems to be much more powerful, more scouring and silting than straw si, and it is not easy to rot." ”

Yang Shiqi casually asked, "Niangniang seems to have special insight into river workers?"

The pen in Zhang Zhaohua's hand paused slightly, and she said: "I have a relative, who is a river worker." ”

That's right, one of her relatives in her previous life worked in the Yellow River Water Conservancy Commission, in fact, it should be the Survey and Design Institute, and he had many calculations, all of which Zhang Zhaohua helped complete. Zhang Zhaohua didn't expect that she would remember these formulas one day, the important thing is that she had heard many stories about the Yellow River since she was a child, and everyone else had forgotten them, except Pan Jitao of the Ming Dynasty, and even more fortunately, she remembered all his theories.