This problem is half natural disaster and half man-made, but in this era everyone would only think it was a natural disaster. The Minister of Works threw this question to Wang Zheng, and his embarrassment was obvious.

Everyone had strange expressions. In their opinion, no matter how capable Wang Zheng was, he was still a human being. This could be seen from Wang Zheng's life and appearance. Li Zhi also looked at Wang Zheng with curiosity.

Wang Zheng pondered for a moment and said with a smile: "Your Majesty, you can have two sand tables made and brought up, and replace the sand in the sand tables with loess."

Li Zhi nodded and asked, "Any special requests?"

"A few buckets of water and fresh bamboo branches with leaves on them, and some sawdust, that should be enough."

"Come here, follow the instructions of the chief steward and quickly bring all the things to the main hall."

Li Zhi's tone was somewhat excited. Although the horseshoe just now solved the big problem, it did not show Wang Zheng's ability after all. Even Wang Zheng had many requirements for solving the big problem of this flood season, and it was not solved in just a few words. It seemed that there was something to watch.

Li Zhi nodded and then asked, "What about building reservoirs? This is no small matter. After all, if there are not enough reservoirs built, it will not play a decisive role."

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The things were quickly moved up. The sand table had been promoted in the Tang Dynasty a long time ago, and the general size was ten feet square. Wang Zheng stood up and used a wooden stick to randomly sprinkle a layer of sawdust on a sand table, then drew some grooves on the two sand tables, and then dug some small holes at the end of the grooves on the sand table with sawdust.

As long as there are grass and trees along the coast to protect the soil, the big rivers will not be so easy to silt up. The so-called clear distinction is just the difference in the farming conditions along the two rivers. If you want to manage the big rivers, you must start from the root, so that you can achieve twice the result with half the effort. "

At first, the Minister of Works was still able to take his time, and waited slowly for the eunuch to sprinkle a bucket and a half of water before he began to catch up with the progress. However, under the constant urging of the eunuch who was announcing the time, the Minister of Works gradually became impatient.

Wang Zheng smiled and shook his head, saying: "Whether it is fair or not is not important, because I just want you to understand the cause of the disaster caused by the collapse of the Yellow River dam.

Just now Wang Zheng had only scattered three handfuls of sawdust. Although the bucket was not too big, half a bucket of water weighed more than twenty-two kilograms. Three handfuls of sawdust could not hold more than twenty kilograms of water.

Then Wang Zheng said to the Minister of Industry, "You can do it yourself, so that you won't feel that there is a problem when the situation exceeds your expectations."

He was really unsure, so the Minister of Industry gritted his teeth and nodded, saying, "The chief steward is a natural talent, so it's understandable that I take advantage of him, right?"

"this."

I don't want to win or lose with you. If you mind, how about you win? From now on, you can tell others that you beat me, Wang Zheng."

The Minister of Industry gritted his teeth and continued, "Of course, the sand table with less water will be more stable."

"Does the steward have any requests?"

"Really? Then let's try it."

Wang Zheng smiled at the Minister of Works and asked, "What if we add half a bucket of water to the sand table with sawdust?"

"If this is the Yellow River, the sawdust is grass, trees, etc., and these small pits are reservoirs, do you think that with the same amount of water, the gullies in the sandbox will be smoother?"

"That's not fair. There are puddles on your sand table, so it can naturally store more water. I didn't take that into account just now."

Wang Zheng said to the people who were carrying things up: "Make a gap at the exit of the gully and use branches to sprinkle water on it and try it out."

Wang Zheng nodded and smiled, "It's that simple. The saplings will grow. If we don't prune the branches, the big trees will encroach on the surrounding fields. This is a kind of silent nourishment."

Because he found that after two and a half buckets of water had been poured into the other party's sand table, there was still no sign of collapse in the ditch, while his sand table had already collapsed and been blocked before two buckets of water had been poured into it.

Li Zhi was stunned for a moment, and asked in disbelief: "So simple?"

Li Zhi said hesitantly: "But most of the land along the river is fertile land. It's not easy to restore it to grass!"

Wang Zheng shook his head and said with a smile, "It doesn't matter, just do whatever you want. But in order to avoid wasting time, let's finish spreading these three buckets of water in half an hour. That should be no problem, right?"

Wang Zheng ignored the Minister of Works and turned around to point at the sand table and explained: "With the same amount of water, as long as more large reservoirs are built upstream of the tributaries to store water, the water flow of the rivers can be regulated.

After all the water was spilled, the Minister of Works collapsed to the ground, partly because of tiredness and partly because of frustration.

Wang Zheng shook his head. "No, just be casual. It can be more even."

Wang Zheng was well-known, so everyone was not in a hurry and just waited quietly to see the show. The Tang Dynasty had been stable for a long time, so there weren't many things that could interest everyone.

After the Minister of Works nodded in agreement, they began to sprinkle water with bamboo branches, with a eunuch beside them telling the time every quarter.

"It's easy to plant some saplings. Just send a notice to all the prefectures and counties. The Ministry of Personnel can include this in the evaluation. After all, this is a long-term plan."

"What's there to say? A sandbox with sawdust is naturally more stable."

The Minister of Works immediately perked up. This was within his authority. Reservoirs had to be built at the sources of all rivers. The workload would be enormous, and the interests involved would be innumerable.

"Your Majesty, building reservoirs will benefit the present and future generations. This matter cannot be delayed. It is only late autumn now, and there is still more than a month before the first snow. If we hurry up and build more reservoirs, the disasters in various places will be greatly reduced during the spring flood next year."

What he said made sense, but Li Zhi didn't want to talk to these ministers in recent years. These guys were always planning to take over his inner treasury.

In the past, the treasury did not have much money and life was difficult. Now, the treasury has several times more money, but life is getting harder. Every time there is a court meeting, everyone complains about being poor. Li Zhi actually likes going to court very much, as it can give the people the impression that he is diligent.

The reason why it was changed to every other day in recent years is that people were scared by the way these guys asked for money.