The most important thing for a city is the drainage system. Only a perfect drainage system can make the foundation stable. As long as the foundation is stable, it doesn’t matter how the surface buildings are. After all, cities in this era are only two or three stories high.

"Although the moat was built wider and deeper, it was a big moat. Not only was it convenient for the people in the city to wash clothes, but the wells in the city did not need to be dug too deep to get water out.

The soil can be transported directly into the city to raise the foundation. If the foundation of the city is raised, the city's own drainage ditches will not need to be built too wide or too deep. After all, with such a small area of ​​the city, it is impossible for there to be much snow or rain water at one time.

We have two-toothed hoes and shovels for digging, we have wheelbarrows and bamboo baskets, and it doesn’t take much effort to transport the soil, and we have enough manpower. Even if we make the moat wider and deeper, it won’t cost much.”

The melted snow made the soil muddy. Wang Zheng walked in front with a bamboo stick, constantly giving Wu Yi instructions. This is what is meant by teaching by example.

Wu Yi nodded from time to time, and if he didn't understand something, he would speak up and discuss it with Wang Zheng. The teacher was not strict. Over the years, Wu Yi had only respected the teacher, but was not afraid of him.

Wu Yi has always believed that being able to study with Mr. Li is the greatest luck in his life.

Wang Zheng smiled bitterly, not wanting to explain so much to his three-year-old daughter, and just coaxed her, "Yuehua, go and accompany mother, or go play with your brother. Daddy has something to deal with."

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In addition to leaving behind 3,000 soldiers to guard against any unexpected events, Wang Zheng sent other students, soldiers and craftsmen to build the city.

After Xiao Yuehua got up at noon and had lunch, she followed Wang Zheng out for a walk to digest the food. She pointed at the snow-capped mountain next to the brick kiln and said, "Dad, that mountain is so strange. The other mountains are all white, but that mountain is gray."

Wang Zheng had no choice but to carry Xiao Yuehua to the general's tent.

Before the ice and snow melted, Wang Zheng continuously sent teams composed of Ba soldiers, students, and craftsmen to various Tubo tribes. There are now more than 30,000 soldiers in the Dari tribe, and there are almost the same number of craftsmen and students.

The snow evaporates from the ground, so the snow on the mountain will be preserved longer.

As soon as the words came out, the smile on Wang Zheng's face disappeared instantly. He squinted his eyes and looked at the hilltop, frowned and sighed: "Things are a bit troublesome."

Wang Zheng stood on the snowy mountain, pointed at the canyon in front of him with his bamboo stick and said, "The terrain here is very good. Let the craftsmen come and check it out. If the mountain is stable, we will block both ends of the canyon to store water.

By the time all three of them arrived, Xiao Yuehua was so bored that she fell asleep in Wang Zheng's arms.

Xiao Yuehua nodded vigorously and then stretched out her hands to Wang Zheng.

Wang Zheng had no choice but to agree, "Okay, if you get bored later, just go to sleep by yourself, but don't cry."

Wang Zheng sighed and advised: "Xiao Yuehua, be good. Daddy is busy with work and it's boring. It's better for you to stay with mom. Mom doesn't have any delicious food."

Wang Zheng said as he walked, "Immediately notify Wang Ying, Cheng Bokang, and the chief of the Dari tribe to come to the meeting. It's just an urgent matter. No need to prepare, just come over."

Niu Laosan raised his head to look at the surrounding terrain and said, "It may be difficult to build ditches in some places."

Considering that many students are still teenagers, Wang Zheng allowed them to do the work for only half a day, and the work does not require them to put their shoulders on. This is to prevent their backs from being damaged and thus affecting their height. That is why Wang Zheng gave such an order.

Wang Zheng nodded and said, "That's true, but it doesn't matter. In places where it's really hard to build ditches, we can just use bamboo pipes to guide the water.

"But I want to follow Daddy. As long as Daddy holds me, I won't be bored."

After the group returned to the camp, Wu Yi immediately arranged for the craftsmen and students to go out and check the terrain of the mountain. Within one day, they got the reward for their preparations: it was possible to build a reservoir in the canyon.

After checking the ground, the group headed up the mountain.

In this case, let's get started. We have enough manpower. The Tibetans alone can send out more than 10,000 people, not to mention that there are even more Ba soldiers who can be deployed.

"Haha, that's because the soot from the brick kiln chimneys drifted over and dyed the mountaintop black."

The water storage in such a large canyon is enough for the people in the city to use. We can build two channels, open and hidden, in the city like the imperial farm did. The hidden channel drains water underground, and the open channel collects water on the ground for daily use."

Xiao Yuehua thought for a moment and asked, "Can't I go with Daddy to deal with things? I'm very smart, very smart, maybe I can help Daddy?"

An open canal would make life much more convenient for the people in the city. The mountains here are covered with snow all year round, so the water source will not be cut off. As long as the sluice gates are well designed and the canal is built lower, there will be no shortage of water in the city."

Xiao Yuehua asked curiously: "Daddy, what's the trouble?"

After the ice and snow melted, the first thing to be built was the brick kiln, and a lot of bricks and tiles have been produced now.

Looking at the three people in front of him, Wang Zheng stopped tapping the table, sighed and said, "At first, I didn't think it through, thinking that this place is the same as Yuzhou, and the coal ash from the brick kiln will be naturally purified by the environment.

Seeing Wang Zheng leaving, Niu Laosan quickly followed with his guards.

The mountains here are covered with snow all year round and there is almost no grass or trees. The coal ash falling on them will absorb heat more easily, causing the snow to melt more.

The consequence of this is that the spring flood will be larger than in previous years, and previous experience will naturally be useless. For example, many Tibetans will set up their tents near the water.

If we follow past experience, the water near the brick kilns this year is likely to be flooded, and the water mixed with coal ash is harmful to the body after all, so even cattle and sheep should find a different place to drink water."

After explaining the reason, Wang Zheng began to make arrangements. He first said to the chief of the Dari tribe: "Tell your tribesmen the news and ask them to drink boiled water as much as possible. Now every household has a coal stove, so it should be more convenient to drink boiled water. Also, pay attention to the drinking water for cattle and sheep. It is best to change the place.

When Cheng Bokang is transporting supplies, he will bring this news to the Tibetan tribes and ask them to pay attention to it to avoid unnecessary losses. If losses have already occurred, we can be responsible for compensation. "