The captives were frightened by these perverted methods of Daqi, and they were unarmed and scattered, even if they wanted to resist, but without organization, resistance was just sending them to death.

As long as they live, no one wants to die, and most people choose to go along with it and concentrate on being a good captive.

At the very least, you can eat two full meals.

This place on the construction site is dangerous for Yang Hao, in order to prevent any hot-blooded elements from rushing over, he is also a mortal in the flesh, and if he is not prepared, he may burp.

For the sake of his own safety, Yang Hao did not intend to joke with his life.

Stepping into the range of the construction site, more than a dozen guards went out of the body with their swords, vigilantly paying attention to the surroundings to guard Yang Hao.

The captives didn't know Yang Hao, but with so many fierce-looking warrior guards, their status was obviously extraordinary.

In order not to make trouble for themselves, the captives lowered their heads and glanced at Yang Hao viciously, and then moved away from Yang Hao's vicinity slightly.

The soldiers in charge of guarding the construction site wanted to come over to salute, but Yang Hao waved his hand and asked them to continue to work on their own, and they patrolled along the embankment that had been built by themselves.

From the beginning of the construction of the embankment to the present, it has taken nearly a month to build a distance of just over 200 meters.

The river embankment built by Yang Hao refers to the flood control embankment of later generations and adopts a figure-eight structure.

The bottom is nearly five meters wide and more than three meters high, and the entire embankment is made of earth and stone.

Thanks to the advent of bronze tools, a lot of trouble was saved for the construction of the embankment.

Yang Hao walked up the embankment along the steps left behind, carefully checked the quality of the embankment, and not only shook his head.

Due to the limitations of materials and time, Yang Hao knew that such a levee would not last long, at most three or four floods like last year's, and the levee would be abandoned.

But with Daqi's current capabilities, this can only be done.

Yang Hao once saw those ancient dikes when he traveled, the kind of dikes that use mortise and tenon structures to connect stone strips together, and that kind of dikes can even be used for hundreds of years and thousands of years without breakage.

If you want to build such a dam, you can't do it with the current strength of Daqi.

The current embankment may be completed in a few months if it is built for several kilometers, but the kind of embankment with good quality may take years just to mine the stone, but Yang Hao is time.

The quality is the next point, Yang Hao can only comfort himself helplessly.

Shaking his head, he walked along the embankment, and saw a group of people gathered in front of him, not knowing what they were discussing.

"It looks like those people from the Ministry of Works!"

Yang Hao Yang Hao was curious, got off the embankment, and walked quickly towards that side.

When the three officials saw Yang Hao coming, they hurriedly came over to salute.

"What are you arguing about?"

Yang Hao asked.

An official unfolded the animal skin scroll in his hand and said, "Chief, if you dig a canal at the same time as the embankment is built, if you do it in the way depicted in the picture, I am afraid it will be very difficult. ”

This picture was drawn by Yang Hao, and after listening to this official's words, combined with the field investigation just now, I understood what this person meant.

To build a canal, a hole had to be dug in the bottom of the embankment, but this was almost fatal to the poor quality.

Yang Hao knew that this was his own negligence, and he only thought about the progress of the project at the beginning, and did not take this into account at all.

Yang Hao frowned and thought for a while: "In this way, this part is reinforced with processed stones, leaving a gap of about half a meter for the purpose of diverting water from the water channel." ”

"With this gap, it's good to know what to do when the flood comes."

Someone asked.

Yang Hao said: "The embankment on both sides of the gap is set aside for the card slot, when there is heavy rain, put the thick wooden board into the card slot, and when there is no flood, the wooden board will be taken out, and it can be worry-free." ”

"Thick planks? If the leader uses this method, how heavy the plank should be, I'm afraid it must have a thousand catties, so heavy, how can the manpower put it in and take it out. ”

An official worried.

Yang Hao said with a smile: "There is no need to worry about this matter, I have my own way, you can continue to dig the canal according to the previous plan." ”

Several officials looked at the drawings suspiciously, and they really couldn't think of what kind of strength they needed to put thousands of pounds of weight down on the embankment several meters high.

Since it was just because Yang Hao said that it could be done, out of trust in Yang Hao, although several officials were curious, they didn't ask much.

The most rare part was solved by Yang Hao, and the rest of their work was simple.

It is not difficult for Yang Hao to lift thousands of pounds of heavy objects, and it is not difficult for Yang Hao to use simple mechanical principles to make a simple crane with a pulley block.

However, compared to this method, Yang Hao actually has a more secure plan in his heart, that is, to use a waterwheel to lift the water up.

It's just that the waterwheel involves more complex mechanical production, and Yang Hao wants to restore the waterwheel, which is not a simple matter.

But he knows the general principle of the operation of the waterwheel, as long as he is given time, there is a good chance that the waterwheel will be made, after all, this is not to fantasize about some kind of machinery out of thin air.

It's just to stand on the shoulders of the ancients to copy, after all, what the waterwheel looks like, Yang Hao already has a clear pattern in his mind.

All that's missing is the details.

The trouble of the canal was temporarily solved, and Yang Hao asked, "Are there any other difficulties?" If there are difficulties, even if they are raised, they must not delay the project. ”

Several people thought about it and shook their heads.

But at this time, an official said, "Chief, there is something I don't know whether to talk about or not." ”

Yang Hao said curiously: "What's the matter, but it doesn't hurt to say it!" ”

The official pondered his words for a moment and said in a deep voice: "We sent out a few people to use canoes to explore the river downstream, and they came back the day before yesterday.

The downstream river was nothing, but they found a magical place.

Downstream of the river, almost a day's away, there was a large lake, and in the middle of the lake there was a piece of land.

After the tribesmen went up, they found that there were many birds living on it, listening to their descriptions, it was estimated that there were almost thousands, and the land was full of bird droppings, and the shore was half a meter thick, which was very magical.

”

"That's true!"

Yang Hao's words were almost shouted.

How did Yang Hao not know the importance of guano, if this thing was true, it would not only solve the problem of fertilization of cultivated land, but it was even very likely that saltpeter would be found there.

How can this not make Yang Hao excited, guano rich in nitrogen, phosphorus and potassium is a natural compound fertilizer.

And this is ancient times, nothing would be interested in guano at all, if this is true, the sandbar in the river that has existed for I don't know how many years, the amount of guano will definitely be astronomical.

Yang Hao's excited heart was sweating.