"According to the scale of Cao's army's increase, it's a bit difficult to fight!" Xiangyang, sitting on the hardened city wall, Liu Yi was holding a weed in his mouth, feeling the thrilling feeling of ten feet above the ground. It would not be an exaggeration to say that such a city wall is the best in the world, right?

"Hey, if we don't fight with Sun Quan, how could Cao Cao do it?" Pang Tong took a bite of the chicken and handed a chicken leg to Liu Yi: "Come on, try it, it tastes really good."

"No wonder Kong Ming doesn't want to be with you." Liu Yi took the chicken leg, took a bite, glanced at Pang Tong and said, "If Kong Ming were here, he would definitely feel the hardness of the city wall, the deep artistic conception, the farthest vision, and the broad mind."

That is the style of a master. Even if the troops in Xiangyang City are not officially stationed, what does it mean to carry a table to the city wall and eat big fish and meat? If you really fight, it is called shaking the morale of the army.

"Nonsense, he just thinks I am talented!" Pang Tong and Liu Yi have been together for a long time and have learned a lot of Liu Yi's oral terms: "Besides, Kong Mingsheng has a good appearance. Even if he goes to the toilet here, you will feel that he is a fairy-like person."

"..." Liu Yi looked at the fragrant chicken legs in his hand, took a bite, and suddenly felt that the taste had changed a little, and shook his head and sighed: "A common man."

Pang Tong glanced at Liu Yi with disdain: "Then do you put down the food in your hand?"

Liu Yi disdained to be as knowledgeable as him, so he turned around and swung his feet outside the city wall. While wandering, he looked at the direction of Cao Jun in the distance. Naturally, he could not see anything, but his mind was thinking about the recent information.

Cao's army went south and contacts with Sun Quan became more and more frequent, which made Liu Yi a little worried. If Lu Su dies, Jiangdong can still take the overall situation into consideration. This has to be a question.

Although I think Sun Quan cannot be stupid at this time, what if he is really stupid?

"You called me here, it's not just for a meal, right?" Liu Yi looked at Pang Tong with some confusion, and just had to eat. Why did he run to the city wall if he had nothing to do?

"Look at that side!" Pang Tong casually pointed to the direction that he might not even know, stuffed food in his mouth, said vaguely, then raised the wine cup and took it hard, then sighed comfortably, stood up, and came to Liu Yi.

"Which side?" Liu Yi didn't look back at all.

Look west!

Liu Yi looked west and saw nothing. He frowned and looked at Pang Tong, but saw Pang Tong hiding behind the female wall, wiping his mouth, and wondered: "What?"

"Mianshui." Pang Tong said.

"Which?" Liu Yi was puzzled. Although the north of Xiangyang was empty, there were many tributaries such as Han River, Mian River and other tributaries. Standing on the city wall ten feet high, looking over, I knew which Pang Tong was talking about: "Speak to me."

"This... the third line from Xiangyang to the north is not wide." Pang Tong thought about it carefully.

Liu Yi turned around and looked at Pang Tong, who had always been hiding behind the female wall, and suddenly narrowed his eyes: "Shi Yuan isn't afraid, are you?"

"What are you afraid of?" Pang Tong said in confusion.

"Afraid of high altitude!" Liu Yi said confidently: "Or you might as well poke your head out and look under the city."

Pang Tong: “…”

"Ha~" Liu Yi laughed strangely, as if he had discovered some amazing secret. Pang Tong, who looked quite oppressive, was actually afraid of high spirits!

Although this book is not a funny thing, thinking about Pang Tong's usual arrogant appearance and his sometimes arrogant performance, he is now shrouding on the wall and not daring to look down. He really feels inexplicable joy, just like a man with a big, thick and rough appearance standing on the rainbow bridge and screaming.

"Well~ talk about the serious matter!" Pang Tong naturally didn't prove anything. Being afraid of high places is not a shameful thing. He has been afraid since he was a child. What's so funny about this?

"You said!" Liu Yi nodded seriously, but the muscles on his face trembled a little: "I promise not to smile."

Pang Tong looked into the distance through the female wall and said, "The water flows smoothly in this area, but it is quite turbulent in the upper reaches. I was wondering, can Bo Yuan build a dam upstream?"

"Dam?" Liu Yi frowned: "You want to attack with water? Will Cao's army not discover it?"

"Yes, if it is built again during the war, even if the Cao army cannot find the dam, it will find problems based on the water level. However, if the dam is built before the Cao army has arrived, the Cao army will come in a few months. I am afraid that it is just thinking that the water level is like this. To lead the Cao army into the valley, we can only use stupid methods." Pang Tong smiled.

In fact, it is not a stupid method. It is predicted that Cao's army will come, and use the water level in Xiangyang to store water in advance. When the time is ripe, one blow will be fatal. This is a very clever mental application. After all, humans will get used to the things around them. It is like this at the beginning, but they will not find it strange.

Liu Yi accurately threw the leftover chicken bones into Pang Tong's wine cup, nodded and shook his head, facing Pang Tong with an angry face, "It's not easy to cut off the flow and cut off the water. I'll try it. I don't guarantee whether it can be done."

Cut off the flow and water, it is not possible to have materials. Of course, if you just throw some stones down and temporarily block the water flow, it is okay, but to build a dam, it is not to throw stones to block the river. You have to cut off the flow first, or lure the water away, and then empty the silt at the bottom of the water before you can start building the dam. This dam must be controlled freely, which is more troublesome. In the past, Liu Yi did more to think about how to use hydraulic power as power. This dam gave Liu Yi some inspiration.

If several nearby rivers such as Hanshui and Mianshui are built with dams, and then several water flows are gathered together and the gates are opened in turn, the hydraulic power provided is far less than the one river that provides for slow flow in daily life.

There is something to do!

After thinking for a while, Liu Yi turned around and jumped off the female wall, and Pang Tong's eyelids twitched.

"I'll try it. You ordered someone to transfer five hundred strong men to me, I want to use it." Liu Yi held another wine cup on the table, poured the wine, drank it all, and sighed comfortably, looking at Pang Tong.

"Does Bo Yuan have an idea?" Pang Tong looked at Liu Yi curiously and asked.

"Yes, and it's very big!" Liu Yi nodded with a smile.

"Five hundred people are enough?"

"enough!"

I do it when I think about it, but now I can build the Mianshui dam first, and I will talk about the others later.

In the afternoon of that day, Pang Tong brought 500 strong men to Liu Yi, but Liu Yi did not use these people immediately. He also needs to measure the data and estimate the approximate materials. It is not difficult to build a dam, but if he wants to use cement to build it, he must first bring the duty-free to other places. However, at this time, irrigation of farmland is no longer necessary. If this water flow is allowed to flow, it will only flood and disasters. Moreover, the long-term shutdown of the Mian River is easily discovered by Cao's army.

Liu Yi’s idea was to circle around, make a distance, let the water flow go back, and wait until the dam is built, and then lure the water flow back. Although it is troublesome, it is safe.

Pang Tong followed Liu Yi in the past two days and saw Liu Yi writing and painting by the Mianshui River. He also tried the difficulty of digging nearby soil. On the third day, the five hundred civilians began to dig canals. Liu Yi spent money to hire people to do this kind of physical work. The speed was not satisfactory. It was probably only two miles long. It was one meter deep and two meter wide. It took a month to complete it. Then Liu Yi began to throw stones to block the original Mianshui. After guiding the water flow into the canal, he began to hollow out the silt at the bottom of the river.

After a few days, the silt was cleared and the materials needed to build the dam were transported.

During this period, Liu Yi also designed the dam drawings and started to build the embankment. He filled the foundation at the bottom of the water. He spent eight days using bricks and stones and cement to build a dam about two zhang wide, three zhang long and two zhang high upstream of the Mian River. The dam has two sluice gates, which are also the most expensive parts of the dam. It is made of copper and can be freely controlled by the winch to determine the amount of water release. At the same time, a huge reservoir is dug around, which is about hundreds of zhang long and wide. If the reservoir is filled with water, the water flow will automatically submerge the dam flows into the river from above. Once the gate is opened and water is released, most of the accumulated water in the entire reservoir will be released from the gate within one day. According to Liu Yi, if the Cao army dares to establish a village downstream, the water in the reservoir will not completely destroy the Cao army and completely destroy the Cao army camp!

After all, it is not a big river, so it is already good to be able to do this. Moreover, Liu Yi himself thinks that the best function of this dam is to benefit the people rather than harm people. After this battle, he is ready to make full use of the water resources of several nearby rivers.

Three days later, the dam was completely completed and the water flow was drawn back again. The water in the reservoir began to accumulate. According to Liu Yi's calculations, three days were enough to fill the reservoir.

It’s just that the attributes of the dam made Liu Yi frown. It was not too bad or too fantasy. It just made him curious about why the dam had attributes that affected the weather?

Strong dam: as solid as a rock +39, water potential regulation +38, climate improvement +36, hydraulic accumulation +37, soil erosion +17 ecological damage +16

The final soil erosion and ecological damage should not be considered good attributes, right?

Liu Yi frowned slightly. He had tried to replace attributes several times, but these two attributes could only be reduced, but not replaced. In other words, the dam itself has a similar effect. No matter how awesome the system is, it is impossible to eliminate these two attributes.

"Magic work!" Pang Tong naturally didn't know Liu Yi's inner activities at this moment. Looking at the dam in front of him, he couldn't help but exclaim.

"I don't know if it's right or wrong." Liu Yi came to his senses and sighed. He tried twice without giving up. The two attributes were weakened to +15, and it would be difficult to decrease. This may be the limit.

Pang Tong glanced at Liu Yi in confusion, wondering why he said this: "What did Bo Yuan say?"

"Nothing." Liu Yi shook his head, looked at the sky and said, "It's not too late, let's go back first."
Chapter completed!