"According to the scale of Cao's army's additional troops, it is a little difficult to fight!" Xiangyang, sitting on the almost hardened city wall, Liu Yi held a weed in his mouth, feeling the thrilling feeling of being ten feet above the ground, such a city wall, it is not an exaggeration to say that it is the first in the world, right?

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

"No wonder Kong Ming doesn't want to join you." Liu Yi took the chicken leg, took a bite, glanced at Pang Tong's eyes and said: "If Kong Ming is here, he will definitely feel the strength of this city wall, the depth of the artistic conception, the distance of his vision, and the open-mindedness of his heart." ”

That is the demeanor of a master, even if there are no soldiers and horses officially stationed in Xiangyang City now, but what does it mean for you to carry the table and run to the city wall to eat big fish and meat? If there is a real war, this is called shaking the morale of the army.

"Nonsense, he thinks I'm talented!" Pang Tong has been with Liu Yi for a long time, and he has also learned a lot of Liu Yi's verbal terms: "Besides, then Kong Mingsheng has a good appearance, he is going to the toilet here, and you will all feel that the fairy wind is good." ”

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

Pang Tong glanced at Liu Yi disdainfully: "Then you put down the food in your hand?" ”

Liu Yi disdained to be familiar with him, turned around, swung his feet outside the city wall, and looked in the direction of Cao Jun in the distance while swaying, naturally he couldn't see anything, but he was thinking about the latest information in his mind.

Cao Jun went south, and the contact with Sun Quan became more and more frequent, which made Liu Yi a little worried, once Lu Su died, whether Jiangdong could still take care of the overall situation, this has to be a question mark.

Although I think it is impossible for Sun Quan to be stupid at this time, what if he is really stupid?

"You didn't just call me here for a meal, did you?" Liu Yi looked at Pang Tong with some doubts, just eat, and what to do on the city wall if he has nothing to do.

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

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

Look west!

Liu Yi looked west, didn't see anything, frowned and looked at Pang Tong, but saw Pang Tong hiding behind the female wall, wiping his mouth, and wondered: "What? ”

"Wet water." Pang Tong said.

"Which one?" Liu Yi was puzzled, although the place to the north of Xiangyang is empty, there are also many tributaries such as Han River and Chushui, standing on the ten-zhang high city wall and looking at the past, the ghost knows which one Pang Tong is talking about: "Show me." ”

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

Liu Yi turned his head and glanced at Pang Tong, who had always been hiding behind the female wall, and suddenly narrowed his eyes: "Shiyuan won't be afraid, right?" ”

"Afraid of what?" Pang Tong wondered.

"I'm afraid of heights!" Liu Yi said firmly: "Why don't you probe out and look at the city twice." ”

Pang Tong: "......"

"Ha~" Liu Yi laughed strangely, as if he had discovered some terrible secret, Pang Tong, who looked quite oppressive, was afraid of heights!

Although this is not a funny thing, but thinking about Pang Tong's usual dragging, and many times his domineering performance, now he is cowering on the wall and does not dare to look down, there is really an inexplicable sense of joy, just like a man with five big and three thick and three rough and fierce looks standing on the rainbow bridge and screaming.

"Ahem~ get down to business!" Pang Tong naturally didn't prove anything, and being afraid of heights is not an unsightly thing, he has been afraid since he was a child, what's so funny about this.

"You say!" Liu Yi nodded solemnly, but the muscles on his face trembled a little: "I promise not to laugh." ”

Pang Tong looked into the distance through the female wall and said: "The flow of water in this area is gentle, but in the upper reaches, it is quite turbulent, I wonder, can Bo Yuan build a dam upstream?" ”

"Dam?" Liu Yi frowned: "You want to attack with water?" Cao Jun won't find out? ”

"Yes, if it is built again in wartime, even if Cao Jun can't find the dam, he will find problems according to the level of the water, but if the dam is built while Cao Jun has not yet arrived, wait a few months, Cao Jun will come, I'm afraid I just think that the water potential is like this, and to lead Cao Jun into the gully, the only way to do it is to use a stupid way." Pang Tong said with a smile.

In fact, it's not a stupid way, predicting that Cao Jun is coming, using the water potential here in Xiangyang to store water in advance, and when the time is ripe, a fatal blow is a very clever mental application, after all, human beings will get used to the things around them, and this is how it was at the beginning, but they won't feel strange.

Liu Yi accurately threw the leftover chicken bones into Pang Tong's wine buds, nodded and shook his head, and said to Pang Tong with an angry face: "It's not easy to cut off the flow and cut off the water, I'll try it, whether it can be done is not guaranteed." ”

Of course, if you just throw some stones down to temporarily block the water flow, it's no problem, but to build a dam, it's not about throwing stones to block the river, you have to intercept the flow first, or divert the water away, and then empty the silt at the bottom of the water, and then start building the embankment, and the dam has to be able to control it freely, which is more troublesome, in the past, Liu Yi did more thinking about how to use water power as a driving force, this kind of dam gave Liu Yi some inspiration.

If you build dams on several nearby rivers such as Hanshui and Chushui, and then gather several streams in one place and open the sluice gates in turn, the water power provided is far greater than that provided by the slow flow of a river on a normal day.

There's a head!

After thinking for a moment, Liu Yi turned around and jumped down from the women's wall, and Pang Tong's eyelids jumped.

"I'll try, you ordered someone to transfer me five hundred strong men, and I will use them." Liu Yi took another wine bud on the wine table, poured the wine to the brim, drank it all, sighed comfortably, and looked at Pang Tongdao.

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

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

"Five hundred people is enough?"

"Enough!"

I can do it when I think of it, but for now, I have to build the dam first, and the rest will be talked about later.

In the afternoon of the same day, Pang Tong brought Liu Yi five hundred sturdy men, but Liu Yi did not immediately use these people, data these things, he still needs to measure first, estimate the approximate materials, it is not difficult to build a dam, but if he wants to use cement to build, he must first lead the tax exemption to other places, but at this time, there is no need to irrigate farmland, if this water flow is allowed to flow, it will only flood, and the long-term interruption of the water flow is also easy to be discovered by Cao Jun.

Liu Yi's idea is to go around in a circle, free up a distance, let the water flow go back again, and when the dam is built, then bring the water back, although it is troublesome, but safe.

Pang Tong followed Liu Yi for the past two days, saw Liu Yi writing and painting by the water river, and let people try the difficulty of soil excavation nearby, starting on the third day, the five hundred people began to dig the canal, Liu Yi spent money to hire people, do this kind of manual work, the speed is not satisfied, about the total length of the canal is only two miles, one zhang deep, two zhang wide, it took a month to complete, and then Liu Yi began to put stones to block the original water, and after the water flow was introduced into the canal, people began to hollow out the silt at the bottom of the river.

A few days later, the silt was cleared and the materials needed to build the dam were delivered.

Liu Yi also designed the dam drawings during this time, began to build the embankment, filled the foundation at the bottom of the water, and spent eight days with bricks and stones with cement, and built a dam about two zhang wide, three zhang long, and two zhang high in the upper reaches of the water, the dam is equipped with two sluices, which is also the most expensive part of the dam, the whole body is made of copper, and can be freely controlled by the winch to open and close, and decide the amount of water discharged, and at the same time a huge reservoir is dug around it, the length and width are about 100 zhang, if the reservoir is full of water, The water flow will automatically flood the dam and flow into the river from above, once the gate is opened and the water is released, most of the water in the entire reservoir will be released from the gate within a day, according to Liu Yi, if the Cao army dares to set up a village downstream, the water in the reservoir will not completely destroy the Cao army, but also completely collapse the Cao army camp!

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

After another three days, the dam was completely completed, the water flow was redirected, and the water in the reservoir began to accumulate, according to Liu Yi's calculations, three days would be enough to fill the reservoir.

It's just the attributes of the dam that make Liu Yi frown a little, it's not too bad, it's not too mysterious, it's just that what makes him curious is, why does this dam have attributes that affect the weather?

Robust Dams: Rock Solid +39, Water Potential +38, Climate Improvement +36, Hydro Storage +37, Soil Erosion +17 Ecological Destruction +16

Soil erosion and ecological destruction at the end should not be considered good attributes, right?

Liu Yi's brows furrowed slightly, he had tried to replace the attributes several times, but these two attributes could only be reduced, but they would not be replaced, that is to say, the dam itself had a similar effect, and no matter how awesome the system was, it was impossible to eliminate these two attributes.

"Amazing!" Pang Tong naturally didn't know Liu Yi's inner activities at the moment, and looked at the dam in front of him and couldn't help but exclaim.

"I don't know if it's right or wrong." Liu Yi came back to his senses when he heard this, sighed, and tried twice without giving up, and the two attributes were weakened to +15, and it would be difficult to go down, this may be the limit.

Pang Tong glanced at Liu Yi suspiciously, and didn't know why he said this: "What did Bo Yuan say? ”

"Nothing." Liu Yi shook his head, looked at the sky and said, "It's not early, let's go back first." ”

"Hmm."