"Lieutenant Marshal, this is the case, we have found a river flowing from the side of Khan Boten Mountain more than a hundred miles north of the city of Kupila, and we have calculated that if the water from this river is diverted to the outside of the city of Kupiro, it will be able to solve the problem of drinking water for our army." In the tent of the Seventh Corps, Gao Siji sat above, and there was a circle of senior generals of the Seventh Corps sitting around, but in the middle was a small soldier of the logistics team, very young and in his early twenties. The group of generals in the handsome tent made the young man a little uncomfortable, and he stammered a little when he was nervous, but what he said made everyone stand up suddenly. Gao Siji asked directly: "Do you have any good ways to say it quickly, if it is feasible, I will immediately report to the marshal and ask for credit for you." It was not surprising that the young man thought of drinking water from the side of Khan Bo Teng Mountain, because the main source of water for the city of Kupila was actually this river called the Black Horse River, which was different from the White Horse River, which used to flow to the west of the city, so the area that flowed through it near the northwest was named the Black Horse River. However, compared to the White Horse River, the flow of the Black Horse River is much less, but because it is in the high water season, the amount of water is barely enough for the huge number of people in Kupila City. But the problem is that the wells and canals have been basically repaired by the Uighurs from the side of the Hema River to the city of Kupila, so do you need to grab the wells and canals? But even if you grab the well canal, there is no good way to move it to the side of the Tiance army camp? If it's that simple, then why do you need to stay for so long? There weren't many good ways to build wells and canals in the desert on the Seventh Corps' side. So thinking of this, Gao Siji and the others' faces darkened. At this time, almost all the forces of the Uighurs were gathered in the city of Kupila, plus the reinforcements sent from the Samani and Qarluq sides, plus the combined forces of the various tribes on the Shule side, the total of the miscellaneous is estimated to be nearly 300,000 people, although not all of these 300,000 people were hoarded in one place in Kupila, and most of the coalition forces and other relatively weak armies were actually placed in Gumo Prefecture, but there were more than 100,000 people in Kupila City alone, and there were only a few months of construction together. In order to concentrate their efforts on the construction of the Kupila Desert, the Uighurs forcibly sent all the people and other property management personnel in the city of Kupila to the rear of the city of Asyan and other places, and the entire city of Kupila became a huge fortification, lying on the edge of the Kupila desert, blocking the advance of the Tiance army. If the problem of water is not solved, relying on the transportation of water from nearby water sources, the logistics capacity of the Tiance Army is basically consumed on the transportation of water sources, and even if it is so, it can only barely solve the current drinking water problem of these people, and it is no longer able to increase new troops.

"Lieutenant Marshal, that's right, we have urgently transported a batch of cement pipelines from the rear, relying on this kind of pipeline, we don't need to find a way to build any wells and canals in the desert to divert the water of the Heima River to the east where our camp is located. More than 100 miles is 50 kilometers, and a pipeline of 3 meters can be connected to almost 170,000 pipes. The logistics department organized some prisoners of war and the logistics team to haul them together with horses and camels, and now the first batch of 50,000 has arrived in Baicheng, and they can directly go northwest from Baicheng to the nearest place to the river. The young man chattered a lot and said: "Our captain has already gone to find the commander, and General Shi of the Modao Battalion will send troops to escort us over, so that both sides can start construction at the same time, and if the construction period is fast, it can be completed within ten days." ”

"Zhang Gong, are you sure you can finish it in ten days?" Although Gao Siji didn't understand why he had so much confidence, and didn't even ask what was going on, it didn't prevent him from hearing the last sentence and thinking about the follow-up.

Zhang Gong is this young man, he was originally a water conservancy engineer, this time he was sent by the logistics department and the water conservancy and environmental protection department to survey the northwest water conservancy terrain, originally planned to make a map of Anxi hydraulic resources distribution, but did not expect to solve a huge problem for Gao Siji here. The cement pipe he said is actually the cement pipe of the sewer that has been very popular in the construction of inland cities at this time, after Li Xuanqing took Chang'an City as a model for municipal engineering in the country, the sewer became popular in various cities across the country, and the epoch-making weapon of cement pipe naturally Li Xuanqing did not give up, because the manufacturing difficulty is very small, so the output is very large. After the construction of a small cement factory on the sandbar side of the northwest, Zhang's proposal had a basis for implementation.

"Wu Si'er, you immediately dispatch two battalions of troops to follow the logistics department, follow Zhang Gong's instructions, and find a way to solve the water source problem. I would like to tell you that the only way for our army to win the battle of Kubera is not when to attack the city, but to solve the problem of water. Therefore, from now on, Zhang Gong, you are the largest officer of my Seventh Corps and even the entire Western Expeditionary Army, and everyone, including me, is at your disposal at any time, and anyone who disobeys the order will be dealt with directly by military law. Gao Siji saw Zhang Gong's serious nod, and immediately knew that he had a complete plan in his heart, so he didn't say much, and directly ordered Wu Si'er to lead two battalions of field troops to assist Zhang Gong and the logistics team to set off immediately, and began what was later known as the glorious journey of water conservancy development and water resource mobilization in Northwest China.

Zhang Gong began to move, under the protection of the army, demarcating the nearest route, digging ditches along the way, and avoiding the higher places along the way, because at this time the power pump was still lying in the laboratory for testing, so Zhang Gong could only use the terrain to make the water flow self-flowing. However, when he was moving, the whole army of the Modao Battalion on Wan Yi's side dispatched a team of 50,000 prisoners of war who came to transport cement pipelines, and a transport brigade with more than 100,000 war horses and camels also set off from Baicheng to the Heima River Valley, where another water conservancy engineer Liu Sheng was in charge. After choosing the highest altitude of a river, the pipes were quickly laid, ditches were dug to bury the pipes, and then they were connected one section at a time. The two sections of the pipeline are directly connected with a brutal plastic diaphragm and cement, which is actually not long-lasting, but considering that the army does not have much time, the construction team wants to connect the pipeline to water in advance, and then use other methods to bridge it after the military completes the task. After nearly 100,000 people were constructed and transported at the same time, a steady stream of cement pipes was laid and began to extend to the front. On the first day, it directly paved a distance of nearly ten miles. After learning that the construction was going smoothly here, Liu Xuan immediately dispatched almost all the logistics forces behind him and began to transport a large number of cement pipelines to the construction site, and the first batch of animal power to be transported also left and returned after the second batch of cement pipelines arrived at the site. Relying on this method of connection, this method of pipeline water transportation took shape quickly on the front line, and it was able to advance at a speed of more than ten or twenty miles almost every day.

When Wan Yi and Gao Siji went all out to prepare for the construction of the wartime water pipeline, they were actually far away in Liangzhou, Hexi Province, and Li Xuanqing and Zhang Quanfu were also discussing water conservancy construction in the northwest. However, because he and Qiaoxi don't know much about this aspect, they can only tell Zhang Quanfu about it as a suggestion, and how to implement it still needs to be weighed by him, the helmsman of the Ministry of Water Resources and Environmental Protection. But what he didn't expect was that he had just made a suggestion, and the two young people in the far northwest had already thrown off their arms and started to use it directly in practice, and the actual effect after that had a good effect. Especially after the end of the war, Zhang Gong and Liu Sheng joined forces to use plant dead branches and even those crop straws near the pipeline to create the best windproof and sand-fixing grid sand fixing network along the domestic railway, so that Li Xuanqing directly saw the hope of the railway through the desert.

However, at this time, neither Zhang Gong nor Liu Sheng felt that their actions in the near future would even alarm the supreme ruler of the empire, and specially recruited them to the palace to talk to them about the method of wind prevention and sand fixation in the northwest. At this time, they are doing their best to fulfill their promises to Gao Siji and Wan Yi. In addition to the continuous transportation of cement pipelines from the rear, they also need to be able to quickly dig suitable ditches to avoid or eliminate those high-altitude slopes and hills along the way, so that the entire pipeline route can be walked from high to low. Moreover, in order to prevent possible destruction by the Uighurs, the field troops led by Wu Si'er not only had to cooperate with Zhang Gong and the logistics team to dig ditches and build ditches, but also needed to guard against possible sneak attacks by the enemy at any time, so the wartime atmosphere under the yellow sand made Zhang Gong, who had never fought before, even a little inexplicably excited.

But at this time, Liu Sheng, who laid the pipeline from the source of the river to the side of Kupila, did not have so much thought, because he had to carry the main amount of work, and it was not important to lay the pipeline and dig the ditch before joining Zhang Gong and them, so the laying task of more than ten miles a day made everyone exhausted. In August, the high temperature in the desert in the northwest during the day can even reach more than 40 degrees, and at night it may drop directly to more than 10 degrees below zero, not to mention such a huge temperature difference, not to mention that those prisoners of war or the logistics team construction team and even the field soldiers of the Modao battalion could not stand it, and a large number of soldiers and prisoners of war fell ill in this alternation of cold and heat. But because this was the key to the Kupila campaign, Shi Jian continued to intensify the construction almost without blinking, sending all the sick soldiers and prisoners of war to the rear headquarters, and then replenishing new personnel. In this way, almost regardless of the cost, on the fourth day, Zhang Gong and Liu Sheng's two engineering teams will meet, so that the speed is greatly accelerated, because Zhang Gong and Wu Si'er have dug the ditch here, and the rest only needs to lay the pipeline into it and then connect the connection and then wait until the cement dries up and solidifies, you can continue to move forward directly, the two confluence construction team alone has reached nearly 100,000 people, and the speed of laying is naturally much faster than before, and these people have no time to check whether the joint is leaking in order to save time, directly cover the yellow sand to bury the pipeline. Fortunately, Zhang Gong thought of it, so he inserted a benchmark on each connection point to facilitate future search and maintenance. After a little discussion, Wu Si'er and Shi Jian began to divide labor, with Wu Si'er cooperating with the construction team, and he took the Modao Battalion Brigade to turn back to meet the team of the transportation pipeline, so as to prevent the shortage of cement pipelines caused by the delay of the transportation team as the day before yesterday.

Time passed day by day, watching the pipeline gradually approach the end, Gao Siji also began to deploy the remaining two battalions at the front, blocking the road to the east of Kupira City to prepare for the next big battle. And Wan Yi's side decisively stopped the Modao battalion after Shi Jian came back, and sent the 11th Corps to take over his task.

On the ninth day, in fact, the main task of the pipeline has been completed, Zhang Gong and Liu Sheng began to build a complete set of drinking water supply system around Daying, and built countless small pipelines leading to various functional areas directly in Daying through cement. In this way, the complete water supply measures are complete.

On August 18, the fourth year of the Apocalypse, Liu Sheng, who rushed back to the source of the Heima River, connected the last section of the pipeline to the river, and a large amount of river water was instantly injected into this 137-mile-long water pipeline along this section of the pipeline, only to see a huge whirlpool appear on the originally gentle river surface in an instant, and a large amount of river water disappeared into this pitch-black channel. In order to increase the amount of water supply in a short period of time, Liu Sheng directly dug a large pit in the water in front of him and gathered all the river water here. In this way, the disadvantage of the shallow course of the northwest river was solved by him.

The water rushed out after passing through a hundred and thirty-seven miles of pipes, and immediately arrived along the new cement channels that Zhang Gong had built, which were much smaller. Countless shouts began to sound from all over the camp, and the problem that had plagued the Seventh Corps for nearly a month was solved, and many soldiers even shed tears while holding this cool water. With the water source desert there is vitality, the desert yellow sand can be conquered by human beings, looking at this clear water, Gao Siji is also full of emotion, but also more touched by the science and technology advocated by Li Xuanqing, these people in the army have not come up with a way for so long, but they have been done by these young people, and the other party is a talent cultivated by new education.

Seeing that Zhang Gong and other people of the construction team were excitedly thrown into the air by the soldiers, cheers rose and fell in the camp, Gao Siji also laughed, and as a result, the bowl of cool river water handed over by the guards was drunk, wiped his mouth and smiled: "The desert yellow sand waves are surging, the soldiers are marching west to meet the waterway, Changxin Tiangong can be beautiful, and the world is dark and quiet everywhere." ”