Through this small episode, Wu Wei found that the young people have formed a strong collective consciousness and can consciously safeguard the interests of this collective. Thinking about it, many of these more than 1,000 young people have been related to fellow villagers or relatives, and these days they have worked together, killed enemies together, and practiced together (Luo Rucai trained them with the drill of the Qi family's army, and exercised every five days) has cultivated a simple team spirit. In addition, Wu Wei provided them with very generous treatment, so that they could support their families, which was even more rare in this year of disaster, compared to the displaced people in the disaster camp who had been in a state of nutrition and semi-starvation for a long time, not to mention that the people in the disaster area were still living a precarious life. All this qiē also made them consciously distinguish themselves from the common people, and there was a faint sense of collective honor.

For Wu Wei, the young people revere from the heart, not only because Wu Wei provides material guarantees, but also because as a modern person, he subconsciously believes that everyone is equal. In this hierarchical feudal society, a school like Wu Wei is unique. In the eyes of everyone, Wu Wei's love for children and respect for the elderly are all from the heart, and there is no condescending superiority of the bureaucrats and gentry, which makes them regard Wu Wei as their own in their hearts. There are also some people who are a little more knowledgeable, such as Luo Rucai and others, who regard this as Wu Weizhi's great expression, and they are even more attentive to him. And Wu Wei's appearance is really good, tall, handsome, at first glance, he has an extraordinary background, either rich or expensive, which makes people feel awe, but he is also an approachable character, this is the so-called leader temperament.

However, the incident of the displaced people stealing seedlings also reminded Wu Wei that the number of displaced people in the disaster camp is growing, and there will be incidents in the long run. After the Cao Yun incident, Wu Wei came up with an idea: since there is water in the Yan River, why not organize the disaster victims to build water conservancy and irrigate the farmland on both sides of the river, so that the labor force of the disaster victims can be used so that they will not be idle, and the disasters caused by the great drought can be mitigated. Unexpectedly, when discussing with Li Bantou, Zhao Zongjia and others, everyone shook their heads, it turned out that the Yanhe River was low, and most of the fields on both sides of the river were on high ground, so they could not irrigate themselves, so they could only rely on shoulders to carry water.

Wu Wei also considered using a large water pump to pump up the river water in the lower places, but the pump can only use diesel here, once or twice, and it is not realistic to maintain large-scale irrigation for a long time, so the best way is to achieve self-flowing irrigation. What to do, if only Qiuqiu were here, he is an agricultural expert, there will definitely be a way. Thinking of Qiuqiu, Wu Wei suddenly had an idea, Qiuqiu can't come over here, you can take a picture of the situation here for him, why are you so stupid?

Just do it, Wu Wei was led by Zhao Wenzhuo and found a hill near the county seat of Ansai. When he climbed to the top of the mountain out of breath, he looked around, and saw that the surrounding terrain was unobstructed, Wu Wei couldn't help but be overjoyed, and took out HuaweiP6It was a wild shot. By the way, the reason why I use my phone to take pictures is because its pixels are just right, which can not only take pictures of the terrain environment clearly enough, but also not leak secrets that should not be leaked because the resolution is too high. As for Zhao Wenzhuo, he has long been accustomed to all kinds of strange things that Lord Wu often takes out.

Returning to the modern era with the photos taken, Wu Wei washed up as usual, changed into pajamas, and sat on the bed with his legs open his Apple MacBook. He first exported the pictures in his mobile phone, picked out a few satisfactory ones, and used drawing software to indicate the farmland above, rivers, hills and other terrain, and then called Qiuqiu, explained his intentions to him, and sent the photos on QQ.

After a while, Qiuqiu replied on QQ: "I read your picture, you are asking how to achieve artesian irrigation of farmland in higher places, right?" Wu Wei hurriedly said: "Yes, but it's best not to use high-power pumps, it's too power-consuming, and it's best to save if you can save in the countryside." Ball fairway: "It is easy to achieve self-flowing irrigation without pumping pumps, just use the siphon principle." It then details how to use the siphon principle for artesian irrigation.

Wu Wei listened carefully to Qiuqiu's commentary, asked questions from time to time, and after a while, he actually understood seven or eight points. Since ancient times, if you want to solve the irrigation problem of farmland in high terrain, there is only one way, which is to build a dam to block water, and artificially raise the water level until your water level is higher than that of farmland, and naturally realize artesian irrigation. However, not to mention that the construction of a dam on the Yan River is extremely laborious, and the small county of Ansai cannot afford it, even if Ansai has the ability to build a dam, I am afraid that the downstream Yan'an Prefecture, Fushi County, and Yanchang County will not do it, because it will cut off the north-south transportation and reduce the amount of water downstream. Modern agriculture, on the other hand, has long since invented irrigation methods that use the siphon principle, which is much simpler and more effective than building dams. The premise of this method is that the altitude of the water level in the upper reaches of the river is higher than the altitude of the fields in the lower reaches, and this usually happens because the height difference between the upper and lower reaches of the river is relatively large. Irrigation pipes connect upstream high-altitude rivers with downstream low-altitude fields, and water can be pumped from the upper reaches to the lower downstream fields. Once the irrigation pipe is filled with water, even if the pump is turned off, the river water in the irrigation pipe will still remain artesian due to the siphon principle.

This method is more widely used in Henan, Shaanxi and other places, because the riverbed of the Yellow River in the two places has been raised year by year in modern times, and has become a hanging river on the ground, so it is very common to use this method to take water from the Yellow River and cross the dam to carry out artesian irrigation on the low-lying farmland on both sides of the dam. However, this method was not possible in ancient times, because it required a fairly large and well-sealed pipe, and the first step required filling the pipe with water, which can only be done by modern pumps.

Understanding this principle, Wu Wei asked Qiuqiu again to take the photo he passed on as an example of how to lay pipes to achieve artesian irrigation. The ball gives several possible options, but how to implement it requires field measurements of the actual elevation of each point on the map. This is not difficult, modern technology is developed, and the barometric altimeter can be bought everywhere in outdoor stores, but it is only about 100 yuan. Wu Wei asked what type of PVC hose should be used, how to connect the two hoses and many other questions, and asked some questions that even Qiuqiu had not practiced, and the two discussed together to find the answer.

In the next few days, Wu Wei and Zhao Wenzhuo surveyed the terrain on both sides of the Yan River in the late Ming Dynasty and measured the altitude. Zhao Wenzhuo has never worn such lightweight, sturdy and elastic shoes, and he loves them so much that he can't wait to take them off when he sleeps.

The effort paid off, Wu Wei finally found a suitable pipeline laying route, from the upstream altitude to attract river water, for the downstream south bank of the field to supply water, the altitude difference of about 10 meters, the length of the pipeline needs to be more than 1200 meters, if successful can solve the corresponding water supply point near several villages, hundreds of hectares of farmland irrigation and related people and livestock drinking water problems. Wu Wei then ordered Li Bantou to recruit manpower among the victims, dig a two-foot deep pipeline pre-buried trench according to his scheduled laying route, and bury the 100MM PVC corrugated telescopic hose ordered from the manufacturer here in Hyundai and cover it with soil to prevent the people from accidentally destroying the pipeline. There is no need to go into detail during the laying process, such as transfer, welding hoses, etc.

When the pipeline is laid, one end goes to the upstream water intake point, and the other end leads to a long-abandoned irrigation ditch on the high ground on the south bank downstream. This irrigation ditch was originally built during the Hongwu period, but it has long been abandoned due to the diversion of the river, and most of the supporting irrigation canals have collapsed and been abandoned, but if there is a new water source, there is a basis for restoring the irrigation level of the past. This is also the reason why Wu Wei chose to choose the water supply point here, if successful, the farmland around this irrigation ditch will be changed from low-grade dry land to high-grade fertile land!

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