Successful Dujiangyan
Dujiangyan was built in the last year of King Qin Zhao (about 256 BC - 251 BC), is a large-scale water conservancy project located in Dujiangyan City, Chengdu, Sichuan Province, organized by the father and son of Li Bing, Taishou Of Shu County, after completion, it not only eliminated the flooding of the Min River, but also made the Chengdu Plain a country of fertile wilderness and thousands of miles.
A few years later, the State of Qin started a larger water conservancy project again, and it took ten years. What is the purpose of the Qin State?
background
During the Warring States period, the annexation war between the princes headed by Qixiong was very fierce, and each country was trying its best to develop itself, even if it could not destroy its opponents, at least it could protect itself. After the success of Zhang Yi's strategy of continuous horizontal crossing, the State of Qin adopted the means of long-distance and close-range attacks to continue to divide and encroach on various countries. The State of Qin continued to receive compensation from the princes for the cession of land, becoming the most powerful country and the most likely to achieve the unification of the world.
At this time, Korea was the eastern neighbor of the Qin State, in the land of four wars, after many years of war, its strength had been reduced to the last of the seven heroes, and it could be annexed by Qin at any time.
conspiracy
Under such circumstances, The Korean monarch Han Huiwang pondered the countermeasures and finally designed a plan that he thought was perfect.
He asked Zheng Guo, a famous water conservancy engineer in China, to enter Qin to persuade the King of Qin to build a large irrigation channel, located in the WeiHe River Valley west to east of the Guanzhong Plain, nominally taking Dujiangyan as a successful case, which can promote agricultural development after repair, and its real purpose is to sell well to the Qin State, divert the attention of the Qin State, delay the time for the Qin State to go out of the east, and most importantly, consume the economic strength of the Qin State.
This cannot but be said to be a sinister plan, digging a pit for the Qin state. Is the Qin State in the trap?
King Yingzheng of Qin
In 246 BC, Zheng Guo's delegation came to Xianyang. At this time, Qin Wang Yingzheng was still a teenager who was only fourteen years old, and he had just taken the throne.
I don't know if zheng guo's delegation said that the construction plan was crazy and seamless? Still young and ignorant and ignorant, he was impressed by the loyalty of the Koreans, and such a slightly absurd and unhurried project plan was quickly approved, and Zheng Guo was appointed as the chief commander of the project!
The project is on the way
The Guanzhong Plain, to which the Qin State belongs, is hundreds of miles from east to west and tens of miles from north to south, and is the grain base of the Qin State. The plain topography is characterized by slightly higher in the northwest and slightly lower in the southeast. Jingshui and Luoshui are two tributaries of the Wei River, which flows out of the mountains of present-day northern Shaanxi, joins the Guanzhong Plain, and then flows eastward into the Yellow River. The Beiluo River is a tributary of another Wei River in the eastern part of the plain.
Zheng Guo's project plan is to dig a diversion canal for more than 300 miles, and inject water into Luoluo in the west and in the east. To make it clear, it is necessary to build a trunk canal along the northern foot of the plain that is almost parallel to the Wei River!
From the topographic point of view, the trunk canal is distributed in the highest area of the plain irrigation area, once the jing water flow can not enter the canal smoothly due to siltation, terrain and other reasons, it is in vain to consume time and manpower and material resources; if so, the effect of tens of thousands of people's hard work is equivalent to the yugong moving the mountain!
The plot was revealed
After the construction began, some people understood korea's plan and revealed its true intentions to the King of Qin. Therefore, Zheng Guo's fate is on the verge of death. Zheng Guo distinguished that the original construction of the water canal was indeed ill-motivated, but he wanted to delay time and continue the life of South Korea; but once the water canal was completed, it would benefit the agricultural development of the Guanzhong Plain, and it would be a great contribution to Qin.
Although Qin Wangzheng was young, he did have the spirit of wisdom and martial arts, and he thought that Zheng Guo's words were reasonable and worth a try, so he continued to let him preside over this project. Ten years later, the project was finally completed. Because it was Zheng Guo who designed and presided over the construction, it was called Zheng Guo Canal.
The work of all the worlds
The trunk canal is distributed in the highest area of the irrigation area, stretching east along the foot of the mountain in the north, which is not only conducive to ensuring the largest irrigation area, but also forms a natural artesian irrigation system, which can irrigate more than 40,000 hectares of land. Zheng Guo became an ancient water conservancy engineering designer with the same name as Li Bing.
Sima Qian's "Book of Rivers and Canals" records: "Canal Cheng, filled with silt water, more than 40,000 acres (folded to 1.1 million mu) of land, harvested one acre (folded 100 kg now), so Guanzhong was fertile, no fierce year, Qin was rich and strong, and the princes were killed, because of the fate of Zheng Guoqu." Korea's original goal was not only not achieved, but also counterproductive, promoting the qin state to become richer, and strengthening the already solid economic foundation for the qin state to unify the world.
After the Qin Dynasty, successive generations of people continued to improve this water conservancy facility: successively through the Baigong Canal of the Han Dynasty, the Sanbai Canal of the Tang Dynasty, the Fengli Canal of the Song Dynasty, the Wang Yushi Canal of the Yuan Dynasty, the Guanghui Canal and Tongji Canal of the Ming Dynasty, and the Longdong Canal of the Qing Dynasty. Until the Republic of China, in 1929, a major drought occurred in Guanzhong, Shaanxi, and Mr. Li Yizhi, a famous water conservancy expert in modern China, presided over the dredging of the river, so that this trunk canal continued to benefit the people.
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