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The original Dujiangyan irrigation system was destroyed by the 1933 Diexi earthquake. The current Dujiangyan irrigation system was rebuilt after the Diexi earthquake in 1933 by Zhang Yuan (张沅) and his sons, including Zhang Shiling (张世龄). [citation needed] In 2000, Dujiangyan became a UNESCO World Heritage Site. Today it has become a ...
By the time of the Han dynasty, much of the canal had silted up and only a small section was still flowing. Under the supervision of engineer Bai Gong, a new canal was cut in 95 BC for irrigation. For the next 2000 years, re-cutting and moving the canal's feeder mouth upstream of the Jing River became a pattern as silt built up and river bed ...
Since the Han dynasty, the region of the Yangtze River grew ever more important to China's economy. The establishment of irrigation systems (the most famous one is Dujiangyan, northwest of Chengdu, built during the Warring States period) made agriculture very stable and productive, eventually exceeding even the Yellow River region.
The Yuan Dynasty saw the establishment of a government body in the form of a "Si" (司) near the capital to oversee the canal system. Known as the Huai & Yangtze Rivers Grain Transport Office, (江淮都漕运司) this was an offshoot of the Three Departments and Six Ministries of the administrative third grade or " San Pin " (三品).
Conscripts also maintained canal systems used for agricultural transport and irrigation. [94] Some of the larger Han canal renovation projects included repairs to the Dujiangyan Irrigation System and Zhengguo Canal, built by the previous State of Qin and Qin dynasty (221–206 BC), respectively. [94]
The tuntian (literally "garrisoning (on) farms") system evolved during the victorious campaign of 61–60 BC by Zhao Chongguo against the Qiang people. [5]While the tuntian system was made famous by Cao Cao's administration (c. 196–220 CE), Cao Cao's writings show that the system had been instituted as early as the Western Han dynasty during the reign of Emperor Wu (r.
One of the earliest accounts was a description by the Han dynasty philosopher Wang Chong (A.D. 27–97) around A.D. 80. [9] Unlike those found in the West, chain pumps in China resembled the square-pallet type instead of the pear-shaped bucket [dubious – discuss]. Illustrations of such Chinese chain pumps show them drawing water up a slanted ...
The Chinese astronomer Geng Shouchang of the Han dynasty (202 BC – 220 AD) invented it separately in China in 52 BC, and the Han dynasty polymath Zhang Heng (78–139 AD) was the first to apply motive power using a set of complex gears rotated by a waterwheel which was powered by the constant pressure head of an inflow clepsydra clock, the ...
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