🇨🇳 China · Hydraulic works
Zhengguo Canal – Jingyang Irrigation Canal (Zheng Guo Qu)
Warring States to Han continuous · Qin with Han engineer Zheng Guo (鄭國)
246 BCE 'sabotage' canal that irrigated 27,000 ha and enabled Qin to unify China.
🇨🇳 China · Hydraulic works
Zhengguo South Distributary Canal (Zheng Guo South Branch, Jingyang South)
Warring States Qin 246 BCE to Han 120 BCE (Zhengguo south) · Qin state Wei–Jing plain with Korean Zheng Guo engineer
South distributary 18 km ×14×2.6 m hangtu levees 3 m with 6 dragon-tail weirs 42 m and fish-scale carp gates 1.2 m: Zheng 246 BCE spy-branch.
🇨🇳 China · Hydraulic works
Lingqu North Pound Extension Canal (Qin Lingqu Northern Stepped Pound)
Qin 214 BCE to Tang 825 CE (Lingqu North pound) · Qin imperial (Shi Huang–Shi Lu) Lingqu Yue conquest hydraulic
North pound extension 1.2 km ×8×1.5 m with 3 Qin granite pound-locks 8×4 m ×1.0 m lift — earliest locks globally 214 BCE.