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🇨🇳 China · Hydraulic works
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.