What hydraulic infrastructure did the Qing establish to control floods in the Loess Plateau?

• A. Dams without spillways
• B. A sea walls
• C. A system of levees
• D. A network of dikes, spillways, locks, dams and secondary channels

Answer: (D)

The main idea here is that flood control in large river systems often relies on an integrated hydraulic engineering network, not just one feature. In the Loess Plateau, the Qing built a comprehensive system to manage the Yellow River’s devastating floods: dikes to hold back water, spillways to provide safe outlets and prevent overtopping, locks to regulate water levels in connected channels, dams to store and release water, and secondary channels to divert excess flow away from vulnerable areas. This combination lets engineers store floodwaters, control when and where water moves, and route it away from towns and farmland. That level of completeness is why the detailed network described—dikes, spillways, locks, dams, and secondary channels—best matches the real approach used. Other options miss essential parts or describe structures that aren’t applicable to inland flood control in that region.