With its network of criss-crossing channels and rivers, the city faced the constant threat that these would rupture and cause flooding. And so the court would directly order city inspectors to demolish illegal structures that blocked or threatened this network.
事實上，汴京除了保持排水溝清潔，因城內河道縱橫，常有決口之險，易造成水災泛濫，於是對侵佔溝渠、設置障礙物者，朝廷或直接干預，或令開封府監督進行拆除。