The Qing Huidian • Three Ministries of Work • Dushui Qingli Division: "All workers have embankments, dams, fascines, tunnels, and culverts." Note: "Culverts are of the type of siltation culvert, drainage culvert, and irrigation culvert. The stone is used as the face stone on the wall, the bottom stone on the wall, the capping stone on the top, and the city wall behind the wall. The rest is different from the stone.", Culvert refers to the intersection of highway or railway and ditch