The construction drawings of subgrade water supply and drainage of a highway pavement, including the drainage design drawing of the central separation strip, the schematic diagram of the connection between the side ditch and the chute, the chute and the drainage ditch, I-I profile, the interface diagram of the cement mortar tape, the schematic diagram of the subgrade drainage system, the section diagram of the concealed side ditch, the layout plan of the inspection well, and the vertical section diagram of the crevice drainage ditch, are for your reference