A device placed at the end(s) of a culvert. Headwalls are used to: Retain the road formation soil around and above the culvert ends; Direct the entry/exit of water to/from the culvert; Prevent erosion at the entrance and exit to the culvert. Headwalls may be constructed from rock, gabion baskets, concrete, sandbags or logs.

A wall (of any material) at the end of a culvert or, drain to serve one or more of the following purposes: protect fill from scour or undermining; increase hydraulic efficiency, divert direction of flow, and serve as a retaining wall.

a retaining wall attached to the end of a culvert

A wall of stone, metal, concrete, or wood at the end of a culvert or drain to protect fill from scour or undermining, increase hydraulic efficiency of conduit, divert flow, retard disjointing of short sectional pipe, or serve as a retaining wall.

a vertical wall. A steeper than usual section of rock. A blank wall that blocks the way

a retaining wall at the end of a culvert or drainage conduit

The device placed at the end of a bridge that comprises a large portion of the abutment. Headwalls are used to retain the road formation soil around and above the abutments and prevent erosion at the abutment. Example.