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 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.