A headwall unit of one-piece lightweight construction. The headwall unit (10) comprises a rim (11) surrounding the mouth of a central recessed portion (R). The recessed portion is defined by an inclined or curved back wall (12), opposed side walls (14) and a preferably flat bottom wall (13). A bracket (15) extending rearwardly from the rear face of the back facilitates handling of the unit and serves as a convenient attachment site for anchoring device (16). When the unit is installed in a ditch wall, bottom wall is substantially horizontal and the rim is substantially flush with the ditch wall.
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