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From a glossary of terms used in highway engineering: Bulkhead: A retaining wall-like structure commonly composed of driven piles supporting a wall or a barrier of wooden timbers or reinforced concrete members. Abutment: A substructure supporting the end of a single span or the extreme end of a multispan superstructure retaining or supporting an approach embankment. Also, a solid wall that counteracts the lateral thrust of an arch. Sounds like we're talking about bulkheads used as abutments. Now, to get some built! Wayne
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