tank trap
n.— «A former forester for the Uncompahgre National Forest, Cridler asserted that the forest service installed what is known as “tank traps,” water bar-type structures that are designed for logging roads meant to be decommissioned.» —“Corkscrew Gulch Now Open After Road Restructuring” by Christina Callicott in Red Mountain Pass The Watch (Telluride, Colorado) July 15, 2008. (source: Double-Tongued Dictionary)
Further reading
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