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CULVERT *
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A drainage structure that extends across and beneath roadways, canals or embankments.
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DRAIN *
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An artificial channel for draining water or carrying it off.
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TRENCH *
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An excavation used as a means of concealment, protection or both.
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DITCH *
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A long and narrow hollow or trench dug in the ground, often used to carry water though it may be dry for much of the year.
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* Copyright of English Heritage (1999)