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The Raford River (An Dughiortach, the 'Dur Fluvium' of Ptolemy's record) is another classic example of an embanked river equipped with flood gates to inundate extensive low-lying areas and enhance the Belgic defensive system of the Turoe/Knocknadala oppidum. Flooding was intended to be used only when threatened with invasion. This is but one of numerous examples.
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