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tidal difference
The difference in time or height of a high or low water at a subordinate station and at a reference station for which predictions are given in the tide tables; the difference applied to the prediction at the reference station gives the corresponding time or height for the subordinate station.
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From McGraw-Hill Dictionary of Environmental Science.  The Content is a copyrighted work of McGraw-Hill and McGraw-Hill reserves all rights in and to the Content.  The Work is © 2008 by The McGraw-Hill Companies, Inc.
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