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mean high water spring
The mean high water spring is the highest level that spring tides reach on the average over a period of time (often 19 years). The height of mean high water springs is the average throughout the year (when the average maximum declination of the moon is 23.5°) of two successive high waters during those periods of 24 hours when the range of the tide is at its greatest.〔http://www.ntslf.org/tgi/definitions〕 This level is generally close to being the "high water mark" where debris accumulates on the shore annually.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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