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TeachMeFinance.com - explain semidiurnal semidiurnal The term 'semidiurnal' as it applies to the area of coastlines can be defined as ' having a period or cycle of approximately one-half of a tidal day (12.4 hours). the predominating type of tide throughout the world is semidiurnal, with two high waters and two low waters each tidal day. the tidal current is said to be semidiurnal when there are two flood and two ebb periods each day. '.
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