International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(2027) Duration of tide, Duration of ebb tide Duration of flood tide
Duration of flood tide or a rising tide is the interval of time from low water to following high water; and duration of the ebb tide or falling tide is the interval of time from high water to following low water. Together, they cover a period of 12.42 hours for a semi-diurnal tide; the duration of the flood and ebb tides is approximately 6.21 hours each, but the duration may be modified by the presence of non- tidal flow. In a river, the duration of ebb tide is usually longer than that of a flood tide because of fresh water drainage. Also called `duration of rise` and `duration of fall of tide`.

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