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



(2411) Retention water level, Top water level, Normal top water level, Full supply level, or Normal water level
The lowest crest level of the sill for a reservoir that has a fixed overflow sill. In case the outflows are wholly or partially controlled by movable gates, syphons or other means, the maximum level to which water can rise under normal condition excluding the provision for flood discharge in the retention water level.

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