Lowest drain
From BAWiki
Definition
Lowest drain (current value) of similar periods in a certain time span at a measuring point. The lowest drain acquires its meaning by specifying a time period and a time span.
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Source
translated from "Deutsches Gewässerkundliches Jahrbuch (DGJ), Allgemeiner Teil, Bundesanstalt für Gewässerkunde, Koblenz, 2006"