Maintenance depth
From BAWiki
Definition
Water depth at a certain reference water level (eg. GlW) whose conservation is desired. It corresponds to the minimum depth that should be present in the fairway ("depth of the navigation channel box" under the reference water level).
Synonyms
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Source
translated from "Glossar für das Forschungsprogramm KLIWAS, Mehling, Andrea et al., Bundesanstalt für Gewässerkunde, Koblenz 2011"