sill depth

sill depth

[′sil ‚depth]
(oceanography)
The maximum depth at which there is horizontal communication between an ocean basin and the open ocean. Also known as threshold depth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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They showed that the characteristics of the hadal waters were almost the same as those of the deep water at between 5000 and 7000 m depth, suggesting that the trench is filled uniformly with water that is almost identical to that at the sill depth. This contrasts with the conventional idea that the hadal zone has been isolated for a long time and thus has unique water characteristics.
CTD profiles in October 1994 showed warm water down to sill depth (30-40 m) with cold (-1[degrees]C) water extending to the floor of the fiord.