secchi-depth

Secchi depth

noun
the depth at which a Secchi disk is no longer visible from the surface of ocean water.
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American Heritage
Science Dictionary
Secchi depth   (sěk'ē)  Pronunciation Key 
A measure of the clarity of water, especially seawater. Secchi depth is measured using a circular plate, known as a Secchi disk, which is lowered into the water until it is no longer visible. High Secchi depths indicate clear water; whereas low Secchi depths indicate cloudy or turbid water. See also Secchi disk.
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