Sec·chi depth (s k  )n. A measure of the cloudiness or turbidity of surface water. [After the Secchi disk.] |
| Secchi depth (sk) 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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