what is a seechi disc?
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a seechi disc is in 8-inch with alternating black and white quadrants.It is lowered into the water of a lake until it can no longer be seen by the observer. This depth of disappearance called the seechi depth is a measure of transparency of the water . I hope it helps you
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The Secchi disk, as created in 1865 by Angelo Secchi, is a plain white, circular disk 30 cm in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line, and lowered slowly down in the water.
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