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Several methods are used to measure the clarity of the water

Taking the sighting distance of a black disk placed underwater using a periscope-type viewer, using a Secchi disk, which takes vertical measurements through the water or with a device that measures the strength of a collimated beam of light.

There are two main measurements of water quality:-

Visual clarity: the depth through water that is visible to the human eye

Light penetration: the amount of light available underwater for algae and aquatic growth.

Turbidity is a measure of how cloudy the water is. Turbidity can be measured in many ways such as a turbidimeter, Secchi disk, or a turbidity tube.

Learn more about the clarity of water here:

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