Answer :
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:
https://brainly.com/question/20839188
#SPJ4