The Secchi Disk - What is it?
http://mlswa.org/secchi.htm

Michigan Lake and Stream Associations


This website, hosted by the Michigan Lake and Stream Associations, offers a comprehensive description of the Secchi disk. It includes a history of the Secchi disk, a discussion on the value of Secchi readings, and a description of Secchi disk data and results analysis.

This resource is referenced here:
Subject: Biology, Geoscience:Geology:Sedimentary Geology:Sediment Transport and Deposition, Biology:Ecology:Habitats:Water Column, Geoscience:Hydrology:Surface Water:Water Quality/Chemistry
Resource Type: Scientific Resources:Overview/Reference Work
Grade Level: General Public, College Lower (13-14), High School (9-12), Middle (6-8)
Topics: Biosphere:Ecology, Ecology:Habitats:Water Column, Earth surface:Sedimentary Geology:Sediment Transport and Deposition, Hydrosphere/Cryosphere:Surface Water:Water Quality/ChemistryKeywords: turbidity, TSS, water clarity