The Secchi Disk
Why are many disks black and white?
Considerations in Secchi Disk Design
Using a Secchi Disk (Procedural Considerations)
Examples of Methods Used by Monitoring Programs in the U.S.
Evaluating Eutrophication by Secchi Depth
Other Secchi Disk Resources
If you would like more information on using the Secchi Disk or on volunteer monitoring, the EPA maintains an online Volunteer Monitoring Manual. Be sure to check out this site if you are considering monitoring your lake.