- About the secchi test
The concept of the secchi dip-in is simple. Individuals use a secchi disk, an 8-inch metal disk with alternating black and white quadrants, and lower it into any lake, river, stream or body of water, until it disappears. The depth that the disk disappears is carefully noted. This depth of disappearance, called the secchi depth measurement, measures the transparency, or clarity, of the upper water column.
— Source: Kathy Grant
Posted: Friday, July 27, 2012 12:00 am
Updated: 9:32 am, Fri Jul 27, 2012.
There's a lot to be learned about the life of a river, and a town, with one simple tool. A secchi (pronounced seck-y) disk can tell the right observer just how clean the water is.
Lodi Lake docent coordinator Kathy Grant and her student team of Storm Drain Detectives went out to three testing sites on Lodi Lake and the Mokelumne River to test water clarity on July 15. The results showed some improvement on one testing site, but two others worsened.
Friday, July 27, 2012 12:00 am.
Updated: 9:32 am.