Lots of good information here about water clarity. Five actually six main things commonly contribute to water visibility or clarity. 1. Suspended sediment, mud, dirt; 2. suspended organic detritus; 3. bacteria; 4. planktonic algae; 3. zooplankton; and 6. often water color or stain.
When one digs deep into the topic there have been a few comparisons made between secchi disk readings and NTU's plus some data about the two types or methods of measurements that I have gathered from information from Municipal water reservoirs. Generally the two readings are 'pretty' similar when plotted on a X-Y axis line. There are exceptions. I would post an example of one of the plotted data graphs but posting here is too inconvenient for my techy skills. If someone is willing I can send them one example graph for posting on this thread. Send me a PM.
Last edited by Bill Cody; 05/28/25 11:08 AM.
