Secchi Disc to Measure Turbidity (image) Smithsonian Tropical Research Institute Share Print E-Mail Caption One of the standardized measurements taken at all CARICOMP Caribbean monitoring sites is water turbidity, an indicator of water quality. Decreases in visibility were most likely where human populations increased the most. Credit Karen Koltes Usage Restrictions Credit: Karen Koltes Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.