Definitions for "Trophic state index"
any numerical index for estimating trophic state of a lake.
The trophic state index was developed in 1977 to provide a convenient measure of water quality. The scale is 1 to 100 and uses the three parameters of total phosphorus, chlorophyll and Secchi disk depth to categorize lake water quality.
A water quality index developed by R. E. Carlson in 1977 that uses three parameters (total phosphorus, chlorophyll , and transparency) to characterize nutrient levels of waterbodies on a scale from 1 to 100. The index is widely used because data collection for it is easy and economical, there is a relatively large existing database, and it takes into account both algae growth and suspended solids.