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Carlson trophic state index？

The index to assess the degree of eutrophication in reservoirs is called the Carlson Trophic State Index (CTSI). The concentrations of three parameters, including Secchi disc depth (SD), chlorophyll-a (Chl-a) and total phosphorus (TP), are used to calculate and form an index value, which can help determine the level of eutrophication of reservoirs.

Reservoir eutrophication degree over the years

River Pollution Index？

The River Pollution Index (RPI) is a comprehensive index used to assess river water quality. The concentrations of four parameters, including dissolved oxygen (DO), biochemical oxygen demand (BOD5), suspended solids (SS) and ammonia nitrogen (NH3-N), are used to calculate the RPI, which determines the level of pollution in river water. The levels of pollution are divided into four categories: non/mildly-polluted, lightly-polluted, moderately-polluted, and severely-polluted.

River RPI over the years