How is the tropic status index(TSI) calculated in the water quality module of EFDC? What parameters are they taking into account? Are they taking into account nitrogen?

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1

How is the tropic status index(TSI) calculated in the water quality module of EFDC? What parameters are they taking into account? Are they taking into account nitrogen?
Thank you!

2

Thank you for your question. TSI is a derived parameter calculation carried out in EE, not in EFDC. Nitrogen and phosphorus are not used. The equation is that of Carlson’s Trophic State Index where

TSI = 9.81 In (Chlorophyll-a in ug/L) + 30.6