The Trophic State Index (TSI) is used to evaluate a water body's health from the standpoint of nutrient concentrations.
You can use one of three different methods for computing TSI:
Carlson
Sigua, Williams, Coleman & Clark
Florida Department of Environmental Protection
As with other calculation routines, the first step is to identify the required PCodes, CCode, and destination table, and then a crosstab is computed showing all coincident input and computed TSI values. After that, you can add the computed TSI records to your Working table.