Appendix II
2001 Lake Water Quality Report
Empirical Procedure for Calculating the Florida Trophic State Index.
(Table of Contents) (List of Appendices)
I.
PHOSPHORUS -
LIMITED LAKES (TN/TP >30)
TSI (AVG) = 1/3 [TSI (chl a) + TSI (SD) + TSI (TP)]
Where: TSI (chl a)
= 16.8 + 14.4 In chl a,
(mg/m3)
TSI (SD) = 60.0 ‑ 30.0 In SD,
(m)
TSI (TP) = 23.6 In TP ‑ 23.8,
(ug/l)
II.
NITROGEN - LIMITED LAKES (TN/TP<10)
TSI (AVG) = 1/3 [TSI (chl a) + TSI (SD) + TSI (TN)]
Where: TSI
(chl a) = 16.8 + 14.4 In chl a,
(mg/m3)
TSI (SD) = 60.0 ‑ 30.0 In SD,
(m)
TSI (TN) = 59.6 + 21.5 In TN,
(mg/l)
III.
NUTRIENT - BALANCED LAKES (10
<TN/TP <30)
TSI (AVG) = 1/3 [TSI (chl a) + TSI (SD)
Where: TSI
(chl a) = 16.8 + 14.4 In chl a,
(mg/m3)
TSI (TN) = 56 + 19.8 In TN,
(mg/l)
TSI (TP) = 18.6 In TP ‑ 18.4,
(ug/l)
TSI (SD) = 60.0 ‑ 30.0 In SD,
(m)
Note: TSI = Trophic State Index
Chl a = Chlorophyll a
SD = Secchi
Disk
TP = Total Phosphorus
TN = Total
Nitrogen
TSI (CARLSON) = 0.65 TSI (Florida) + 23.2