Trophic State Index definition

Trophic State Index or “TSI” means the trophic state index for lakes, which is based on lake chlorophyll a, Total Nitrogen, and Total Phosphorus levels, and is calculated following the procedures outlined on pages 86 and 87 of the State’s 1996 305(b) report, which are incorporated by reference.

Trophic State Index means a numerical quantification of lake productivity. The Trophic State Index shall be determined by TSI = 9.81 x Ln(chlorophyll-a) + 30.6.

Trophic State Index means the results of the calculation for chlorophyll-a concentration using both Carlson, R.E. 1977, A Trophic State Index For Lakes, Limnology and Oceanography, 22:361-369 and the methods outlined in the Board guidance document "Guidance For Determining Lake Trophic State For Determination Of Nutrient Limited Waters Status".

Examples of Trophic State Index in a sentence

• Recent Trophic State Index (TSI) graph from Hillsborough Watershed Atlas.

• The TSI is a calculated index of lake condition based on nutrient and chlorophyll (a) concentrations (please see "Learn more about Trophic State Index").

• If it is demonstrated by the Trophic State Index or by other relevant data as provided in 785:46-15-1(c) that nutrient loading in a waterbody may be adversely impacting a beneficial use designated for that waterbody, then the Board may determine that the waterbody and its watershed is an NLW, and shall identify the waterbody and watershed as NLW in Appendix A of OAC 785:45.

• The trophic state is the ability of water to produce algae and other aquatic plants and the trophic state of a body of water is a function of its nutrient content and may be estimated using the Maine Trophic State Index (TSI), which includes measurements of chlorophyll, phosphorus or Secchi disc transparency.

• The summary data that are contained in these reports are developed from comparisons of a variety of water quality indices, described below, known as the Water Quality Index (WQI), the Trophic State Index (TSI), and the Stream Condition Index (SCI).

• A Class GPA waterbody, such Graham Lake, shall be considered to have a stable or declining trophic state unless it exhibits (1) a perceivable and sustained increase in its trophic state as characterized by its Trophic State Index or other appropriate indices, or(2) the onset of algal blooms.

• According to the Polk County Water Atlas, the historic average Trophic State Index (TSI) for Banana Lake from 1984-2005 is 83.7, indicating hypereutrophic conditions.

• Trophic State Index calculated from each lake following formulae in Carlson, 1977, & Davic, et al., 1996.

• Water quality monitoring reveals that Lake Ripley routinely exceeds its desired Trophic State Index (TSI).

• Governor Bond Lake was assessed as not meeting its designated uses because it exceeds Secchi depth (lack of water clarity), TSI (Trophic State Index), siltation rate (lake storage volume loss), or NVSSs (suspended sediments) designated use guidelines, or for a combination of these factors.

More Definitions of Trophic State Index

Trophic State Index means a classification system which uses algal biomass as the basis for classification which can be independently measured by chlorophyll a, Secchi depth, and total phosphorus concentration.