![]() The formula used to calculate WQI for display on the Water Atlas is modified slightly from DEP’s formula, in that it does not incorporate biological diversity data (i.e., macroinvertebrate indices). For more information, see the Calculations section, below. Ranges of WQI values have been established to provide a general ranking of the waterbody (Figure 1.) The index is accompanied by a ‘confidence value’ that expresses the degree of completeness of the index (Figure 2). The quarterly WQI for a waterbody is determined by averaging the index values for selected water quality parameters for the interval. The Water Atlas presents WQIs for three-month intervals (Jan–Mar, Apr–Jun, Jul–Sep, Oct–Dec). WQI is used for streams, black waters (natural tea- and coffee-colored waters), and springs, while TSI is used for lakes and estuaries. To determine attainment of water quality standards under the Impaired Waters Rule of the Clean Water Act. Indicators of water quality, they are non-regulatory measurements they may be used by the Floridaĭepartment of Environmental Protection to identify water bodies that may need further study, but not Were developed for the statewide assessment of surface waters. ![]() The Water Quality Index (WQI) 1 is similar to the Trophic State Index (TSI) in that both ![]()
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