| SN | Metric Type (April) | Metrices | Calculation |
| 1 | Richness Measures | Taxa Richness | Total number of present taxa |
| Number of EPT Taxa | Number of Ephemeroptera, Plecoptera and Trichoptera | ||
| Number of Diptera | Present number of Diptera Taxa | ||
| Simpson’s index of diversity | 1 − D, D = ∑n(n − 1)/N(N − 1), where D = Simpson index, n = total number of ith taxa and N = total number of all taxa for a site | ||
| Shannon-Weiner diversity index | ∑pilnpi, where where pi = relative abundance of ith taxa and S = taxa richness | ||
| 2 | Composition Measures | % of EPT | Percentage of EPT individuals in a site |
| % of Diptera | Percentage of Diptera individuals in a site | ||
| 3 | Tolerance Measures | % of Tolerant species | Percentage of present taxa individuals with tolerance score > 6 |
| % of Facultative species | Percentage of present taxa individuals with tolerance score ≥ 4 to ≤6 | ||
| % of Intolerant species | Percentage of present taxa individuals with tolerance score < 4 |