Table 3.
Parameters used in calculation of water quality index.
| Parameters | WHO values | Weightage (wi) | Relative weightage (Wi) |
|---|---|---|---|
| TDS (mg/L) | 1000a | 4 | 0.0800 |
| pH | 7 | 4 | 0.0800 |
| EC (μS/cm) | 1500a | 4 | 0.0800 |
| TH (mg/L) | 200 | 2 | 0.0400 |
| Turbidity (NTU) | 1 | 1 | 0.0200 |
| HCO3−(mg/L) | 300 | 3 | 0.0600 |
| Cl−(mg/L) | 250 | 3 | 0.0600 |
| SO42−(mg/L) | 200 | 4 | 0.0800 |
| NO3−(mg/L) | 50 | 5 | 0.1000 |
| F−(mg/L) | 1 | 4 | 0.0800 |
| Na+(mg/L) | 200 | 2 | 0.0400 |
| K+(mg/L) | 100 | 1 | 0.0200 |
| Ca2+(mg/L) | 100 | 2 | 0.0400 |
| Mg2+(mg/L) | 50 | 2 | 0.0400 |
| Fetotal(mg/L) | 0.3 | 4 | 0.0800 |
| Astotal(mg/L) | 0.01 | 5 | 0.1000 |
| Σwi | 50 |
a
WHO has no strict values for these parameters.