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The weight (wi) and relative weight (Wi) of each chemical parameter calculated based on the standard values reported by the World Health Organization [1], [2], [3].
| Parameter | WHO guideline (mg/L) | Weight (wi) | Relative weights (Wi) |
|---|---|---|---|
| [K+] | 12 | 2 | 0.056 |
| [Na+] | 200 | 4 | 0.111 |
| [Mg+] | 50 | 3 | 0.083 |
| [Ca2+] | 75 | 3 | 0.083 |
| [HCO3] | 120 | 1 | 0.028 |
| [Cl−] | 250 | 5 | 0.139 |
| [SO4] | 250 | 5 | 0.139 |
| [pH] | 8.5 | 3 | 0.083 |
| [TDS] | 500 | 5 | 0.139 |
| Σ | Σ |
