Table 1 The standard, weights, and relative weights of each parameter in WQI calculation25,46,47.
Chemical parameters | WHO standard | Weight (wi) | Relative weight (Wi) |
|---|---|---|---|
pH (/) | 6.5–8.5 | 3 | 0.0833 |
TDS (mg/L) | 1000 | 5 | 0.1389 |
EC(μs/cm) | 1500 | 5 | 0.1389 |
Na+ (mg/L) | 200 | 2 | 0.0556 |
K+ (mg/L) | 12 | 1 | 0.0278 |
Ca2+ (mg/L) | 300 | 3 | 0.0833 |
Mg2+ (mg/L) | 100 | 3 | 0.0833 |
Cl− (mg/L) | 250 | 4 | 0.1111 |
SO42− (mg/L) | 250 | 4 | 0.1111 |
HCO3− (mg/L) | 500 | 1 | 0.0278 |
NO3− (mg/L) | 50 | 5 | 0.1389 |
∑wi = 36 | ∑Wi = 1 |
