Table 2 Assignment of weights in the ground water WQI
Parameter | Weight (wi) | Relative weight (Wi) | WHO standards |
|---|---|---|---|
pH | 3 | 0.05 | 8.5 |
Conductivity | 3 | 0.05 | 1400 |
Total dissolved solutes | 5 | 0.09 | 1000 |
Temperature | 1 | 0.02 | 25 |
True colour/appearance | 1 | 0.02 | 15 |
Turbidity | 1 | 0.02 | 5 |
Total Hardness | 3 | 0.05 | 500 |
Calcium ions | 3 | 0.05 | 75 |
Magnesium ions | 3 | 0.05 | 50 |
Chloride ions | 5 | 0.09 | 250 |
Nitrate-nitrogen | 5 | 0.09 | 10 |
Nitrite-nitrogen | 4 | 0.07 | 3 |
Total iron | 1 | 0.02 | 0.3 |
Ammonium ions | 5 | 0.09 | 1.5 |
Fluoride | 5 | 0.09 | 1.5 |
Aluminium | 5 | 0.09 | 0.2 |
Arsenic | 5 | 0.09 | 0.01 |
|  | ∑wi = 58 | ∑Wi = 1.00 |  |