Table 1 Relative weight of some physicochemical parameters and WHO water quality standards
Parameters | WHO standards (2011) | Weight (wi) | Relative weight \(\text{W}_{\text{i}} = \frac{{{\text{w}}_{1} }}{{\sum\nolimits_{{{\text{i}} = 1}}^{\text{n}} {{\text{w}}_{1} } }}\) |
|---|---|---|---|
EC | 500 | 4 | 0.097560976 |
TDS | 500 | 5 | 0.121951220 |
TH | 100 | 3 | 0.073170732 |
Ca2+ | 75 | 3 | 0.073170732 |
Mg2+ | 50 | 3 | 0.073170732 |
K+ | 10 | 2 | 0.048780488 |
Cl− | 250 | 5 | 0.121951220 |
\({\text{HCO}}_{3}^{{ - }}\) | 500 | 1 | 0.024390244 |
\({\text{SO}}_{4}^{{2{ - }}}\) | 250 | 5 | 0.121951220 |
\({\text{NO}}_{3}^{{ - }}\) | 45 | 5 | 0.121951220 |
\({\text{PO}}_{4}^{3 - }\) | 0.5 | 1 | 0.024390244 |
PH | 6.5–8.5 | 4 | 0.097560976 |
| Â | Â | \(\sum {w_{i} } = 41\) | \(\sum {w_{i} } = 1.00\) |