IWA Publishing

Relative weights (W_i) of water quality parameters were calculated using the below equations and tabulated in Table 1.

(4)

(5)

where V_s is ith parameter's standard value and (SLS 614:2013 standards) and k is a constant.

Table 1

Calculated relative weights (W_i) of selected parameters

S. No	Parameter	Standard value (SLS 614:2013) – V_s	Ideal value – V_i	Relative weight – W_i
1	Turbidity	2	0	0.244
2	Color	15	0	0.032
3	pH at 25 ± 2 °C	6.5–8.5	7	0.057
4	Chloride	250	0	0.002
5	Total hardness	250	0	0.002
6	Total alkalinity	200	0	0.002
7	Total dissolved solids	500	0	0.001
8	Nitrate	50	0	0.009
9	Nitrite	3.0	0	0.162
10	Fluoride	1.0	0	0.487

S. No	Parameter	Standard value (SLS 614:2013) – V_s	Ideal value – V_i	Relative weight – W_i
1	Turbidity	2	0	0.244
2	Color	15	0	0.032
3	pH at 25 ± 2 °C	6.5–8.5	7	0.057
4	Chloride	250	0	0.002
5	Total hardness	250	0	0.002
6	Total alkalinity	200	0	0.002
7	Total dissolved solids	500	0	0.001
8	Nitrate	50	0	0.009
9	Nitrite	3.0	0	0.162
10	Fluoride	1.0	0	0.487