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WQI was based on seven important physicochemical parameters (Table 9). WQI was calculated by using the recommended standards of irrigation using the following equation:
formula
2
where Qi is the quality rating of the ith parameter for a total of (n) water quality parameters, Vn represents values of the water quality parameter obtained from the laboratory analysis, Vi represents the ideal value of the parameter [Vi = 0, except for pH (Vi = 7) and DO (Vi = 14.6 mg/l)], and Vs represents values of the water quality parameter obtained from the recommended standard.
Table 9

Selected variables used in the WQI calculation and their recommended values (Rown et al. 1972)

VariablesMaximum recommended valuesWi
TDS (mgl/L) 2,000 0.00041 
EC (μS/cm) 2,250 0.00037 
SAR 26 0.03185 
Hardness 100 0.00828 
pH 6.5–8.5 (7.5) 0.11040 
Ki 0.82799 
Na% 40 0.02070 
 sum of Wi 1.00000 
VariablesMaximum recommended valuesWi
TDS (mgl/L) 2,000 0.00041 
EC (μS/cm) 2,250 0.00037 
SAR 26 0.03185 
Hardness 100 0.00828 
pH 6.5–8.5 (7.5) 0.11040 
Ki 0.82799 
Na% 40 0.02070 
 sum of Wi 1.00000 
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