Table 6.

Summary of water quality indices in present study.

Indices	Formula
Residual sodium carbonate (RSC)	${\text{RSC}=(\text{CO}}_3^{2-}+{\mathrm{HCO}}_3^{-})+\left({\mathrm{Ca}}^{2+}+{\mathrm{Mg}}^{2+}\right)$
Permeability index (PI)	$\mathrm{PI}=\frac{\mathrm{Na}+\mathrm{K}+\sqrt{\mathrm{HCO}3}}{\mathrm{Ca}+\mathrm{Mg}+\mathrm{Na}+\mathrm{K}}\times 100$
Kelly's ratio (KR)	$\mathrm{KR}=\frac{\mathrm{Na}}{\mathrm{Ca}+\mathrm{Mg}}$
Magnesium hazard(MH)	$\mathrm{MH}=\frac{\mathrm{Mg}}{\mathrm{Ca}+\mathrm{Mg}}\times 100$
Sodium percentage (Na %)	$\mathrm{Na}\%=\frac{\mathrm{Na}+\mathrm{K}}{\mathrm{Ca}+\mathrm{Mg}+\mathrm{Na}+\mathrm{K}}\times 100$
Sodium adsorption ratio (SAR)	$\mathrm{SAR}=\frac{\mathrm{Na}}{\sqrt{(\mathrm{Ca}+\mathrm{Mg})/2}}\times 100$
Soluble sodium percentage (SSP)	$\mathrm{SSP}=\frac{\mathrm{Na}}{\mathit{Ca}+\mathit{Mg}+\mathit{Na}}\times 100$