Impact of Precipitation and Flow Rate Changes on the Water Quality of a Coastal River

Table 2

Correlation coefficients (r) of water quality concentrations with the flow rate at the midstream station (W).

Appropriate equation	Power	Logarithmic	Linear	Exponentially	Equation parameter
Y = 18.192X^0.04	0.322	0.105	0.045	0.084	Precipitation
Y = 6.130X^−0.565	−0.783	−0.768	−0.605	−0.657	Na^+
Y = 2.55X^−0.463	−0.832	−0.824	−0.657	−0.742	Mg^2+
Y = −0.752ln (x)+4.535	−0.805	−0.813	−0.667	−0.691	Ca2‏^+
Y = 6.424X^−0.548	−0.806	−0.775	−0.615	−0.715	Cl^−
Y = −0.632ln (x)+3.966	−0.769	−0.794	−0.642	−0.646	HCO^3−
Y = −0.539ln (x)+2.584	−0.677	−0.694	−0.541	−0.543	SO₄^2−
Y = 868.41X^−0.388	−0.83	−0.825	−0.652	−0.709	TDS
Y = 0.003X+7.216	0.122	0.126	0.130	0.126	pH
Y = 1375.5X^−0.387	−0.829	−0.824	−0.65	−0.708	EC

Correlation coefficients underlined are not statistically significant at the significance level of 5%.