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

Table 4

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

Appropriate equation	Power	Logarithmic	Linear	Exponentially	Equation parameter
Y = −737ln (x)+4.514	−0.055	−0.152	−0.138	−0.045	Na^+
Y = −0.004X+1.155	−0.055	−0.045	−0.055	−0.032	Mg^2+
Y = −0.403ln (x)+4.030	−0.110	−0.145	−0.145	−0.105	Ca^2+
Y = −0.013ln (x)+4.552	−0.089	−0.141	−0.141	−0.095	Cl^−
Y = −0.013X+2.815	−0.118	−0.130	−0.134	−0.118	HCO^3−
Y = 0.852X^0.088	0.055	0.032	0.032	0.032	SO₄^2−
Y = −3.398X+484.51	−0.077	−0.138	−0.138	−0.084	TDS
Y = 8.018X^−0.033	0.230	0.230	0.167	0.164	pH
Y = −5.345X+768.6	−0.071	−0.138	−0.138	−0.077	EC

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