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

Table 3

Correlation coefficients (r) of water quality concentrations with the precipitation at the upstream station (B).

Appropriate equation	Power	Logarithmic	Linear	Exponentially	Equation parameter
Y = 1.816X^−0.364	−0.164	−0.138	−0.141	−0.155	Na^+
Y = 0.547e^−0.004	−0.055	−0.197	−0.176	−0.062	Mg^2+
Y = 4.085X^−0.284	−0.319	−0.316	−0.283	−0.281	Ca^2+
Y = 1.993X^−0.389	−0.167	−0.158	−0.155	−0.141	Cl^−
Y = 6.715X^−0.421	−0.349	−0.326	−0.307	−0.322	HCO^3−
Y = 0.248X^0.225	0.187	0.126	0.105	0.164	SO₄^2−
Y = −77.31ln (x)+459.15	−0.243	−0.251	−0.232	−0.219	TDS
Y = −0.302ln (x)+8.260	0.257	0.259	0.229	0.237	pH
Y = 412.85X^−0.313	−0.243	−0.251	−0.232	−0.219	EC

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