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

Table 1

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

Appropriate equation	Power	Logarithmic	Linear	Exponentially	Equation parameter
Y = 20.009X^0.044	0.361	0.124	0.351	0.351	Precipitation
Y = 0.966X^−0.539	−0.88	−0.804	−0.471	−0.632	Na^+
Y = 0.708X^−0.399	−0.803	−0.779	−0.428	−0.490	Mg^2+
Y = 2.029X^−0.184	−0.750	−0.735	−0.435	−0.48	Ca2‏^+
Y = 0.969X^−0.522	−0.815	−0.764	−0.447	−0.554	Cl^−
Y = 2.399X^−0.284	−0.852	−0.811	−0.494	−0.624	HCO^3−
Y = 0.125ln (x)+7.232	−0.233	−0.399	−0.138	−0.063	SO₄^2−
Y = 260.12X^−0.313	−0.872	−0.841	−0.481	−0.563	TDS
Y = −0.076ln (x)+0.6166	0.382	0.389	0.303	0.305	pH
Y = 412.85X^−0.313	−0.872	−0.841	−0.481	−0.562	EC

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