Table 7.

Load matrix of the principal components of each water quality index.

	Component	1	2	3	4
Item
pH		−0.634	0.011	0.318	0.617
EC		−0.755	0.457	−0.259	−0.090
DO		0.399	−0.805	0.094	0.182
BOD		−0.440	−0.462	0.265	−0.556
TP		−0.703	−0.075	−0.059	0.366
NO3-N		0.012	0.705	0.508	0.066
NO2-N		0.899	0.290	−0.049	0.087
NH3-N		0.761	0.336	0.200	−0.120
NTU		0.278	−0.211	0.710	0.195
SS		0.531	−0.093	−0.506	0.417