Table 5.

Identifying result of pollutant load change

Change of pollutant load	Increase from point source (UU, UN, UD)	Decrease from point source (DU, DN, DD)	Increase from nonpoint source (NU, DU, DN)	Decrease from nonpoint source (UN, UD, ND)
Number of sites (COD)	1	9	6	2
Number of sites (NH3-N)	1	11	2	3

“U” means significant upward trend, “D” means significant downward trend, “N” means no significant trend. “UD” means significant upward trend in dry season and downward trend in wet season, and other combination patterns were similar