17 sampling point and 11 flow measurement point at Niu Chou river Drain system, Xin Hua Bu drain system, Lin Luo Drain system, Long Ching river drain system was chosen by water quality improve project area. 123 sampling and 44 flow measurement was completed during 2018-juan to 2018-December. Each sample analysis was estimated by Quality Assurance and Quality control. According to River Pollution Index (RPI), middle to severe pollution level was classify at Niu Chou River Drain system, severe pollution level was classify at Xin Hua Bu drain system, middle pollution level was classify at Lin Luo Drain system, None and lightly pollution level was classify at Long Ching river drain system. Drain system water quality was evaluated by water quality index (WQI). The water quality was between bad(不良) and middle(中下) water quality at Niu Chou river Drain system and Lin Luo Drain system, between pool(惡劣) and bad(不良) water quality at Xin Hua Bu drain system, between middle(中下) and normal(中等) water quality at Long Ching river drain system.

Pingtung County, water quality survey, Drain system