The results show that when PAC was used as the sole coagulant, supernatant with low turbidity can be achieved, however, only at very high dosage.

• 中文摘要台湾地区因具高山陡峻、河川短促之地理特性，河川流速湍急，河岸冲刷严重，且洪、枯水量差异大；