The Environmental Protection Bureau Kaohsiung City Government has submitted the project "Kaohsiung City Houjin Creek Wastewater Total Amount Discharge Reduction and Prevention Control" in 2021, which aims to follow up the improvement of water quality and depicts the discharge of ammonia nitrogen after the total amount control policy be implemented in 2017. According to lack of water resources and people's livelihood sewage hasn't been fully taken over, the pollutant concentration is gradually decreasing from upstream to downstream, which is consistent with historical records. Heavy metal accumulation in tributary sediments caused by pollution from neighboring utilities, with copper, zinc and nickel metals exceeding the upper limit of the sediment quality index. In the past 5 years, percentage of NH3-N severe contamination in Houjin Creek's has significantly dropped from 100% to 67%. In order to strengthen the management of total amount control and improve water quality, the project developing long-term and short-term strategies which verified by using the river water quality model. Through policy implementation, it should be possible to improve water quality.

Houjin Creek, Total Amount Discharge Reduction, Prevention Control, NH3-N