The main objectives of this project are to analyze water quality status of the Beigang river basin and the Xinhuwei river basin in Yunlin County in order to detect the distribution and fluctuation of river pollution sources. The goal is also intend to assess the pollution loading of the river basin, including point source and non-point source pollutions. Employing both the existing water quality models and the results of water quality samplings, the calibration and verification of water quality model have been conducted. In addition, it evaluates the excessive discharge of various pollutants in the river. The purpose is to develop the prevention control strategy of the major water quality monitoring stations and the elicited of the indicator pollutants. Meanwhile, it further assists to carry out the "River Pollution Restoration Assessment Plan". For Beigang river, Xinhuwei river tributary drainage and other large drainage basins, 52 river water quality sampling stations have been analyzed, and river water quality model calibration, verification and related approaches have been conducted. The calibration and verification results show that they are both excellent and reasonable predictions. Based on the past relevant plans and the results of the water quality sampling of this project, the water quality changes of Beigang river and Xinhuwei river have been illumined. The primary indicator pollutants are biochemical oxygen demand and ammonia nitrogen. In the Beigang River Basin, the main source of BOD is domestic sewage, followed by livestock wastewater, accounting for 50.1% and 37.7% respectively, and non-point source pollution at 9.8%. Ammonia nitrogen pollutants mainly come from domestic sewage and livestock sewage pollution, accounting for 44.1% and 39.4% respectively, while non-point sources are 16.5%. Suspended solid mainly comes from non-point source pollution, accounting for 57.5%, followed by domestic sewage 22.7% and livestock wastewater 17.6%. The Xinhuwei River Basin is mainly polluted by livestock wastewater. In the catchment area, BOD, ammonia nitrogen and SS, livestock wastewater account for approximately 66.1%, 66.1% and 42.6% of the total respectively. It is recommended that the indicator pollutants that are prioritized for control in the Beigang River Basin can be mainly from heavily polluted water quality monitoring stations, such as the Tuku Bridge and the Guanguang Bridge, to improve BOD and ammonia nitrogen. The target pollutants BOD and ammonia nitrogen that are prioritized for control in the Xinhuwei River Basin are recommended to be improved mainly from the increasingly polluted Feng Bridge and Haifeng Bridge water quality monitoring stations. Subsequent development of various water pollution restoration strategies and directions should fully strengthen pollution reduction work for indicator pollutants, including sewer construction, on-site water purification projects, animal husbandry fermented liquid and residue resource recovery, and strengthened audit control measures and other related strengthening measures and strategies. The past collection and consolidation of river pollution restoration plans and related work implementation results have been accomplished. Furthermore, the relevant enforcement measures and strategies have been proposed. Four administrative meetings have been completed. The responsible parties and experts have been invited to participate the aforementioned meetings. It meets the Public Private Participation of US EPA requirements. Currently, 100% check points of this project have been completed. Overall speaking, the requirements of this project have been successfully accomplished.

Pollution sources emission database, River assimilate capacity, River pollution restoration assessment plan