The main purpose of this project was to analyze the environmental background data of the Beigang River Basin and Xinhuwei River Basin in Yunlin County to further improve the water pollution situation. It was also hoped that the background water quality data of the tributary drainage and other drainages will be investigated to find out the source of pollution in detail, and to develop relevant pollution control measures based on scientific data. Through the establishment of river water quality model and the results of water quality sampling, the water quality model calibration and verification work were carried out. At the same time, it furthered assist in the tracking and management of various " River Pollution Restoration Assessment Plan " to improve the assessment results and strengthen their implementation effectiveness. And through scientific inspection methods, the inspection work of the Water Pollution Control Act under the jurisdiction was achieved. In addition, it is also possible to improve the management and payment of water pollution fees through water pollution fee collection and verification, and to handle the promotion of relevant laws and regulations of the Water Pollution Control Act to strengthen the familiarity of the businesses in the jurisdiction with various laws and regulations to avoid being punished. For Beigang river, Xinhuwei river tributary drainage and other large drainage basins, 103 river water quality sampling stations have been analyzed, and river water quality model calibration, verification and related approaches have been conducted. 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 illuminated. The primary indicator pollutants are biochemical oxygen demand (BOD) and ammonia-nitrogen. In addition, 202 times of ammonia-nitrogen water quality sampling work was carried out for the county's pipeline wastewater treatment facilities, and the collection of river pollution restoration strategies and related work implementation results over the past years, and related enhancement measures and strategies were analyzed and put forward. In the Beigang River Basin, the main source of BOD is domestic sewage, followed by livestock wastewater, accounting for 60.0% and 31.0% respectively, and non-point source pollution is 8.0%. Ammonia-nitrogen pollutants are mainly polluted by domestic sewage and livestock wastewater, accounting for 44.1% and 38.4% respectively, and non-point sources account for 16.1%. SS mainly comes from non-point source pollution, accounting for 50.4% of the total pollution, followed by 33.8% of domestic sewage and 15.4% of livestock wastewater. It is recommended that the priority pollutants in the Beigang River Basin be controlled mainly from the improvement of BOD and ammonia-nitrogen at the water quality monitoring stations of the Tuku Bridge and the Guanguang Bridge, which are more polluted. In the Xinhuwei River Basin, it is suggested that the control and improvement of the indicator pollutants BOD and ammonia-nitrogen should be prioritized from the Feng Bridge, Haifeng Bridge and the newly added Wengang Bridge water quality monitoring station, which are increasingly polluted. It is recommended to continue to formulate various pollution control strategies and guidelines, and to strengthen pollution reduction work for target pollutants, including sewer construction, on-site water quality purification projects, recovery of biogas residues and biogas slurry resources, and strengthening inspection and control actions... and other related strengthening measures and strategies. For the county's river pollution restoration assessment plan, the water quality improvement measures at key monitoring stations in the three seasons have been submitted and the estimated cumulative pollution reduction amount has been calculated. Completed 4 annual restoration assessment plan work review meetings. In addition, 166 inspections have been carried out on the collection and management of water pollution fees, and 5 publicity and explanation sessions on laws and regulations related to the Water Pollution Control Act have been held. The work of this project has been completed 100%, in compliance with the requirements of the contract.

River water quality model, River pollution restoration assessment plan, Key monitoring stations