To identity the priority of pollution control measure, the project conducted a survey of 2941 pollution sources in the Yen-Shui river watershed. It was estimated that the total daily BOD discharge is 38518.3 Kg. We suggested an addition of four routine-monitoring stations should be established to gain a clearer picture of water quality and effectiveness of pollution control measures. The results suggested the flood plain between Tai-Ping Bridge and Feng-Hua Bridge is suitable for landscaping. The inspections of these factories were reinforced by the inspection agencies. Sixty-nine anonymous discharge pipes along the rivers were investigated for their owners. Among them, 26 discharge pipes were seal because no one claimed the identities. To mitigate the loadings of municipal wastewater, the fecal sewage in septic tanks should be pump out regularly to sludge treatment facility at least once a year. Governmental buildings and schools should be the primary target to promote this maintenance practice. The project suggested that water quality indicators and public perception surveys are suitable to evaluate the river pollution cleanup projects. BOD, DO, and heavy metal concentrations were proposed as the three chemical parameters to represent the water quality. The project took three helicopter trips for airy photographs of the environmental conditions of the Yen-Shui River watershed. The Yen-Shui River watershed GIS program was developed with the functions of (1) spatial analysis, (2) pollution tracing, and (3) information query. An office named “River Restoration Center” was established under a collaboration project between EPA and Chang Jung Christian University in 2002. So far, seven other universities, eight NGOs, two communities, three elementary school, and one radio station were signed on as the volunteer groups for water quality monitoring, river patrolling, environmental education, and/or program broadcasting.

pollutants mitigation,water quality index,GIS database,, public participation