A Study on Application of Ecological Engineering Methods to a River Pollution Remediation – Case study of Liuchuan River

Abstract

The Liuchuan River is an urban river in Taichung City of Taiwan. It was been affected by the pollution of domestic sewage and commercial wastewater for many years, resulting in the degeneration of water quality in rivers. Because of the hard bank revetment along the coast, the urban blue ribbon are unable to interact with residents. In order to improve water quality pollution and waterway environment, the Taichung Water Resources Bureau prioritizes water quality improvement. Under the goal of ensuring flood control and drainage, it actively diversifies the waterway space to enhance the city’s local culture and life value. The purpose of this study is to analyze the improvement of water quality through the discussion of low-impact development engineering remediation projects. The water permeability of the riverbank before repair is almost 0%. After the improvement, the water permeability is increased by 50%, the green area is increased by 3,322 square meters, and the water quality RPI index is reduced from 7.25 “serious pollution” to 5. “moderately pollution”. This result shows that the Liuchuan River remediation project has successfully improved the water quality and river channel. Re-injecting green elements to create a hydrophilic environment for urban blue-green belts, improving the quality of residents’ living environment, and promoting the benefits of surrounding businesses and tourism.