Benefit-Cost Analysis of Water Quality Improvement and Quantity Increase in Kao-Ping River

• Main Authors: Kuei-Yu Lee, 李魁裕
• Other Authors: Daigee Shaw
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/35906040282912391876

碩士 === 國立臺北大學 === 資源管理研究所 === 89 === The purpose of this research is that using social benefit-cost analysis to evaluate the projects of water quality improvement and water quantity increase in Kao-Ping River. Water quality projects include wastewater from swine industries and construction of domestic sewer system. Water quantity projects include Meinung Dam, Machia Dam, reinforcing the banks of the Nanhua Reservoir and Tsengwen River Cross-Border Channeling. In water quality improvement aspect, cost items that can be evaluated include producer surplus lost of wastewater from swine industries and the sewer system cost and benefit items include benefit of water quality improvement of drinking water source and river used benefit. In water quantity increase aspect, there is only projects’ construction and operation cost can be evaluated so that we will use levelized cost to compare each project. The special character of this research is the water quality model used when we assess benefit of water quality improvement. We use a benefit-cost analysis model to explain water quality improvement that Downing proposed. The meaning of this model is described as below: Pollution generated in the upriver will affect water quality of downriver after pollutant’s transportation and diffusion. This situation can be expressed as emission transformation function (ETF) and can be simulated. We use QUAL2E water quality model to simulate. After simulating, we can get the degree that the amount of pollutant reduction from upriver affects water quality of downriver. Then, the benefit of water quality improvement can be evaluated. In water quality improvement aspect, wastewater from swine industries and construction of domestic sewer system are united projects. They cost 31.86 billion dollars and benefit 43.97 billion dollars. The net benefit is 12.11 billion dollars. The benefit cost ratio is 1.38. The benefit reduces to 29.45 billion dollars when we don’t consider river used benefit but the benefit of water quality improvement of drinking water source. The benefit cost ratio is 0.92. In water quantity increase aspect, projects’ levelized cost are that Meinung Dam costs 3.82 dollars per cubic meter, Machia Dam costs 3.22, reinforcing the banks of the Nanhua Reservoir costs 0.77 and Tsengwen River Cross-Border Channeling project costs 1.66. If reinforcing the banks of the Nanhua Reservoir and Tsengwen River Cross-Border Channeling project are regarded as united projects, they cost 1.19 dollars per cubic meter.