Results in accordance with a survey of experts in industry, academic circles, and govemment agencies related to the relative importance of planning and design considerations factors for using constructed wetlands to deal with domestic sewage in rural communities in Taiwan are presented in this paper.
Economic aspect, environment and landscape aspect, management and maintenance aspect were summarized as the three decision-making factors according to the practical experience and the advice of relevant personnel. Each decision-making aspect factor is composed of four assessment sub-factors. The four sub-factors of economic aspect are land size, land acquisition, unit construction cost, and the percentage oftotal cost spending for the constructed of wetland. The four sub-factors of environment and landscape aspect are the efhcacy of sewage treatment, the etlicacy of landscape and leisure, the eMcacy of flood control, and the efficacy of ecological education. The four sub-factors of management and maintenance aspect are the managing unit, resowce, manpower, and training. There are totally 12 assessment sub-factors. According to the results of expert survey and AHP analysis, it is shown that the point view related to the relative importance of decision-making aspects of three groups under survey is not consistent .Management and maintenance aspect, economic aspect, and environmental and landscape aspect are the most important decision-making factors for the industry and non-classified analysis, the academic circles, and the govemment agencies,respectively.
Assessment of four sub-factors under each decision-making aspect indicated the followings. Land acquisition ts the item considered prior to the other sub-factors by all suweyed groups and non-classified analysis in regard to the economic aspect. AII surveyed groups pay more attention to the efhcacy of sewage treatment in regard to environment and landscape aspect. Govemment agencies emphasize the managing unit and the others give more anention to the fimding source ofmanagement and maintenance in regard to the management and maintenance aspect.