Abstract
A questionnaire survey was carried out to analyze the residents' preferences for Teganuma basin. Their preferences were measured quantitatively by conjoint analysis, and the relationships between their preferences and personal attributes were analyzed. The estimated monetary values of river attributes can be applied to the effective planning of wastewater treatment in the basin. The results showed that frequent waterfront users gave high monetary values and recognized the waterfronts as amenity spaces. The marginal willingness to pay (MWTP) values were calculated as 4092, -1824, and 790 yen · y-1 per capita for decreasing 1mg · l-1 BOD, 10% water quantity, and 10% life-cycle energy consumption by waste water treatments, respectively. The value for improving river water quality was relatively high and water quantity was also recognized as having a high value. This suggests that a distributed wastewater treatment system ensuring both rivers water quality and quantity can lead to more desirable waterfronts for residents as compared with the conventional sewerage system.
