Abstract
We have evaluated three public works for environmental improvement of the urban river by “Eco-efficiency”. The “Eco-efficiency” is evaluated with four factors. They are willingness to pay, increase amount of visit, environmental loads and cost of the project. In order to uniform inhabitant's images about these environmental improvement project, we showed photomontage of the future urban river condition after implementation of the project. Using the photomontage, we researched WTP and increase of frequency of visit. And we estimated life cycle cost and lice cycle CO2 of the projects. As a result, the construction of the river water direct purification system had the best “Eco-efficiency”.
