Projection of domestic water use influenced by water supply appliances - Case study in Tokyo

Abstract

In this study, the amount of the domestic water use was quantified by estimating the diffusion of the water supply appliances. Tokyo was selected as a case study. In addition, the exchanging the toilet bowl of the flushing toilet to the water saving type was investigated from both respects of energy and cost for reducing of the domestic water use. From a result, the calculated amount of domestic water use corresponded to the annual amount of that in this decades, it was considered that the consumption of water by flushing toilet would be large even in the future. Although the payback time regarding the cost is taking much time, it was considered that the exchange of the toilet bowl to was one of the effective solutions for reducing the domestic water use.