WATER CONSERVATION EFFECTS OF POPULARIZATION OF WATER EFFICIENT TOILETS FOR MITIGATE DAMAGE OF DROUGHTS

Abstract

 When the popularization of water efficient appliances is promoted in order to mitigate damage of droughts, the reduction of damage should be evaluated by comparison of that between with and without the promotion. In this study the effects of the promotion of replacement with water efficient toilets on water conservation were estimated. When the replacement with water efficient toilets is promoted, how earlier time to replace the toilets comes and how more efficient toilets citizens choose are postulated. Without the promotion, water use for toilets in Takamatsu city in Japan is estimated to be decreased by 26.1L/cap/day in 20 years by water efficient toilets popularized gradually. If time to replace becomes 50%, the amount of water use might be decreased by 4.5 L/cap/day in 20 years to compared with that without the promotion. If citizen choose most efficient toilets, the amount of water use might be decreased by 0.9 L/cap/day in 20 years to compared with that without the promotion, which will have little effect on water saving.