2023 Volume 79 Issue 25 Article ID: 23-25017
Rural areas of Japan are facing severe declining population and need to consider the recomposing of small-scale waterworks. However there is no reasonable method for these small-scale waterworks to examine the effect of recomposing, especially for the case including community based water management system (CBWMS), whose data is not enough. This study focused on operation cost, which is fundamental information for considering recomposing, and aimed to develop a method for estimating and comparing operation costs for 2 scenarios, continuing current management as CBWMS and combining it into public water system. We developed a forecasting equation to estimate the operating costs of CBWMS based on data collected from local administrative or community. We applied this equation for 16 existing model cases of CBWMS and compared the results of 2 scenarios, and confirmed that this method is able to provide quantitative information about expected cost merit according to each situation of CBWMS.