Abstract
The purpose of this study is to make an accurate estimate of water demands in apartment houses. Therefore, we attempt to use the multivariate analyses of the statistical method utilized the data coming from the questionnaires of water usage and the measurements of water consumption in each household. The main contents are as follows. Based on the analyses of the factors of water usage, the water consumption in apartment houses is influenced mainly by the frequent use of the washing machine and bath, the consciousness of water savings, the family sizes and so on. Where, the consciousness of water savings is depended mainly on the performance of reuse of water in the bath. And the frequencies of the washing machine usage are related with family sizes. Then, we introduce the estimated equations of the water consumption per household according to the multiple regression analysis utilized the frequencies of water usage as the explanatory variables. And we show that it is possible to calculate the water consumption in each apparatus type. Based on the analyses mentioned above, we set the frequencies of water usage in each apparatus type which are clustered together by the characteristics of the household as the calculated conditions of water consumption. And then, using the calculated conditions and the multidimensional equations, we show the water consumption in each apparatus type according to the individual characteristics of the household.
