Abstract
The purpose of this paper is to make clear the characteristics of water balance and BOD-loading in areas, where the changing conditions of building' s composition and the combination of water reuse systems and rainwater treatment systems. The matrix is used to simplify the calculation, then basic data, such as water quantity and quality, are investigated. After this, case studies are conducted using a simulation program. The results are as follows. Although the rate between residential buildings and office buildings is approximately 1:3, water supply and demand are well balanced for water reuse, it is useless to reduce BOD-loading against sewage systems.
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