Detached house Numada, Tokyo
Use of filter collector FS
Object data
Tokyo, Japan | 2005
Sumida is a district in the centre of Tokyo. There are still large residential quarters with single-family houses here. The Numada house was built in 2005 by architect Shinji Munakata in a gap of less than 50 m².
Rainwater harvesting is worthwhile in Sumida for 2 reasons: The district pays the equivalent of 400 € per m³ of storage volume. This means that the builder received about 45 % of the total costs of his rainwater system as a subsidy. The second reason is that the annual precipitation is 1,500 l/m².
With a filter efficiency of more than 90 % with the WISY filter collector, 36 m³ of mains water can be replaced annually by rainwater, mainly for toilet flushing. The inlet to the cistern is designed in such a way that both a rainwater and a mains water pipe lead into it. When the cistern is empty, the inlet can be switched with a toggle lever. At the vehicle parking area on the ground floor, a cleaning water tap is connected to the rainwater network. A removable valve top has been fitted here for safety. All pipes and tapping points are marked "rainwater" to avoid confusion.
Project information
Water type
Rainwater
Use
WC and cleaning
Cistern volume [m³]
5,1
Roof area [m²]
34
Architect
Shinji Munakata
Cisterns
Rainwater storage made of in-situ concrete under the building
Annual precipitation
1.500
Rainwater yield
36
WISY products used
in the detached house Numada, Tokyo
Picture gallery
detached house in Japan
