Rainwater Harvesting System

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Hi everyone,

Rainwater re-use system is a very good option if you think about the environment and saving the cost for water.


Especially, this will be true when you live in Auckland, where lots of houses being built in higher density urban areas than before due to Auckland Unitary Plan; there is much heavier load on the existing water supply and drainage.

Japan Homes provides such rainwater harvesting system when we need to install a detention/retention tank for drainage for our project.

Rainwater Harvesting System

You can use collected rainwater (from the roof of your house) for toilets, washing clothes, watering the garden and washing your car (not for drinking).

The system consists of a underground tank with a pump, a rainwater/Mains water switch cabinet and piping work.


Rainwater is collected in the underground tank and the pump supplies water to water taps in the house and garden.

The switch cabinet automatically switches to mains pressure water if the retention tank is empty, or if mains power fails, to keep water supply all the time.

Advantage Of Rainwater Re-use

Less burden on the environment

  • Less load on the existing mains water system
  • Less load on the existing rainwater drainage network due to rainwater consumed for domestic purpose on site

Saving Cost

  • Saving water cost

Rainwater / Mains water Switch System

  • Keeping water supply all the time


This system is relatively easy to install.

If you are interested please let us know.

Thanks for reading!!




特にオークランドでは, Auckland Unitary Planの影響もあり、以前より高密度の都市部に多くの住宅が建てられており、既存の水道と雨水排水システムには重い負担がかかっており、雨水再利用は重要です。








  • 既存の水道システムに対する負荷を軽減する
  • 敷地内で雨水が使用されるので、既存の雨水排水システムにかかる負荷を軽減する


  • 水道料金節減


  • どのような場合でも給水を確保






Amazon OkuchiArchitectural Designer
Qualification: Degree of Architecture Studies and Graduate Diploma of Psychology (University Of Auckland) ; 2nd Grade Cad Technician (Japan)
Family: Extremely lovely wife, wonderfully kind mother in low, awesomely hardworking chickens, surprisingly lazy cat and unbelievably naughty dog.

I love architecture and design so much that I have been to so many buildings and places around the world such as Sydney Opera House in Sydney, CCTV building in Beijing, Empire State Building in New York, Royal Palace in Bangkok, Houryu-Ji in Nara, etc. However, the residential building attracts me the most. For nearly 10 years I have visited heaps of local and historical homes around New Zealand which I feel the builders’ great workmanship as well as occupants’ life.

From this experience my aim is to design and provide the comfortable and affordable houses with the spirit of Japanese workmanship that people enjoy and improve their quality of life.

In this blog I write my everyday experience of work to show what is a designer’s work and how it goes at Japan Homes.

Any comments or questions are very welcome.
Please let me know!