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10th International Rainwater Catchment Systems Conference
"Rainwater International 2001"
Mannheim, Germany - September 2001

Section 5: Legal and Political Aspects of Rainwater Harvesting

Paper 5.3

Subsidies for Rainwater Use by Local Governments

Ichiro Kita, Kouichi Takeyama, Kunihiko Kitamura, Shinagawa Akiko
Faculty of Life and Environmental Science
Shimane University


In recent years, the recognition of the importance of rainwater use has been increasing in Japan. Rainwater use in a narrow sense is the direct use of collected and stored rainwater, for example, its use as domestic water on islands that don't have any other water sources and its use to flush toilets, water the garden, etc. in urban areas. Since a rainwater seepage facility can promote penetration of rainwater into underground, it is effective in conservation of groundwater. It stores rainwater temporarily during heavy rains and prevents rainwater from flowing out in a sewer or river in a short time. It contributes also to prevent floods in cities. Therefore the effects of using rainwater seepage facilities can also be considered rainwater use in a wider sense.

In January of 1997, after the large earthquake in Hansin-Awaji, the city water system was seriously damaged. Although inhabitants were supplied with drinking water by water trucks, they suffered from the lack of domestic water. Rainwater use is expected could be of great help under such circumstances. In addition, even in a case of emergency, when lifelines are damaged by natural disasters, we expect stored rainwater to be used as an alternative to city water.

The number of newly-installed rainwater use facilities has been increasing, mainly in comparatively large-scale public buildings. If their numbers grow, the effects they bring will also grow. Therefore they need to be installed in private offices and housing as well. Thus, subsidies for installing rainwater use facilities have been enacted by local governments to promote their further diffusion.

In this research, investigation was made on the existing situation of subsidy systems by local governments.

PDF of full document (4pp, 19kb)

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