Structuring wholesome water circulation
- While climate change induces to increase not only inundation risk but also drought risk, urbanization causes to decrease water-front space.
- With carrying out installation of rain storage-infiltration facilities which have multiple effects, such as recovery of springs by infiltration and effective applications of stored rainwater, installation of the rainwater storage-infiltration system and utilization of rainwater are implemented.
- By utilization of sewage facilities (rainwater pipes, municipal sewerages) and reuse of effluent water, building rich-moistened towns is implemented with recovering/creating water-front space considering citizenfs participation in operation/maintenance stage from the planning stage.
- Grasping the demands of water resources in areas and available water volume and water quality for effluent reuse, steady effluent reuse system is implemented by constructing the system to combine waters adequately.
Drought risk which is worried for its increase caused by climate change
Annual changes of average annual rainfalls in Japan
Annual change characteristics of river flow affected by climate change
Decrease of waterside space by urbanization
With urbanization, landfills of urban rivers and waterways have implemented.
Development of sewage system, such as covering of waterway and constructing rainwater conduits underground is one of the causes of reduction of waterside space.
Decrease of waterside space by urbanization
Public opinion poll about water ( Agency of the cabinet of Japan, June 2008 )
About a reply to gDo you want to use rainwater, recycled water?h, gYesh shares nearly 90%.
About grequests to the government about their contributionsh, answers are like gprotection and improvement of water environmenth and gencouraging reuse of treatment wastewaterh share more than those of the previous survey in 2001. Thus more demands for water environment and water reuse are shown.
Public opinion poll about water ( Agency of the cabinet of Japan, June 2008 )
Promotion of setting rainwater storage infiltration facilities which are capable of rainwater utilities addition to rainwater storage and infiltration functions
Utility of rainwater and cultivate of groundwater by setting rainwater storage-infiltration facilities
Applying stored rainwater in a reservoir which was constructed as flood measure to water resource for artificial small stream
Various utilities of treated effluent
Utilities of reuse water for purposes in 2006
Positive application to various usage of treated wastewater
Recovering /creating of waterside space with effective use of sewage facilities
Recovering /creating of waterside space with effective use of sewage facilities