InnovativeInnovativeInnovativeInnovativeInnovativeInnovativeInnovativeInnovative Rainwater ManagementRainwater ManagementRainwater ManagementRainwater ManagementRainwater ManagementRainwater ManagementRainwater ManagementRainwater Management

in Urban Areasin Urban Areasin Urban Areasin Urban Areasin Urban Areasin Urban Areasin Urban Areasin Urban Areas

Challenges and Successful Examples from JapanChallenges and Successful Examples from JapanChallenges and Successful Examples from JapanChallenges and Successful Examples from JapanChallenges and Successful Examples from JapanChallenges and Successful Examples from JapanChallenges and Successful Examples from JapanChallenges and Successful Examples from Japan

Dr. RainwaterDr. RainwaterDr. RainwaterDr. Rainwater

FloodingFlooding

Backward Sewage Backward Sewage

Hit Town!!Hit Town!!

FromFrom FlowFlow

toto Stock Stock

on on

RainwaterRainwater

Water shortageWater shortage

Annual Rainfall : 2.5billion Annual Rainfall : 2.5billion Annual Rainfall : 2.5billion Annual Rainfall : 2.5billion Annual Rainfall : 2.5billion Annual Rainfall : 2.5billion Annual Rainfall : 2.5billion Annual Rainfall : 2.5billion ㎥㎥㎥㎥㎥㎥㎥㎥Annual City Water Supply : 2.0 Annual City Water Supply : 2.0 Annual City Water Supply : 2.0 Annual City Water Supply : 2.0 Annual City Water Supply : 2.0 Annual City Water Supply : 2.0 Annual City Water Supply : 2.0 Annual City Water Supply : 2.0

billion billion billion billion billion billion billion billion ㎥㎥㎥㎥㎥㎥㎥㎥

（（（（（（（（ TokyoTokyoTokyoTokyoTokyoTokyoTokyoTokyo ））））））））

From From OffOff--site site

toto OnOn--sitesite

on Water Resourceson Water Resources

The 6F of The 6F of

Kobe City Kobe City ＯｆｆｉｃＯｆｆｉｃＯｆｆｉｃＯｆｆｉｃＯｆｆｉｃＯｆｆｉｃＯｆｆｉｃＯｆｆｉｃｅｅｅｅｅｅｅｅ

was Crushedwas Crushed !!

FromFrom ““LifeLife--lineline””

toto ““LifeLife--PointsPoints””

Storage of Rainwater

�Flushing toilets�Supply for cooling towers�Watering plants

�Emergency water supplyfor drinking water, domestic water, fire fighting

Flood ControlFlood Control

•• Conservation of piped Conservation of piped

waterwater•• Securing a safe drinking Securing a safe drinking

waterwater

Sumo ArenaSumo Arena

Sumida City HallSumida City Hall

RojisonRojison::Community Based Rainwater Community Based Rainwater utilization systemutilization system

RojisonnRojisonn RU systemRU system

RojisonnRojisonn

Large

Scale

Medium

Scale

Small

Scale

Sampling date 99.1.19 95.4.19 99.1.19 96.8.4 95.4.19 99.1.19 99.1.19 99.1.19

N-NO３３３３ and N-NO２２２２ 3 1.6 1.2 1.4 2.1 3.2 3 1.5 10ｍｍｍｍｇｇｇｇ/ｌｌｌｌ ↓↓↓↓

Cl- 31.2 7.8 5.7 7.1 25.2 32 32.6 3.5 200ｍｍｍｍｇｇｇｇ/ｌｌｌｌ ↓↓↓↓

COD 2.8 4.2 1.9 2.2 3.9 3 2.8 2.5 10ｍｍｍｍｇｇｇｇ/ｌｌｌｌ ↓↓↓↓

Heterotrophic plate count 5 7 2 8 0 9 1 10 100/mｌｌｌｌ ↓↓↓↓

Coliform group －－－－ ＋＋＋＋ －－－－ －－－－ －－－－ －－－－ －－－－ －－－－ －－－－

pH 7.4 7.3 9.8 10.2 8.1 8.4 6.9 5.9 5.8～～～～8.6

Odor －－－－ ＋＋＋＋ －－－－ ＋＋＋＋ －－－－ －－－－ －－－－ ＋＋＋＋ －－－－

Color unit 3 7 5 4 1 2 5 3 5 ↓↓↓↓

Turbidity 1 1 1111 ↓↓↓↓ 1 ↓↓↓↓ 1 1 1 1111 ↓↓↓↓ 2 ↓↓↓↓

Analysis of the Quality of RainwaterAnalysis of the Quality of RainwaterAnalysis of the Quality of RainwaterAnalysis of the Quality of Rainwater

The water quality

standard of

piped waterPrivate facilitiesRojison

Public

Facility

RoofRoof tops looks like Mini Dams !tops looks like Mini Dams !

Policy systems for Policy systems for

Rainwater UtilizationRainwater Utilization

●●●●●●●● GuidelineGuidelineGuidelineGuidelineGuidelineGuidelineGuidelineGuideline, Regulations, Regulations, Regulations, Regulations, Regulations, Regulations, Regulations, Regulations

●●●●●●●● Incentives: Incentives: Incentives: Incentives: Incentives: Incentives: Incentives: Incentives: Subsidy systemsSubsidy systemsSubsidy systemsSubsidy systemsSubsidy systemsSubsidy systemsSubsidy systemsSubsidy systems

●●●●●●●● Development of Technology Development of Technology Development of Technology Development of Technology Development of Technology Development of Technology Development of Technology Development of Technology

●●●●●●●● Training for Architects Training for Architects Training for Architects Training for Architects Training for Architects Training for Architects Training for Architects Training for Architects

●●●●●●●● Awareness for CitizensAwareness for CitizensAwareness for CitizensAwareness for CitizensAwareness for CitizensAwareness for CitizensAwareness for CitizensAwareness for Citizens

Measurement of basement for Measurement of basement for

rainwater tank at the mansionrainwater tank at the mansion

Subsidy Systems Subsidy Systems for installation of rainwater tankfor installation of rainwater tank

Rainwater MuseumRainwater Museum

in Sumida City, Tokyoin Sumida City, Tokyo

Awareness for Importance Awareness for Importance of Rainwaterof Rainwater

Rainwater HouseRainwater House

Rain CenterRain Center

New Rain Museum for the base of New Rain Museum for the base of

awareness and activities of awareness and activities of

rainwater harvesting will be rainwater harvesting will be

completed at the development areas completed at the development areas

of super tower(600m height) , of super tower(600m height) ,

Sumida City, Tokyo by 2011.Sumida City, Tokyo by 2011.

Many Many ManyMany Mini Dams Mini Dams

Around the Cities in JapanAround the Cities in Japan

86 Local governments have subsidy 86 Local governments have subsidy

systems for installation of rainwater systems for installation of rainwater

tanks and infiltration systemstanks and infiltration systems

Rainwater Networks for Citizens, Rainwater Networks for Citizens,

Administrations, Businesses and Academic Administrations, Businesses and Academic

Associations will be established in 2008.Associations will be established in 2008.

ＲａｉｎｗａｔｅｒＲａｉｎｗａｔｅｒＲａｉｎｗａｔｅｒＲａｉｎｗａｔｅｒＲａｉｎｗａｔｅｒＲａｉｎｗａｔｅｒＲａｉｎｗａｔｅｒＲａｉｎｗａｔｅｒ loves loves

Peace !!Peace !!

President of America President of America

loves Tank ?loves Tank ?

No No ＭＭＭＭＭＭＭＭore Tanksore Tanks

for War,for War,

Tanks for Peace !Tanks for Peace !