promotion of rain cities for climate change adaptation in … 2010... · delft meeiting 29 november...

Promotion of Rain Cities for Climate Change Adaptation in a River Basin

Professor Mooyoung Han* & Dr. Chunghyun Park**Director*, Rainwater Research Center, Seoul National University

Chairman, IWA Rainwater Harvesting and Management SGMember **, The National Academy of Science, Korea

Dec 6, 2010

Conference of Global Catchment Initiatives, Bonn, Germany

Delft meeiting 29 November 2007


2010 IWA Project Innovation AwardClimate Change Adaptation

through the promotion of Rain Cities

East Asia Region (June 4, 2010), Shanghai5


Philosophy of Water Management

- From 1D to 4D -


1 Dim

線

1 dimension


Heavy Rain

flooding

Inundation

River Overflow Flooding

Heavy Rain

1 dimensional Water Management

http://smiletw.myscan.org/download/graphic/symbols/097.GIF


11 Dim2Dim

面

2 dimension


Heavy Rain

Runoff Reduction

Storage Storage and Infiltration

Infiltration

Heavy Rain

For others and for me


http://smiletw.myscan.org/download/graphic/symbols/097.GIF


1차원2차원

3Dim

3 dimension


Rainwater Infiltration

Groundwater Use

For the environment



1차원2차원

3차원4 Dim

4 dimension


“For next generation …”



2. Multipurpose Rainwater Management


Multi-playerstrategy!

Multi Purpose and Proactive Rainwater Management

Delft meeiting 29 November 2007차 례

Flooding

Drought

Eco-friendly

Fire preventing

Water resources

Water cycle

Public involvement

Energy saving Water supply

law

River law

Countermeasures

against natural disaster

lawMultipurpose rainwater management

Multi purpose

The present of RWH in Korea _ law


3. Example of Decentralized Rainwater Management


Cover Story of Water 21(12. 2008. IWA)

Star City Rainwater managementStar city RWH system


Star City Rainwater management system

Location Jayang-dong Gwangjin-gu Seoul

AreaTotal Area : 62,505.2M2

Building Area : 16,867.729M2

UsageApartment, Officetel,

Commercial & Cultural facilities

Construction

duration

October. 2003 ~ March. 2007

ForFlood

Control ForWaterSaving

ForEmergency


Self Sufficiency in Water

Green Growth

Low Carbon

Climate Change Adaptation

Current

Rain City

Parameters for River Basin Management


Rain city promotion ratio (%)

Self sufficiency ratio in Water (%)

Annual Runoff Reduction (%)

Energy Saving (kwh/year)

Groundwater Recharge (ton/year)

0 0 0 0 0

10 4.66 1.41 98,064 953,400

20 9.33 2.81% 196,128 1,906,800

30 13.99 4.22 294,192 2,860,200

40 18.66 5.63 392256 3,813,600

50 23.32 7.04 490,320 4,767,000

100 46.64 14.1 980,640 9,534,000

Effect of Water Management Parameterswith the promotion of Rain Cities at Woncheon River Basin


IWA Water 21, Dec, 2010

Page 47-49


From Drain CityTo Rain City

Brain CitizensBy Training

Conclusion: Rainwater Revolution

47 Cities in Korea announced Rain City, and more to come rapidly.


Water Independency Ratio

External Supply 89%(Multi-regional water supply)

120 million ton/year

Total water usage :1.09millionXLPCD310LX365days=123millionm3/year // Rainwater : 21.07km2X1335mm=161miilion m3/year

Graywater (3%)Local water supply (3%)

Groundwater (4%)

Rainwater160 million ton/year

• Storage and infiltration • Groundwater recharge andUnderground Dam

• Water Independency Ratio50%


People depending on same water

Korean Philosophy of Rain City

village= +

samewater

Watershed managementDevelopment should be such that the

water system is the same before and after the development

promotion of rain cities for climate change adaptation in … 2010... · delft meeiting 29 november...

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