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11/18/2015
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Lecture on Water Resource
Drain City to Rain City
- A Rainwater Harvesting Perspectives
(Korean Example)
Manish Kumar Ph.D [Env. Eng (Univ. of Tokyo)]
Assistant Professor, Tezpur University, Assam, India
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Problem : Flooding
Flood in
Watershed
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Problem : Flooding
Flood in
Urban area
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Problem : Drought
Water
Shortage
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Challenges in urban water management
Di saster pr evention S ew er
W ater supply
Ar chitecture
U r ban water management
Amenity
Urbanization
Impervious area Rainfall Pattern
Climate change
A rtificial Challenges
Na tural Challenges
Social Challenges
Oil Shock
Infrastructure
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Misunderstandings
and
Scientific and Engineering Findings
In Rainwater Management
Rainwater is free.
Rainwater Quality Energy Requirement
Climate Change Adaptation Potential
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Rainwater is free
Groundwater is not free
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1. Rainwater is the origin of all water
Rainwater is the purest water in the world
Precipitation
5 ppm
30 ppm
60 ppm
400 ppm well
35000 ppm
sewer
+ 320ppm
WTP W.WTP
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0.00122
0.2405
0.00
0.05
0.10
0.15
0.20
0.25
tap water rainwater
energy consum
ption
unit: kWh / m3 Long mileage vs. short mileage!
0.2018
Energy consumption in transmission
Using decentralized water supply system save a lot of
Energy
Long term strategy for Climate Change
-Energy saving-
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Low
Carb
on
Green Growth
Effect to Environment
Ene
rgy
small large
Reuse
현장공급 (약 1.2KWh)
Desalination 현장공급 (약 9.3KWh)
Groundwater
Rain 현장공급(수처리
없음) (약 0.0012KWh)
Rainwater Spraying
↓
Can Reduce Cooling En ergy
En ergy for water supply alternatives
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M H
Storage+Pump Rainfall Discharge
Full! Full!
Ta nk+Pump VS Outflow
Climate Change Adaptation
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God City (神市)
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Govern the nation with three masters:
R a in (雨師), C loud (雲師) and Wind (風伯)
Tangun Wanggum
( 檀君 王儉 ) The founder
Importance of Rainwater !
Ruling Philosophy
“To make every party beneficial” (弘益人間)
Win – Win strategy
Establishment of Korea
The first nation – Ghochosun founded in B.C. 2333
at God City (神市)
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Cover Story of Water 21 (12. 2008. IWA)
Star City Rainwater management
Star city RWH system
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Star City
Star city RWH system Delft meeiting 29 November 2007
S tar City Rainwater management system
Location Jayang-dong
Gwangjin-gu Seoul
Area
Total Area : 62,505.2M2
Building Area :
16,867.729M2
Usage
Apartment, Officetel,
Commercial & Cultural
facilities
Constructi
on
duration
October. 2003 ~
March. 2007
For Flood
Control For
W ater Saving
For Emergency
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Tank capacity 3,000ton (1,000ton×3 tanks)
Catchment
Area (㎡)
Terrace 45,000
Roof 6,200
Rainwater Usage Gardening, Brook, Public toilet
•Collection of rainwater up to the first
rainfall of 100 mm
•Reuse of the infiltrated rainwater after
the gardening
F l ood p r evention
W ater s aving
E mergency
R a inwater R a inwater T ap water
P u mp P u mp
S wimming Pool
P ublic T o i let
R a i nwater from r oof
R a i nwater from terrace
Star City Rainwater management system
Star city RWH system Delft meeiting 29 November 2007
S tar City Rainwater management system
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They are now rushing for proactive rainwater management !!
STORE AND SOCK RAINWATER
4 a lls for all : Seoul City
Proactive project of rainwater management in Seoul "4 alls for all"
Objective: Recovery of water circulation In the city
Vision: Human∙Nature∙Urban (all) live together
All rainwater
using All
methods by All
people
From All place
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New Paradigm : Decentralized Management
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Source Control & Management by Area
1. Underground
Cisterns
2. Surface runoff
Control
3. Pavement
Runoff Control
4. Total Rainwater
Management in
Complexes
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Decentralized System
Localized Heavy Rain
Flood in Rural Area
Flood in Urban Area
Overflowing Repeated Disaster
Localized Heavy Rain
Present System
Localized Heavy Rain
Localized Heavy Rain Decentralized System
Reduction of flow
Reduction of flow
Detention Infiltration & catchment facilities
Infiltration & catchment facilities
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Operational strategy of rainwater tank in SMG
Remote Rainwater Tank Monitoring system
For Wat er Sav ing
For Flood
Con trol
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Operational strategy of rainwater tank in SMG
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Suwon city(水原)
S uwon
Name Suwon(水原 )
Area 121.14 km2
Population 1.1 million
Ave.
Temperature 13.0 oC
Ave.
Precipitation 1,335mm
Rainwater
Origin of water
水原
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The secret of Korean rainwater management
• The worst natural condition (Climate and geological)
• Requirement for survival
• Philosophy and Tradition
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Rainwater Management in Korean History
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Govern the nation with three masters:
R a in (雨師), C loud (雲師) and Wind (風伯)
Tangun Wanggum
( 檀君 王儉 ) The founder
Importance of Rainwater !
Ruling Philosophy
“To make every party beneficial” (弘益人間)
Win – Win strategy
Establishment of Korea
The first nation – Ghochosun founded in B.C. 2333
at God City (神市)
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Land of beautiful scenery
Spring Summer
Autumn Winter
What’s the secret?
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The rain gauge
The rain gauge (since 1441)
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People depending on same water
Oriental Concept of Eco-v illage
village
= 水 + 同 same water
洞
Watershed management
Development should be such that the water system is the same before and after the development
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Conclusion and Vision
Rainwater is Clean. Rainwater is Free.
The Worst Natural Condition in Korea have cultivated the best Climate Change Adaptation Strategy in the form of philosophy and tradition, which resulted in rapid
promotion of RainCities in Korea.
Several Successful Case Studies such as Star City, Seoul City and Suwon City triggered to promote many Rain Cities in Korea
Multipurpose and Proactive Decentralized Rainwater Management is a good strategy of Climate Change Adaptation by energy saving and flooding mitigation.
We need the promotion of Worldwide Rain Cities, starting from our city, with a win-win philosophy at the base.
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V ision of Rainwater Management
• Rainwater Utilization, Love the Earth
Earth
Heaven
People
Harmony
• Conservation of
village
洞 弘益人間 “To make every party beneficial”
THANK YOU WISH YOU ALL A HAPPY
LEARNING TIME