Lecture on Water Resource Delft meeiting 29 … Res Lec I.pdf11/18/2015 5 Delft meeiting 29 November...

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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

Delft meeiting 29 November 2007

Problem : Flooding

Flood in

Watershed


Problem : Flooding

Flood in

Urban area


Problem : Drought

Water

Shortage

Delft meeiting 29 November 2007 Delft meeiting 29 November 2007

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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


Misunderstandings

and

Scientific and Engineering Findings

In Rainwater Management

Rainwater is free.

Rainwater Quality Energy Requirement

Climate Change Adaptation Potential


Rainwater is free

Groundwater is not free


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


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-


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


God City (神市)


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)


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

Star City Rainwater management

Star city RWH system


2

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


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


New Paradigm : Decentralized Management


Source Control & Management by Area

1. Underground

Cisterns

2. Surface runoff

Control

3. Pavement

Runoff Control

4. Total Rainwater

Management in

Complexes


Decentralized System

Localized Heavy Rain

Flood in Rural Area

Flood in Urban Area

Overflowing Repeated Disaster


Present System


Localized Heavy Rain Decentralized System

Reduction of flow

Reduction of flow

Detention Infiltration & catchment facilities

Infiltration & catchment facilities

IRCSA,%202009/Star%20city.avi

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

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

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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


Operational strategy of rainwater tank in SMG


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


The secret of Korean rainwater management

• The worst natural condition (Climate and geological)

• Requirement for survival

• Philosophy and Tradition


Rainwater Management in Korean History


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)

F:/../Local Settings/Temporary Internet Files/Content.IE5/Local Settings/Temporary Internet Files/Content.IE5/ATPIREDS/Seoul IT rainwater management.mpg

IRCSA,%202009/Seoul%20IT%20RWM.mpg

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Land of beautiful scenery

Spring Summer

Autumn Winter

What’s the secret?


The rain gauge

The rain gauge (since 1441)


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


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.


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

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