Flood Forum Korea

8/3/2019 Flood Forum Korea

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KOREAS EXEMPLARY CASE OF FLOOD PREVENTION

Office of National River Restoration, Korea

MLTMRepublic of Korea

THE FOUR RIVERS RESTORATION PROJECT

AND ITS IMPLICATIONS TO THECHAO PHRAYA RIVER


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CONTENTS

BACKGROUND

THE FOUR RIVERS RESTORATION PROJECT

IMPLICATIONS TO THE CHAO PHRAYA RIVER


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1. BACKGROUND


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Han River

Nakdong

RiverGeum

River

Yeongsan

River

Major Rivers in South Korea


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1 Annual averaged precipitation of Korea :1,245mm

Similar to the Chao Phraya River (1,179mm)

2 2/3 of Annual rainfall during Flood Season (JUN - SEP)

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Climate : Korea (Temperate Monsoon) vs. Chao Phraya (Tropical Monsoon)

Repeated floods and droughts like Thailand

Water Shortage - Not much of Available Water

Just 27%(33.7 million) is available

Total amount of water available per capita in a year is approximately

1/8 less than the world average

HYDROLOGICAL CHARACTERISTICS IN KOREA


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Vicinity of the Nakdong RiverAnnual flood damage: US$ 2.2 billion

Restoration expenditure: US$ 3.5 billion

CLIMAGE CHANGE, HEAVY STORMS FLOOD DAMAGE

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- The photo & film competition of the natural disaster prevention

DROUGHT DAMAGES IN KOREA

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Temperature & Precipitation

Change of the pattern of precipitation

Annual Average 1971~2000 2061~2090 Increase

Temperature 12.5 16.1 3.6

Precipitation 1,230mm 1,398mm 14%

Annual temp. 3.6 & annual average precipitation 14%

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PROSPECT OF CLIMATE CHANGE IN KOREA


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Flood Damages (Typhoon : 2002 Rusa, 2003 Maemi, 2006 Ewinia)

* Total flood damage: 445.7 billion Baht(2000-2010)

Nation(Total) Han Nakdong Geum Yeongsan Others

Death 689 167 126 38 26 332

Damage Amount

(Billion Baht)415.5 80.7 108.4 24.7 19.7 181.9

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Drought Damages

* Severe drought cycle after 1990 : 7 year (940108)

Year Damages

1994~1995 86 Cities & Counties (173,269 ha)

2001~2002 86 Cities & Counties (304,815 people experienced water supply restriction)

2008~2009 77 Cities & Counties (1,227 Villages experienced water supply restriction)

FLOOD & DROUGHT DAMAGES (2000 - 2010)


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2. FOUR RIVERS RESTORATION PROJECT


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REVIVAL OF RIVERS: A NEW KOREA

Protecting

against

Floods

Promoting

Local

Economy

Securing

Water

Restoring

the River

Ecosystem

Improving

water quality

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PROJECT SCOPES & EFFECTS

FloodControl

Dredging: 0.46 billion ton,

Flood Control Retention: 6

Reinforcing old Levees: 620 km

lowering Flood

Water Level

(0.4 - 4m)

Water Security16 Weirs and two Dams

96 Improving Reservoirs

Secure 1.3 million

tons of water

Water Quality

Improvement

Sewage Facilities: 1,281

TP Treatment Facilities : 273

Swimmable water

76% 86%

EcologicalRestoration

Ecological Wetlands: 39

Preserving natural wildlife habitat

Fish-way Restoration: 14 sites

Improve Natural

Ecology & Promote

Eco-tourism

Waterfront

Development

Constructing bicycle roads: 1,657km

Tourist Attraction Sites : 36

Escalate peoples

quality of life

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Embanking

Agricultural reservoir

6.1

4.4

1.3

2.0

5.5

ImprovingWater Quality 3.4

Ecological StreamRestoration 2.7

Reinforcing levees &

Construction of Dams

Building weir

Dredging

Composition of Budget

(unit : billion USD)

Primary Projects Completed by 2011

Remaining Projects Will be Completed by 2012

Project Schedule

PROJECT BUDGET & SCHEDULE

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Water Level Decline by Dredging

1 FLOOD CONTROLDREDGING OF SEDIMENTED RIVERBED & AGRICULTURAL

LAND REMODELINGIncreasing Drainage capacity of the rivers

Lowering Flood Level by Dredging (0.46 billion)

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Sections for the agricultural land remodeling

AGRICULTURAL LAND REMODELING

Dredged soils are used for aggregate and improving agricultural landsDredged accumulations are treated by the soil pollution standard

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FLOOD CONTROL EFFECT IN 2011Record-breaking rainfall during rainy season (June 20~July 17, 2011)

* The annual mean precipitation : 1,245mm

- Rainfall over 640mm for 20days (2.6 times more than the average)

No damaged areas due to the low flood water level (2~4m )

by dredging

Rivers 1.Han 2.Nakdong 3.Geum 4.Yeongsan

MainstreamYeoju Sangju Yungi Naju

2.54m 3.78m 3.36m 2.13m

TributarySeom Hyung Miho Hyungrong

0.5m 1.3m 0.5m 0.6m

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2 WATER SECURITY

16 WEIRS: STORING 800 MILLION TON

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Sedimentation

Discharge

Water Level

Control

Discharging Sedimentations periodically

Controlling water level by flood forecast

Lift Type Rotary Type (Rising Sector) Turning Type

MOVABLE WEIRS

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Water Quality Improvement Facilities: 1,281 (3.9 trillion won)

Sewage Facilities: 1,044

Total Phosphorus Treatment Plant: 273

76% (2006) 86% (2012)

* Estimated by National Institute of Environmental Research

* Swimmable Water: Water Quality Grade II, BOD 3mg/L)

Non-point Pollution Source Reduction

3 WATER QUALITY & ECOLOGY IMPROVEMENT

CLEAN WATER (SWIMMABLE WATER)

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Ecological Stream: 929 km

Ecological Wetland: 39 sites

Total 3.87 million of the

wetlands will be expanded

(115.89 119.76 million)

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4 ECOLOGICAL RESTORATION

Propagation of Endangered Fishes

Restoration of fish migration and

natural wildlife habitat

Preserving Endangered Species


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5 WATERFRONT DEVELOPMENT

MULTI-PURPOSE USING OF WATERFRONT

Coexistence of the People and Natures

Making easy accessible waterfront sites

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Constructing bicycle roads (1,657km)

Promenades, Water Leisure sports area

ESTABLISHING LEISURE PLACE


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SITE PHOTOS

Geum River (2010. 3) Geum River (2011. 5)

Maegdo District (2011. 5)Marathon racing (2011. 5)22


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SITE PHOTOS (weirs)

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3. IMPLICATION TO THECHAO PHRAYA RIVER


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WHAT WE DID FOR IMPLEMENTAION

PUBLIC

PARTICIPITAIONORGANIZATION

LEGAL

COMPLIANCE

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PROJECT ORGANIZATION STRUCTURE

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EXECUTION OF MAJOR LEGAL PROCEDURES

Environmental AssessmentJune 2009: Preliminary Environmental Review were completed

June 2010: Environmental Impact Assessment were completed

A post-construction environmental impact survey is now underway

It is being carried out for the three years from commencement to completion ofconstruction.

Cultural Property Survey

220 personnel from 23 organizations that the Cultural Heritage Administration publicly

announced as excavation-specializing organizations participated in an earth-surface survey.

It was meticulously conducted over three months (February 10April 30, 2009)


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PUBLIC PARTICIPATION

Public Meeting

- 126 Times with 37,000(2009)

- 70 Times with 23,000 (2010)

Feedback Process with Local Government

- Local Governments submitted 836 Recommendations,

(worth 98.3 trillion KRW)

- River-related 213 cases were reflected in the Plan

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INTEGRATED WATER MANAGEMENT

Multi-purpose Weir(Small Scale Dam)

Integrated River Management System

Multi-purpose Dam& Flood Control

Retention

A comprehensive management throughintegrated approaches with weir, dam, flood

control retention, etc.

OPERATION, MAINTENANCE, MANAGEMENT


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Joint Operation

(Flood Control)

Retarding &

Retention

- Detention basin

- Retention areas- Storage ponds

Build Storage

- Dam

- Reservoirs

Quick Drainage- Diversion canal- Dredging- Barrage

Safe water block

- Distribution plan- Zoning & Pumping- Embankment

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Establish a project plan based on the priority and implementation of short

term plans as early as possible

Short term

plans

1) Dredging in bottlenecked region and

Remodeling of farmland

2) Develop an IWRM system and Joint operation

Long term

plans

3) Movable Weirs

4) Construction of multi-purpose dams,

5) Diversion canals and Detention ponds,

6) Barrages (river mouth and key control points)7) Division of drainage zones

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www.4rivers.go.kr

Thank you for your attention!

Flood Forum Korea

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