Flood Mapping in KoreaFlood Mapping in Korea

2003. 10 2003. 10

Yang-Su KimYang-Su Kim

National Institute for Disaster PreventionNational Institute for Disaster Prevention

Ministry of Government Administration and Home AffairsMinistry of Government Administration and Home Affairs

Republic of KoreaRepublic of Korea

2BackgroundBackground

Records of flood frequency and magnitude have been updated almost every year

Limitation of structural countermeasures

Needs to strengthen the non-structural countermeasures

Global costs of extreme weather events(IPCC, 2001)

Years1950 1960 1970 1980 1990 1998

0

10

20

30

40

50

60

Annu

al d

amag

e(th

ousa

nd m

illio

n U

.S. d

olla

rs) Total economic loss

Average economic loss in ten years

3Flood MappingFlood Mapping

Past Flood Inundated Area Map

Flood-prone Area Map

Flood Hazard Map

Flood InundationArea Map(FIAP)

Flood InundationArea Map(FIAP)

Flood-ProneArea Map(FPAM)

Flood-ProneArea Map(FPAM)

Local dataLocal data

Flood Hazard Map

computer system

4Production of Flood Inundated Area MapProduction of Flood Inundated Area Map

Investigation of inundated area for every big flood

5Production of Flood Inundated Area MapProduction of Flood Inundated Area Map

Inundated Area Map of Anseong City in August 2000

6

Projects for 7 vulnerable reaches in Han river basin from 2000 to 2002 were performed

Production of Flood-prone Area MapProduction of Flood-prone Area Map(Flood Risk Map)(Flood Risk Map)

Nakdong River basin project was started in 2003

7Flood Hazard Map / Management SystemFlood Hazard Map / Management System

Computer System Configuration

Hardware Software

• PC(above RAM 64MB)• Storage Capacity needs 20MB• Color printer(Map print)

• GIS package : GEOMania

• Operation system : window

Background of system development

Hard to keep paper maps Hard to provide to practical user

Installed in 36 the local governments

8Flood Hazard Map / Management SystemFlood Hazard Map / Management System

System function

Section Contents

GIS Tool GEOMania

Base map(digital)

Topographic map(1:5,000 and 1:2,500)

function

• Input and retrieval of flood information - Climatical and hydrological data - Yearly inundated area• Search of information - search of continuously inundated area - Photograph of damage site - Inundation depth sign board - Public building• Disaster statistics• Flood hazard map design

9Flood Hazard Map / Management SystemFlood Hazard Map / Management System

10Flood Hazard Map / Management SystemFlood Hazard Map / Management System

11Flood Hazard Map / Management SystemFlood Hazard Map / Management System

12Flood Hazard Map / Management SystemFlood Hazard Map / Management System

13Flood Hazard Map / Management SystemFlood Hazard Map / Management System

Public building

Gauging station

Pumping station

Inundation depth sign board

Bank breaking point

Vulnerable area for flooding

14Work Division for Flood MappingWork Division for Flood Mapping

FIAM &

FPAM

NDMS DB

NDMS DB• Disaster investigation

- Flood inundation

- Land slide

bank breaking, etc

• Design of FIAM

• Design of FPAM

- Flood simulation

Local Gov

Client

Client

Design of FHM

Distribution andusage of FHM

Input

Total DataManagement

Total DataManagement Production of FHMProduction of FHM

Central Gov.(MOGAHA,

MOCT)

• Support of disaster investigation• Production of FPAM

• Total management of FIAM & FPAM• Improvement of NDMS function

• Institutional support

Research Center(NIDP,

KOWACO)

• Technical support• Assistance of disaster investigation

• Technical support• Education of gov. officer

• Technical support • Education of gov. officer

Local Gov.• Disaster investigation • Design and publication of FIAM• Input in NDMS(DB)

• Management of FIAM• production of FHM• Public information

Design ofFIAM & FPAM

Design ofFIAM & FPAM

Local Gov

15ConclusionConclusion

How to design Flood Hazard Map more efficiently?

How to distribute the Flood Hazard Map?

How to design the FPAM for regions where data are poor?