Flood Mapping in Korea 2003 10 Yang-Su Kim

Flood Mapping in Korea 2003. 10 Yang-Su Kim National Institute for Disaster Prevention Ministry of Government Administration and Home Affairs Republic of Korea

Background 2 Global costs of extreme weather events(IPCC, 2001) Annual damage(thousand million U. S. dollars) 60 Total economic loss 50 Average economic loss in ten years 40 30 20 10 0 1950 1960 1970 1980 1998 Years Records of flood frequency and magnitude have been updated almost every year Limitation of structural countermeasures Needs to strengthen the non-structural countermeasures

Flood Mapping Past Flood Inundated Area Map Flood-prone Area Map Flood Hazard Map Flood Inundation Area Map(FIAP) Flood Hazard Map computer system Flood-Prone Area Map(FPAM) Local data 3

Production of Flood Inundated Area Map Investigation of inundated area for every big flood 4

Production of Flood Inundated Area Map of Anseong City in August 2000 5

6 Production of Flood-prone Area Map(Flood Risk Map) Projects for 7 vulnerable reaches in Han river basin from 2000 to 2002 were performed Nakdong River basin project was started in 2003

Flood Hazard Map / Management System Background of system development ü Hard to keep paper maps ü Hard to provide to practical user Installed in 36 the local governments Computer System Configuration Hardware • PC(above RAM 64 MB) • Storage Capacity needs 20 MB • Color printer(Map print) Software • GIS package : GEOMania • Operation system : window 7

Flood Hazard Map / Management 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 8

Flood Hazard Map / Management System 9

Flood Hazard Map / Management System 10

Flood Hazard Map / Management System 11

Flood Hazard Map / Management System 12

Flood Hazard Map / Management System Public building Gauging station Pumping station Inundation depth sign board Bank breaking point Vulnerable area for flooding 13

Work Division for Flood Mapping Total Data Management Design of FIAM & FPAM Local Gov • Disaster investigation - Flood inundation Production of FHM NDMS DB Design of FHM Client - Land slide bank breaking, etc Input • Design of FIAM • Design of FPAM - Flood simulation Central Gov. (MOGAHA, MOCT) Research Center (NIDP, KOWACO) Local Gov FIAM & FPAM Client 14 Distribution and usage of FHM • Support of disaster investigation • Production of FPAM • Total management of FIAM & FPAM • Improvement of NDMS function • Institutional support • Technical support • Assistance of disaster investigation • Technical support • Education of gov. officer • Disaster investigation • Design and publication of FIAM • Input in NDMS(DB) • Management of FIAM • production of FHM • Public information

Conclusion 15 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?