2009/2/23

East & Southeast Asia Regional Seminar on Flood Hazard Mapping, 17-19 February 2009, Manila, Philippines

Introduction toFHM related situation in Lao PDR
Compiled by Oudomsack Philavong

Main floodplains• The Vientiane Plain (Vientiane Municipality andVientiane province),• Khammouane Province (Thakhek Town and
Xebangfai Mouth, Hinboun Mouth),• Savannakhet Province,• Saravan Province,• Champasak Province (Pakse Town), and• Attapeu province• Louangnamtha Province (Flashflood)1

2009/2/23• Provinces
affected byFlash Floodin 20072

2009/2/23

Flood statistics since 2002
Description

Flash flood damages
in 2007

Flash flood damages
in 2006

Flood damages
in 2005

Flood damages
in 2002

Provinces affected

4516

13

Districts affected

27208462

Villages affected

614

404

2,510

1,142

Families affected

25.292

13,54985,53050,342People affected

118. 074

89,849480,913249,782

2

5

5

3

74,739.8

6,913

55,95533,702

N/A

3.1

18.3

N/A

People killed

Hectares of rice and crop damaged

Total estimated cost damages in million US$

Flood in Xebanghieng in 200732009/2/23

Flood in Xedone in 2007

Institutional arrangement for flood
mitigation
1

Minister of Labor and Social WelfareChairman

2

Minister of Agriculture and Forestry

Vice Chairman

3

Chief of Cabinet , Ministry of Foreign Affaires

Vice Chairman

4

Chief of Cabinet, Ministry of Defense

Member5

Chief of Cabinet, Ministry of Security

Member6

Chief of Cabinet, Ministry of Education

Member7

Director General of Budget Department, Ministry of FinanceMember8

Director General of Transport Department, Ministry of Public Works and Transport

Member9

Director of Industry Department, Ministry of Industry and Commerce

Member

10

Director of Hygiene Department, Ministry of Public Health

Member

11

Director of Mass Media Department, Ministry of Information and Culture

Member

12

Director of Social Welfare Department, Ministry of Labors and Social Welfare

Member13

Chairman of Lao Red Cross Society

Member4

2009/2/23

Flood Risk Maps implementation• Xebangfai Basin (done)• Namtha Flashflood (under preparation)• Xedone Basin (in progress)• Xekong Basin (in progress)

Actors in Flood Mapping• Water and Environment Research Institute• Department of Water Resources• LNMC• Department of Irrigation5

2009/2/23

Xedone Flood Mapping
using iSIS Model

Xedone river:
Data preparation
39 cross-sections from field surveyed• Cross-section

Mekong river:River cross-sections from MRC iSIS Model62009/2/23• Topographic Data
Digital Elevation Model(DEM) with 50m of cell size
provided by MRCs

DEM (m)< 100
100 - 120
120 - 140
140 - 160
160 - 180
180 - 200
200 - 400
400 - 600
600 - 800
>800

• Reservoir and Spill Data
Reservoirs/Flood cell derived fromgenerating by GIS tool based onwater level and DEM and Floodarea done by Department ofIrrigation
Reservoirs

72009/2/23• Hydrological Data
Hydrological data available:•Flow :SWAT model
Khong ChaimPakse
Khong Se DoneBan Done Se
Ban Nanay•Water level:
Ban Done SePakse• Schematization
Upper boundary:Sedone at Ban Vapi
Mekong at Khong Chaim Station
Lower boundary
Mekong at Pakse Station

River Cross-section:
Mekong : 13
Sedone: 39
Reservoir: 17
Spill: 1058

2009/2/23• Calibration (at Souvannakhiri)
Calibrated Point

Calibrated Result
120
118
116
114
Obs
112

Sim

110

1-Dec-00

1-Oct-00

1-Nov-00

1-Sep-00

1-Jul-00

1-Aug-00

1-Jun-00

1-Apr-00

1-May-00

1-Mar-00

1-Jan-00

1-Feb-00

108• Results

9

2009/2/23

Constraints• No aerial photographs available

Thank you10