2009/2/23

Progress ReportOn
Flood Hazard Mapping in Thailand

By : Somchit Amnatsan
Chief of Water Management Branch
Regional Irrigation Office 2
Royal Irrigation Department, Thailand
somnatsan@yahoo.com

Personal Data)ame: Mr. Somchit Amnatsan
Organization: Regional Irrigation Office 2,
Royal Irrigation Department, Thailand

Present Position: Chief of water management branch

E-mail: somnatsan@yahoo.com, somnatsan@hotmail.com

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Flood situation in Thailand)o. ofYear)o. of)umber of People)umber of Houses

Flood Affected
Affected

DeadTotally

Partially

DamageDamageInjuredEvent Province

DamagedAgriculture
2
area (km )LossesValue(millionUSD)

1997

7

64

4,069,006

98

427

991

14,445

19,630.42

119.51

1998

12

65

1,649,752

8

3

1,022

11,201745.72

53.31

1999

9

69

4,560,517

53

30

967

10,272

4,861.07

43.18

2000

12

62

6,739,652

120

0

12,65033,724

16,544.93

313.53

2001

14

60

3,454,265

244

68

315

13,23946,614.02

114.57

2002

5

72

5,127,652

216

0

1,135

130,136

16,696.18

418.29

2003

17

66

1,882,017

44

10

18

10,3112,552.89

64.07

2004

12

59

2,324,441

283297

5,536

5,277.97

26.58

2005

1263

2,874,673

75

0275

5,697

2,722.32

186.95

2006

658

6,050,674

446

1,462

1,583

69,887

10,496.87

300.86

Data Source : Disaster Prevention and Mitigation Department, Thailand

Current stage of FHM in Thailand
Map types which are available in Thailand;
A: Location map not including elevation data
B: Location map including elevation data
C: Past inundation area of a single past flood
E: Past inundation area based on simulation
F: Inundation area of the design flood
G: Indication forecast by real time analysis.
D: Past inundation areas of several large floods with corresponding rainfall is not available

The outline of current situation of FHM in Thailand• Many FHM
FHM--related projects were developed in Thailand• FHM issue in Thailand is in the starting stage• The exact number of FHM
FHM--related project has not beencollected.

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Examples of good FHM-related projects
1. Development of River Basin Flood Management System by Optimal Reservoir Operation
and Real Time Flood Forecasting and Warning: A Case Study of Pasak River Basin.

Examples of good FHM-related projects
2. Flood hazard mapping of Lampang municipality.

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Examples of good FHM-related projects
3. Flood hazard mapping in Nan province of Thailand under the Nan river basin.

Study Area

JAXA sponsored project under JAXA-AIT Mini Project

Target/necessary stage of FHM in Thailand- At least the F-type FHM is necessary for the effective flood warning- The G-type FHM is the target for the important and complicated area

Institutional situation for making FHM- There are no laws in Thailand which indicate about FHM- )o organization is assigned to take responsibility in making FHM.

Hydrological/topographical data situation for making FHM- Hydrological data in all river basins of Thailand is available.
- The digital elevation model (DEM) throughout Thailand already Developedby the Land Development Department of Thailand.

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There are 1,127 hydrologicalstations in all river basinsthroughout Thailand.

TI) model generated from contour

Contour data generated from DEM

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Problems for making FHM in your country- The knowledge and technologies in Thailand are enough for making FHM.
- The only one problem of making FHM in Thailand is the policy.

Institutional situation for disseminating/use FHM- )o organizations and no laws related to dissemination of FHM.

Problems for disseminating/use of FHM in Thailand- The same as problems for making FHM

How to use FHM in Thailand- In Thailand, FHM is used for the officials to provide timely and reliableflood warning and flood information to the people so that they can evacuate
on time.

Conclusions- Flood is the natural phenomena. It exists and still exists.
- Structural measures are still important for flood mitigation.
- )on-structural measures are also important to support theeffectiveness of structural measures and to cover the cycle of flood
management system.
- Problems on making and dissemination of FHM exist for us tobe overcome not for giving up.

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Thank You7