2009/2/23

The Project on Capacity Development
in Disaster Management in Thailand (2007-2008)

Working group II: Hazard map and GIS database

FLOOD&Mud Debris flow (Flash flood)

GIS 1D-Hazard mapping
NAKTAE PAITOON
Chief of Safety Standard Sub-Bureau
Disaster Prevention Measure Bureau
Department of Disaster Prevention and Mitigation
THAILANDThe regions of Thailand

NORTH-EASTERNNORTHERNEASTERN
CENTRAL
WESTERN

Bangkok

SOUTHERN

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Series of Hydrological Hazard Prone Area
Land slide Prone area

Mud &Debris Flow
Prone area

Flash Flood Prone area

Inundation (Flood)
Prone area

Flood and Mud & Debris flow Hazard MappingRequested Output
Because the Hazard Map should cover whole areaof Thailand, it must be evenly prepared regardlessthe available data at each location



The Hazard Map is not required the high accuracy
but necessary to be not far from the actual
historical data

The Hazard Map should be a base map for theCommunity Level Hazard Map



The Hazard Map should show the risk area ofresidential area2

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Flood and Mud & Debris flow Hazard MappingCriterion of Methodology
 Mud & Debris flow must occur during flash flood event More Easier water flowing into the area, More potential risk of mud&debris flow.
 For economy and lacking data problem solution,-The less of data would be used in the model.
-The model would be generalized, and not so high technology.
 The potential risk map would have enough scale for communitylevels.

GIS Analysis
1D-Flood Hazard
Mapping3

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GIS Analysis of FHM Flow Hazard mapping
Input DATA
: DEM Analyst Tools
Software: ArcGIS9with Spatial

DEM 30 metersResolution

Flood Potential Risk area Conceptual Idea

Inundation Level base on Topography42009/2/23

Flood Potential Conceptual Idea
Inundation area
Flood Water Surface
Flood plain

Flood plain

Left Bank Station

Right Bank Station
Main
ChannelNormal Water Surface• Flood Risk area due to water level

Flood Potential Conceptual Idea
Sec.4

Sec.3

Sec.2

Sec.1

Peak water level

Inundation Area
Channel
Sec.1

Sec.2

Sec.3

Sec.4

Peak water level
High water level(flow capacity)•Rise up water level on the surface and then capture the boundary of inundation5

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Topography• DATA: Digital Elevation Model (DEM-3D view)FHM Procedure• DATA: Stream Line6

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FHM Procedure• Corrected Stream line on plain area of DEM

FHM Procedure• Hydrological analysis :Lateral Watershed area analysis

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FHM Procedure• Rise up Water level of each Lateral watershed

FHM Procedure•

2D-Inundation area extraction of each water level8

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FHM Procedure•

2D Inundation area extraction of each water level

FHM Procedure•

Integrated Inundation area from each level to be Risk area9

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Community
Floodhazard
hazardMap
Map
TAMBOL Flood

Mud & Debris flow
&Flash flood
1D-Hazard mapping10

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Conceptual Idea of Mud & Debris Flow Analysis

Debris/Mud
FlowHazard
Mapping
GIS Analysisof Mud &Debris
Flow Hazardmapping
Target Stream: water shed >0.01km2
On steep slope > 15 degree
Methodology:
Modification of DEM
Extraction ofHigh Risk Stream
Distance Cost

Surface distanceSpread Cost

SlopeRiver Bank Cost

Slope &Aspect

2005,August,12-13 th.
Path Distance
Post event
Field
surveyfrom Risk
StreamAnalysis output

Classificationof Risk Level
Field checking11

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GIS Analysis of Mud & Debris Flow Hazard mapping

Pilot Area

Community Mud flow Hazard Map

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TAMBOL Mud flow Hazard Map

The Utilization IdeaofHazard map

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Many community waiting for Mud flow occurrence

The risk Community of Mud flow Prone area
Now it’s still waiting for Mud flow occurrence

Many community waiting for Mud flow occurrence

When will Mud flow be occurring ?
Mud & Debris Flow Prone Area
What can we do?

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Structural Measures Implemented

1. Local Road & Green Fence
Protection

3.Sedimentation pond2. Changing Flow direction &Reduce speed

water resource forDrought

Non-Structural Measure Implemented
Preparedness system
Risk Map for CBDRM Planning and Drill
Evacuation Direction &Zoning
Evacuation place15

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Non-Structural Measure Implemented
Awareness system
Information Education materials

Non-Structural Measure Implement
Regulation Measure
Registration of Risk area

Regulation of land use
Regulation of construction

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The implementation Idea ofJICA&DDPM FHM 1D-Modeling
For NEWS(Next step)

Flow chart of Near real time Early Warning &Evacuation mapping

Located Risk area
Located Rain gage Sta.

Hydrograph designed

inundation mapping

Real time Data

Evacuation mapping

Integrated map

Decision making by inhabitant17

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GIS Analysis of Mud & Debris Flow Early Warning System Mapping
Concept Idea of Near real time early warning & Evacuation Mapping
EW Information
Observation Data Rain gage sta.
And Early Warning Center
Evacuation place &Direction

150 mm.

Inundation Level relate with rainfall
Decision making by community
JICA&DDPM Phase II

Elapse Time for evacuation< Time of concentration.

Early Warning (EW) Information (Example)
Duration (hr.)
Line No.

12345100

300

250200150100150350

300250200150200400

350300250200250450400350

3002502 Hours of 300 mm. precipitation related with 150 inundation boundary line
and the time that high peak of flood would be occurred in this area after
rainstorm is equal to or less than the time of concentration.

*This is the time for evaluating the evacuation drill.

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Observation Data Temporary Rain gage Tools

2 litters Soft drink bottle

Paper Scale withClear adhesive tapeOily clay

Temporary Rain gage

Observation Data Rain gage instrument

Bamboo Rain gage
Installation19

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Require Tools and technology• Soft ware for easier design a lot of
Hydrograph (IFAS)• Soft ware for Flood simulation(HECRAS,etc.)

Capacity Building of DDPM
on Disaster managementwith Hazard Map(on going step)

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Organization of Hazard Map
GIS Database
DDPM
Head OfficeManual & Trainingof Trainer course
Training ofHazard Mapping
Advance GIS & Hazard
mapping Training

Inform & Updating data

DDPM
Regional OfficeAnalysis & Productionof digital hazard Map

Inform & Updating data
Compiling To
GIS data Format

ProvincialOffice

Basic GIS Training

Edited paper map by Field
Survey, Participation Check& Revise

Out put Paper
Community Hazard
Map
Community

Update of Community Hazard Map
GIS Database
Management

Update digital Map
DDPM
Head OfficeEvacuation
Route& placeorganization============================================================

update digital Map
DDPM
Out put Regional OfficeCommunity
update digital Map
level digital
Map
Update data in
Provincial
Digital format
OfficeOut put
Community paperpaper
CDBM
resulthazard
map print outMap &Local Information
CDBM
Verify &accumulate
Community

Information=================================================

Communication==============================

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Utilization of Hazard map for Post-DisasterTo Public
DDPM
Head Office
Digital Damage
Map

As Historical Data
GIS Database

DDPM
Regional Office

Emergency Response planning

Digital Damage
Map
ProvincialOffice
Hazard Map on Paper baseDisasterCompiling To
GIS data Format with basic GIS

Draw the Affected area on paper
Hazard Map (Field Survey& Data
from line Agencies&Hearing Residents)

Rapidly Response & Unique Public Information

GIS Database
Registration Number of risk area
Community Risk map
Historical Damage map
Early warning system information
Damage Assessment
Prevention & Mitigation Measure
etc.

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The implementation ofJICA&DDPM FHM Modeling2009-10 DDPM&MRC Project on
Land use Management Program

2008 Mea Khong River Flood in Thailand

Mea Khong River basin2008 Mea Khong Flood in Sri Chieng Mai
District, Nong Khai Province

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Sri Chieng Mai district Flood event from satellite image

Flood Duration (Week)

4w
3w
2w
1w
0:.25.5

1

1.5

2

2.5

3
Kilometers

Mea Khong 2008 flood events in Sri-Chieng-Mai, Nong Khai province,Thailand
Manila FHM seminar 16-20 Feb.2009
PAITOON NAKTAE, DDPM

Sri Chieng Mai district Flood event24

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Over Levee flow on 14-16 Sep.08

Over Levee flow on 14-16 Sep.08

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Erosion down stream

Damage from Erosion

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Damage from Erosion

FHM on Sri Chieng Mai district is ongoing for construction27

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THANK YOU

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