Proposal Report
On“Flood Hazard Mapping Projectin
Yan Ta Khao Distric under Trang Province
Thailand”

Prepared By
Piriya UraiwongDepartment of Water ResourceThailand

FLOOD HAZARD MAPPING TRAINING COURSE
JFY 2008

1. Background
Southern part of Thailand situates in a Tropical Monsoon region whichflooding is not uncommon when heavy rain storm takes place every year.
At least 4,000 to 6,000 million bahts (160-200 million US dollars) werespent by the government to relief suffering from flood utilizing both
structural and non-structural counter measure. Protection from floodusing structural measure is one of the “public assistance” efforts in
disaster prevention to improve disaster preparedness at normal time
(Kamei, 2008). In order to reduce damage caused by flood, non-structural
measures such as preparing hazard maps and providing disaster
information must be promoted in an integral manner. Flood hazard map
can be effective tool to promote non-structural measure, and it should becreated base on the viewpoint of residents and should be displayed forresidents to understand easily and quickly.
Flood hazard map refer to a map which is prepared primarily to prevent
human damage by providing residents with inundation related
information, such as levee braces and flood occurrences, and evacuation inan easy to understand way. A flood hazard map must provide informationof specified inundation risk area and evacuation information (MLIT,2005).

2. Outline of Trang Province
The target area is Trang province which is the one of the southern
provinces (changwat) of Thailand, at the western shore of the Malay
Peninsula to the Andaman Sea. Neighboring provinces are (from northclockwise) Krabi, Nakhon Si Thammarat, Phatthalung and Satun.
Trang province has an area of approximately 5,000 square km.
The province is located on the coast of the Andaman Sea, and contains 46islands together with the mainland area. There are only few plains, andmost of the area is hills. The Khao Luang and the Banthat mountain
range are the sources of the two main rivers of the province, the Trang
River and the Palian River.
It has along western coastline of about 119 kilometres. The province
consists of an archipelago in the Andaman Sea with over 46 islands. Of
these, 12 are in Amphoe Kantang, 13 in Amphoe Palian and 21 in Amphoe
Sikao. The best time for sea travel is during October to May. Situatedalong the Andaman coast, Trang province is home to innumerable
beautiful islands, while the mountainous eastern region is home todramatic waterfalls, caves and pristine jungle. Between the mountains
and the coast are extensive plantations of rubber.

Fig 1: Map of Trang province
MonthAvg(°F)

Jan Feb Mar Apr May Jun Jul

high°C 323435
3432
3131(91) (94) (96) (94) (91) (89) (88)

Avg low temperature °C 21(70)(°F)
Precipitation
centimeters(inches)

21222323
23
23(71) (72) (74) (75) (74) (74)

AugSepOct

Nov Dec Year

31(88)

31(88)

31(88)

30
3132(87) (88) (90)25(77)

23(74)

22(73)

22
2122(72) (71) (73)

526
1924
24
25
29
32
32
24
11238(2.1) (1.0) (2.6) (7.5) (9.7) (9.8) (10.2) (11.6) (12.8) (12.7) (9.5) (4.4) (93.9)

Table 1: meteorological data
In December 2005, Flooding occurred in Trang province causing by heavy
rainfall from monsoon and depression from November to December. Fig 2shows accumulate rainfall in south part of Thailand from November toDecember. On December 18, there was maximum amount ofdischarge ,503.85 m3/sec, causing water level up to 6.54(msl). Result was
52 villages sunk under water.
Help from various organization such as red cross, rajaprachanukrau, inTrang went to flooding area, and donated food and water for victims fromflooding( 97,633 live bags, 200,000 bottles of drinking water, 138,218 setsof instant food , 673 sets of medication, grass and hay, and 13 flatboat )7/12/2005

9/12/2005

16/12/2005

17/12/2005

Fig 2: Accumulate rainfall from November to December in south partof Thailand

3. Action Plan toward Effective Flood Hazard Mapping
Action plan for flood hazard mapping can manipulate into two directions.
First is to introduce flood hazard map to line agencies who relate to deal
with flood disaster especially the department of disaster prevention andmitigation. According to Disaster Prevention and Mitigation Act, theDepartment of Disaster Prevention and Mitigation is assigned to lead
responsibility to coordinate flood prevention and mitigation. Further
national level on implementation of flood hazard mapping will be underconsideration of the Department of Disaster Prevention and Mitigation.
The Department of Water Resource is an agency for formulating
management plan, as well as monitoring, coordination andimplementation of water resources conservation and rehabilitation. It isalso an agency for flood control and mitigation for 25 river basins in thecountry. Stakeholders in the river basin will get involve for flood

mitigation in the basin management for officers in the regional offices ofthe department of water resource.
In order to make action plan toward flood hazard map for the Departmentof Water Resources, the effective development plan involves six stages
consisting of introduction of FHM, training, making the map, stakeholder’s participation, revising the map(optional) and production anddissemination maps (Figure 3-1).

Introduction of FHM

Training on FHM

Making FHM for the Target Area

Stake Holder’s Participation

Revised (Optional)

Production and Dissemination Maps

Fig 3-1: Development of Action Plan for Flood Hazard Mapping
3.1

Introduction of flood hazard map to officers for both main
office and regional offices of the Department of WaterResources will dedicate to organization knowledgemanagement. This effort can help individuals and groups toshare valuable organizational insights, to reduce redundantwork, to avoid reinventing the wheel per se, to reduce
training time for new employees, to retain intellectual capitalas employee’s turnover in an organization.

3.2

Training on flood hazard mapping will be hold either onheadquarter office or regional office. The training willcomprise of two methodologies; lecture and exercise. In order
to be able to make flood hazard map, the following items will
be carried out.

Object
123

Training Subject
General knowledge of FHM
Case example in Japan
Run-off analysis
GIS exercise (ArcGIS)
Inundation Analysis (HEC-RAS)
Flood Hazard Mapping Exercise
Group discussion

TypeLecture
Lecture/ExerciseDiscussion

3.3

After training on flood hazard mapping, the flood hazard mapof target area (pa-lean district) will be prepared by theregional office’s officer.

3.4

Since flood hazard map prepared by the Department of water
resource are based on technological knowledge, stake holder’sparticipation will be recognized to analyze and suggest forthe map. Coordination with River Basin Management Subcommittee, local government administration, and NGO in
introduction, inquiring comments, and requirements will beformulated.

3.5

Recommendation and comments from stake-holder’sparticipant will take into an account in order to revise orimprove flood hazard map of the target area.

3.6

The improved or revised version of flood hazard map will beproduced and disseminate to the local administrations inflood prone areas. According to budget allocation, it isdifficult to distribute flood hazard map to every household in
the hazardous area.

4. Schedule of Implementation
The project duration will take about 11 weeks as shown on table 4-1
ItemActivity
1123456234Time Frame (weeks)567891011

Introduction of Flood Hazard Map
Training on Flood Hazard Mapping
Making Flood Hazard Map for Target Area
Stake Holder's Participation
Revising Flood Hazard Map
Production and Dissemination Maps

Table 4-1: the project duration

Remark: Time frame can be flexible

5. Estimated Budget
Budget for this project will come from a fiscal budget of theDepartment of Water Resource or can be supported by other sources offunding. Total amount of budget is 437,000 Baht (about 12,850 $ US) as
shown in Table 5-1
Item1

Activity

Amount(Baht)

Introduction and Training for Flood Hazard Mapping
1.1 Per dium/ Accommodation/ Fares
1.2 Administration Running Cost
1.3 Travelling Cost
1.4 Material2

sum

114,200.00
100,000.00
80,000.00
5,000.00
299,200.00

sum

3,000.00
5,000.00
8,000.00

sum

10,000.00
40,000.00
5,000.00
55,000.00

sum

1,000.00
1,000.00

Making Flood Hazard Map on Target Area
2.1 Material
2.2 Administration Running Cost3Stake-holder’s participant
3.1 Administration Running Cost
3.2 Travelling Cost
3.3 Material

4Reviesing Flood Hazard Map
4.1 material

5Production and Dissemination Maps
5.1 Publishing Cost
5.2 Dissemination CostsumTotal

50,000.00
25,000.00
75,000.00
437,200.00

Table 5-1: Cost Estimation

6. Expected EffectivenessAccording to the action plan, expected results can be defined asfollow;
1. Promote Flood Hazard Mapping as a non-structural measure forflood disaster
2. Production and dissemination flood hazard maps for the target area
3. Increase awareness for flood disaster to community…………………………End……………………………